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-rw-r--r--src/urubu/spec/grammar/description.go71
-rw-r--r--src/urubu/spec/grammar/grammar.go160
-rw-r--r--src/urubu/spec/grammar/parser/clexspec.json1
-rw-r--r--src/urubu/spec/grammar/parser/lexer.go297
-rw-r--r--src/urubu/spec/grammar/parser/lexspec.json123
-rw-r--r--src/urubu/spec/grammar/parser/parser.go582
-rw-r--r--src/urubu/spec/grammar/parser/syntax_error.go45
-rw-r--r--src/urubu/spec/grammar/parser/vartan_lexer.go1339
-rw-r--r--src/urubu/spec/grammar/util.go21
-rw-r--r--src/urubu/spec/test/parser.go336
-rw-r--r--src/urubu/spec/test/tree-report.json1
-rw-r--r--src/urubu/spec/test/tree.json1
-rw-r--r--src/urubu/spec/test/tree.vartan87
-rw-r--r--src/urubu/spec/test/tree_lexer.go1024
-rw-r--r--src/urubu/spec/test/tree_parser.go716
-rw-r--r--src/urubu/spec/test/tree_semantic_action.go367
16 files changed, 5171 insertions, 0 deletions
diff --git a/src/urubu/spec/grammar/description.go b/src/urubu/spec/grammar/description.go
new file mode 100644
index 0000000..0d2a0b7
--- /dev/null
+++ b/src/urubu/spec/grammar/description.go
@@ -0,0 +1,71 @@
+package grammar
+
+type Terminal struct {
+ Number int `json:"number"`
+ Name string `json:"name"`
+ Pattern string `json:"pattern"`
+ Precedence int `json:"prec"`
+ Associativity string `json:"assoc"`
+}
+
+type NonTerminal struct {
+ Number int `json:"number"`
+ Name string `json:"name"`
+}
+
+type Production struct {
+ Number int `json:"number"`
+ LHS int `json:"lhs"`
+ RHS []int `json:"rhs"`
+ Precedence int `json:"prec"`
+ Associativity string `json:"assoc"`
+}
+
+type Item struct {
+ Production int `json:"production"`
+ Dot int `json:"dot"`
+}
+
+type Transition struct {
+ Symbol int `json:"symbol"`
+ State int `json:"state"`
+}
+
+type Reduce struct {
+ LookAhead []int `json:"look_ahead"`
+ Production int `json:"production"`
+}
+
+type SRConflict struct {
+ Symbol int `json:"symbol"`
+ State int `json:"state"`
+ Production int `json:"production"`
+ AdoptedState *int `json:"adopted_state"`
+ AdoptedProduction *int `json:"adopted_production"`
+ ResolvedBy int `json:"resolved_by"`
+}
+
+type RRConflict struct {
+ Symbol int `json:"symbol"`
+ Production1 int `json:"production_1"`
+ Production2 int `json:"production_2"`
+ AdoptedProduction int `json:"adopted_production"`
+ ResolvedBy int `json:"resolved_by"`
+}
+
+type State struct {
+ Number int `json:"number"`
+ Kernel []*Item `json:"kernel"`
+ Shift []*Transition `json:"shift"`
+ Reduce []*Reduce `json:"reduce"`
+ GoTo []*Transition `json:"goto"`
+ SRConflict []*SRConflict `json:"sr_conflict"`
+ RRConflict []*RRConflict `json:"rr_conflict"`
+}
+
+type Report struct {
+ Terminals []*Terminal `json:"terminals"`
+ NonTerminals []*NonTerminal `json:"non_terminals"`
+ Productions []*Production `json:"productions"`
+ States []*State `json:"states"`
+}
diff --git a/src/urubu/spec/grammar/grammar.go b/src/urubu/spec/grammar/grammar.go
new file mode 100644
index 0000000..bf1ea89
--- /dev/null
+++ b/src/urubu/spec/grammar/grammar.go
@@ -0,0 +1,160 @@
+package grammar
+
+import "strconv"
+
+type CompiledGrammar struct {
+ Name string `json:"name"`
+ Lexical *LexicalSpec `json:"lexical"`
+ Syntactic *SyntacticSpec `json:"syntactic"`
+ ASTAction *ASTAction `json:"ast_action"`
+}
+
+// StateID represents an ID of a state of a transition table.
+type StateID int
+
+const (
+ // StateIDNil represents an empty entry of a transition table.
+ // When the driver reads this value, it raises an error meaning lexical analysis failed.
+ StateIDNil = StateID(0)
+
+ // StateIDMin is the minimum value of the state ID. All valid state IDs are represented as
+ // sequential numbers starting from this value.
+ StateIDMin = StateID(1)
+)
+
+func (id StateID) Int() int {
+ return int(id)
+}
+
+// LexModeID represents an ID of a lex mode.
+type LexModeID int
+
+const (
+ LexModeIDNil = LexModeID(0)
+ LexModeIDDefault = LexModeID(1)
+)
+
+func (n LexModeID) String() string {
+ return strconv.Itoa(int(n))
+}
+
+func (n LexModeID) Int() int {
+ return int(n)
+}
+
+func (n LexModeID) IsNil() bool {
+ return n == LexModeIDNil
+}
+
+// LexModeName represents a name of a lex mode.
+type LexModeName string
+
+const (
+ LexModeNameNil = LexModeName("")
+ LexModeNameDefault = LexModeName("default")
+)
+
+func (m LexModeName) String() string {
+ return string(m)
+}
+
+// LexKindID represents an ID of a lexical kind and is unique across all modes.
+type LexKindID int
+
+const (
+ LexKindIDNil = LexKindID(0)
+ LexKindIDMin = LexKindID(1)
+)
+
+func (id LexKindID) Int() int {
+ return int(id)
+}
+
+// LexModeKindID represents an ID of a lexical kind and is unique within a mode.
+// Use LexKindID to identify a kind across all modes uniquely.
+type LexModeKindID int
+
+const (
+ LexModeKindIDNil = LexModeKindID(0)
+ LexModeKindIDMin = LexModeKindID(1)
+)
+
+func (id LexModeKindID) Int() int {
+ return int(id)
+}
+
+// LexKindName represents a name of a lexical kind.
+type LexKindName string
+
+const LexKindNameNil = LexKindName("")
+
+func (k LexKindName) String() string {
+ return string(k)
+}
+
+type RowDisplacementTable struct {
+ OriginalRowCount int `json:"original_row_count"`
+ OriginalColCount int `json:"original_col_count"`
+ EmptyValue StateID `json:"empty_value"`
+ Entries []StateID `json:"entries"`
+ Bounds []int `json:"bounds"`
+ RowDisplacement []int `json:"row_displacement"`
+}
+
+type UniqueEntriesTable struct {
+ UniqueEntries *RowDisplacementTable `json:"unique_entries,omitempty"`
+ UncompressedUniqueEntries []StateID `json:"uncompressed_unique_entries,omitempty"`
+ RowNums []int `json:"row_nums"`
+ OriginalRowCount int `json:"original_row_count"`
+ OriginalColCount int `json:"original_col_count"`
+ EmptyValue int `json:"empty_value"`
+}
+
+type TransitionTable struct {
+ InitialStateID StateID `json:"initial_state_id"`
+ AcceptingStates []LexModeKindID `json:"accepting_states"`
+ RowCount int `json:"row_count"`
+ ColCount int `json:"col_count"`
+ Transition *UniqueEntriesTable `json:"transition,omitempty"`
+ UncompressedTransition []StateID `json:"uncompressed_transition,omitempty"`
+}
+
+type CompiledLexModeSpec struct {
+ KindNames []LexKindName `json:"kind_names"`
+ Push []LexModeID `json:"push"`
+ Pop []int `json:"pop"`
+ DFA *TransitionTable `json:"dfa"`
+}
+
+type LexicalSpec struct {
+ InitialModeID LexModeID `json:"initial_mode_id"`
+ ModeNames []LexModeName `json:"mode_names"`
+ KindNames []LexKindName `json:"kind_names"`
+ KindIDs [][]LexKindID `json:"kind_ids"`
+ CompressionLevel int `json:"compression_level"`
+ Specs []*CompiledLexModeSpec `json:"specs"`
+}
+
+type SyntacticSpec struct {
+ Action []int `json:"action"`
+ GoTo []int `json:"goto"`
+ StateCount int `json:"state_count"`
+ InitialState int `json:"initial_state"`
+ StartProduction int `json:"start_production"`
+ LHSSymbols []int `json:"lhs_symbols"`
+ AlternativeSymbolCounts []int `json:"alternative_symbol_counts"`
+ Terminals []string `json:"terminals"`
+ TerminalCount int `json:"terminal_count"`
+ TerminalSkip []int `json:"terminal_skip"`
+ KindToTerminal []int `json:"kind_to_terminal"`
+ NonTerminals []string `json:"non_terminals"`
+ NonTerminalCount int `json:"non_terminal_count"`
+ EOFSymbol int `json:"eof_symbol"`
+ ErrorSymbol int `json:"error_symbol"`
+ ErrorTrapperStates []int `json:"error_trapper_states"`
+ RecoverProductions []int `json:"recover_productions"`
+}
+
+type ASTAction struct {
+ Entries [][]int `json:"entries"`
+}
diff --git a/src/urubu/spec/grammar/parser/clexspec.json b/src/urubu/spec/grammar/parser/clexspec.json
new file mode 100644
index 0000000..d0ed3d3
--- /dev/null
+++ b/src/urubu/spec/grammar/parser/clexspec.json
@@ -0,0 +1 @@
+{"name":"vartan","initial_mode_id":1,"mode_names":["","default","terminal","string_literal"],"kind_names":["","white_space","newline","line_comment","kw_fragment","identifier","terminal_open","string_literal_open","colon","or","semicolon","label_marker","expansion","directive_marker","ordered_symbol_marker","l_paren","r_paren","pattern","escape_symbol","terminal_close","char_seq","string_literal_close"],"kind_ids":[null,[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16],[0,17,18,19],[0,20,21]],"compression_level":2,"specs":[null,{"kind_names":["","white_space","newline","line_comment","kw_fragment","identifier","terminal_open","string_literal_open","colon","or","semicolon","label_marker","expansion","directive_marker","ordered_symbol_marker","l_paren","r_paren"],"push":[0,0,0,0,0,0,2,3,0,0,0,0,0,0,0,0,0],"pop":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"dfa":{"initial_state_id":1,"accepting_states":[0,0,1,2,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,5,5,5,5,5,5,4,5,0,0,2,6,7,8,9,10,11,12,13,14,15,16],"row_count":47,"col_count":256,"transition":{"unique_entries":{"original_row_count":27,"original_col_count":256,"empty_value":0,"entries":[5,5,5,5,5,5,5,5,5,5,0,5,5,0,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,9,9,9,9,9,9,9,9,9,9,9,9,11,13,13,15,18,18,18,21,2,35,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,36,43,44,0,0,37,45,46,0,0,0,0,33,4,32,32,32,32,32,32,32,32,32,32,38,40,0,0,0,0,41,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,24,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,39,0,0,0,0,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,25,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,26,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,32,27,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,32,32,32,32,32,32,32,28,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,29,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,32,32,32,32,32,32,32,32,30,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,31,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,32,0,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,16,16,16,16,16,16,1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,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,-1,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,-1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,-1,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,-1,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1],"row_displacement":[0,0,246,1194,362,1258,426,1114,490,554,618,1355,682,245,1259,746,1323,810,1162,874,938,1002,1371,1066]},"row_nums":[0,1,2,3,2,4,2,5,2,6,2,7,8,2,9,10,2,11,12,2,13,2,14,2,15,2,16,2,17,2,18,19,2,20,21,2,22,23,2,0],"original_row_count":40,"original_col_count":256,"empty_value":0}}}]}
diff --git a/src/urubu/spec/grammar/parser/lexer.go b/src/urubu/spec/grammar/parser/lexer.go
new file mode 100644
index 0000000..bd8a24f
--- /dev/null
+++ b/src/urubu/spec/grammar/parser/lexer.go
@@ -0,0 +1,297 @@
+//go:generate maleeni compile lexspec.json -o clexspec.json
+//go:generate maleeni-go clexspec.json --package parser
+
+package parser
+
+import (
+ _ "embed"
+ "fmt"
+ "io"
+ "regexp"
+ "strings"
+
+ verr "urubu/error"
+)
+
+type tokenKind string
+
+const (
+ tokenKindKWFragment = tokenKind("fragment")
+ tokenKindID = tokenKind("id")
+ tokenKindTerminalPattern = tokenKind("terminal pattern")
+ tokenKindStringLiteral = tokenKind("string")
+ tokenKindColon = tokenKind(":")
+ tokenKindOr = tokenKind("|")
+ tokenKindSemicolon = tokenKind(";")
+ tokenKindLabelMarker = tokenKind("@")
+ tokenKindDirectiveMarker = tokenKind("#")
+ tokenKindExpantion = tokenKind("...")
+ tokenKindOrderedSymbolMarker = tokenKind("$")
+ tokenKindLParen = tokenKind("(")
+ tokenKindRParen = tokenKind(")")
+ tokenKindNewline = tokenKind("newline")
+ tokenKindEOF = tokenKind("eof")
+ tokenKindInvalid = tokenKind("invalid")
+)
+
+var (
+ reIDChar = regexp.MustCompile(`^[0-9a-z_]+$`)
+ reIDInvalidDigitsPos = regexp.MustCompile(`^[0-9]`)
+)
+
+type Position struct {
+ Row int
+ Col int
+}
+
+func newPosition(row, col int) Position {
+ return Position{
+ Row: row,
+ Col: col,
+ }
+}
+
+type token struct {
+ kind tokenKind
+ text string
+ pos Position
+}
+
+func newSymbolToken(kind tokenKind, pos Position) *token {
+ return &token{
+ kind: kind,
+ pos: pos,
+ }
+}
+
+func newIDToken(text string, pos Position) *token {
+ return &token{
+ kind: tokenKindID,
+ text: text,
+ pos: pos,
+ }
+}
+
+func newTerminalPatternToken(text string, pos Position) *token {
+ return &token{
+ kind: tokenKindTerminalPattern,
+ text: text,
+ pos: pos,
+ }
+}
+
+func newStringLiteralToken(text string, pos Position) *token {
+ return &token{
+ kind: tokenKindStringLiteral,
+ text: text,
+ pos: pos,
+ }
+}
+
+func newEOFToken() *token {
+ return &token{
+ kind: tokenKindEOF,
+ }
+}
+
+func newInvalidToken(text string, pos Position) *token {
+ return &token{
+ kind: tokenKindInvalid,
+ text: text,
+ pos: pos,
+ }
+}
+
+type lexer struct {
+ d *Lexer
+ buf *token
+}
+
+func newLexer(src io.Reader) (*lexer, error) {
+ d, err := NewLexer(NewLexSpec(), src)
+ if err != nil {
+ return nil, err
+ }
+ return &lexer{
+ d: d,
+ }, nil
+}
+
+func (l *lexer) next() (*token, error) {
+ if l.buf != nil {
+ tok := l.buf
+ l.buf = nil
+ return tok, nil
+ }
+
+ var newline *token
+ for {
+ tok, err := l.lexAndSkipWSs()
+ if err != nil {
+ return nil, err
+ }
+ if tok.kind == tokenKindNewline {
+ newline = tok
+ continue
+ }
+
+ if newline != nil {
+ l.buf = tok
+ return newline, nil
+ }
+ return tok, nil
+ }
+}
+
+func (l *lexer) lexAndSkipWSs() (*token, error) {
+ var tok *Token
+ for {
+ var err error
+ tok, err = l.d.Next()
+ if err != nil {
+ return nil, err
+ }
+ if tok.Invalid {
+ return newInvalidToken(string(tok.Lexeme), newPosition(tok.Row+1, tok.Col+1)), nil
+ }
+ if tok.EOF {
+ return newEOFToken(), nil
+ }
+ switch tok.KindID {
+ case KindIDWhiteSpace:
+ continue
+ case KindIDLineComment:
+ continue
+ }
+
+ break
+ }
+
+ switch tok.KindID {
+ case KindIDNewline:
+ return newSymbolToken(tokenKindNewline, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDKwFragment:
+ return newSymbolToken(tokenKindKWFragment, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDIdentifier:
+ if !reIDChar.Match(tok.Lexeme) {
+ return nil, &verr.SpecError{
+ Cause: synErrIDInvalidChar,
+ Detail: string(tok.Lexeme),
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ if strings.HasPrefix(string(tok.Lexeme), "_") || strings.HasSuffix(string(tok.Lexeme), "_") {
+ return nil, &verr.SpecError{
+ Cause: synErrIDInvalidUnderscorePos,
+ Detail: string(tok.Lexeme),
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ if strings.Contains(string(tok.Lexeme), "__") {
+ return nil, &verr.SpecError{
+ Cause: synErrIDConsecutiveUnderscores,
+ Detail: string(tok.Lexeme),
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ if reIDInvalidDigitsPos.Match(tok.Lexeme) {
+ return nil, &verr.SpecError{
+ Cause: synErrIDInvalidDigitsPos,
+ Detail: string(tok.Lexeme),
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ return newIDToken(string(tok.Lexeme), newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDTerminalOpen:
+ var b strings.Builder
+ for {
+ tok, err := l.d.Next()
+ if err != nil {
+ return nil, err
+ }
+ if tok.EOF {
+ return nil, &verr.SpecError{
+ Cause: synErrUnclosedTerminal,
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ switch tok.KindID {
+ case KindIDPattern:
+ // The escape sequences in a pattern string are interpreted by the lexer, except for the \".
