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-rw-r--r--driver/conflict_test.go245
-rw-r--r--driver/parser_test.go52
-rw-r--r--grammar/grammar.go148
-rw-r--r--grammar/parsing_table.go29
-rw-r--r--grammar/semantic_error.go2
-rw-r--r--spec/clexspec.json2
-rw-r--r--spec/lexer.go3
-rw-r--r--spec/lexer_test.go3
-rw-r--r--spec/lexspec.json4
-rw-r--r--spec/parser.go57
-rw-r--r--spec/parser_test.go92
11 files changed, 632 insertions, 5 deletions
diff --git a/driver/conflict_test.go b/driver/conflict_test.go
index 750ed4e..46eeaba 100644
--- a/driver/conflict_test.go
+++ b/driver/conflict_test.go
@@ -68,6 +68,251 @@ id: "[A-Za-z0-9_]+";
),
),
},
+ {
+ caption: "left associativities defined earlier in the grammar have higher precedence",
+ specSrc: `
+%left mul
+%left add
+
+expr
+ : expr add expr
+ | expr mul expr
+ | id
+ ;
+
+id: "[A-Za-z0-9_]+";
+add: '+';
+mul: '*';
+`,
+ src: `a+b*c*d+e`,
+ cst: nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "a"),
+ ),
+ termNode("add", "+"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "b"),
+ ),
+ termNode("mul", "*"),
+ nonTermNode("expr",
+ termNode("id", "c"),
+ ),
+ ),
+ termNode("mul", "*"),
+ nonTermNode("expr",
+ termNode("id", "d"),
+ ),
+ ),
+ ),
+ termNode("add", "+"),
+ nonTermNode("expr",
+ termNode("id", "e"),
+ ),
+ ),
+ },
+ {
+ caption: "left associativities defined in the same line have the same precedence",
+ specSrc: `
+%left add sub
+
+expr
+ : expr add expr
+ | expr sub expr
+ | id
+ ;
+
+id: "[A-Za-z0-9_]+";
+add: '+';
+sub: '-';
+`,
+ src: `a-b+c+d-e`,
+ cst: nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "a"),
+ ),
+ termNode("sub", "-"),
+ nonTermNode("expr",
+ termNode("id", "b"),
+ ),
+ ),
+ termNode("add", "+"),
+ nonTermNode("expr",
+ termNode("id", "c"),
+ ),
+ ),
+ termNode("add", "+"),
+ nonTermNode("expr",
+ termNode("id", "d"),
+ ),
+ ),
+ termNode("sub", "-"),
+ nonTermNode("expr",
+ termNode("id", "e"),
+ ),
+ ),
+ },
+ {
+ caption: "right associativities defined earlier in the grammar have higher precedence",
+ specSrc: `
+%right r1
+%right r2
+
+expr
+ : expr r2 expr
+ | expr r1 expr
+ | id
+ ;
+
+whitespaces: "[\u{0009}\u{0020}]+" #skip;
+r1: 'r1';
+r2: 'r2';
+id: "[A-Za-z0-9_]+";
+`,
+ src: `a r2 b r1 c r1 d r2 e`,
+ cst: nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "a"),
+ ),
+ termNode("r2", "r2"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "b"),
+ ),
+ termNode("r1", "r1"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "c"),
+ ),
+ termNode("r1", "r1"),
+ nonTermNode("expr",
+ termNode("id", "d"),
+ ),
+ ),
+ ),
+ termNode("r2", "r2"),
+ nonTermNode("expr",
+ termNode("id", "e"),
+ ),
+ ),
+ ),
+ },
+ {
+ caption: "right associativities defined in the same line have the same precedence",
+ specSrc: `
+%right r1 r2
+
+expr
+ : expr r2 expr
+ | expr r1 expr
+ | id
+ ;
+
+whitespaces: "[\u{0009}\u{0020}]+" #skip;
+r1: 'r1';
+r2: 'r2';
+id: "[A-Za-z0-9_]+";
+`,
+ src: `a r2 b r1 c r1 d r2 e`,
