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authorRyo Nihei <nihei.dev@gmail.com>2021-06-30 23:44:50 +0900
committerRyo Nihei <nihei.dev@gmail.com>2021-06-30 23:54:01 +0900
commitb8b71860d7df5d06dd8a2b9ac62035e8ba8778a7 (patch)
treec0075cd6813085401dbaf44e62ca14ec2b93d30c
parentAdd testing for the driver (diff)
downloadurubu-b8b71860d7df5d06dd8a2b9ac62035e8ba8778a7.tar.gz
urubu-b8b71860d7df5d06dd8a2b9ac62035e8ba8778a7.tar.xz
Simplify syntax of modifiers and semantic actions
Modifiers and semantic actions are represented by directives following the '#' symbol.
Diffstat
-rw-r--r--driver/parser_test.go30
-rw-r--r--grammar/grammar.go46
-rw-r--r--spec/clexspec.json2
-rw-r--r--spec/lexer.go143
-rw-r--r--spec/lexer_test.go29
-rw-r--r--spec/lexspec.json8
-rw-r--r--spec/parser.go82
-rw-r--r--spec/parser_test.go258
-rw-r--r--spec/syntax_error.go5
9 files changed, 329 insertions, 274 deletions
diff --git a/driver/parser_test.go b/driver/parser_test.go
index 71574cf..f11a46a 100644
--- a/driver/parser_test.go
+++ b/driver/parser_test.go
@@ -115,13 +115,13 @@ mode_tran
| pop_m1
| pop_m2
;
-push_m1: "->" # push m1;
-@mode m1
-push_m2: "-->" # push m2;
-@mode m1
-pop_m1 : "<-" # pop;
-@mode m2
-pop_m2: "<--" # pop;
+push_m1: "->" #push m1;
+#mode m1
+push_m2: "-->" #push m2;
+#mode m1
+pop_m1 : "<-" #pop;
+#mode m2
+pop_m2: "<--" #pop;
`,
src: `->--><--<-`,
},
@@ -131,7 +131,7 @@ s
: foo bar
;
foo: "foo";
-@mode default
+#mode default
bar: "bar";
`,
src: `foobar`,
@@ -144,7 +144,7 @@ s
;
foo: "foo";
bar: "bar";
-white_space: "[\u{0009}\u{0020}]+" # skip;
+white_space: "[\u{0009}\u{0020}]+" #skip;
`,
src: `foo bar`,
},
@@ -163,13 +163,13 @@ fragment words: "[A-Za-z\u{0020}]+";
{
specSrc: `
list
- : "\[" elems "]" # ast '(list $2...)
+ : "\[" elems "]" #ast '(list $2...)
;
elems
- : elems "," id # ast '(elems $1... $3)
+ : elems "," id #ast '(elems $1... $3)
| id
;
-whitespace: "\u{0020}+" # skip;
+whitespace: "\u{0020}+" #skip;
id: "[A-Za-z]+";
`,
src: `[Byers, Frohike, Langly]`,
@@ -198,7 +198,7 @@ id: "[A-Za-z]+";
{
specSrc: `
s
- : foo # ast '(start $1)
+ : foo #ast '(start $1)
;
foo
: bar
@@ -211,7 +211,7 @@ bar: "bar";
{
specSrc: `
s
- : "foo" # ast '(s $1...)
+ : "foo" #ast '(s $1...)
;
`,
specErr: true,
@@ -220,7 +220,7 @@ s
{
specSrc: `
s
- : foo # ast '(s $1...)
+ : foo #ast '(s $1...)