+ // We must interpret the \" before passing them to the lexer because they are delimiters for
+ // the pattern strings.
+ fmt.Fprint(&b, strings.ReplaceAll(string(tok.Lexeme), `\"`, `"`))
+ case KindIDEscapeSymbol:
+ return nil, &verr.SpecError{
+ Cause: synErrIncompletedEscSeq,
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ case KindIDTerminalClose:
+ pat := b.String()
+ if pat == "" {
+ return nil, &verr.SpecError{
+ Cause: synErrEmptyPattern,
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ return newTerminalPatternToken(pat, newPosition(tok.Row+1, tok.Col+1)), nil
+ }
+ }
+ case KindIDStringLiteralOpen:
+ var b strings.Builder
+ for {
+ tok, err := l.d.Next()
+ if err != nil {
+ return nil, err
+ }
+ if tok.EOF {
+ return nil, &verr.SpecError{
+ Cause: synErrUnclosedString,
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ switch tok.KindID {
+ case KindIDCharSeq:
+ fmt.Fprint(&b, string(tok.Lexeme))
+ case KindIDStringLiteralClose:
+ str := b.String()
+ if str == "" {
+ return nil, &verr.SpecError{
+ Cause: synErrEmptyString,
+ Row: tok.Row + 1,
+ Col: tok.Col + 1,
+ }
+ }
+ return newStringLiteralToken(str, newPosition(tok.Row+1, tok.Col+1)), nil
+ }
+ }
+ case KindIDColon:
+ return newSymbolToken(tokenKindColon, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDOr:
+ return newSymbolToken(tokenKindOr, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDSemicolon:
+ return newSymbolToken(tokenKindSemicolon, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDLabelMarker:
+ return newSymbolToken(tokenKindLabelMarker, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDDirectiveMarker:
+ return newSymbolToken(tokenKindDirectiveMarker, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDExpansion:
+ return newSymbolToken(tokenKindExpantion, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDOrderedSymbolMarker:
+ return newSymbolToken(tokenKindOrderedSymbolMarker, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDLParen:
+ return newSymbolToken(tokenKindLParen, newPosition(tok.Row+1, tok.Col+1)), nil
+ case KindIDRParen:
+ return newSymbolToken(tokenKindRParen, newPosition(tok.Row+1, tok.Col+1)), nil
+ default:
+ return newInvalidToken(string(tok.Lexeme), newPosition(tok.Row+1, tok.Col+1)), nil
+ }
+}
diff --git a/src/urubu/spec/grammar/parser/lexspec.json b/src/urubu/spec/grammar/parser/lexspec.json
new file mode 100644
index 0000000..caf1f0e
--- /dev/null
+++ b/src/urubu/spec/grammar/parser/lexspec.json
@@ -0,0 +1,123 @@
+{
+ "name": "vartan",
+ "entries": [
+ {
+ "fragment": true,
+ "kind": "lf",
+ "pattern": "\\u{000A}"
+ },
+ {
+ "fragment": true,
+ "kind": "cr",
+ "pattern": "\\u{000D}"
+ },
+ {
+ "fragment": true,
+ "kind": "ht",
+ "pattern": "\\u{0009}"
+ },
+ {
+ "fragment": true,
+ "kind": "sp",
+ "pattern": "\\u{0020}"
+ },
+ {
+ "fragment": true,
+ "kind": "newline",
+ "pattern": "\\f{lf}|\\f{cr}|\\f{cr}\\f{lf}"
+ },
+ {
+ "kind": "white_space",
+ "pattern": "(\\f{ht}|\\f{sp})+"
+ },
+ {
+ "kind": "newline",
+ "pattern": "\\f{newline}"
+ },
+ {
+ "kind": "line_comment",
+ "pattern": "//[^\\u{000A}\\u{000D}]*"
+ },
+ {
+ "kind": "kw_fragment",
+ "pattern": "fragment"
+ },
+ {
+ "kind": "identifier",
+ "pattern": "[0-9A-Za-z_]+"
+ },
+ {
+ "kind": "terminal_open",
+ "pattern": "\"",
+ "push": "terminal"
+ },
+ {
+ "modes": ["terminal"],
+ "kind": "pattern",
+ "pattern": "([^\"\\\\]|\\\\.)+"
+ },
+ {
+ "modes": ["terminal"],
+ "kind": "escape_symbol",
+ "pattern": "\\\\"
+ },
+ {
+ "modes": ["terminal"],
+ "kind": "terminal_close",
+ "pattern": "\"",
+ "pop": true
+ },
+ {
+ "kind": "string_literal_open",
+ "pattern": "'",
+ "push": "string_literal"
+ },
+ {
+ "modes": ["string_literal"],
+ "kind": "char_seq",
+ "pattern": "[^']+"
+ },
+ {
+ "modes": ["string_literal"],
+ "kind": "string_literal_close",
+ "pattern": "'",
+ "pop": true
+ },
+ {
+ "kind": "colon",
+ "pattern": ":"
+ },
+ {
+ "kind": "or",
+ "pattern": "\\|"
+ },
+ {
+ "kind": "semicolon",
+ "pattern": ";"
+ },
+ {
+ "kind": "label_marker",
+ "pattern": "@"
+ },
+ {
+ "kind": "expansion",
+ "pattern": "\\.\\.\\."
+ },
+ {
+ "kind": "directive_marker",
+ "pattern": "#"
+ },
+ {
+ "kind": "ordered_symbol_marker",
+ "pattern": "$"
+ },
+ {
+ "kind": "l_paren",
+ "pattern": "\\("
+ },
+ {
+ "kind": "r_paren",
+ "pattern": "\\)"
+ }
+ ]
+}
diff --git a/src/urubu/spec/grammar/parser/parser.go b/src/urubu/spec/grammar/parser/parser.go
new file mode 100644
index 0000000..b604074
--- /dev/null
+++ b/src/urubu/spec/grammar/parser/parser.go
@@ -0,0 +1,582 @@
+package parser
+
+import (
+ "fmt"
+ "io"
+
+ verr "urubu/error"
+ spec "urubu/spec/grammar"
+)
+
+type RootNode struct {
+ Directives []*DirectiveNode
+ Productions []*ProductionNode
+ LexProductions []*ProductionNode
+ Fragments []*FragmentNode
+}
+
+type ProductionNode struct {
+ Directives []*DirectiveNode
+ LHS string
+ RHS []*AlternativeNode
+ Pos Position
+}
+
+func (n *ProductionNode) isLexical() bool {
+ if len(n.RHS) == 1 && len(n.RHS[0].Elements) == 1 && n.RHS[0].Elements[0].Pattern != "" {
+ return true
+ }
+ return false
+}
+
+type AlternativeNode struct {
+ Elements []*ElementNode
+ Directives []*DirectiveNode
+ Pos Position
+}
+
+type ElementNode struct {
+ ID string
+ Pattern string
+ Label *LabelNode
+ Literally bool
+ Pos Position
+}
+
+type LabelNode struct {
+ Name string
+ Pos Position
+}
+
+type DirectiveNode struct {
+ Name string
+ Parameters []*ParameterNode
+ Pos Position
+}
+
+type ParameterNode struct {
+ ID string
+ Pattern string
+ String string
+ OrderedSymbol string
+ Group []*DirectiveNode
+ Expansion bool
+ Pos Position
+}
+
+type FragmentNode struct {
+ LHS string
+ RHS string
+ Pos Position
+}
+
+func raiseSyntaxError(row int, synErr *SyntaxError) {
+ panic(&verr.SpecError{
+ Cause: synErr,
+ Row: row,
+ })
+}
+
+func raiseSyntaxErrorWithDetail(row int, synErr *SyntaxError, detail string) {
+ panic(&verr.SpecError{
+ Cause: synErr,
+ Detail: detail,
+ Row: row,
+ })
+}
+
+func Parse(src io.Reader) (*RootNode, error) {
+ p, err := newParser(src)
+ if err != nil {
+ return nil, err
+ }
+
+ return p.parse()
+}
+
+type parser struct {
+ lex *lexer
+ peekedTok *token
+ lastTok *token
+ errs verr.SpecErrors
+
+ // A token position that the parser read at last.
+ // It is used as additional information in error messages.
+ pos Position
+}
+
+func newParser(src io.Reader) (*parser, error) {
+ lex, err := newLexer(src)
+ if err != nil {
+ return nil, err
+ }
+ return &parser{
+ lex: lex,
+ }, nil
+}
+
+func (p *parser) parse() (root *RootNode, retErr error) {
+ root = p.parseRoot()
+ if len(p.errs) > 0 {
+ return nil, p.errs
+ }
+
+ return root, nil
+}
+
+func (p *parser) parseRoot() *RootNode {
+ defer func() {
+ err := recover()
+ if err != nil {
+ specErr, ok := err.(*verr.SpecError)
+ if !ok {
+ panic(fmt.Errorf("an unexpected error occurred: %v", err))
+ }
+ p.errs = append(p.errs, specErr)
+ }
+ }()
+
+ var dirs []*DirectiveNode
+ var prods []*ProductionNode
+ var lexProds []*ProductionNode
+ var fragments []*FragmentNode
+ for {
+ dir := p.parseTopLevelDirective()
+ if dir != nil {
+ dirs = append(dirs, dir)
+ continue
+ }
+
+ fragment := p.parseFragment()
+ if fragment != nil {
+ fragments = append(fragments, fragment)
+ continue
+ }
+
+ prod := p.parseProduction()
+ if prod != nil {
+ if prod.isLexical() {
+ lexProds = append(lexProds, prod)
+ } else {
+ prods = append(prods, prod)
+ }
+ continue
+ }
+
+ if p.consume(tokenKindEOF) {
+ break
+ }
+ }
+
+ return &RootNode{
+ Directives: dirs,
+ Productions: prods,
+ LexProductions: lexProds,
+ Fragments: fragments,
+ }
+}
+
+func (p *parser) parseTopLevelDirective() *DirectiveNode {
+ defer func() {
+ err := recover()
+ if err == nil {
+ return
+ }
+
+ specErr, ok := err.(*verr.SpecError)
+ if !ok {
+ panic(err)
+ }
+
+ p.errs = append(p.errs, specErr)
+ p.skipOverTo(tokenKindSemicolon)
+ }()
+
+ dir := p.parseDirective()
+ if dir == nil {
+ return nil
+ }
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindSemicolon) {
+ raiseSyntaxError(p.pos.Row, synErrTopLevelDirNoSemicolon)
+ }
+
+ return dir
+}
+
+func (p *parser) parseFragment() *FragmentNode {
+ defer func() {
+ err := recover()
+ if err == nil {
+ return
+ }
+
+ specErr, ok := err.(*verr.SpecError)
+ if !ok {
+ panic(err)
+ }
+
+ p.errs = append(p.errs, specErr)
+ p.skipOverTo(tokenKindSemicolon)
+ }()
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindKWFragment) {
+ return nil
+ }
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(p.pos.Row, synErrNoProductionName)
+ }
+ lhs := p.lastTok.text
+ lhsPos := p.lastTok.pos
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindColon) {
+ raiseSyntaxError(p.pos.Row, synErrNoColon)
+ }
+
+ var rhs string
+ switch {
+ case p.consume(tokenKindTerminalPattern):
+ rhs = p.lastTok.text
+ case p.consume(tokenKindStringLiteral):
+ rhs = spec.EscapePattern(p.lastTok.text)
+ default:
+ raiseSyntaxError(p.pos.Row, synErrFragmentNoPattern)
+ }
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindSemicolon) {
+ raiseSyntaxError(p.pos.Row, synErrNoSemicolon)
+ }
+
+ if !p.consume(tokenKindNewline) {
+ if !p.consume(tokenKindEOF) {
+ raiseSyntaxError(p.pos.Row, synErrSemicolonNoNewline)
+ }
+ }
+
+ return &FragmentNode{
+ LHS: lhs,
+ RHS: rhs,
+ Pos: lhsPos,
+ }
+}
+
+func (p *parser) parseProduction() *ProductionNode {
+ defer func() {
+ err := recover()
+ if err == nil {
+ return
+ }
+
+ specErr, ok := err.(*verr.SpecError)
+ if !ok {
+ panic(err)
+ }
+
+ p.errs = append(p.errs, specErr)
+ p.skipOverTo(tokenKindSemicolon)
+ }()
+
+ p.consume(tokenKindNewline)
+
+ if p.consume(tokenKindEOF) {
+ return nil
+ }
+
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(p.pos.Row, synErrNoProductionName)
+ }
+ lhs := p.lastTok.text
+ lhsPos := p.lastTok.pos
+
+ var dirs []*DirectiveNode
+ for {
+ dir := p.parseDirective()
+ if dir == nil {
+ break
+ }
+ dirs = append(dirs, dir)
+ }
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindColon) {
+ raiseSyntaxError(p.pos.Row, synErrNoColon)
+ }
+
+ alt := p.parseAlternative()
+ rhs := []*AlternativeNode{alt}
+ for {
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindOr) {
+ break
+ }
+ alt := p.parseAlternative()
+ rhs = append(rhs, alt)
+ }
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindSemicolon) {
+ raiseSyntaxError(p.pos.Row, synErrNoSemicolon)
+ }
+
+ if !p.consume(tokenKindNewline) {
+ if !p.consume(tokenKindEOF) {
+ raiseSyntaxError(p.pos.Row, synErrSemicolonNoNewline)
+ }
+ }
+
+ prod := &ProductionNode{
+ Directives: dirs,
+ LHS: lhs,
+ RHS: rhs,
+ Pos: lhsPos,
+ }
+
+ // Vartan's driver must provide a user with the names of expected tokens when a syntax error occurs.
+ // However, if a pattern appears directly in an alternative, Vartan's compiler cannot assign an appropriate
+ // name to the pattern. Therefore, this code prohibits alternatives from containing patterns.
+ if !prod.isLexical() {
+ for _, alt := range prod.RHS {
+ for _, elem := range alt.Elements {
+ if elem.Pattern != "" {
+ raiseSyntaxError(elem.Pos.Row, synErrPatternInAlt)
+ }
+ }
+ }
+ }
+
+ return prod
+}
+
+func (p *parser) parseAlternative() *AlternativeNode {
+ elems := []*ElementNode{}
+ for {
+ elem := p.parseElement()
+ if elem == nil {
+ break
+ }
+ elems = append(elems, elem)
+ }
+
+ // When a length of an alternative is zero, we cannot set a position.