+ cst: nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "a"),
+ ),
+ termNode("r2", "r2"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "b"),
+ ),
+ termNode("r1", "r1"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "c"),
+ ),
+ termNode("r1", "r1"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "d"),
+ ),
+ termNode("r2", "r2"),
+ nonTermNode("expr",
+ termNode("id", "e"),
+ ),
+ ),
+ ),
+ ),
+ ),
+ },
+ {
+ caption: "left and right associativities can be mixed",
+ specSrc: `
+%left mul div
+%left add sub
+%right assign
+
+expr
+ : expr add expr
+ | expr sub expr
+ | expr mul expr
+ | expr div expr
+ | expr assign expr
+ | id
+ ;
+
+id: "[A-Za-z0-9_]+";
+add: '+';
+sub: '-';
+mul: '*';
+div: '/';
+assign: '=';
+`,
+ src: `x=y=a+b*c-d/e`,
+ cst: nonTermNode(
+ "expr",
+ nonTermNode("expr",
+ termNode("id", "x"),
+ ),
+ termNode("assign", "="),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "y"),
+ ),
+ termNode("assign", "="),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "a"),
+ ),
+ termNode("add", "+"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "b"),
+ ),
+ termNode("mul", "*"),
+ nonTermNode("expr",
+ termNode("id", "c"),
+ ),
+ ),
+ ),
+ termNode("sub", "-"),
+ nonTermNode("expr",
+ nonTermNode("expr",
+ termNode("id", "d"),
+ ),
+ termNode("div", "/"),
+ nonTermNode("expr",
+ termNode("id", "e"),
+ ),
+ ),
+ ),
+ ),
+ ),
+ },
}
for _, tt := range tests {
diff --git a/driver/parser_test.go b/driver/parser_test.go
index d50ee85..9467d6c 100644
--- a/driver/parser_test.go
+++ b/driver/parser_test.go
@@ -395,6 +395,58 @@ b: "a";
`,
specErr: true,
},
+ // Invalid associativity type
+ {
+ specSrc: `
+%foo
+
+s
+ : a
+ ;
+
+a: 'a';
+`,
+ specErr: true,
+ },
+ // Associativity needs at least one symbol.
+ {
+ specSrc: `
+%left
+
+s
+ : a
+ ;
+
+a: 'a';
+`,
+ specErr: true,
+ },
+ // Associativity cannot take an undefined symbol.
+ {
+ specSrc: `
+%left b
+
+s
+ : a
+ ;
+
+a: 'a';
+`,
+ specErr: true,
+ },
+ // Associativity cannot take a non-terminal symbol.
+ {
+ specSrc: `
+%left s
+
+s
+ : a
+ ;
+
+a: 'a';
+`,
+ specErr: true,
+ },
}
classes := []grammar.Class{
diff --git a/grammar/grammar.go b/grammar/grammar.go
index 85eedcc..450c526 100644
--- a/grammar/grammar.go
+++ b/grammar/grammar.go
@@ -16,6 +16,58 @@ type astActionEntry struct {
expansion bool
}
+type assocType string
+
+const (
+ assocTypeNil = assocType("")
+ assocTypeLeft = assocType("left")
+ assocTypeRight = assocType("right")
+)
+
+const (
+ precNil = 0
+ precMin = 1
+)
+
+// precAndAssoc represents precedence and associativities of terminal symbols and productions.
+// We use the priority of the production to resolve shift/reduce conflicts.
+type precAndAssoc struct {
+ // termPrec represents the precedence of the terminal symbols.
+ termPrec map[symbolNum]int
+
+ // prodPrec and prodAssoc represent the precedence and the associativities of the production.
+ // These values are inherited from the right-most symbols in the RHS of the productions.