;
foo: "foo";
`,
diff --git a/grammar/grammar.go b/grammar/grammar.go
index d0ae2f4..3344b64 100644
--- a/grammar/grammar.go
+++ b/grammar/grammar.go
@@ -38,47 +38,47 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) {
}
var modes []mlspec.LexModeName
- if prod.Modifier != nil {
- mod := prod.Modifier
- switch mod.Name {
+ if prod.Directive != nil {
+ dir := prod.Directive
+ switch dir.Name {
case "mode":
- if mod.Parameter == "" {
- return nil, fmt.Errorf("modifier 'mode' needs a parameter")
+ if dir.Parameter == nil || dir.Parameter.ID == "" {
+ return nil, fmt.Errorf("'mode' directive needs an ID parameter")
}
modes = []mlspec.LexModeName{
- mlspec.LexModeName(mod.Parameter),
+ mlspec.LexModeName(dir.Parameter.ID),
}
default:
- return nil, fmt.Errorf("invalid modifier name '%v'", mod.Name)
+ return nil, fmt.Errorf("invalid directive name '%v'", dir.Name)
}
}
alt := prod.RHS[0]
var push mlspec.LexModeName
var pop bool
- if alt.Action != nil {
- act := alt.Action
- switch act.Name {
+ if alt.Directive != nil {
+ dir := alt.Directive
+ switch dir.Name {
case "skip":
- param := act.Parameter
+ param := dir.Parameter
if param != nil {
- return nil, fmt.Errorf("action 'skip' needs no parameter")
+ return nil, fmt.Errorf("'skip' directive needs no parameter")
}
skip = append(skip, mlspec.LexKind(prod.LHS))
case "push":
- param := act.Parameter
+ param := dir.Parameter
if param == nil || param.ID == "" {
- return nil, fmt.Errorf("action 'push' needs an ID parameter")
+ return nil, fmt.Errorf("'push' directive needs an ID parameter")
}
push = mlspec.LexModeName(param.ID)
case "pop":
- param := act.Parameter
+ param := dir.Parameter
if param != nil {
- return nil, fmt.Errorf("action 'pop' needs no parameter")
+ return nil, fmt.Errorf("'pop' directive needs no parameter")
}
pop = true
default:
- return nil, fmt.Errorf("invalid action name '%v'", act.Name)
+ return nil, fmt.Errorf("invalid directive name '%v'", dir.Name)
}
}
@@ -210,13 +210,13 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) {
}
prods.append(p)
- if alt.Action != nil {
- act := alt.Action
- switch act.Name {
+ if alt.Directive != nil {
+ dir := alt.Directive
+ switch dir.Name {
case "ast":
- param := act.Parameter
+ param := dir.Parameter
if param == nil || param.Tree == nil {
- return nil, fmt.Errorf("action 'push' needs a tree parameter")
+ return nil, fmt.Errorf("'ast' directive needs a tree parameter")
}
lhsText, ok := symTab.toText(p.lhs)
if !ok || param.Tree.Name != lhsText {
@@ -251,7 +251,7 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) {
}
astActs[p.id] = astAct
default:
- return nil, fmt.Errorf("invalid action name '%v'", act.Name)
+ return nil, fmt.Errorf("invalid directive name '%v'", dir.Name)
}
}
}
diff --git a/spec/clexspec.json b/spec/clexspec.json
index fb98a6b..e0495ea 100644
--- a/spec/clexspec.json
+++ b/spec/clexspec.json
@@ -1 +1 @@
-{"initial_mode":1,"modes":["","default","terminal"],"compression_level":2,"specs":[null,{"kinds":["","white_space","newline","line_comment","kw_fragment","identifier","terminal_open","colon","or","semicolon","modifier_marker","action_leader","tree_node_open","tree_node_close","position","expansion"],"push":[0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0],"pop":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"dfa":{"initial_state":1,"accepting_states":[0,0,2,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,5,5,5,5,5,5,0,14,1,4,5,0,2,11,15,8,14,7,9,6,10,12,13],"row_count":49,"col_count":256,"transition":{"unique_entries":{"original_row_count":30,"original_col_count":256,"empty_value":0,"entries":[6,6,6,6,6,6,6,6,6,6,0,6,6,0,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,10,10,10,10,10,10,10,10,10,10,10,10,12,14,14,16,19,19,19,22,34,38,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,34,0,45,39,32,0,0,37,0,48,0,0,0,0,3,5,0,0,0,0,0,0,0,0,0,0,43,44,0,0,0,0,46,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,25,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,41,0,0,0,0,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,26,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,27,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,36,28,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,36,