+ var firstElemPos Position
+ if len(elems) > 0 {
+ firstElemPos = elems[0].Pos
+ }
+
+ var dirs []*DirectiveNode
+ for {
+ dir := p.parseDirective()
+ if dir == nil {
+ break
+ }
+ dirs = append(dirs, dir)
+ }
+
+ return &AlternativeNode{
+ Elements: elems,
+ Directives: dirs,
+ Pos: firstElemPos,
+ }
+}
+
+func (p *parser) parseElement() *ElementNode {
+ var elem *ElementNode
+ switch {
+ case p.consume(tokenKindID):
+ elem = &ElementNode{
+ ID: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ case p.consume(tokenKindTerminalPattern):
+ elem = &ElementNode{
+ Pattern: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ case p.consume(tokenKindStringLiteral):
+ elem = &ElementNode{
+ Pattern: p.lastTok.text,
+ Literally: true,
+ Pos: p.lastTok.pos,
+ }
+ default:
+ if p.consume(tokenKindLabelMarker) {
+ raiseSyntaxError(p.pos.Row, synErrLabelWithNoSymbol)
+ }
+ return nil
+ }
+ if p.consume(tokenKindLabelMarker) {
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(p.pos.Row, synErrNoLabel)
+ }
+ elem.Label = &LabelNode{
+ Name: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ }
+ return elem
+}
+
+func (p *parser) parseDirective() *DirectiveNode {
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindDirectiveMarker) {
+ return nil
+ }
+ dirPos := p.lastTok.pos
+
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(p.pos.Row, synErrNoDirectiveName)
+ }
+ name := p.lastTok.text
+
+ var params []*ParameterNode
+ for {
+ param := p.parseParameter()
+ if param == nil {
+ break
+ }
+ params = append(params, param)
+ }
+
+ return &DirectiveNode{
+ Name: name,
+ Parameters: params,
+ Pos: dirPos,
+ }
+}
+
+func (p *parser) parseParameter() *ParameterNode {
+ var param *ParameterNode
+ switch {
+ case p.consume(tokenKindID):
+ param = &ParameterNode{
+ ID: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ case p.consume(tokenKindTerminalPattern):
+ param = &ParameterNode{
+ Pattern: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ case p.consume(tokenKindStringLiteral):
+ param = &ParameterNode{
+ String: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ case p.consume(tokenKindOrderedSymbolMarker):
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(p.pos.Row, synErrNoOrderedSymbolName)
+ }
+ param = &ParameterNode{
+ OrderedSymbol: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ }
+ case p.consume(tokenKindLParen):
+ pos := p.lastTok.pos
+ var g []*DirectiveNode
+ for {
+ dir := p.parseDirective()
+ if dir == nil {
+ break
+ }
+ g = append(g, dir)
+ }
+ if !p.consume(tokenKindRParen) {
+ raiseSyntaxError(p.pos.Row, synErrUnclosedDirGroup)
+ }
+ if len(g) == 0 {
+ // Set an empty slice representing an empty directive group to distinguish between the following two cases.
+ //
+ // - #prec (); // vartan allows this case.
+ // - #prec; // This case will raise an error.
+ g = []*DirectiveNode{}
+ }
+ param = &ParameterNode{
+ Group: g,
+ Pos: pos,
+ }
+ }
+ if p.consume(tokenKindExpantion) {
+ switch {
+ case param == nil:
+ raiseSyntaxError(p.pos.Row, synErrStrayExpOp)
+ case param.ID == "":
+ raiseSyntaxError(p.pos.Row, synErrInvalidExpOperand)
+ }
+ param.Expansion = true
+ }
+ return param
+}
+
+func (p *parser) consume(expected tokenKind) bool {
+ var tok *token
+ var err error
+ if p.peekedTok != nil {
+ tok = p.peekedTok
+ p.peekedTok = nil
+ } else {
+ tok, err = p.lex.next()
+ if err != nil {
+ panic(err)
+ }
+ }
+ p.pos = tok.pos
+ if tok.kind == tokenKindInvalid {
+ raiseSyntaxErrorWithDetail(p.pos.Row, synErrInvalidToken, tok.text)
+ }
+ if tok.kind == expected {
+ p.lastTok = tok
+ return true
+ }
+ p.peekedTok = tok
+
+ return false
+}
+
+func (p *parser) skip() {
+ var tok *token
+ var err error
+ for {
+ if p.peekedTok != nil {
+ tok = p.peekedTok
+ p.peekedTok = nil
+ } else {
+ tok, err = p.lex.next()
+ if err != nil {
+ p.errs = append(p.errs, &verr.SpecError{
+ Cause: err,
+ Row: p.pos.Row,
+ })
+ continue
+ }
+ }
+
+ break
+ }
+
+ p.lastTok = tok
+ p.pos = tok.pos
+}
+
+func (p *parser) skipOverTo(kind tokenKind) {
+ for {
+ if p.consume(kind) || p.consume(tokenKindEOF) {
+ return
+ }
+ p.skip()
+ }
+}
diff --git a/src/urubu/spec/grammar/parser/syntax_error.go b/src/urubu/spec/grammar/parser/syntax_error.go
new file mode 100644
index 0000000..719fb94
--- /dev/null
+++ b/src/urubu/spec/grammar/parser/syntax_error.go
@@ -0,0 +1,45 @@
+package parser
+
+type SyntaxError struct {
+ message string
+}
+
+func newSyntaxError(message string) *SyntaxError {
+ return &SyntaxError{
+ message: message,
+ }
+}
+
+func (e *SyntaxError) Error() string {
+ return e.message
+}
+
+var (
+ // lexical errors
+ synErrIDInvalidChar = newSyntaxError("an identifier can contain only the lower-case letter, the digits, and the underscore")
+ synErrIDInvalidUnderscorePos = newSyntaxError("the underscore cannot be placed at the beginning or end of an identifier")
+ synErrIDConsecutiveUnderscores = newSyntaxError("the underscore cannot be placed consecutively")
+ synErrIDInvalidDigitsPos = newSyntaxError("the digits cannot be placed at the biginning of an identifier")
+ synErrUnclosedTerminal = newSyntaxError("unclosed terminal")
+ synErrUnclosedString = newSyntaxError("unclosed string")
+ synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following a backslash")
+ synErrEmptyPattern = newSyntaxError("a pattern must include at least one character")
+ synErrEmptyString = newSyntaxError("a string must include at least one character")
+
+ // syntax errors
+ synErrInvalidToken = newSyntaxError("invalid token")
+ synErrTopLevelDirNoSemicolon = newSyntaxError("a top-level directive must be followed by ;")
+ synErrNoProductionName = newSyntaxError("a production name is missing")
+ synErrNoColon = newSyntaxError("the colon must precede alternatives")
+ synErrNoSemicolon = newSyntaxError("the semicolon is missing at the last of an alternative")
+ synErrLabelWithNoSymbol = newSyntaxError("a label must follow a symbol")
+ synErrNoLabel = newSyntaxError("an identifier that represents a label is missing after the label marker @")
+ synErrNoDirectiveName = newSyntaxError("a directive needs a name")
+ synErrNoOrderedSymbolName = newSyntaxError("an ordered symbol name is missing")
+ synErrUnclosedDirGroup = newSyntaxError("a directive group must be closed by )")
+ synErrPatternInAlt = newSyntaxError("a pattern literal cannot appear directly in an alternative. instead, please define a terminal symbol with the pattern literal")
+ synErrStrayExpOp = newSyntaxError("an expansion operator ... must be preceded by an identifier")
+ synErrInvalidExpOperand = newSyntaxError("an expansion operator ... can be applied to only an identifier")
+ synErrSemicolonNoNewline = newSyntaxError("a semicolon must be followed by a newline")
+ synErrFragmentNoPattern = newSyntaxError("a fragment needs one pattern element")
+)
diff --git a/src/urubu/spec/grammar/parser/vartan_lexer.go b/src/urubu/spec/grammar/parser/vartan_lexer.go
new file mode 100644
index 0000000..76ddfde
--- /dev/null
+++ b/src/urubu/spec/grammar/parser/vartan_lexer.go
@@ -0,0 +1,1339 @@
+// Code generated by maleeni-go. DO NOT EDIT.
+package parser
+
+import (
+ "fmt"
+ "io"
+ "io/ioutil"
+)
+
+type ModeID int
+
+func (id ModeID) Int() int {
+ return int(id)
+}
+
+type StateID int
+
+func (id StateID) Int() int {
+ return int(id)
+}
+
+type KindID int
+
+func (id KindID) Int() int {
+ return int(id)
+}
+
+type ModeKindID int
+
+func (id ModeKindID) Int() int {
+ return int(id)
+}
+
+type LexSpec interface {
+ InitialMode() ModeID
+ Pop(mode ModeID, modeKind ModeKindID) bool
+ Push(mode ModeID, modeKind ModeKindID) (ModeID, bool)
+ ModeName(mode ModeID) string
+ InitialState(mode ModeID) StateID
+ NextState(mode ModeID, state StateID, v int) (StateID, bool)
+ Accept(mode ModeID, state StateID) (ModeKindID, bool)
+ KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string)
+}
+
+// Token representes a token.
+type Token struct {
+ // ModeID is an ID of a lex mode.
+ ModeID ModeID
+
+ // KindID is an ID of a kind. This is unique among all modes.
+ KindID KindID
+
+ // ModeKindID is an ID of a lexical kind. This is unique only within a mode.
+ // Note that you need to use KindID field if you want to identify a kind across all modes.
+ ModeKindID ModeKindID
+
+ // Row is a row number where a lexeme appears.
+ Row int
+
+ // Col is a column number where a lexeme appears.
+ // Note that Col is counted in code points, not bytes.
+ Col int
+
+ // Lexeme is a byte sequence matched a pattern of a lexical specification.
+ Lexeme []byte
+
+ // When this field is true, it means the token is the EOF token.
+ EOF bool
+
+ // When this field is true, it means the token is an error token.
+ Invalid bool
+}
+
+type LexerOption func(l *Lexer) error
+
+// DisableModeTransition disables the active mode transition. Thus, even if the lexical specification has the push and pop
+// operations, the lexer doesn't perform these operations. When the lexical specification has multiple modes, and this option is
+// enabled, you need to call the Lexer.Push and Lexer.Pop methods to perform the mode transition. You can use the Lexer.Mode method
+// to know the current lex mode.
+func DisableModeTransition() LexerOption {
+ return func(l *Lexer) error {
+ l.passiveModeTran = true
+ return nil
+ }
+}
+
+type Lexer struct {
+ spec LexSpec
+ src []byte
+ srcPtr int
+ row int
+ col int
+ prevRow int
+ prevCol int
+ tokBuf []*Token
+ modeStack []ModeID
+ passiveModeTran bool
+}
+
+// NewLexer returns a new lexer.
+func NewLexer(spec LexSpec, src io.Reader, opts ...LexerOption) (*Lexer, error) {
+ b, err := ioutil.ReadAll(src)
+ if err != nil {
+ return nil, err
+ }
+ l := &Lexer{
+ spec: spec,
+ src: b,
+ srcPtr: 0,
+ row: 0,
+ col: 0,
+ modeStack: []ModeID{
+ spec.InitialMode(),
+ },
+ passiveModeTran: false,
+ }
+ for _, opt := range opts {
+ err := opt(l)
+ if err != nil {
+ return nil, err
+ }
+ }
+
+ return l, nil
+}
+
+// Next returns a next token.
+func (l *Lexer) Next() (*Token, error) {
+ if len(l.tokBuf) > 0 {
+ tok := l.tokBuf[0]
+ l.tokBuf = l.tokBuf[1:]
+ return tok, nil
+ }
+
+ tok, err := l.nextAndTransition()
+ if err != nil {
+ return nil, err
+ }
+ if !tok.Invalid {
+ return tok, nil
+ }
+ errTok := tok
+ for {
+ tok, err = l.nextAndTransition()
+ if err != nil {
+ return nil, err
+ }
+ if !tok.Invalid {
+ break
+ }
+ errTok.Lexeme = append(errTok.Lexeme, tok.Lexeme...)
+ }
+ l.tokBuf = append(l.tokBuf, tok)
+
+ return errTok, nil
+}
+
+func (l *Lexer) nextAndTransition() (*Token, error) {
+ tok, err := l.next()
+ if err != nil {
+ return nil, err
+ }
+ if tok.EOF || tok.Invalid {
+ return tok, nil
+ }
+ if l.passiveModeTran {
+ return tok, nil
+ }
+ mode := l.Mode()
+ if l.spec.Pop(mode, tok.ModeKindID) {
+ err := l.PopMode()
+ if err != nil {
+ return nil, err
+ }
+ }
+ if mode, ok := l.spec.Push(mode, tok.ModeKindID); ok {
+ l.PushMode(mode)
+ }
+ // The checking length of the mode stack must be at after pop and push operations because those operations can be performed
+ // at the same time. When the mode stack has just one element and popped it, the mode stack will be temporarily emptied.
+ // However, since a push operation may be performed immediately after it, the lexer allows the stack to be temporarily empty.
+ if len(l.modeStack) == 0 {
+ return nil, fmt.Errorf("a mode stack must have at least one element")
+ }
+ return tok, nil
+}
+
+func (l *Lexer) next() (*Token, error) {
+ mode := l.Mode()
+ state := l.spec.InitialState(mode)
+ buf := []byte{}
+ unfixedBufLen := 0
+ row := l.row
+ col := l.col
+ var tok *Token
+ for {
+ v, eof := l.read()
+ if eof {
+ if tok != nil {
+ l.unread(unfixedBufLen)
+ return tok, nil
+ }
+ // When `buf` has unaccepted data and reads the EOF, the lexer treats the buffered data as an invalid token.
+ if len(buf) > 0 {
+ return &Token{
+ ModeID: mode,
+ ModeKindID: 0,
+ Lexeme: buf,
+ Row: row,
+ Col: col,
+ Invalid: true,
+ }, nil
+ }
+ return &Token{
+ ModeID: mode,
+ ModeKindID: 0,
+ Row: 0,
+ Col: 0,
+ EOF: true,
+ }, nil
+ }
+ buf = append(buf, v)
+ unfixedBufLen++
+ nextState, ok := l.spec.NextState(mode, state, int(v))
+ if !ok {
+ if tok != nil {
+ l.unread(unfixedBufLen)
+ return tok, nil
+ }
+ return &Token{
+ ModeID: mode,
+ ModeKindID: 0,
+ Lexeme: buf,
+ Row: row,
+ Col: col,
+ Invalid: true,
+ }, nil
+ }
+ state = nextState
+ if modeKindID, ok := l.spec.Accept(mode, state); ok {
+ kindID, _ := l.spec.KindIDAndName(mode, modeKindID)
+ tok = &Token{
+ ModeID: mode,
+ KindID: kindID,
+ ModeKindID: modeKindID,
+ Lexeme: buf,
+ Row: row,
+ Col: col,
+ }
+ unfixedBufLen = 0
+ }
+ }
+}
+
+// Mode returns the current lex mode.
+func (l *Lexer) Mode() ModeID {
+ return l.modeStack[len(l.modeStack)-1]
+}
+
+// PushMode adds a lex mode onto the mode stack.
+func (l *Lexer) PushMode(mode ModeID) {
+ l.modeStack = append(l.modeStack, mode)
+}
+
+// PopMode removes a lex mode from the top of the mode stack.