+ prodPrec map[productionNum]int
+ prodAssoc map[productionNum]assocType
+}
+
+func (pa *precAndAssoc) terminalPrecedence(sym symbolNum) int {
+ prec, ok := pa.termPrec[sym]
+ if !ok {
+ return precNil
+ }
+
+ return prec
+}
+
+func (pa *precAndAssoc) productionPredence(prod productionNum) int {
+ prec, ok := pa.prodPrec[prod]
+ if !ok {
+ return precNil
+ }
+
+ return prec
+}
+
+func (pa *precAndAssoc) productionAssociativity(prod productionNum) assocType {
+ assoc, ok := pa.prodAssoc[prod]
+ if !ok {
+ return assocTypeNil
+ }
+
+ return assoc
+}
+
type Grammar struct {
lexSpec *mlspec.LexSpec
skipLexKinds []mlspec.LexKindName
@@ -24,6 +76,7 @@ type Grammar struct {
augmentedStartSymbol symbol
symbolTable *symbolTable
astActions map[productionID][]*astActionEntry
+ precAndAssoc *precAndAssoc
}
type GrammarBuilder struct {
@@ -43,6 +96,11 @@ func (b *GrammarBuilder) Build() (*Grammar, error) {
return nil, err
}
+ pa, err := b.genPrecAndAssoc(symTabAndLexSpec.symTab, prodsAndActs.prods)
+ if err != nil {
+ return nil, err
+ }
+
syms, err := findUsedAndUnusedSymbols(b.AST)
if err != nil {
return nil, err
@@ -93,6 +151,7 @@ func (b *GrammarBuilder) Build() (*Grammar, error) {
augmentedStartSymbol: prodsAndActs.augStartSym,
symbolTable: symTabAndLexSpec.symTab,
astActions: prodsAndActs.astActs,
+ precAndAssoc: pa,
}, nil
}
@@ -130,7 +189,6 @@ func findUsedAndUnusedSymbols(root *spec.RootNode) (*usedAndUnusedSymbols, error
markUsedSymbols(mark, map[string]bool{}, prods, start)
}
- // usedProds := make(map[string]*spec.ProductionNode, len(prods))
usedTerms := make(map[string]*spec.ProductionNode, len(lexProds))
unusedProds := map[string]*spec.ProductionNode{}
unusedTerms := map[string]*spec.ProductionNode{}
@@ -605,6 +663,93 @@ func (b *GrammarBuilder) genProductionsAndActions(root *spec.RootNode, symTabAnd
}, nil
}
+func (b *GrammarBuilder) genPrecAndAssoc(symTab *symbolTable, prods *productionSet) (*precAndAssoc, error) {
+ termPrec := map[symbolNum]int{}
+ termAssoc := map[symbolNum]assocType{}
+ {
+ precN := precMin
+ for _, md := range b.AST.MetaData {
+ var assocTy assocType
+ switch md.Name {
+ case "left":
+ assocTy = assocTypeLeft
+ case "right":
+ assocTy = assocTypeRight
+ default:
+ return nil, &verr.SpecError{
+ Cause: semErrMDInvalidName,
+ Row: md.Pos.Row,
+ }
+ }
+
+ if len(md.Parameters) == 0 {
+ return nil, &verr.SpecError{
+ Cause: semErrMDInvalidParam,
+ Detail: "associativity needs at least one symbol",
+ Row: md.Pos.Row,
+ }
+ }
+
+ for _, p := range md.Parameters {
+ sym, ok := symTab.toSymbol(p.ID)
+ if !ok {
+ return nil, &verr.SpecError{
+ Cause: semErrMDInvalidParam,
+ Detail: fmt.Sprintf("'%v' is undefined", p.ID),
+ Row: p.Pos.Row,
+ }
+ }
+ if !sym.isTerminal() {
+ return nil, &verr.SpecError{
+ Cause: semErrMDInvalidParam,
+ Detail: fmt.Sprintf("associativity can take only terminal symbol ('%v' is a non-terminal)", p.ID),
+ Row: p.Pos.Row,
+ }
+ }
+
+ termPrec[sym.num()] = precN
+ termAssoc[sym.num()] = assocTy
+ }
+
+ precN++
+ }
+ }
+
+ prodPrec := map[productionNum]int{}
+ prodAssoc := map[productionNum]assocType{}
+ for _, prod := range prods.getAllProductions() {
+ mostRightTerm := symbolNil
+ for _, sym := range prod.rhs {
+ if !sym.isTerminal() {
+ continue
+ }
+ mostRightTerm = sym
+ }
+ if mostRightTerm.isNil() {
+ continue
+ }
+
+ prec, ok := termPrec[mostRightTerm.num()]
+ if !ok {
+ continue
+ }
+
+ assoc, ok := termAssoc[mostRightTerm.num()]
+ if !ok {
+ continue
+ }
+
+ prodPrec[prod.num] = prec
+ prodAssoc[prod.num] = assoc
+ }
+
+ return &precAndAssoc{
+ termPrec: termPrec,
+ prodPrec: prodPrec,
+ prodAssoc: prodAssoc,
+ }, nil
+}
+
type Class string
const (
@@ -720,6 +865,7 @@ func Compile(gram *Grammar, opts ...CompileOption) (*spec.CompiledGrammar, error