36,36,36,36,36,36,29,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,30,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,36,36,36,36,36,36,36,36,31,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,35,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,36,0,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,42,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,34,0,38,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,34,0,0,0,0,0,0,0,0,0,0,0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,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,-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,-1,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,-1,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,44,44,44,44,44,44,44,44,44,44,44,44,44,44,44,44,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-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":[0,0,736,2548,852,2612,916,2372,980,1044,1108,2839,1172,245,2613,1236,2677,1300,2420,1364,1428,1492,2855,1556,735,2678,1620,2742,1684,2468,1748,1812,1876,2871,1940,490,2743,2004,2807,2068,2516,2132,2196,2260,2887,2324]},"row_nums":[0,1,2,3,2,4,2,5,2,6,2,7,8,2,9,10,2,11,12,2,13,2,14,2,15,2,16,2,17,2,18,19,2,20,21,2,22,23,2,24,2,25,2,26,2,27,2,28,2,29,30,2,31,32,2,33,34,2,35,2,36,2,37,2,38,2,39,2,40,41,2,42,43,2,44,45,2,0],"original_row_count":78,"original_col_count":256,"empty_value":0}}}]}
diff --git a/spec/lexer.go b/spec/lexer.go
index 14c4074..2be3918 100644
--- a/spec/lexer.go
+++ b/spec/lexer.go
@@ -23,12 +23,12 @@ const (
tokenKindColon = tokenKind(":")
tokenKindOr = tokenKind("|")
tokenKindSemicolon = tokenKind(";")
- tokenKindModifierMarker = tokenKind("@")
- tokenKindActionLeader = tokenKind("#")
+ tokenKindDirectiveMarker = tokenKind("#")
tokenKindTreeNodeOpen = tokenKind("'(")
tokenKindTreeNodeClose = tokenKind(")")
tokenKindPosition = tokenKind("$")
tokenKindExpantion = tokenKind("...")
+ tokenKindNewline = tokenKind("newline")
tokenKindEOF = tokenKind("eof")
tokenKindInvalid = tokenKind("invalid")
)
@@ -80,9 +80,9 @@ func newInvalidToken(text string) *token {
}
type lexer struct {
- s *mlspec.CompiledLexSpec
- d *mldriver.Lexer
- dufTok *token
+ s *mlspec.CompiledLexSpec
+ d *mldriver.Lexer
+ buf *token
}
//go:embed clexspec.json
@@ -105,8 +105,36 @@ func newLexer(src io.Reader) (*lexer, error) {
}
func (l *lexer) next() (*token, error) {
+ if l.buf != nil {
+ tok := l.buf
+ l.buf = nil
+ return tok, nil
+ }
+
+ newline := false
+ for {
+ tok, err := l.lexAndSkipWSs()
+ if err != nil {
+ return nil, err
+ }
+ if tok.kind == tokenKindNewline {
+ newline = true
+ continue
+ }
+
+ if newline {
+ l.buf = tok
+ return newSymbolToken(tokenKindNewline), nil
+ }
+ return tok, nil
+ }
+}
+
+func (l *lexer) lexAndSkipWSs() (*token, error) {
+ var tok *mldriver.Token
for {
- tok, err := l.d.Next()
+ var err error
+ tok, err = l.d.Next()
if err != nil {
return nil, err
}
@@ -119,62 +147,65 @@ func (l *lexer) next() (*token, error) {
switch tok.KindName {
case "white_space":
continue
- case "newline":
- continue
case "line_comment":
continue
- case "kw_fragment":
- return newSymbolToken(tokenKindKWFragment), nil
- case "identifier":
- return newIDToken(tok.Text()), nil
- case "terminal_open":
- var b strings.Builder
- for {
- tok, err := l.d.Next()
- if err != nil {
- return nil, err
- }
- if tok.EOF {
- return nil, synErrUnclosedTerminal
- }
- switch tok.KindName {
- case "pattern":
- // Remove '\' character.
- fmt.Fprintf(&b, strings.ReplaceAll(tok.Text(), `\"`, `"`))
- case "escape_symbol":
- return nil, synErrIncompletedEscSeq
- case "terminal_close":
- return newTerminalPatternToken(b.String()), nil
- }
- }
- case "colon":
- return newSymbolToken(tokenKindColon), nil
- case "or":
- return newSymbolToken(tokenKindOr), nil
- case "semicolon":
- return newSymbolToken(tokenKindSemicolon), nil
- case "modifier_marker":
- return newSymbolToken(tokenKindModifierMarker), nil
- case "action_leader":
- return newSymbolToken(tokenKindActionLeader), nil
- case "tree_node_open":
- return newSymbolToken(tokenKindTreeNodeOpen), nil
- case "tree_node_close":
- return newSymbolToken(tokenKindTreeNodeClose), nil
- case "position":
- // Remove '$' character and convert to an integer.