+func (l *Lexer) PopMode() error {
+ sLen := len(l.modeStack)
+ if sLen == 0 {
+ return fmt.Errorf("cannot pop a lex mode from a lex mode stack any more")
+ }
+ l.modeStack = l.modeStack[:sLen-1]
+ return nil
+}
+
+func (l *Lexer) read() (byte, bool) {
+ if l.srcPtr >= len(l.src) {
+ return 0, true
+ }
+
+ b := l.src[l.srcPtr]
+ l.srcPtr++
+
+ l.prevRow = l.row
+ l.prevCol = l.col
+
+ // Count the token positions.
+ // The driver treats LF as the end of lines and counts columns in code points, not bytes.
+ // To count in code points, we refer to the First Byte column in the Table 3-6.
+ //
+ // Reference:
+ // - [Table 3-6] https://www.unicode.org/versions/Unicode13.0.0/ch03.pdf > Table 3-6. UTF-8 Bit Distribution
+ if b < 128 {
+ // 0x0A is LF.
+ if b == 0x0A {
+ l.row++
+ l.col = 0
+ } else {
+ l.col++
+ }
+ } else if b>>5 == 6 || b>>4 == 14 || b>>3 == 30 {
+ l.col++
+ }
+
+ return b, false
+}
+
+// We must not call this function consecutively to record the token position correctly.
+func (l *Lexer) unread(n int) {
+ l.srcPtr -= n
+
+ l.row = l.prevRow
+ l.col = l.prevCol
+}
+
+const (
+ ModeIDNil ModeID = 0
+ ModeIDDefault ModeID = 1
+ ModeIDTerminal ModeID = 2
+ ModeIDStringLiteral ModeID = 3
+)
+
+const (
+ ModeNameNil = ""
+ ModeNameDefault = "default"
+ ModeNameTerminal = "terminal"
+ ModeNameStringLiteral = "string_literal"
+)
+
+// ModeIDToName converts a mode ID to a name.
+func ModeIDToName(id ModeID) string {
+ switch id {
+ case ModeIDNil:
+ return ModeNameNil
+ case ModeIDDefault:
+ return ModeNameDefault
+ case ModeIDTerminal:
+ return ModeNameTerminal
+ case ModeIDStringLiteral:
+ return ModeNameStringLiteral
+ }
+ return ""
+}
+
+const (
+ KindIDNil KindID = 0
+ KindIDWhiteSpace KindID = 1
+ KindIDNewline KindID = 2
+ KindIDLineComment KindID = 3
+ KindIDKwFragment KindID = 4
+ KindIDIdentifier KindID = 5
+ KindIDTerminalOpen KindID = 6
+ KindIDStringLiteralOpen KindID = 7
+ KindIDColon KindID = 8
+ KindIDOr KindID = 9
+ KindIDSemicolon KindID = 10
+ KindIDLabelMarker KindID = 11
+ KindIDExpansion KindID = 12
+ KindIDDirectiveMarker KindID = 13
+ KindIDOrderedSymbolMarker KindID = 14
+ KindIDLParen KindID = 15
+ KindIDRParen KindID = 16
+ KindIDPattern KindID = 17
+ KindIDEscapeSymbol KindID = 18
+ KindIDTerminalClose KindID = 19
+ KindIDCharSeq KindID = 20
+ KindIDStringLiteralClose KindID = 21
+)
+
+const (
+ KindNameNil = ""
+ KindNameWhiteSpace = "white_space"
+ KindNameNewline = "newline"
+ KindNameLineComment = "line_comment"
+ KindNameKwFragment = "kw_fragment"
+ KindNameIdentifier = "identifier"
+ KindNameTerminalOpen = "terminal_open"
+ KindNameStringLiteralOpen = "string_literal_open"
+ KindNameColon = "colon"
+ KindNameOr = "or"
+ KindNameSemicolon = "semicolon"
+ KindNameLabelMarker = "label_marker"
+ KindNameExpansion = "expansion"
+ KindNameDirectiveMarker = "directive_marker"
+ KindNameOrderedSymbolMarker = "ordered_symbol_marker"
+ KindNameLParen = "l_paren"
+ KindNameRParen = "r_paren"
+ KindNamePattern = "pattern"
+ KindNameEscapeSymbol = "escape_symbol"
+ KindNameTerminalClose = "terminal_close"
+ KindNameCharSeq = "char_seq"
+ KindNameStringLiteralClose = "string_literal_close"
+)
+
+// KindIDToName converts a kind ID to a name.
+func KindIDToName(id KindID) string {
+ switch id {
+ case KindIDNil:
+ return KindNameNil
+ case KindIDWhiteSpace:
+ return KindNameWhiteSpace
+ case KindIDNewline:
+ return KindNameNewline
+ case KindIDLineComment:
+ return KindNameLineComment
+ case KindIDKwFragment:
+ return KindNameKwFragment
+ case KindIDIdentifier:
+ return KindNameIdentifier
+ case KindIDTerminalOpen:
+ return KindNameTerminalOpen
+ case KindIDStringLiteralOpen:
+ return KindNameStringLiteralOpen
+ case KindIDColon:
+ return KindNameColon
+ case KindIDOr:
+ return KindNameOr
+ case KindIDSemicolon:
+ return KindNameSemicolon
+ case KindIDLabelMarker:
+ return KindNameLabelMarker
+ case KindIDExpansion:
+ return KindNameExpansion
+ case KindIDDirectiveMarker:
+ return KindNameDirectiveMarker
+ case KindIDOrderedSymbolMarker:
+ return KindNameOrderedSymbolMarker
+ case KindIDLParen:
+ return KindNameLParen
+ case KindIDRParen:
+ return KindNameRParen
+ case KindIDPattern:
+ return KindNamePattern
+ case KindIDEscapeSymbol:
+ return KindNameEscapeSymbol
+ case KindIDTerminalClose:
+ return KindNameTerminalClose
+ case KindIDCharSeq:
+ return KindNameCharSeq
+ case KindIDStringLiteralClose:
+ return KindNameStringLiteralClose
+ }
+ return ""
+}
+
+type lexSpec struct {
+ pop [][]bool
+ push [][]ModeID
+ modeNames []string
+ initialStates []StateID
+ acceptances [][]ModeKindID
+ kindIDs [][]KindID
+ kindNames []string
+ initialModeID ModeID
+ modeIDNil ModeID
+ modeKindIDNil ModeKindID
+ stateIDNil StateID
+
+ rowNums [][]int
+ rowDisplacements [][]int
+ bounds [][]int
+ entries [][]StateID
+ originalColCounts []int
+}
+
+func NewLexSpec() *lexSpec {
+ return &lexSpec{
+ pop: [][]bool{
+ nil,
+ {
+ false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false,
+ },
+ {
+ false, false, false, true,
+ },
+ {
+ false, false, true,
+ },
+ },
+ push: [][]ModeID{
+ nil,
+ {
+ 0, 0, 0, 0, 0, 0, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ },
+ {
+ 0, 0, 0, 0,
+ },
+ {
+ 0, 0, 0,
+ },
+ },
+ modeNames: []string{
+ ModeNameNil,
+ ModeNameDefault,
+ ModeNameTerminal,
+ ModeNameStringLiteral,
+ },
+ initialStates: []StateID{
+ 0,
+ 1,
+ 1,
+ 1,
+ },
+ acceptances: [][]ModeKindID{
+ nil,
+ {
+ 0, 0, 1, 2, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 5, 5, 5, 5, 5, 5, 5, 4, 5, 0, 0, 2, 6, 7, 8, 9,
+ 10, 11, 12, 13, 14, 15, 16,
+ },
+ {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3,
+ },
+ {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2,
+ },
+ },
+ kindIDs: [][]KindID{
+ nil,
+ {
+ KindIDNil,
+ KindIDWhiteSpace,
+ KindIDNewline,
+ KindIDLineComment,
+ KindIDKwFragment,
+ KindIDIdentifier,
+ KindIDTerminalOpen,
+ KindIDStringLiteralOpen,
+ KindIDColon,
+ KindIDOr,
+ KindIDSemicolon,
+ KindIDLabelMarker,
+ KindIDExpansion,
+ KindIDDirectiveMarker,
+ KindIDOrderedSymbolMarker,
+ KindIDLParen,
+ KindIDRParen,
+ },
+ {
+ KindIDNil,
+ KindIDPattern,
+ KindIDEscapeSymbol,
+ KindIDTerminalClose,
+ },
+ {
+ KindIDNil,
+ KindIDCharSeq,
+ KindIDStringLiteralClose,
+ },
+ },
+ kindNames: []string{
+ KindNameNil,
+ KindNameWhiteSpace,
+ KindNameNewline,
+ KindNameLineComment,
+ KindNameKwFragment,
+ KindNameIdentifier,
+ KindNameTerminalOpen,
+ KindNameStringLiteralOpen,
+ KindNameColon,
+ KindNameOr,
+ KindNameSemicolon,
+ KindNameLabelMarker,
+ KindNameExpansion,
+ KindNameDirectiveMarker,
+ KindNameOrderedSymbolMarker,
+ KindNameLParen,
+ KindNameRParen,
+ KindNamePattern,
+ KindNameEscapeSymbol,
+ KindNameTerminalClose,
+ KindNameCharSeq,
+ KindNameStringLiteralClose,
+ },
+ initialModeID: ModeIDDefault,
+ modeIDNil: ModeIDNil,
+ modeKindIDNil: 0,
+ stateIDNil: 0,
+
+ rowNums: [][]int{
+ nil,
+ {
+ 0, 1, 2, 3, 4, 5, 6, 7, 6, 8, 6, 9, 6, 10, 6, 11, 12, 6, 13, 14,
+ 6, 15, 16, 6, 17, 18, 19, 20, 21, 22, 23, 24, 24, 25, 26, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0,
+ },
+ {
+ 0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2,
+ 13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 24,
+ 2, 25, 2, 26, 2, 27, 2, 28, 2, 29, 30, 2, 31, 32, 2, 33, 34, 2, 35, 2,
+ 36, 2, 37, 2, 38, 2, 39, 2, 40, 41, 2, 42, 43, 2, 44, 45, 2, 0,
+ },
+ {
+ 0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2,
+ 13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 0,
+ },
+ },
+ rowDisplacements: [][]int{
+ nil,
+ {
+ 0, 236, 1554, 1555, 1556, 0, 237, 1323, 301, 1387, 365, 1291, 429, 493, 557, 1419, 621, 765, 840, 915,
+ 990, 1065, 1140, 1215, 1290, 1558, 1559,
+ },
+ {
+ 0, 0, 736, 2548, 852, 2612, 916, 2372, 980, 1044, 1108, 2839, 1172, 245, 2613, 1236, 2677, 1300, 2420, 1364,
+ 1428, 1492, 2855, 1556, 735, 2678, 1620, 2742, 1684, 2468, 1748, 1812, 1876, 2871, 1940, 490, 2743, 2004, 2807, 2068,
+ 2516, 2132, 2196, 2260, 2887, 2324,
+ },
+ {
+ 0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1355, 682, 245, 1259, 746, 1323, 810, 1162, 874,
+ 938, 1002, 1371, 1066,
+ },
+ },
+ bounds: [][]int{
+ nil,
+ {
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, -1, 5, 5, -1, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1,
+ -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1,
+ 1, -1, -1, -1, -1, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
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+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 39,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 7, 9, 9,
+ 11, 14, 14, 14, 17, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 0, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+ 24, 24, 26, 28, 28, 30, 33, 33, 33, 36, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 25, 25, 25, 25, 25, 25,
+ 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+ 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+ 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 29, 29,
+ 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+ 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+ 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+ 29, 29, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
+ 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
+ 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
+ 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
+ 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
+ 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
+ 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 38, 38, 38, 38, 38, 38,
+ 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+ 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+ 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
+ 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
+ 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 27, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 37,
+ 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0,
+ },
+ },
+ originalColCounts: nil,
+ }
+}
+
+func (s *lexSpec) InitialMode() ModeID {
+ return s.initialModeID
+}
+
+func (s *lexSpec) Pop(mode ModeID, modeKind ModeKindID) bool {
+ return s.pop[mode][modeKind]
+}
+
+func (s *lexSpec) Push(mode ModeID, modeKind ModeKindID) (ModeID, bool) {
+ id := s.push[mode][modeKind]
+ return id, id != s.modeIDNil
+}
+
+func (s *lexSpec) ModeName(mode ModeID) string {
+ return s.modeNames[mode]
+}
+
+func (s *lexSpec) InitialState(mode ModeID) StateID {
+ return s.initialStates[mode]
+}
+
+func (s *lexSpec) NextState(mode ModeID, state StateID, v int) (StateID, bool) {
+ rowNum := s.rowNums[mode][state]
+ d := s.rowDisplacements[mode][rowNum]
+ if s.bounds[mode][d+v] != rowNum {
+ return s.stateIDNil, false
+ }
+ return s.entries[mode][d+v], true
+}
+
+func (s *lexSpec) Accept(mode ModeID, state StateID) (ModeKindID, bool) {
+ id := s.acceptances[mode][state]
+ return id, id != s.modeKindIDNil
+}
+
+func (s *lexSpec) KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string) {
+ id := s.kindIDs[mode][modeKind]
+ return id, s.kindNames[id]
+}
diff --git a/src/urubu/spec/grammar/util.go b/src/urubu/spec/grammar/util.go
new file mode 100644
index 0000000..bf3f233
--- /dev/null
+++ b/src/urubu/spec/grammar/util.go
@@ -0,0 +1,21 @@
+package grammar
+
+import "strings"
+
+var rep = strings.NewReplacer(
+ `.`, `\.`,
+ `*`, `\*`,
+ `+`, `\+`,
+ `?`, `\?`,
+ `|`, `\|`,
+ `(`, `\(`,
+ `)`, `\)`,
+ `[`, `\[`,
+ `\`, `\\`,
+)
+
+// EscapePattern escapes the special characters.
+// For example, EscapePattern(`+`) returns `\+`.
+func EscapePattern(s string) string {
+ return rep.Replace(s)
+}
diff --git a/src/urubu/spec/test/parser.go b/src/urubu/spec/test/parser.go
new file mode 100644
index 0000000..b7265d7
--- /dev/null
+++ b/src/urubu/spec/test/parser.go
@@ -0,0 +1,336 @@
+//go:generate vartan compile tree.vartan -o tree.json
+//go:generate vartan-go tree.json --package test
+
+package test
+
+import (
+ "bufio"
+ "bytes"
+ "errors"
+ "fmt"
+ "io"
+ "regexp"
+ "strconv"
+ "strings"
+ "unicode/utf8"
+)
+
+type TreeDiff struct {
+ ExpectedPath string
+ ActualPath string
+ Message string
+}
+
+func newTreeDiff(expected, actual *Tree, message string) *TreeDiff {
+ return &TreeDiff{
+ ExpectedPath: expected.path(),
+ ActualPath: actual.path(),
+ Message: message,
+ }
+}
+
+type Tree struct {
+ Parent *Tree
+ Offset int
+ Kind string
+ Children []*Tree
+ Lexeme string
+}
+
+func NewNonTerminalTree(kind string, children ...*Tree) *Tree {
+ return &Tree{
+ Kind: kind,
+ Children: children,
+ }
+}
+
+func NewTerminalNode(kind string, lexeme string) *Tree {
+ return &Tree{
+ Kind: kind,
+ Lexeme: lexeme,
+ }
+}
+
+func (t *Tree) Fill() *Tree {
+ for i, c := range t.Children {
+ c.Parent = t
+ c.Offset = i
+ c.Fill()
+ }
+ return t
+}
+
+func (t *Tree) path() string {
+ if t.Parent == nil {
+ return t.Kind
+ }
+ return fmt.Sprintf("%v.[%v]%v", t.Parent.path(), t.Offset, t.Kind)
+}
+
+func (t *Tree) Format() []byte {
+ var b bytes.Buffer
+ t.format(&b, 0)
+ return b.Bytes()
+}
+
+func (t *Tree) format(buf *bytes.Buffer, depth int) {
+ for i := 0; i < depth; i++ {
+ buf.WriteString(" ")
+ }
+ buf.WriteString("(")
+ buf.WriteString(t.Kind)
+ if len(t.Children) > 0 {
+ buf.WriteString("\n")
+ for i, c := range t.Children {
+ c.format(buf, depth+1)
+ if i < len(t.Children)-1 {
+ buf.WriteString("\n")
+ }
+ }
+ }
+ buf.WriteString(")")
+}
+
+func DiffTree(expected, actual *Tree) []*TreeDiff {
+ if expected == nil && actual == nil {
+ return nil
+ }
+ if actual.Kind != expected.Kind {
+ msg := fmt.Sprintf("unexpected kind: expected '%v' but got '%v'", expected.Kind, actual.Kind)
+ return []*TreeDiff{
+ newTreeDiff(expected, actual, msg),
+ }
+ }
+ if expected.Lexeme != actual.Lexeme {
+ msg := fmt.Sprintf("unexpected lexeme: expected '%v' but got '%v'", expected.Lexeme, actual.Lexeme)
+ return []*TreeDiff{
+ newTreeDiff(expected, actual, msg),
+ }
+ }
+ if len(actual.Children) != len(expected.Children) {
+ msg := fmt.Sprintf("unexpected node count: expected %v but got %v", len(expected.Children), len(actual.Children))
+ return []*TreeDiff{
+ newTreeDiff(expected, actual, msg),
+ }
+ }
+ var diffs []*TreeDiff
+ for i, exp := range expected.Children {
+ if ds := DiffTree(exp, actual.Children[i]); len(ds) > 0 {
+ diffs = append(diffs, ds...)