nonTermCount: len(nonTerms),
symTab: gram.symbolTable,
sym2AnonPat: gram.sym2AnonPat,
+ precAndAssoc: gram.precAndAssoc,
}
tab, err = b.build()
if err != nil {
diff --git a/grammar/parsing_table.go b/grammar/parsing_table.go
index 903f95a..aee5963 100644
--- a/grammar/parsing_table.go
+++ b/grammar/parsing_table.go
@@ -136,6 +136,7 @@ type lrTableBuilder struct {
nonTermCount int
symTab *symbolTable
sym2AnonPat map[symbol]string
+ precAndAssoc *precAndAssoc
conflicts []conflict
}
@@ -222,6 +223,12 @@ func (b *lrTableBuilder) writeShiftAction(tab *ParsingTable, state stateNum, sym
nextState: nextState,
prodNum: p,
})
+
+ if b.resolveConflict(sym.num(), p) == ActionTypeShift {
+ tab.writeAction(state.Int(), sym.num().Int(), newShiftActionEntry(nextState))
+ }
+
+ return
}
}
@@ -230,7 +237,7 @@ func (b *lrTableBuilder) writeShiftAction(tab *ParsingTable, state stateNum, sym
// writeReduceAction writes a reduce action to the parsing table. When a shift/reduce conflict occurred,
// we prioritize the shift action, and when a reduce/reduce conflict we prioritize the action that reduces
-// teh production with higher priority. Productions defined earlier in the grammar file have a higher priority.
+// the production with higher priority. Productions defined earlier in the grammar file have a higher priority.
func (b *lrTableBuilder) writeReduceAction(tab *ParsingTable, state stateNum, sym symbol, prod productionNum) {
act := tab.readAction(state.Int(), sym.num().Int())
if !act.isEmpty() {
@@ -261,7 +268,9 @@ func (b *lrTableBuilder) writeReduceAction(tab *ParsingTable, state stateNum, sy
prodNum: prod,
})
- tab.writeAction(state.Int(), sym.num().Int(), newShiftActionEntry(s))
+ if b.resolveConflict(sym.num(), prod) == ActionTypeReduce {
+ tab.writeAction(state.Int(), sym.num().Int(), newReduceActionEntry(prod))
+ }
}
return
@@ -270,6 +279,22 @@ func (b *lrTableBuilder) writeReduceAction(tab *ParsingTable, state stateNum, sy
tab.writeAction(state.Int(), sym.num().Int(), newReduceActionEntry(prod))
}
+func (b *lrTableBuilder) resolveConflict(sym symbolNum, prod productionNum) ActionType {
+ symPrec := b.precAndAssoc.terminalPrecedence(sym)
+ prodPrec := b.precAndAssoc.productionPredence(prod)
+ if symPrec < prodPrec {
+ return ActionTypeShift
+ }
+ if symPrec == prodPrec {
+ assoc := b.precAndAssoc.productionAssociativity(prod)
+ if assoc != assocTypeLeft {
+ return ActionTypeShift
+ }
+ }
+
+ return ActionTypeReduce
+}
+
func (b *lrTableBuilder) writeDescription(w io.Writer, tab *ParsingTable) {
conflicts := map[stateNum][]conflict{}
for _, con := range b.conflicts {
diff --git a/grammar/semantic_error.go b/grammar/semantic_error.go
index 2d722a8..28154e2 100644
--- a/grammar/semantic_error.go
+++ b/grammar/semantic_error.go
@@ -15,6 +15,8 @@ func (e *SemanticError) Error() string {
}
var (
+ semErrMDInvalidName = newSemanticError("invalid meta data name")
+ semErrMDInvalidParam = newSemanticError("invalid parameter")
semErrUnusedProduction = newSemanticError("unused production")
semErrUnusedTerminal = newSemanticError("unused terminal")
semErrTermCannotBeSkipped = newSemanticError("a terminal used in productions cannot be skipped")
diff --git a/spec/clexspec.json b/spec/clexspec.json
index 129278a..6cf753b 100644
--- a/spec/clexspec.json
+++ b/spec/clexspec.json
@@ -1 +1 @@
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,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],"original_row_count":78,"original_col_count":256,"empty_value":0}}}]}
diff --git a/spec/lexer.go b/spec/lexer.go
index 30757c6..da0cf74 100644
--- a/spec/lexer.go
+++ b/spec/lexer.go
@@ -29,6 +29,7 @@ const (
tokenKindTreeNodeClose = tokenKind(")")
tokenKindPosition = tokenKind("$")
tokenKindExpantion = tokenKind("...")