- num, err := strconv.Atoi(tok.Text()[1:])
+ }
+
+ break
+ }
+
+ switch tok.KindName {
+ case "newline":
+ return newSymbolToken(tokenKindNewline), nil
+ case "kw_fragment":
+ return newSymbolToken(tokenKindKWFragment), nil
+ case "identifier":
+ return newIDToken(tok.Text()), nil
+ case "terminal_open":
+ var b strings.Builder
+ for {
+ tok, err := l.d.Next()
if err != nil {
return nil, err
}
- if num == 0 {
- return nil, synErrZeroPos
+ if tok.EOF {
+ return nil, synErrUnclosedTerminal
+ }
+ switch tok.KindName {
+ case "pattern":
+ // Remove '\' character.
+ fmt.Fprintf(&b, strings.ReplaceAll(tok.Text(), `\"`, `"`))
+ case "escape_symbol":
+ return nil, synErrIncompletedEscSeq
+ case "terminal_close":
+ return newTerminalPatternToken(b.String()), nil
}
- return newPositionToken(num), nil
- case "expansion":
- return newSymbolToken(tokenKindExpantion), nil
- default:
- return newInvalidToken(tok.Text()), nil
}
+ case "colon":
+ return newSymbolToken(tokenKindColon), nil
+ case "or":
+ return newSymbolToken(tokenKindOr), nil
+ case "semicolon":
+ return newSymbolToken(tokenKindSemicolon), nil
+ case "directive_marker":
+ return newSymbolToken(tokenKindDirectiveMarker), nil
+ case "tree_node_open":
+ return newSymbolToken(tokenKindTreeNodeOpen), nil
+ case "tree_node_close":
+ return newSymbolToken(tokenKindTreeNodeClose), nil
+ case "position":
+ // Remove '$' character and convert to an integer.
+ num, err := strconv.Atoi(tok.Text()[1:])
+ if err != nil {
+ return nil, err
+ }
+ if num == 0 {
+ return nil, synErrZeroPos
+ }
+ return newPositionToken(num), nil
+ case "expansion":
+ return newSymbolToken(tokenKindExpantion), nil
+ default:
+ return newInvalidToken(tok.Text()), nil
}
}
diff --git a/spec/lexer_test.go b/spec/lexer_test.go
index bd7fbf0..2dc346e 100644
--- a/spec/lexer_test.go
+++ b/spec/lexer_test.go
@@ -14,15 +14,14 @@ 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{
newIDToken("id"),
newTerminalPatternToken("terminal"),
newSymbolToken(tokenKindColon),
newSymbolToken(tokenKindOr),
newSymbolToken(tokenKindSemicolon),
- newSymbolToken(tokenKindModifierMarker),
- newSymbolToken(tokenKindActionLeader),
+ newSymbolToken(tokenKindDirectiveMarker),
newSymbolToken(tokenKindTreeNodeOpen),
newSymbolToken(tokenKindTreeNodeClose),
newPositionToken(1),
@@ -47,6 +46,20 @@ func TestLexer_Run(t *testing.T) {
},
},
{
+ caption: "the lexer can recognize newlines and combine consecutive newlines into one",
+ src: "\u000A | \u000D | \u000D\u000A | \u000A\u000A \u000D\u000D \u000D\u000A\u000D\u000A",
+ tokens: []*token{
+ newSymbolToken(tokenKindNewline),
+ newSymbolToken(tokenKindOr),
+ newSymbolToken(tokenKindNewline),
+ newSymbolToken(tokenKindOr),
+ newSymbolToken(tokenKindNewline),
+ newSymbolToken(tokenKindOr),
+ newSymbolToken(tokenKindNewline),
+ newEOFToken(),
+ },
+ },
+ {
caption: "the lexer ignores line comments",
src: `
// This is the first comment.
@@ -56,8 +69,11 @@ foo
bar // This is the fourth comment.
`,
tokens: []*token{
+ newSymbolToken(tokenKindNewline),
newIDToken("foo"),
+ newSymbolToken(tokenKindNewline),
newIDToken("bar"),
+ newSymbolToken(tokenKindNewline),
newEOFToken(),
},
},
@@ -89,17 +105,12 @@ bar // This is the fourth comment.