+ }
+ }
+ return diffs
+}
+
+type TestCase struct {
+ Description string
+ Source []byte
+ Output *Tree
+}
+
+func ParseTestCase(r io.Reader) (*TestCase, error) {
+ parts, err := splitIntoParts(r)
+ if err != nil {
+ return nil, err
+ }
+ if len(parts) != 3 {
+ return nil, fmt.Errorf("too many or too few part delimiters: a test case consists of just tree parts: %v parts found", len(parts))
+ }
+
+ tp := &treeParser{
+ lineOffset: parts[0].lineCount + parts[1].lineCount + 2,
+ }
+ tree, err := tp.parseTree(bytes.NewReader(parts[2].buf))
+ if err != nil {
+ return nil, err
+ }
+
+ return &TestCase{
+ Description: string(parts[0].buf),
+ Source: parts[1].buf,
+ Output: tree,
+ }, nil
+}
+
+type testCasePart struct {
+ buf []byte
+ lineCount int
+}
+
+func splitIntoParts(r io.Reader) ([]*testCasePart, error) {
+ var bufs []*testCasePart
+ s := bufio.NewScanner(r)
+ for {
+ buf, lineCount, err := readPart(s)
+ if err != nil {
+ return nil, err
+ }
+ if buf == nil {
+ break
+ }
+ bufs = append(bufs, &testCasePart{
+ buf: buf,
+ lineCount: lineCount,
+ })
+ }
+ if err := s.Err(); err != nil {
+ return nil, err
+ }
+ return bufs, nil
+}
+
+var reDelim = regexp.MustCompile(`^\s*---+\s*$`)
+
+func readPart(s *bufio.Scanner) ([]byte, int, error) {
+ if !s.Scan() {
+ return nil, 0, s.Err()
+ }
+ buf := &bytes.Buffer{}
+ line := s.Bytes()
+ if reDelim.Match(line) {
+ // Return an empty slice because (*bytes.Buffer).Bytes() returns nil if we have never written data.
+ return []byte{}, 0, nil
+ }
+ _, err := buf.Write(line)
+ if err != nil {
+ return nil, 0, err
+ }
+ lineCount := 1
+ for s.Scan() {
+ line := s.Bytes()
+ if reDelim.Match(line) {
+ return buf.Bytes(), lineCount, nil
+ }
+ _, err := buf.Write([]byte("\n"))
+ if err != nil {
+ return nil, 0, err
+ }
+ _, err = buf.Write(line)
+ if err != nil {
+ return nil, 0, err
+ }
+ lineCount++
+ }
+ if err := s.Err(); err != nil {
+ return nil, 0, err
+ }
+ return buf.Bytes(), lineCount, nil
+}
+
+type treeParser struct {
+ lineOffset int
+}
+
+func (tp *treeParser) parseTree(src io.Reader) (*Tree, error) {
+ toks, err := NewTokenStream(src)
+ if err != nil {
+ return nil, err
+ }
+ gram := NewGrammar()
+ tb := NewDefaultSyntaxTreeBuilder()
+ p, err := NewParser(toks, gram, SemanticAction(NewASTActionSet(gram, tb)))
+ if err != nil {
+ return nil, err
+ }
+ err = p.Parse()
+ if err != nil {
+ return nil, err
+ }
+ synErrs := p.SyntaxErrors()
+ if len(synErrs) > 0 {
+ var b strings.Builder
+ b.Write(formatSyntaxError(synErrs[0], gram, tp.lineOffset))
+ for _, synErr := range synErrs[1:] {
+ b.WriteRune('\n')
+ b.Write(formatSyntaxError(synErr, gram, tp.lineOffset))
+ }
+ return nil, errors.New(b.String())
+ }
+ t, err := tp.genTree(tb.Tree())
+ if err != nil {
+ return nil, err
+ }
+ return t.Fill(), nil
+}
+
+func formatSyntaxError(synErr *SyntaxError, gram Grammar, lineOffset int) []byte {
+ var b bytes.Buffer
+
+ b.WriteString(fmt.Sprintf("%v:%v: %v: ", lineOffset+synErr.Row+1, synErr.Col+1, synErr.Message))
+
+ tok := synErr.Token
+ switch {
+ case tok.EOF():
+ b.WriteString("<eof>")
+ case tok.Invalid():
+ b.WriteString(fmt.Sprintf("'%v' (<invalid>)", string(tok.Lexeme())))
+ default:
+ if term := gram.Terminal(tok.TerminalID()); term != "" {
+ b.WriteString(fmt.Sprintf("'%v' (%v)", string(tok.Lexeme()), term))
+ } else {
+ b.WriteString(fmt.Sprintf("'%v'", string(tok.Lexeme())))
+ }
+ }
+ b.WriteString(fmt.Sprintf(": expected: %v", synErr.ExpectedTerminals[0]))
+ for _, t := range synErr.ExpectedTerminals[1:] {
+ b.WriteString(fmt.Sprintf(", %v", t))
+ }
+
+ return b.Bytes()
+}
+
+func (tp *treeParser) genTree(node *Node) (*Tree, error) {
+ // A node labeled 'error' cannot have children. It always must be (error).
+ if sym := node.Children[0]; sym.Text == "error" {
+ if len(node.Children) > 1 {
+ return nil, fmt.Errorf("%v:%v: error node cannot take children", tp.lineOffset+sym.Row+1, sym.Col+1)
+ }
+ return NewTerminalNode(sym.Text, ""), nil
+ }
+
+ if len(node.Children) == 2 && node.Children[1].KindName == "string" {
+ var text string
+ str := node.Children[1].Children[0]
+ switch str.KindName {
+ case "raw_string":
+ text = str.Children[0].Text
+ case "interpreted_string":
+ var b strings.Builder
+ for _, c := range str.Children {
+ switch c.KindName {
+ case "escaped_seq":
+ b.WriteString(strings.TrimPrefix(`\`, c.Text))
+ case "escape_char":
+ return nil, fmt.Errorf("%v:%v: incomplete escape sequence", tp.lineOffset+c.Row+1, c.Col+1)
+ case "codepoint_expr":
+ cp := c.Children[0]
+ n, err := strconv.ParseInt(cp.Text, 16, 64)
+ if err != nil {
+ return nil, fmt.Errorf("%v:%v: %v", tp.lineOffset+cp.Row+1, cp.Col+1, err)
+ }
+ if !utf8.ValidRune(rune(n)) {
+ return nil, fmt.Errorf("%v:%v: invalid code point: %v", tp.lineOffset+cp.Row+1, cp.Col+1, cp.Text)
+ }
+ b.WriteRune(rune(n))
+ default:
+ b.WriteString(c.Text)
+ }
+ }
+ text = b.String()
+ }
+ return NewTerminalNode(node.Children[0].Text, text), nil
+ }
+
+ var children []*Tree
+ if len(node.Children) > 1 {
+ children = make([]*Tree, len(node.Children)-1)
+ for i, c := range node.Children[1:] {
+ var err error
+ children[i], err = tp.genTree(c)
+ if err != nil {
+ return nil, err
+ }
+ }
+ }
+ return NewNonTerminalTree(node.Children[0].Text, children...), nil
+}
diff --git a/src/urubu/spec/test/tree-report.json b/src/urubu/spec/test/tree-report.json
new file mode 100644
index 0000000..c2018e5
--- /dev/null
+++ b/src/urubu/spec/test/tree-report.json
@@ -0,0 +1 @@
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diff --git a/src/urubu/spec/test/tree.vartan b/src/urubu/spec/test/tree.vartan
new file mode 100644
index 0000000..aa8f733
--- /dev/null
+++ b/src/urubu/spec/test/tree.vartan
@@ -0,0 +1,87 @@
+#name tree;
+
+#prec (
+ #assign l_paren
+ #assign $empty_tree
+);
+
+tree
+ : l_paren identifier tree_list r_paren #ast identifier tree_list...
+ | l_paren identifier string r_paren #ast identifier string
+ | l_paren error r_paren #recover #ast error
+ ;
+tree_list
+ : tree_list tree #ast tree_list... tree
+ | tree
+ | #prec $empty_tree
+ ;
+string
+ : raw_string
+ | interpreted_string
+ ;
+raw_string
+ : raw_string_open opt_raw_string_body raw_string_close #ast opt_raw_string_body...
+ ;
+opt_raw_string_body
+ : raw_string_body
+ |
+ ;
+interpreted_string
+ : interpreted_string_open opt_interpreted_string_body interpreted_string_close #ast opt_interpreted_string_body...
+ | interpreted_string_open error interpreted_string_close #recover #ast error
+ ;
+opt_interpreted_string_body
+ : interpreted_string_body #ast interpreted_string_body...
+ |
+ ;
+interpreted_string_body
+ : interpreted_string_body interpreted_string_elem #ast interpreted_string_body... interpreted_string_elem...
+ | interpreted_string_elem #ast interpreted_string_elem...
+ ;
+interpreted_string_elem
+ : interpreted_seq
+ | l_brace
+ | r_brace
+ | hex_digits
+ | escaped_seq
+ | escape_char
+ | codepoint_expr
+ ;
+codepoint_expr
+ : codepoint_prefix l_brace hex_digits r_brace #ast hex_digits
+ ;
+
+ws #skip
+ : "[\u{0009}\u{000A}\u{000D}\u{0020}]+";
+l_paren
+ : '(';
+r_paren
+ : ')';
+identifier
+ : "[0-9A-Za-z_]+";
+
+raw_string_open #push raw_string
+ : "'";
+raw_string_body #mode raw_string
+ : "[^']+";
+raw_string_close #mode raw_string #pop
+ : "'";
+
+interpreted_string_open #push interpreted_string
+ : '"';
+interpreted_seq #mode interpreted_string
+ : "[^\"\\{}0-9A-Fa-f]+";
+codepoint_prefix #mode interpreted_string
+ : '\u';
+l_brace #mode interpreted_string
+ : '{';
+r_brace #mode interpreted_string
+ : '}';
+hex_digits #mode interpreted_string
+ : "[0-9A-Fa-f]+";
+escaped_seq #mode interpreted_string
+ : "\\[\"\\]";
+escape_char #mode interpreted_string
+ : '\';
+interpreted_string_close #mode interpreted_string #pop
+ : '"';
diff --git a/src/urubu/spec/test/tree_lexer.go b/src/urubu/spec/test/tree_lexer.go
new file mode 100644
index 0000000..8bb1c87
--- /dev/null
+++ b/src/urubu/spec/test/tree_lexer.go
@@ -0,0 +1,1024 @@
+// Code generated by vartan-go. DO NOT EDIT.
+package test
+
+import (
+ "fmt"
+ "io"
+)
+
+type ModeID int
+
+func (id ModeID) Int() int {
+ return int(id)
+}
+
+type StateID int
+
+func (id StateID) Int() int {
+ return int(id)
+}
+
+type KindID int
+
+func (id KindID) Int() int {
+ return int(id)
+}
+
+type ModeKindID int
+
+func (id ModeKindID) Int() int {
+ return int(id)
+}
+
+type LexSpec interface {
+ InitialMode() ModeID
+ Pop(mode ModeID, modeKind ModeKindID) bool
+ Push(mode ModeID, modeKind ModeKindID) (ModeID, bool)
+ ModeName(mode ModeID) string
+ InitialState(mode ModeID) StateID
+ NextState(mode ModeID, state StateID, v int) (StateID, bool)
+ Accept(mode ModeID, state StateID) (ModeKindID, bool)
+ KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string)
+}
+
+// Token representes a token.
+type Token struct {
+ // ModeID is an ID of a lex mode.
+ ModeID ModeID
+
+ // KindID is an ID of a kind. This is unique among all modes.
+ KindID KindID
+
+ // ModeKindID is an ID of a lexical kind. This is unique only within a mode.
+ // Note that you need to use KindID field if you want to identify a kind across all modes.
+ ModeKindID ModeKindID
+
+ // Row is a row number where a lexeme appears.
+ Row int
+
+ // Col is a column number where a lexeme appears.
+ // Note that Col is counted in code points, not bytes.
+ Col int
+
+ // Lexeme is a byte sequence matched a pattern of a lexical specification.
+ Lexeme []byte
+
+ // When this field is true, it means the token is the EOF token.
+ EOF bool
+
+ // When this field is true, it means the token is an error token.
+ Invalid bool
+}
+
+type LexerOption func(l *Lexer) error
+
+// DisableModeTransition disables the active mode transition. Thus, even if the lexical specification has the push and pop
+// operations, the lexer doesn't perform these operations. When the lexical specification has multiple modes, and this option is
+// enabled, you need to call the Lexer.Push and Lexer.Pop methods to perform the mode transition. You can use the Lexer.Mode method
+// to know the current lex mode.
+func DisableModeTransition() LexerOption {
+ return func(l *Lexer) error {
+ l.passiveModeTran = true
+ return nil
+ }
+}
+
+type Lexer struct {
+ spec LexSpec
+ src []byte
+ srcPtr int
+ row int
+ col int
+ prevRow int
+ prevCol int
+ tokBuf []*Token
+ modeStack []ModeID
+ passiveModeTran bool
+}
+
+// NewLexer returns a new lexer.
+func NewLexer(spec LexSpec, src io.Reader, opts ...LexerOption) (*Lexer, error) {
+ b, err := io.ReadAll(src)
+ if err != nil {
+ return nil, err
+ }
+ l := &Lexer{
+ spec: spec,
+ src: b,
+ srcPtr: 0,
+ row: 0,
+ col: 0,
+ modeStack: []ModeID{
+ spec.InitialMode(),
+ },
+ passiveModeTran: false,
+ }
+ for _, opt := range opts {
+ err := opt(l)
+ if err != nil {
+ return nil, err
+ }
+ }
+
+ return l, nil
+}
+
+// Next returns a next token.
+func (l *Lexer) Next() (*Token, error) {
+ if len(l.tokBuf) > 0 {
+ tok := l.tokBuf[0]
+ l.tokBuf = l.tokBuf[1:]
+ return tok, nil
+ }
+
+ tok, err := l.nextAndTransition()
+ if err != nil {
+ return nil, err
+ }
+ if !tok.Invalid {
+ return tok, nil
+ }
+ errTok := tok
+ for {
+ tok, err = l.nextAndTransition()
+ if err != nil {
+ return nil, err
+ }
+ if !tok.Invalid {
+ break
+ }
+ errTok.Lexeme = append(errTok.Lexeme, tok.Lexeme...)