+ tokenKindMetaDataMarker = tokenKind("%")
tokenKindNewline = tokenKind("newline")
tokenKindEOF = tokenKind("eof")
tokenKindInvalid = tokenKind("invalid")
@@ -258,6 +259,8 @@ func (l *lexer) lexAndSkipWSs() (*token, error) {
return newPositionToken(num, newPosition(l.row)), nil
case "expansion":
return newSymbolToken(tokenKindExpantion, newPosition(l.row)), nil
+ case "metadata_marker":
+ return newSymbolToken(tokenKindMetaDataMarker, newPosition(l.row)), nil
default:
return newInvalidToken(tok.Text(), newPosition(l.row)), nil
}
diff --git a/spec/lexer_test.go b/spec/lexer_test.go
index e016def..e5d999e 100644
--- a/spec/lexer_test.go
+++ b/spec/lexer_test.go
@@ -36,7 +36,7 @@ func TestLexer_Run(t *testing.T) {
}{
{
caption: "the lexer can recognize all kinds of tokens",
- src: `id"terminal"'.*+?|()[\':|;#()$1...#`,
+ src: `id"terminal"'.*+?|()[\':|;#()$1...#%`,
tokens: []*token{
idTok("id"),
termPatTok("terminal"),
@@ -49,6 +49,7 @@ func TestLexer_Run(t *testing.T) {
posTok(1),
symTok(tokenKindExpantion),
symTok(tokenKindDirectiveMarker),
+ symTok(tokenKindMetaDataMarker),
newEOFToken(),
},
},
diff --git a/spec/lexspec.json b/spec/lexspec.json
index 12bbee7..c48e2b6 100644
--- a/spec/lexspec.json
+++ b/spec/lexspec.json
@@ -101,6 +101,10 @@
{
"kind": "directive_marker",
"pattern": "#"
+ },
+ {
+ "kind": "metadata_marker",
+ "pattern": "%"
}
]
}
diff --git a/spec/parser.go b/spec/parser.go
index 29248f4..53bf491 100644
--- a/spec/parser.go
+++ b/spec/parser.go
@@ -8,6 +8,7 @@ import (
)
type RootNode struct {
+ MetaData []*DirectiveNode
Productions []*ProductionNode
LexProductions []*ProductionNode
Fragments []*FragmentNode
@@ -135,10 +136,17 @@ func (p *parser) parseRoot() *RootNode {
}
}()
+ var metadata []*DirectiveNode
var prods []*ProductionNode
var lexProds []*ProductionNode
var fragments []*FragmentNode
for {
+ md := p.parseMetaData()
+ if md != nil {
+ metadata = append(metadata, md)
+ continue
+ }
+
fragment := p.parseFragment()
if fragment != nil {
fragments = append(fragments, fragment)
@@ -161,12 +169,61 @@ func (p *parser) parseRoot() *RootNode {
}
return &RootNode{
+ MetaData: metadata,
Productions: prods,
LexProductions: lexProds,
Fragments: fragments,
}
}
+func (p *parser) parseMetaData() *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(tokenKindNewline)
+
+ return
+ }()
+
+ p.consume(tokenKindNewline)
+
+ if !p.consume(tokenKindMetaDataMarker) {
+ return nil
+ }
+ mdPos := p.lastTok.pos
+
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(p.pos.Row, synErrNoProductionName)
+ }
+ name := p.lastTok.text
+
+ var params []*ParameterNode
+ for {
+ if !p.consume(tokenKindID) {
+ break
+ }
+ params = append(params, &ParameterNode{
+ ID: p.lastTok.text,
+ Pos: p.lastTok.pos,
+ })
+ }
+
+ return &DirectiveNode{
+ Name: name,
+ Parameters: params,
+ Pos: mdPos,
+ }
+}
+