{
caption: "the lexer skips white spaces",
// \u0009: HT
- // \u000A: LF
- // \u000D: CR
// \u0020: SP
- src: "a\u0020b\u000Ac\u000Dd\u000D\u000Ae\u0009f",
+ src: "a\u0009b\u0020c",
tokens: []*token{
newIDToken("a"),
newIDToken("b"),
newIDToken("c"),
- newIDToken("d"),
- newIDToken("e"),
- newIDToken("f"),
newEOFToken(),
},
},
diff --git a/spec/lexspec.json b/spec/lexspec.json
index 76fb0e9..6d1dd93 100644
--- a/spec/lexspec.json
+++ b/spec/lexspec.json
@@ -31,7 +31,7 @@
},
{
"kind": "newline",
- "pattern": "\\f{newline}"
+ "pattern": "\\f{newline}+"
},
{
"kind": "line_comment",
@@ -79,11 +79,7 @@
"pattern": ";"
},
{
- "kind": "modifier_marker",
- "pattern": "@"
- },
- {
- "kind": "action_leader",
+ "kind": "directive_marker",
"pattern": "#"
},
{
diff --git a/spec/parser.go b/spec/parser.go
index 6f5e13f..8322a3f 100644
--- a/spec/parser.go
+++ b/spec/parser.go
@@ -10,19 +10,14 @@ type RootNode struct {
}
type ProductionNode struct {
- Modifier *ModifierNode
- LHS string
- RHS []*AlternativeNode
-}
-
-type ModifierNode struct {
- Name string
- Parameter string
+ Directive *DirectiveNode
+ LHS string
+ RHS []*AlternativeNode
}
type AlternativeNode struct {
- Elements []*ElementNode
- Action *ActionNode
+ Elements []*ElementNode
+ Directive *DirectiveNode
}
type ElementNode struct {
@@ -30,7 +25,7 @@ type ElementNode struct {
Pattern string
}
-type ActionNode struct {
+type DirectiveNode struct {
Name string
Parameter *ParameterNode
}
@@ -102,6 +97,8 @@ func (p *parser) parseRoot() *RootNode {
var prods []*ProductionNode
var fragments []*FragmentNode
for {
+ p.consume(tokenKindNewline)
+
fragment := p.parseFragment()
if fragment != nil {
fragments = append(fragments, fragment)
@@ -131,11 +128,15 @@ func (p *parser) parseFragment() *FragmentNode {
return nil
}
+ p.consume(tokenKindNewline)
+
if !p.consume(tokenKindID) {
raiseSyntaxError(synErrNoProductionName)
}
lhs := p.lastTok.text
+ p.consume(tokenKindNewline)
+
if !p.consume(tokenKindColon) {
raiseSyntaxError(synErrNoColon)
}
@@ -145,10 +146,18 @@ func (p *parser) parseFragment() *FragmentNode {
}
rhs := p.lastTok.text
+ p.consume(tokenKindNewline)
+
if !p.consume(tokenKindSemicolon) {
raiseSyntaxError(synErrNoSemicolon)
}
+ if !p.consume(tokenKindNewline) {
+ if !p.consume(tokenKindEOF) {
+ raiseSyntaxError(synErrSemicolonNoNewline)
+ }
+ }
+
return &FragmentNode{
LHS: lhs,
RHS: rhs,
@@ -160,21 +169,10 @@ func (p *parser) parseProduction() *ProductionNode {
return nil
}
- var mod *ModifierNode
- if p.consume(tokenKindModifierMarker) {
- if !p.consume(tokenKindID) {
- raiseSyntaxError(synErrNoModifierName)
- }
- name := p.lastTok.text
-
- var param string
- if p.consume(tokenKindID) {
- param = p.lastTok.text
- }
-
- mod = &ModifierNode{
- Name: name,
- Parameter: param,
+ dir := p.parseDirective()
+ if dir != nil {
+ if !p.consume(tokenKindNewline) {
+ raiseSyntaxError(synErrProdDirNoNewline)
}
}
@@ -183,6 +181,8 @@ func (p *parser) parseProduction() *ProductionNode {
}
lhs := p.lastTok.text
+ p.consume(tokenKindNewline)
+
if !p.consume(tokenKindColon) {
raiseSyntaxError(synErrNoColon)
}
@@ -190,6 +190,8 @@ func (p *parser) parseProduction() *ProductionNode {