+ }
+ l.tokBuf = append(l.tokBuf, tok)
+
+ return errTok, nil
+}
+
+func (l *Lexer) nextAndTransition() (*Token, error) {
+ tok, err := l.next()
+ if err != nil {
+ return nil, err
+ }
+ if tok.EOF || tok.Invalid {
+ return tok, nil
+ }
+ if l.passiveModeTran {
+ return tok, nil
+ }
+ mode := l.Mode()
+ if l.spec.Pop(mode, tok.ModeKindID) {
+ err := l.PopMode()
+ if err != nil {
+ return nil, err
+ }
+ }
+ if mode, ok := l.spec.Push(mode, tok.ModeKindID); ok {
+ l.PushMode(mode)
+ }
+ // The checking length of the mode stack must be at after pop and push operations because those operations can be performed
+ // at the same time. When the mode stack has just one element and popped it, the mode stack will be temporarily emptied.
+ // However, since a push operation may be performed immediately after it, the lexer allows the stack to be temporarily empty.
+ if len(l.modeStack) == 0 {
+ return nil, fmt.Errorf("a mode stack must have at least one element")
+ }
+ return tok, nil
+}
+
+func (l *Lexer) next() (*Token, error) {
+ mode := l.Mode()
+ state := l.spec.InitialState(mode)
+ buf := []byte{}
+ unfixedBufLen := 0
+ row := l.row
+ col := l.col
+ var tok *Token
+ for {
+ v, eof := l.read()
+ if eof {
+ if tok != nil {
+ l.unread(unfixedBufLen)
+ return tok, nil
+ }
+ // When `buf` has unaccepted data and reads the EOF, the lexer treats the buffered data as an invalid token.
+ if len(buf) > 0 {
+ return &Token{
+ ModeID: mode,
+ ModeKindID: 0,
+ Lexeme: buf,
+ Row: row,
+ Col: col,
+ Invalid: true,
+ }, nil
+ }
+ return &Token{
+ ModeID: mode,
+ ModeKindID: 0,
+ Row: 0,
+ Col: 0,
+ EOF: true,
+ }, nil
+ }
+ buf = append(buf, v)
+ unfixedBufLen++
+ nextState, ok := l.spec.NextState(mode, state, int(v))
+ if !ok {
+ if tok != nil {
+ l.unread(unfixedBufLen)
+ return tok, nil
+ }
+ return &Token{
+ ModeID: mode,
+ ModeKindID: 0,
+ Lexeme: buf,
+ Row: row,
+ Col: col,
+ Invalid: true,
+ }, nil
+ }
+ state = nextState
+ if modeKindID, ok := l.spec.Accept(mode, state); ok {
+ kindID, _ := l.spec.KindIDAndName(mode, modeKindID)
+ tok = &Token{
+ ModeID: mode,
+ KindID: kindID,
+ ModeKindID: modeKindID,
+ Lexeme: buf,
+ Row: row,
+ Col: col,
+ }
+ unfixedBufLen = 0
+ }
+ }
+}
+
+// Mode returns the current lex mode.
+func (l *Lexer) Mode() ModeID {
+ return l.modeStack[len(l.modeStack)-1]
+}
+
+// PushMode adds a lex mode onto the mode stack.
+func (l *Lexer) PushMode(mode ModeID) {
+ l.modeStack = append(l.modeStack, mode)
+}
+
+// PopMode removes a lex mode from the top of the mode stack.
+func (l *Lexer) PopMode() error {
+ sLen := len(l.modeStack)
+ if sLen == 0 {
+ return fmt.Errorf("cannot pop a lex mode from a lex mode stack any more")
+ }
+ l.modeStack = l.modeStack[:sLen-1]
+ return nil
+}
+
+func (l *Lexer) read() (byte, bool) {
+ if l.srcPtr >= len(l.src) {
+ return 0, true
+ }
+
+ b := l.src[l.srcPtr]
+ l.srcPtr++
+
+ l.prevRow = l.row
+ l.prevCol = l.col
+
+ // Count the token positions.
+ // The driver treats LF as the end of lines and counts columns in code points, not bytes.
+ // To count in code points, we refer to the First Byte column in the Table 3-6.
+ //
+ // Reference:
+ // - [Table 3-6] https://www.unicode.org/versions/Unicode13.0.0/ch03.pdf > Table 3-6. UTF-8 Bit Distribution
+ if b < 128 {
+ // 0x0A is LF.
+ if b == 0x0A {
+ l.row++
+ l.col = 0
+ } else {
+ l.col++
+ }
+ } else if b>>5 == 6 || b>>4 == 14 || b>>3 == 30 {
+ l.col++
+ }
+
+ return b, false
+}
+
+// We must not call this function consecutively to record the token position correctly.
+func (l *Lexer) unread(n int) {
+ l.srcPtr -= n
+
+ l.row = l.prevRow
+ l.col = l.prevCol
+}
+
+const (
+ ModeIDNil ModeID = 0
+ ModeIDDefault ModeID = 1
+ ModeIDRawString ModeID = 2
+ ModeIDInterpretedString ModeID = 3
+)
+
+const (
+ ModeNameNil = ""
+ ModeNameDefault = "default"
+ ModeNameRawString = "raw_string"
+ ModeNameInterpretedString = "interpreted_string"
+)
+
+// ModeIDToName converts a mode ID to a name.
+func ModeIDToName(id ModeID) string {
+ switch id {
+ case ModeIDNil:
+ return ModeNameNil
+ case ModeIDDefault:
+ return ModeNameDefault
+ case ModeIDRawString:
+ return ModeNameRawString
+ case ModeIDInterpretedString:
+ return ModeNameInterpretedString
+ }
+ return ""
+}
+
+const (
+ KindIDNil KindID = 0
+ KindIDWs KindID = 1
+ KindIDLParen KindID = 2
+ KindIDRParen KindID = 3
+ KindIDIdentifier KindID = 4
+ KindIDRawStringOpen KindID = 5
+ KindIDInterpretedStringOpen KindID = 6
+ KindIDRawStringBody KindID = 7
+ KindIDRawStringClose KindID = 8
+ KindIDInterpretedSeq KindID = 9
+ KindIDCodepointPrefix KindID = 10
+ KindIDLBrace KindID = 11
+ KindIDRBrace KindID = 12
+ KindIDHexDigits KindID = 13
+ KindIDEscapedSeq KindID = 14
+ KindIDEscapeChar KindID = 15
+ KindIDInterpretedStringClose KindID = 16
+)
+
+const (
+ KindNameNil = ""
+ KindNameWs = "ws"
+ KindNameLParen = "l_paren"
+ KindNameRParen = "r_paren"
+ KindNameIdentifier = "identifier"
+ KindNameRawStringOpen = "raw_string_open"
+ KindNameInterpretedStringOpen = "interpreted_string_open"
+ KindNameRawStringBody = "raw_string_body"
+ KindNameRawStringClose = "raw_string_close"
+ KindNameInterpretedSeq = "interpreted_seq"
+ KindNameCodepointPrefix = "codepoint_prefix"
+ KindNameLBrace = "l_brace"
+ KindNameRBrace = "r_brace"
+ KindNameHexDigits = "hex_digits"
+ KindNameEscapedSeq = "escaped_seq"
+ KindNameEscapeChar = "escape_char"
+ KindNameInterpretedStringClose = "interpreted_string_close"
+)
+
+// KindIDToName converts a kind ID to a name.
+func KindIDToName(id KindID) string {
+ switch id {
+ case KindIDNil:
+ return KindNameNil
+ case KindIDWs:
+ return KindNameWs
+ case KindIDLParen:
+ return KindNameLParen
+ case KindIDRParen:
+ return KindNameRParen
+ case KindIDIdentifier:
+ return KindNameIdentifier
+ case KindIDRawStringOpen:
+ return KindNameRawStringOpen
+ case KindIDInterpretedStringOpen:
+ return KindNameInterpretedStringOpen
+ case KindIDRawStringBody:
+ return KindNameRawStringBody
+ case KindIDRawStringClose:
+ return KindNameRawStringClose
+ case KindIDInterpretedSeq:
+ return KindNameInterpretedSeq
+ case KindIDCodepointPrefix:
+ return KindNameCodepointPrefix
+ case KindIDLBrace:
+ return KindNameLBrace
+ case KindIDRBrace:
+ return KindNameRBrace
+ case KindIDHexDigits:
+ return KindNameHexDigits
+ case KindIDEscapedSeq:
+ return KindNameEscapedSeq
+ case KindIDEscapeChar:
+ return KindNameEscapeChar
+ case KindIDInterpretedStringClose:
+ return KindNameInterpretedStringClose
+ }
+ return ""
+}
+
+type lexSpec struct {
+ pop [][]bool
+ push [][]ModeID
+ modeNames []string
+ initialStates []StateID
+ acceptances [][]ModeKindID
+ kindIDs [][]KindID
+ kindNames []string
+ initialModeID ModeID
+ modeIDNil ModeID
+ modeKindIDNil ModeKindID
+ stateIDNil StateID
+
+ rowNums [][]int
+ rowDisplacements [][]int
+ bounds [][]int
+ entries [][]StateID
+ originalColCounts []int
+}
+
+func NewLexSpec() *lexSpec {
+ return &lexSpec{
+ pop: [][]bool{
+ nil,
+ {
+ false, false, false, false, false, false, false,
+ },
+ {
+ false, false, true,
+ },
+ {
+ false, false, false, false, false, false, false, false, true,
+ },
+ },
+ push: [][]ModeID{
+ nil,
+ {
+ 0, 0, 0, 0, 0, 2, 3,
+ },
+ {
+ 0, 0, 0,
+ },
+ {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ },
+ },
+ modeNames: []string{
+ ModeNameNil,
+ ModeNameDefault,
+ ModeNameRawString,
+ ModeNameInterpretedString,
+ },
+ initialStates: []StateID{
+ 0,
+ 1,
+ 1,
+ 1,
+ },
+ acceptances: [][]ModeKindID{
+ nil,
+ {
+ 0, 0, 1, 4, 2, 3, 5, 6,
+ },
+ {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2,
+ },
+ {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7,
+ 5, 2, 3, 4, 6, 8,
+ },
+ },
+ kindIDs: [][]KindID{
+ nil,
+ {
+ KindIDNil,
+ KindIDWs,
+ KindIDLParen,
+ KindIDRParen,
+ KindIDIdentifier,
+ KindIDRawStringOpen,
+ KindIDInterpretedStringOpen,
+ },
+ {
+ KindIDNil,
+ KindIDRawStringBody,
+ KindIDRawStringClose,
+ },
+ {
+ KindIDNil,
+ KindIDInterpretedSeq,
+ KindIDCodepointPrefix,
+ KindIDLBrace,
+ KindIDRBrace,
+ KindIDHexDigits,
+ KindIDEscapedSeq,
+ KindIDEscapeChar,
+ KindIDInterpretedStringClose,
+ },
+ },
+ kindNames: []string{
+ KindNameNil,
+ KindNameWs,
+ KindNameLParen,
+ KindNameRParen,
+ KindNameIdentifier,
+ KindNameRawStringOpen,
+ KindNameInterpretedStringOpen,
+ KindNameRawStringBody,
+ KindNameRawStringClose,
+ KindNameInterpretedSeq,
+ KindNameCodepointPrefix,
+ KindNameLBrace,
+ KindNameRBrace,
+ KindNameHexDigits,
+ KindNameEscapedSeq,
+ KindNameEscapeChar,
+ KindNameInterpretedStringClose,
+ },
+ initialModeID: ModeIDDefault,
+ modeIDNil: ModeIDNil,
+ modeKindIDNil: 0,
+ stateIDNil: 0,
+
+ rowNums: [][]int{
+ nil,
+ {
+ 0, 1, 2, 3, 0, 0, 0, 0,
+ },
+ {
+ 0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2,
+ 13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 0,
+ },
+ {
+ 0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2,
+ 13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 24,
+ 25, 0, 0, 0, 0, 0,
+ },
+ },
+ rowDisplacements: [][]int{
+ nil,
+ {
+ 0, 0, 189, 75,
+ },
+ {
+ 0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1355, 682, 245, 1259, 746, 1323, 810, 1162, 874,
+ 938, 1002, 1371, 1066,
+ },
+ {
+ 0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1436, 682, 245, 1259, 746, 1323, 810, 1162, 874,
+ 938, 1002, 1452, 1066, 1504, 1435,
+ },
+ },
+ bounds: [][]int{
+ nil,
+ {
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1,
+ 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1,
+ -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, -1, -1, -1, -1, -1, -1, -1,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, -1, -1, -1, -1, 3, -1, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2,
+ -1, -1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1,
+ },
+ {
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, -1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, -1, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+ 17, 17, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, -1, 14,
+ 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+ 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 22,
+ 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1,
+ },
+ {
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+ 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 27, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 37,
+ 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0,
+ },
+ {
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 45, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 20, 20,
+ 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 39, 20, 20, 20, 20, 40, 40, 40,
+ 40, 40, 40, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 42, 20, 43, 20, 20, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 7, 9, 9,
+ 11, 14, 14, 14, 17, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 20, 20, 20, 20, 20, 20, 20, 0, 0, 0, 0, 0, 0, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 20, 20,
+ 20, 20, 0, 0, 0, 0, 0, 0, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 0, 20, 0, 20, 20, 0, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+ 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 0, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
+ 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+ 24, 24, 26, 28, 28, 30, 33, 33, 33, 36, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+ 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+ 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 13, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+ 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+ 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 25, 25, 25, 25, 25, 25,
+ 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+ 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+ 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 29, 29,
+ 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+ 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+ 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+ 29, 29, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
+ 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
+ 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34,
+ 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
+ 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
+ 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35,
+ 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 38, 38, 38, 38, 38, 38,
+ 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+ 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+ 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+ 12, 12, 12, 12, 12, 12, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
+ 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
+ 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
+ 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+ 27, 27, 27, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 0, 0, 0, 0, 0, 0, 0,
+ 40, 40, 40, 40, 40, 40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, 40, 40, 40, 40, 40, 44, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
+ 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 44, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ },
+ },
+ originalColCounts: nil,
+ }
+}
+
+func (s *lexSpec) InitialMode() ModeID {
+ return s.initialModeID
+}
+
+func (s *lexSpec) Pop(mode ModeID, modeKind ModeKindID) bool {
+ return s.pop[mode][modeKind]
+}
+
+func (s *lexSpec) Push(mode ModeID, modeKind ModeKindID) (ModeID, bool) {
+ id := s.push[mode][modeKind]
+ return id, id != s.modeIDNil
+}
+
+func (s *lexSpec) ModeName(mode ModeID) string {
+ return s.modeNames[mode]
+}
+
+func (s *lexSpec) InitialState(mode ModeID) StateID {
+ return s.initialStates[mode]
+}
+
+func (s *lexSpec) NextState(mode ModeID, state StateID, v int) (StateID, bool) {
+ rowNum := s.rowNums[mode][state]
+ d := s.rowDisplacements[mode][rowNum]
+ if s.bounds[mode][d+v] != rowNum {
+ return s.stateIDNil, false
+ }
+ return s.entries[mode][d+v], true
+}
+
+func (s *lexSpec) Accept(mode ModeID, state StateID) (ModeKindID, bool) {
+ id := s.acceptances[mode][state]
+ return id, id != s.modeKindIDNil
+}
+
+func (s *lexSpec) KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string) {
+ id := s.kindIDs[mode][modeKind]
+ return id, s.kindNames[id]
+}
diff --git a/src/urubu/spec/test/tree_parser.go b/src/urubu/spec/test/tree_parser.go
new file mode 100644
index 0000000..528d259
--- /dev/null
+++ b/src/urubu/spec/test/tree_parser.go
@@ -0,0 +1,716 @@
+// Code generated by vartan-go. DO NOT EDIT.