func (p *parser) parseFragment() *FragmentNode {
defer func() {
err := recover()
diff --git a/spec/parser_test.go b/spec/parser_test.go
index 29d9051..4821562 100644
--- a/spec/parser_test.go
+++ b/spec/parser_test.go
@@ -8,6 +8,18 @@ import (
)
func TestParse(t *testing.T) {
+ leftAssoc := func(params ...*ParameterNode) *DirectiveNode {
+ return &DirectiveNode{
+ Name: "left",
+ Parameters: params,
+ }
+ }
+ rightAssoc := func(params ...*ParameterNode) *DirectiveNode {
+ return &DirectiveNode{
+ Name: "right",
+ Parameters: params,
+ }
+ }
prod := func(lhs string, alts ...*AlternativeNode) *ProductionNode {
return &ProductionNode{
LHS: lhs,
@@ -537,6 +549,80 @@ fragment number: "[0-9]";
},
},
},
+ {
+ caption: "a grammar can contain left and right associativities",
+ src: `
+%left l1 l2
+%left l3
+%right r1 r2
+%right r3
+
+s
+ : id l1 id l2 id l3 id
+ | id r1 id r2 id r3 id
+ ;
+
+whitespaces: "[\u{0009}\u{0020}]+" #skip;
+l1: 'l1';
+l2: 'l2';
+l3: 'l3';
+r1: 'r1';
+r2: 'r2';
+r3: 'r3';
+id: "[A-Za-z0-9_]+";
+`,
+ ast: &RootNode{
+ MetaData: []*DirectiveNode{
+ withDirPos(
+ leftAssoc(
+ withParamPos(idParam("l1"), newPosition(2)),
+ withParamPos(idParam("l2"), newPosition(2)),
+ ),
+ newPosition(2),
+ ),
+ withDirPos(
+ leftAssoc(
+ withParamPos(idParam("l3"), newPosition(3)),
+ ),
+ newPosition(3),
+ ),
+ withDirPos(
+ rightAssoc(
+ withParamPos(idParam("r1"), newPosition(4)),
+ withParamPos(idParam("r2"), newPosition(4)),
+ ),
+ newPosition(4),
+ ),
+ withDirPos(
+ rightAssoc(
+ withParamPos(idParam("r3"), newPosition(5)),
+ ),
+ newPosition(5),
+ ),
+ },
+ Productions: []*ProductionNode{
+ prod("s",
+ alt(id(`id`), id(`l1`), id(`id`), id(`l2`), id(`id`), id(`l3`), id(`id`)),
+ alt(id(`id`), id(`r1`), id(`id`), id(`r2`), id(`id`), id(`r3`), id(`id`)),
+ ),
+ },
+ LexProductions: []*ProductionNode{
+ prod("whitespaces",
+ withAltDir(
+ alt(pat(`[\u{0009}\u{0020}]+`)),
+ dir("skip"),
+ ),
+ ),
+ prod("l1", alt(pat(`l1`))),
+ prod("l2", alt(pat(`l2`))),
+ prod("l3", alt(pat(`l3`))),
+ prod("r1", alt(pat(`r1`))),
+ prod("r2", alt(pat(`r2`))),
+ prod("r3", alt(pat(`r3`))),
+ prod("id", alt(pat(`[A-Za-z0-9_]+`))),
+ },
+ },
+ },
}
for _, tt := range tests {
t.Run(tt.caption, func(t *testing.T) {
@@ -571,6 +657,12 @@ func testRootNode(t *testing.T, root, expected *RootNode, checkPosition bool) {
if len(root.Productions) != len(expected.Productions) {
t.Fatalf("unexpected length of productions; want: %v, got: %v", len(expected.Productions), len(root.Productions))
}
+ if len(root.MetaData) != len(expected.MetaData) {
+ t.Fatalf("unexpected length of meta data; want: %v, got: %v", len(expected.MetaData), len(root.MetaData))
+ }
+ for i, md := range root.MetaData {
+ testDirective(t, md, expected.MetaData[i], true)
+ }
for i, prod := range root.Productions {
testProductionNode(t, prod, expected.Productions[i], checkPosition)
}