alt := p.parseAlternative()
rhs := []*AlternativeNode{alt}
for {
+ p.consume(tokenKindNewline)
+
if !p.consume(tokenKindOr) {
break
}
@@ -197,14 +199,22 @@ func (p *parser) parseProduction() *ProductionNode {
rhs = append(rhs, alt)
}
+ p.consume(tokenKindNewline)
+
if !p.consume(tokenKindSemicolon) {
raiseSyntaxError(synErrNoSemicolon)
}
+ if !p.consume(tokenKindNewline) {
+ if !p.consume(tokenKindEOF) {
+ raiseSyntaxError(synErrSemicolonNoNewline)
+ }
+ }
+
return &ProductionNode{
- Modifier: mod,
- LHS: lhs,
- RHS: rhs,
+ Directive: dir,
+ LHS: lhs,
+ RHS: rhs,
}
}
@@ -218,11 +228,11 @@ func (p *parser) parseAlternative() *AlternativeNode {
elems = append(elems, elem)
}
- act := p.parseAction()
+ dir := p.parseDirective()
return &AlternativeNode{
- Elements: elems,
- Action: act,
+ Elements: elems,
+ Directive: dir,
}
}
@@ -240,13 +250,13 @@ func (p *parser) parseElement() *ElementNode {
return nil
}
-func (p *parser) parseAction() *ActionNode {
- if !p.consume(tokenKindActionLeader) {
+func (p *parser) parseDirective() *DirectiveNode {
+ if !p.consume(tokenKindDirectiveMarker) {
return nil
}
if !p.consume(tokenKindID) {
- raiseSyntaxError(synErrNoActionName)
+ raiseSyntaxError(synErrNoDirectiveName)
}
name := p.lastTok.text
@@ -290,7 +300,7 @@ func (p *parser) parseAction() *ActionNode {
}
}
- return &ActionNode{
+ return &DirectiveNode{
Name: name,
Parameter: param,
}
diff --git a/spec/parser_test.go b/spec/parser_test.go
index 7026d32..788c4b3 100644
--- a/spec/parser_test.go
+++ b/spec/parser_test.go
@@ -6,43 +6,37 @@ import (
)
func TestParse(t *testing.T) {
- production := func(lhs string, alts ...*AlternativeNode) *ProductionNode {
+ prod := func(lhs string, alts ...*AlternativeNode) *ProductionNode {
return &ProductionNode{
LHS: lhs,
RHS: alts,
}
}
- withModifier := func(prod *ProductionNode, mod *ModifierNode) *ProductionNode {
- prod.Modifier = mod
+ withProdDir := func(prod *ProductionNode, dir *DirectiveNode) *ProductionNode {
+ prod.Directive = dir
return prod
}
- modifier := func(name string, param string) *ModifierNode {
- return &ModifierNode{
- Name: name,
- Parameter: param,
- }
- }
- alternative := func(elems ...*ElementNode) *AlternativeNode {
+ alt := func(elems ...*ElementNode) *AlternativeNode {
return &AlternativeNode{
Elements: elems,
}
}
- withAction := func(alt *AlternativeNode, act *ActionNode) *AlternativeNode {
- alt.Action = act
+ withAltDir := func(alt *AlternativeNode, dir *DirectiveNode) *AlternativeNode {
+ alt.Directive = dir
return alt
}
- action := func(name string, param *ParameterNode) *ActionNode {
- return &ActionNode{
+ dir := func(name string, param *ParameterNode) *DirectiveNode {
+ return &DirectiveNode{
Name: name,
Parameter: param,
}
}
- idParameter := func(id string) *ParameterNode {
+ idParam := func(id string) *ParameterNode {
return &ParameterNode{
ID: id,
}
}
- treeParameter := func(name string, children ...*TreeChildNode) *ParameterNode {
+ treeParam := func(name string, children ...*TreeChildNode) *ParameterNode {
return &ParameterNode{
Tree: &TreeStructNode{
Name: name,
@@ -50,12 +44,12 @@ func TestParse(t *testing.T) {
},
}
}
- positionChild := func(pos int) *TreeChildNode {