+package test
+
+import (
+ "fmt"
+ "io"
+)
+
+type Grammar interface {
+ // InitialState returns the initial state of a parser.
+ InitialState() int
+
+ // StartProduction returns the start production of grammar.
+ StartProduction() int
+
+ // Action returns an ACTION entry corresponding to a (state, terminal symbol) pair.
+ Action(state int, terminal int) int
+
+ // GoTo returns a GOTO entry corresponding to a (state, non-terminal symbol) pair.
+ GoTo(state int, lhs int) int
+
+ // ErrorTrapperState returns true when a state can shift the error symbol.
+ ErrorTrapperState(state int) bool
+
+ // LHS returns a LHS symbol of a production.
+ LHS(prod int) int
+
+ // AlternativeSymbolCount returns a symbol count of p production.
+ AlternativeSymbolCount(prod int) int
+
+ // RecoverProduction returns true when a production has the recover directive.
+ RecoverProduction(prod int) bool
+
+ // NonTerminal retuns a string representaion of a non-terminal symbol.
+ NonTerminal(nonTerminal int) string
+
+ // TerminalCount returns a terminal symbol count of grammar.
+ TerminalCount() int
+
+ // SkipTerminal returns true when a terminal symbol must be skipped on syntax analysis.
+ SkipTerminal(terminal int) bool
+
+ // EOF returns the EOF symbol.
+ EOF() int
+
+ // Error returns the error symbol.
+ Error() int
+
+ // Terminal retuns a string representaion of a terminal symbol.
+ Terminal(terminal int) string
+
+ // ASTAction returns an AST action entries.
+ ASTAction(prod int) []int
+}
+
+type VToken interface {
+ // TerminalID returns a terminal ID.
+ TerminalID() int
+
+ // Lexeme returns a lexeme.
+ Lexeme() []byte
+
+ // EOF returns true when a token represents EOF.
+ EOF() bool
+
+ // Invalid returns true when a token is invalid.
+ Invalid() bool
+
+ // Position returns (row, column) pair.
+ Position() (int, int)
+}
+
+type TokenStream interface {
+ Next() (VToken, error)
+}
+
+type SyntaxError struct {
+ Row int
+ Col int
+ Message string
+ Token VToken
+ ExpectedTerminals []string
+}
+
+type ParserOption func(p *Parser) error
+
+// DisableLAC disables LAC (lookahead correction). LAC is enabled by default.
+func DisableLAC() ParserOption {
+ return func(p *Parser) error {
+ p.disableLAC = true
+ return nil
+ }
+}
+
+func SemanticAction(semAct SemanticActionSet) ParserOption {
+ return func(p *Parser) error {
+ p.semAct = semAct
+ return nil
+ }
+}
+
+type Parser struct {
+ toks TokenStream
+ gram Grammar
+ stateStack *stateStack
+ semAct SemanticActionSet
+ disableLAC bool
+ onError bool
+ shiftCount int
+ synErrs []*SyntaxError
+}
+
+func NewParser(toks TokenStream, gram Grammar, opts ...ParserOption) (*Parser, error) {
+ p := &Parser{
+ toks: toks,
+ gram: gram,
+ stateStack: &stateStack{},
+ }
+
+ for _, opt := range opts {
+ err := opt(p)
+ if err != nil {
+ return nil, err
+ }
+ }
+
+ return p, nil
+}
+
+func (p *Parser) Parse() error {
+ p.stateStack.push(p.gram.InitialState())
+ tok, err := p.nextToken()
+ if err != nil {
+ return err
+ }
+
+ACTION_LOOP:
+ for {
+ act := p.lookupAction(tok)
+
+ switch {
+ case act < 0: // Shift
+ nextState := act * -1
+
+ recovered := false
+ if p.onError {
+ p.shiftCount++
+
+ // When the parser performs shift three times, the parser recovers from the error state.
+ if p.shiftCount >= 3 {
+ p.onError = false
+ p.shiftCount = 0
+ recovered = true
+ }
+ }
+
+ p.shift(nextState)
+
+ if p.semAct != nil {
+ p.semAct.Shift(tok, recovered)
+ }
+
+ tok, err = p.nextToken()
+ if err != nil {
+ return err
+ }
+ case act > 0: // Reduce
+ prodNum := act
+
+ recovered := false
+ if p.onError && p.gram.RecoverProduction(prodNum) {
+ p.onError = false
+ p.shiftCount = 0
+ recovered = true
+ }
+
+ accepted := p.reduce(prodNum)
+ if accepted {
+ if p.semAct != nil {
+ p.semAct.Accept()
+ }
+
+ return nil
+ }
+
+ if p.semAct != nil {
+ p.semAct.Reduce(prodNum, recovered)
+ }
+ default: // Error
+ if p.onError {
+ tok, err = p.nextToken()
+ if err != nil {
+ return err
+ }
+ if tok.EOF() {
+ if p.semAct != nil {
+ p.semAct.MissError(tok)
+ }
+
+ return nil
+ }
+
+ continue ACTION_LOOP
+ }
+
+ row, col := tok.Position()
+ p.synErrs = append(p.synErrs, &SyntaxError{
+ Row: row,
+ Col: col,
+ Message: "unexpected token",
+ Token: tok,
+ ExpectedTerminals: p.searchLookahead(p.stateStack.top()),
+ })
+
+ count, ok := p.trapError()
+ if !ok {
+ if p.semAct != nil {
+ p.semAct.MissError(tok)
+ }
+
+ return nil
+ }
+
+ p.onError = true
+ p.shiftCount = 0
+
+ act, err := p.lookupActionOnError()
+ if err != nil {
+ return err
+ }
+
+ p.shift(act * -1)
+
+ if p.semAct != nil {
+ p.semAct.TrapAndShiftError(tok, count)
+ }
+ }
+ }
+}
+
+// validateLookahead validates whether `term` is a valid lookahead in the current context. When `term` is valid,
+// this method returns `true`.
+func (p *Parser) validateLookahead(term int) bool {
+ p.stateStack.enableExploratoryMode()
+ defer p.stateStack.disableExploratoryMode()
+
+ for {
+ act := p.gram.Action(p.stateStack.topExploratorily(), term)
+
+ switch {
+ case act < 0: // Shift
+ return true
+ case act > 0: // Reduce
+ prodNum := act
+
+ lhs := p.gram.LHS(prodNum)
+ if lhs == p.gram.LHS(p.gram.StartProduction()) {
+ return true
+ }
+ n := p.gram.AlternativeSymbolCount(prodNum)
+ p.stateStack.popExploratorily(n)
+ state := p.gram.GoTo(p.stateStack.topExploratorily(), lhs)
+ p.stateStack.pushExploratorily(state)
+ default: // Error
+ return false
+ }
+ }
+}
+
+func (p *Parser) nextToken() (VToken, error) {
+ for {
+ // We don't have to check whether the token is invalid because the kind ID of the invalid token is 0,
+ // and the parsing table doesn't have an entry corresponding to the kind ID 0. Thus we can detect
+ // a syntax error because the parser cannot find an entry corresponding to the invalid token.
+ tok, err := p.toks.Next()
+ if err != nil {
+ return nil, err
+ }
+
+ if p.gram.SkipTerminal(tok.TerminalID()) {
+ continue
+ }
+
+ return tok, nil
+ }
+}
+
+func (p *Parser) tokenToTerminal(tok VToken) int {
+ if tok.EOF() {
+ return p.gram.EOF()
+ }
+
+ return tok.TerminalID()
+}
+
+func (p *Parser) lookupAction(tok VToken) int {
+ if !p.disableLAC {
+ term := p.tokenToTerminal(tok)
+ if !p.validateLookahead(term) {
+ return 0
+ }
+ }
+
+ return p.gram.Action(p.stateStack.top(), p.tokenToTerminal(tok))
+}
+
+func (p *Parser) lookupActionOnError() (int, error) {
+ act := p.gram.Action(p.stateStack.top(), p.gram.Error())
+ if act >= 0 {
+ return 0, fmt.Errorf("an entry must be a shift action by the error symbol; entry: %v, state: %v, symbol: %v", act, p.stateStack.top(), p.gram.Terminal(p.gram.Error()))
+ }
+
+ return act, nil
+}
+
+func (p *Parser) shift(nextState int) {
+ p.stateStack.push(nextState)
+}
+
+func (p *Parser) reduce(prodNum int) bool {
+ lhs := p.gram.LHS(prodNum)
+ if lhs == p.gram.LHS(p.gram.StartProduction()) {
+ return true
+ }
+ n := p.gram.AlternativeSymbolCount(prodNum)
+ p.stateStack.pop(n)
+ nextState := p.gram.GoTo(p.stateStack.top(), lhs)
+ p.stateStack.push(nextState)
+ return false
+}
+
+func (p *Parser) trapError() (int, bool) {
+ count := 0
+ for {
+ if p.gram.ErrorTrapperState(p.stateStack.top()) {
+ return count, true
+ }
+
+ if p.stateStack.top() != p.gram.InitialState() {
+ p.stateStack.pop(1)
+ count++
+ } else {
+ return 0, false
+ }
+ }
+}
+
+func (p *Parser) SyntaxErrors() []*SyntaxError {
+ return p.synErrs
+}
+
+func (p *Parser) searchLookahead(state int) []string {
+ kinds := []string{}
+ termCount := p.gram.TerminalCount()
+ for term := 0; term < termCount; term++ {
+ if p.disableLAC {
+ if p.gram.Action(p.stateStack.top(), term) == 0 {
+ continue
+ }
+ } else {
+ if !p.validateLookahead(term) {
+ continue
+ }
+ }
+
+ // We don't add the error symbol to the look-ahead symbols because users cannot input the error symbol
+ // intentionally.
+ if term == p.gram.Error() {
+ continue
+ }
+
+ kinds = append(kinds, p.gram.Terminal(term))
+ }
+
+ return kinds
+}
+
+type stateStack struct {
+ items []int
+ itemsExp []int
+}
+
+func (s *stateStack) enableExploratoryMode() {
+ s.itemsExp = make([]int, len(s.items))
+ copy(s.itemsExp, s.items)
+}
+
+func (s *stateStack) disableExploratoryMode() {
+ s.itemsExp = nil
+}
+
+func (s *stateStack) top() int {
+ return s.items[len(s.items)-1]
+}
+
+func (s *stateStack) topExploratorily() int {
+ return s.itemsExp[len(s.itemsExp)-1]
+}
+
+func (s *stateStack) push(state int) {
+ s.items = append(s.items, state)
+}
+
+func (s *stateStack) pushExploratorily(state int) {
+ s.itemsExp = append(s.itemsExp, state)
+}
+
+func (s *stateStack) pop(n int) {
+ s.items = s.items[:len(s.items)-n]
+}
+
+func (s *stateStack) popExploratorily(n int) {
+ s.itemsExp = s.itemsExp[:len(s.itemsExp)-n]
+}
+
+type grammarImpl struct {
+ recoverProductions []int
+ action []int
+ goTo []int
+ alternativeSymbolCounts []int
+ errorTrapperStates []int
+ nonTerminals []string
+ lhsSymbols []int
+ terminals []string
+ terminalSkip []int
+ astActions [][]int
+}
+
+func NewGrammar() *grammarImpl {
+ return &grammarImpl{
+ recoverProductions: []int{
+ 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0,
+ },
+ action: []int{
+ 0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ -3, 0, 0, 0, -4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, -5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0,
+ -2, 7, 0, -11, 0, 0, -12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 4,
+ 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 6,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -2, -14, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -15, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 12, 12, 0, 0, -17, 12, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, -22, 0, 16, 16, 0, 0, 0, 0, 0, -23,
+ -24, -25, -26, -27, -28, -29, 16, 0, 0, 0, 0, 5, 5, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 3, 0, 0, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -30, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ -31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -23, -24, -25, -26, -27, -28, -29, 15,
+ 0, 18, 0, 0, 18, 18, 0, 0, 0, 0, 0, 18, 18, 18, 18, 18, 18, 18, 18, 0,
+ 25, 0, 0, 25, 25, 0, 0, 0, 0, 0, 25, 25, 25, 25, 25, 25, 25, 25, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -33, 0, 19, 0,
+ 0, 19, 19, 0, 0, 0, 0, 0, 19, 19, 19, 19, 19, 19, 19, 19, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, -34, 0, 0, 0, 0, 0, 0, 20, 0, 0, 20,
+ 20, 0, 0, 0, 0, 0, 20, 20, 20, 20, 20, 20, 20, 20, 0, 21, 0, 0, 21, 21,
+ 0, 0, 0, 0, 0, 21, 21, 21, 21, 21, 21, 21, 21, 0, 22, 0, 0, 22, 22, 0,
+ 0, 0, 0, 0, 22, 22, 22, 22, 22, 22, 22, 22, 0, 23, 0, 0, 23, 23, 0, 0,
+ 0, 0, 0, 23, 23, 23, 23, 23, 23, 23, 23, 0, 24, 0, 0, 24, 24, 0, 0, 0,
+ 0, 0, 24, 24, 24, 24, 24, 24, 24, 24, 0, 10, 0, 0, 10, 10, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 0, 0, 13, 13, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 17, 0, 0, 17, 17, 0, 0, 0, 0, 0, 17,
+ 17, 17, 17, 17, 17, 17, 17, 0, 14, 0, 0, 14, 14, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, -35, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -36,
+ 0, 0, 0, 0, 0, 26, 0, 0, 26, 26, 0, 0, 0, 0, 0, 26, 26, 26, 26, 26,
+ 26, 26, 26,
+ },
+ goTo: []int{
+ 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 7, 8, 9, 0, 10, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 19, 20, 21, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 21,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ },
+ alternativeSymbolCounts: []int{
+ 0, 1, 4, 4, 3, 2, 1, 0, 1, 1, 3, 1, 0, 3, 3, 1, 0, 2, 1, 1,
+ 1, 1, 1, 1, 1, 1, 4,
+ },
+ errorTrapperStates: []int{
+ 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ },
+ nonTerminals: []string{
+ "",
+ "tree'",
+ "tree",
+ "tree_list",
+ "string",
+ "raw_string",
+ "opt_raw_string_body",
+ "interpreted_string",
+ "opt_interpreted_string_body",
+ "interpreted_string_body",
+ "interpreted_string_elem",
+ "codepoint_expr",
+ },
+ lhsSymbols: []int{
+ 0, 1, 2, 2, 2, 3, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10,
+ 10, 10, 10, 10, 10, 10, 11,
+ },
+ terminals: []string{
+ "",
+ "<eof>",
+ "error",
+ "ws",
+ "l_paren",
+ "r_paren",
+ "identifier",
+ "raw_string_open",
+ "raw_string_body",
+ "raw_string_close",
+ "interpreted_string_open",
+ "interpreted_seq",
+ "codepoint_prefix",
+ "l_brace",
+ "r_brace",
+ "hex_digits",
+ "escaped_seq",
+ "escape_char",
+ "interpreted_string_close",
+ },
+ terminalSkip: []int{
+ 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ },
+ astActions: [][]int{
+ nil,
+ nil,
+ {
+ 2, -3,
+ },
+ {
+ 2, 3,
+ },
+ {
+ 2,
+ },
+ {
+ -1, 2,
+ },
+ nil,
+ nil,
+ nil,
+ nil,
+ {
+ -2,
+ },
+ nil,
+ nil,
+ {
+ -2,
+ },
+ {
+ 2,
+ },
+ {
+ -1,
+ },
+ nil,
+ {
+ -1, -2,
+ },
+ {
+ -1,
+ },
+ nil,
+ nil,
+ nil,
+ nil,
+ nil,
+ nil,
+ nil,
+ {
+ 3,
+ },
+ },
+ }
+}
+
+func (g *grammarImpl) InitialState() int {
+ return 0
+}
+
+func (g *grammarImpl) StartProduction() int {
+ return 1
+}
+
+func (g *grammarImpl) RecoverProduction(prod int) bool {
+ return g.recoverProductions[prod] != 0
+}
+
+func (g *grammarImpl) Action(state int, terminal int) int {
+ return g.action[state*19+terminal]
+}
+
+func (g *grammarImpl) GoTo(state int, lhs int) int {
+ return g.goTo[state*12+lhs]
+}
+
+func (g *grammarImpl) AlternativeSymbolCount(prod int) int {
+ return g.alternativeSymbolCounts[prod]
+}
+
+func (g *grammarImpl) TerminalCount() int {
+ return 19
+}
+
+func (g *grammarImpl) SkipTerminal(terminal int) bool {
+ return g.terminalSkip[terminal] == 1
+}
+
+func (g *grammarImpl) ErrorTrapperState(state int) bool {
+ return g.errorTrapperStates[state] != 0
+}
+
+func (g *grammarImpl) NonTerminal(nonTerminal int) string {
+ return g.nonTerminals[nonTerminal]
+}
+
+func (g *grammarImpl) LHS(prod int) int {
+ return g.lhsSymbols[prod]
+}
+
+func (g *grammarImpl) EOF() int {
+ return 1
+}
+
+func (g *grammarImpl) Error() int {
+ return 2
+}
+
+func (g *grammarImpl) Terminal(terminal int) string {
+ return g.terminals[terminal]
+}
+
+func (g *grammarImpl) ASTAction(prod int) []int {
+ return g.astActions[prod]
+}
+
+type vToken struct {
+ terminalID int
+ tok *Token
+}
+
+func (t *vToken) TerminalID() int {
+ return t.terminalID
+}
+
+func (t *vToken) Lexeme() []byte {
+ return t.tok.Lexeme
+}
+
+func (t *vToken) EOF() bool {
+ return t.tok.EOF
+}
+
+func (t *vToken) Invalid() bool {
+ return t.tok.Invalid
+}
+
+func (t *vToken) Position() (int, int) {
+ return t.tok.Row, t.tok.Col
+}
+
+var kindToTerminal = []int{
+ 0, 3, 4, 5, 6, 7, 10, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18,
+}
+
+type tokenStream struct {
+ lex *Lexer
+ kindToTerminal []int
+}
+
+func NewTokenStream(src io.Reader) (*tokenStream, error) {
+ lex, err := NewLexer(NewLexSpec(), src)
+ if err != nil {
+ return nil, err
+ }
+
+ return &tokenStream{
+ lex: lex,
+ }, nil
+}
+
+func (t *tokenStream) Next() (VToken, error) {
+ tok, err := t.lex.Next()
+ if err != nil {
+ return nil, err
+ }
+ return &vToken{
+ terminalID: kindToTerminal[tok.KindID],
+ tok: tok,
+ }, nil
+}
diff --git a/src/urubu/spec/test/tree_semantic_action.go b/src/urubu/spec/test/tree_semantic_action.go
new file mode 100644
index 0000000..c1d5a25
--- /dev/null
+++ b/src/urubu/spec/test/tree_semantic_action.go
@@ -0,0 +1,367 @@
+// Code generated by vartan-go. DO NOT EDIT.