+ pos := func(pos int) *TreeChildNode {
return &TreeChildNode{
Position: pos,
}
}
- expandChildren := func(c *TreeChildNode) *TreeChildNode {
+ exp := func(c *TreeChildNode) *TreeChildNode {
c.Expansion = true
return c
}
@@ -64,12 +58,12 @@ func TestParse(t *testing.T) {
ID: id,
}
}
- pattern := func(p string) *ElementNode {
+ pat := func(p string) *ElementNode {
return &ElementNode{
Pattern: p,
}
}
- fragment := func(lhs string, rhs string) *FragmentNode {
+ frag := func(lhs string, rhs string) *FragmentNode {
return &FragmentNode{
LHS: lhs,
RHS: rhs,
@@ -87,7 +81,7 @@ func TestParse(t *testing.T) {
src: `a: "a";`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("a", alternative(pattern("a"))),
+ prod("a", alt(pat("a"))),
},
},
},
@@ -101,20 +95,20 @@ id: "[A-Za-z_][0-9A-Za-z_]*";
`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("e",
- alternative(id("e"), pattern(`\+|-`), id("t")),
- alternative(id("t")),
+ prod("e",
+ alt(id("e"), pat(`\+|-`), id("t")),
+ alt(id("t")),
),
- production("t",
- alternative(id("t"), pattern(`\*|/`), id("f")),
- alternative(id("f")),
+ prod("t",
+ alt(id("t"), pat(`\*|/`), id("f")),
+ alt(id("f")),
),
- production("f",
- alternative(pattern(`\(`), id("e"), pattern(`)`)),
- alternative(id("id")),
+ prod("f",
+ alt(pat(`\(`), id("e"), pat(`)`)),
+ alt(id("id")),
),
- production("id",
- alternative(pattern(`[A-Za-z_][0-9A-Za-z_]*`)),
+ prod("id",
+ alt(pat(`[A-Za-z_][0-9A-Za-z_]*`)),
),
},
},
@@ -128,16 +122,16 @@ c: ;
`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("a",
- alternative(pattern(`foo`)),
- alternative(),
+ prod("a",
+ alt(pat(`foo`)),
+ alt(),
),
- production("b",
- alternative(),
- alternative(pattern(`bar`)),
+ prod("b",
+ alt(),
+ alt(pat(`bar`)),
),
- production("c",
- alternative(),
+ prod("c",
+ alt(),
),
},
},
@@ -183,20 +177,20 @@ fragment words: "[A-Za-z\u{0020}]+";
`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("s",
- alternative(id("tagline")),
+ prod("s",
+ alt(id("tagline")),
),
- production("tagline",
- alternative(pattern(`\f{words} IS OUT THERE.`)),
+ prod("tagline",
+ alt(pat(`\f{words} IS OUT THERE.`)),
),
},
Fragments: []*FragmentNode{
- fragment("words", `[A-Za-z\u{0020}]+`),
+ frag("words", `[A-Za-z\u{0020}]+`),
},
},
},
{
- caption: "a grammar can contain production modifiers and semantic actions",
+ caption: "a grammar can contain production directives and alternative directives",
src: `
mode_tran_seq
: mode_tran_seq mode_tran
@@ -208,98 +202,112 @@ mode_tran
| pop_m1
| pop_m2
;
-push_m1: "->" # push m1;
-@mode m1
-push_m2: "-->" # push m2;
-@mode m1
-pop_m1 : "<-" # pop;
-@mode m2
-pop_m2: "<--" # pop;
+push_m1: "->" #push m1;
+#mode m1
+push_m2: "-->" #push m2;
+#mode m1
+pop_m1 : "<-" #pop;
+#mode m2
+pop_m2: "<--" #pop;
`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("mode_tran_seq",
- alternative(id("mode_tran_seq"), id("mode_tran")),
- alternative(id("mode_tran")),
+ prod("mode_tran_seq",
+ alt(id("mode_tran_seq"), id("mode_tran")),
+ alt(id("mode_tran")),
),
- production("mode_tran",
- alternative(id("push_m1")),
- alternative(id("push_m2")),
- alternative(id("pop_m1")),
- alternative(id("pop_m2")),
+ prod("mode_tran",