+package test
+
+import (
+ "encoding/json"
+ "fmt"
+ "io"
+ "strconv"
+)
+
+// SemanticActionSet is a set of semantic actions a parser calls.
+type SemanticActionSet interface {
+ // Shift runs when the parser shifts a symbol onto a state stack. `tok` is a token corresponding to the symbol.
+ // When the parser recovered from an error state by shifting the token, `recovered` is true.
+ Shift(tok VToken, recovered bool)
+
+ // Reduce runs when the parser reduces an RHS of a production to its LHS. `prodNum` is a number of the production.
+ // When the parser recovered from an error state by reducing the production, `recovered` is true.
+ Reduce(prodNum int, recovered bool)
+
+ // Accept runs when the parser accepts an input.
+ Accept()
+
+ // TrapAndShiftError runs when the parser traps a syntax error and shifts a error symbol onto the state stack.
+ // `cause` is a token that caused a syntax error. `popped` is the number of frames that the parser discards
+ // from the state stack.
+ // Unlike `Shift` function, this function doesn't take a token to be shifted as an argument because a token
+ // corresponding to the error symbol doesn't exist.
+ TrapAndShiftError(cause VToken, popped int)
+
+ // MissError runs when the parser fails to trap a syntax error. `cause` is a token that caused a syntax error.
+ MissError(cause VToken)
+}
+
+var _ SemanticActionSet = &SyntaxTreeActionSet{}
+
+// SyntaxTreeNode is a node of a syntax tree. A node type used in SyntaxTreeActionSet must implement SyntaxTreeNode interface.
+type SyntaxTreeNode interface {
+ // ChildCount returns a child count of a node. A parser calls this method to know the child count to be expanded by an `#ast`
+ // directive with `...` operator.
+ ChildCount() int
+
+ // ExpandChildren returns children of a node. A parser calls this method to fetch the children to be expanded by an `#ast`
+ // directive with `...` operator.
+ ExpandChildren() []SyntaxTreeNode
+}
+
+var _ SyntaxTreeNode = &Node{}
+
+// SyntaxTreeBuilder allows you to construct a syntax tree containing arbitrary user-defined node types.
+// The parser uses SyntaxTreeBuilder interface as a part of semantic actions via SyntaxTreeActionSet interface.
+type SyntaxTreeBuilder interface {
+ Shift(kindName string, text string, row, col int) SyntaxTreeNode
+ ShiftError(kindName string) SyntaxTreeNode
+ Reduce(kindName string, children []SyntaxTreeNode) SyntaxTreeNode
+ Accept(f SyntaxTreeNode)
+}
+
+var _ SyntaxTreeBuilder = &DefaulSyntaxTreeBuilder{}
+
+// DefaulSyntaxTreeBuilder is a implementation of SyntaxTreeBuilder.
+type DefaulSyntaxTreeBuilder struct {
+ tree *Node
+}
+
+// NewDefaultSyntaxTreeBuilder returns a new DefaultSyntaxTreeBuilder.
+func NewDefaultSyntaxTreeBuilder() *DefaulSyntaxTreeBuilder {
+ return &DefaulSyntaxTreeBuilder{}
+}
+
+// Shift is a implementation of SyntaxTreeBuilder.Shift.
+func (b *DefaulSyntaxTreeBuilder) Shift(kindName string, text string, row, col int) SyntaxTreeNode {
+ return &Node{
+ Type: NodeTypeTerminal,
+ KindName: kindName,
+ Text: text,
+ Row: row,
+ Col: col,
+ }
+}
+
+// ShiftError is a implementation of SyntaxTreeBuilder.ShiftError.
+func (b *DefaulSyntaxTreeBuilder) ShiftError(kindName string) SyntaxTreeNode {
+ return &Node{
+ Type: NodeTypeError,
+ KindName: kindName,
+ }
+}
+
+// Reduce is a implementation of SyntaxTreeBuilder.Reduce.
+func (b *DefaulSyntaxTreeBuilder) Reduce(kindName string, children []SyntaxTreeNode) SyntaxTreeNode {
+ cNodes := make([]*Node, len(children))
+ for i, c := range children {
+ cNodes[i] = c.(*Node)
+ }
+ return &Node{
+ Type: NodeTypeNonTerminal,
+ KindName: kindName,
+ Children: cNodes,
+ }
+}
+
+// Accept is a implementation of SyntaxTreeBuilder.Accept.
+func (b *DefaulSyntaxTreeBuilder) Accept(f SyntaxTreeNode) {
+ b.tree = f.(*Node)
+}
+
+// Tree returns a syntax tree when the parser has accepted an input. If a syntax error occurs, the return value is nil.
+func (b *DefaulSyntaxTreeBuilder) Tree() *Node {
+ return b.tree
+}
+
+// SyntaxTreeActionSet is a implementation of SemanticActionSet interface and constructs a syntax tree.
+type SyntaxTreeActionSet struct {
+ gram Grammar
+ builder SyntaxTreeBuilder
+ semStack *semanticStack
+ disableASTAction bool
+}
+
+// NewASTActionSet returns a new SyntaxTreeActionSet that constructs an AST (Abstract Syntax Tree).
+// When grammar `gram` contains `#ast` directives, the new SyntaxTreeActionSet this function returns interprets them.
+func NewASTActionSet(gram Grammar, builder SyntaxTreeBuilder) *SyntaxTreeActionSet {
+ return &SyntaxTreeActionSet{
+ gram: gram,
+ builder: builder,
+ semStack: newSemanticStack(),
+ }
+}
+
+// NewCSTTActionSet returns a new SyntaxTreeActionSet that constructs a CST (Concrete Syntax Tree).
+// Even if grammar `gram` contains `#ast` directives, the new SyntaxTreeActionSet this function returns ignores them.
+func NewCSTActionSet(gram Grammar, builder SyntaxTreeBuilder) *SyntaxTreeActionSet {
+ return &SyntaxTreeActionSet{
+ gram: gram,
+ builder: builder,
+ semStack: newSemanticStack(),
+ disableASTAction: true,
+ }
+}
+
+// Shift is a implementation of SemanticActionSet.Shift method.
+func (a *SyntaxTreeActionSet) Shift(tok VToken, recovered bool) {
+ term := a.tokenToTerminal(tok)
+ row, col := tok.Position()
+ a.semStack.push(a.builder.Shift(a.gram.Terminal(term), string(tok.Lexeme()), row, col))
+}
+
+// Reduce is a implementation of SemanticActionSet.Reduce method.
+func (a *SyntaxTreeActionSet) Reduce(prodNum int, recovered bool) {
+ lhs := a.gram.LHS(prodNum)
+
+ // When an alternative is empty, `n` will be 0, and `handle` will be empty slice.
+ n := a.gram.AlternativeSymbolCount(prodNum)
+ handle := a.semStack.pop(n)
+
+ var astAct []int
+ if !a.disableASTAction {
+ astAct = a.gram.ASTAction(prodNum)
+ }
+ var children []SyntaxTreeNode
+ if astAct != nil {
+ // Count the number of children in advance to avoid frequent growth in a slice for children.
+ {
+ l := 0
+ for _, e := range astAct {
+ if e > 0 {
+ l++
+ } else {
+ offset := e*-1 - 1
+ l += handle[offset].ChildCount()
+ }
+ }
+
+ children = make([]SyntaxTreeNode, l)
+ }
+
+ p := 0
+ for _, e := range astAct {
+ if e > 0 {
+ offset := e - 1
+ children[p] = handle[offset]
+ p++
+ } else {
+ offset := e*-1 - 1
+ for _, c := range handle[offset].ExpandChildren() {
+ children[p] = c
+ p++
+ }
+ }
+ }
+ } else {
+ // If an alternative has no AST action, a driver generates
+ // a node with the same structure as a CST.
+ children = handle
+ }
+
+ a.semStack.push(a.builder.Reduce(a.gram.NonTerminal(lhs), children))
+}
+
+// Accept is a implementation of SemanticActionSet.Accept method.
+func (a *SyntaxTreeActionSet) Accept() {
+ top := a.semStack.pop(1)
+ a.builder.Accept(top[0])
+}
+
+// TrapAndShiftError is a implementation of SemanticActionSet.TrapAndShiftError method.
+func (a *SyntaxTreeActionSet) TrapAndShiftError(cause VToken, popped int) {
+ a.semStack.pop(popped)
+ a.semStack.push(a.builder.ShiftError(a.gram.Terminal(a.gram.Error())))
+}
+
+// MissError is a implementation of SemanticActionSet.MissError method.
+func (a *SyntaxTreeActionSet) MissError(cause VToken) {
+}
+
+func (a *SyntaxTreeActionSet) tokenToTerminal(tok VToken) int {
+ if tok.EOF() {
+ return a.gram.EOF()
+ }
+
+ return tok.TerminalID()
+}
+
+type semanticStack struct {
+ frames []SyntaxTreeNode
+}
+
+func newSemanticStack() *semanticStack {
+ return &semanticStack{
+ frames: make([]SyntaxTreeNode, 0, 100),
+ }
+}
+
+func (s *semanticStack) push(f SyntaxTreeNode) {
+ s.frames = append(s.frames, f)
+}
+
+func (s *semanticStack) pop(n int) []SyntaxTreeNode {
+ fs := s.frames[len(s.frames)-n:]
+ s.frames = s.frames[:len(s.frames)-n]
+
+ return fs
+}
+
+type NodeType int
+
+const (
+ NodeTypeError = 0
+ NodeTypeTerminal = 1
+ NodeTypeNonTerminal = 2
+)
+
+// Node is a implementation of SyntaxTreeNode interface.
+type Node struct {
+ Type NodeType
+ KindName string
+ Text string
+ Row int
+ Col int
+ Children []*Node
+}
+
+func (n *Node) MarshalJSON() ([]byte, error) {
+ switch n.Type {
+ case NodeTypeError:
+ return json.Marshal(struct {
+ Type NodeType `json:"type"`
+ KindName string `json:"kind_name"`
+ }{
+ Type: n.Type,
+ KindName: n.KindName,
+ })
+ case NodeTypeTerminal:
+ if n.KindName == "" {
+ return json.Marshal(struct {
+ Type NodeType `json:"type"`
+ Text string `json:"text"`
+ Row int `json:"row"`
+ Col int `json:"col"`
+ }{
+ Type: n.Type,
+ Text: n.Text,
+ Row: n.Row,
+ Col: n.Col,
+ })
+ }
+ return json.Marshal(struct {
+ Type NodeType `json:"type"`
+ KindName string `json:"kind_name"`
+ Text string `json:"text"`
+ Row int `json:"row"`
+ Col int `json:"col"`
+ }{
+ Type: n.Type,
+ KindName: n.KindName,
+ Text: n.Text,
+ Row: n.Row,
+ Col: n.Col,
+ })
+ case NodeTypeNonTerminal:
+ return json.Marshal(struct {
+ Type NodeType `json:"type"`
+ KindName string `json:"kind_name"`
+ Children []*Node `json:"children"`
+ }{
+ Type: n.Type,
+ KindName: n.KindName,
+ Children: n.Children,
+ })
+ default:
+ return nil, fmt.Errorf("invalid node type: %v", n.Type)
+ }
+}
+
+// ChildCount is a implementation of SyntaxTreeNode.ChildCount.
+func (n *Node) ChildCount() int {
+ return len(n.Children)
+}
+
+// ExpandChildren is a implementation of SyntaxTreeNode.ExpandChildren.
+func (n *Node) ExpandChildren() []SyntaxTreeNode {
+ fs := make([]SyntaxTreeNode, len(n.Children))
+ for i, n := range n.Children {
+ fs[i] = n
+ }
+ return fs
+}
+
+// PrintTree prints a syntax tree whose root is `node`.
+func PrintTree(w io.Writer, node *Node) {
+ printTree(w, node, "", "")
+}
+
+func printTree(w io.Writer, node *Node, ruledLine string, childRuledLinePrefix string) {
+ if node == nil {
+ return
+ }
+
+ switch node.Type {
+ case NodeTypeError:
+ fmt.Fprintf(w, "%v%v\n", ruledLine, node.KindName)
+ case NodeTypeTerminal:
+ fmt.Fprintf(w, "%v%v %v\n", ruledLine, node.KindName, strconv.Quote(node.Text))
+ case NodeTypeNonTerminal:
+ fmt.Fprintf(w, "%v%v\n", ruledLine, node.KindName)
+
+ num := len(node.Children)
+ for i, child := range node.Children {
+ var line string
+ if num > 1 && i < num-1 {
+ line = "├─ "
+ } else {
+ line = "└─ "
+ }
+
+ var prefix string
+ if i >= num-1 {
+ prefix = " "
+ } else {
+ prefix = "│ "
+ }
+
+ printTree(w, child, childRuledLinePrefix+line, childRuledLinePrefix+prefix)
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-13 18:31:46 +0000