+ alt(id("push_m1")),
+ alt(id("push_m2")),
+ alt(id("pop_m1")),
+ alt(id("pop_m2")),
),
- production("push_m1",
- withAction(
- alternative(pattern(`->`)),
- action("push", idParameter("m1")),
+ prod("push_m1",
+ withAltDir(
+ alt(pat(`->`)),
+ dir("push", idParam("m1")),
),
),
- withModifier(
- production("push_m2",
- withAction(
- alternative(pattern(`-->`)),
- action("push", idParameter("m2")),
+ withProdDir(
+ prod("push_m2",
+ withAltDir(
+ alt(pat(`-->`)),
+ dir("push", idParam("m2")),
),
),
- modifier("mode", "m1"),
+ dir("mode", idParam("m1")),
),
- withModifier(
- production("pop_m1",
- withAction(
- alternative(pattern(`<-`)),
- action("pop", nil),
+ withProdDir(
+ prod("pop_m1",
+ withAltDir(
+ alt(pat(`<-`)),
+ dir("pop", nil),
),
),
- modifier("mode", "m1"),
+ dir("mode", idParam("m1")),
),
- withModifier(
- production("pop_m2",
- withAction(
- alternative(pattern(`<--`)),
- action("pop", nil),
+ withProdDir(
+ prod("pop_m2",
+ withAltDir(
+ alt(pat(`<--`)),
+ dir("pop", nil),
),
),
- modifier("mode", "m2"),
+ dir("mode", idParam("m2")),
),
},
},
},
{
- caption: "a grammar can contain 'ast' actions",
+ caption: "a production directive must be followed by a newline",
+ src: `
+#mode foo;
+`,
+ synErr: synErrProdDirNoNewline,
+ },
+ {
+ caption: "a production must be followed by a newline",
+ src: `
+s: foo; foo: "foo";
+`,
+ synErr: synErrSemicolonNoNewline,
+ },
+ {
+ caption: "a grammar can contain 'ast' directives",
src: `
s
- : foo bar_list # ast '(s $1 $2)
+ : foo bar_list #ast '(s $1 $2)
;
bar_list
- : bar_list bar # ast '(bar_list $1... $2)
- | bar # ast '(bar_list $1)
+ : bar_list bar #ast '(bar_list $1... $2)
+ | bar #ast '(bar_list $1)
;
foo: "foo";
bar: "bar";
`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("s",
- withAction(
- alternative(id("foo"), id("bar_list")),
- action("ast", treeParameter("s", positionChild(1), positionChild(2))),
+ prod("s",
+ withAltDir(
+ alt(id("foo"), id("bar_list")),
+ dir("ast", treeParam("s", pos(1), pos(2))),
),
),
- production("bar_list",
- withAction(
- alternative(id("bar_list"), id("bar")),
- action("ast", treeParameter("bar_list", expandChildren(positionChild(1)), positionChild(2))),
+ prod("bar_list",
+ withAltDir(
+ alt(id("bar_list"), id("bar")),
+ dir("ast", treeParam("bar_list", exp(pos(1)), pos(2))),
),
- withAction(
- alternative(id("bar")),
- action("ast", treeParameter("bar_list", positionChild(1))),
+ withAltDir(
+ alt(id("bar")),
+ dir("ast", treeParam("bar_list", pos(1))),
),
),
- production("foo",
- alternative(pattern("foo")),
+ prod("foo",
+ alt(pat("foo")),
),
- production("bar",
- alternative(pattern("bar")),
+ prod("bar",
+ alt(pat("bar")),
),
},
},
@@ -308,7 +316,7 @@ bar: "bar";
caption: "the first element of a tree structure must be an ID",
src: `
s
- : foo # ast '($1)
+ : foo #ast '($1)
;
foo: "foo";
`,
@@ -318,7 +326,7 @@ foo: "foo";
caption: "a tree structure must be closed by ')'",
src: `
s
- : foo # ast '(s $1
+ : foo #ast '(s $1
;
foo: "foo";
`,
@@ -360,16 +368,14 @@ func testRootNode(t *testing.T, root, expected *RootNode) {
func testProductionNode(t *testing.T, prod, expected *ProductionNode) {
t.Helper()
- if expected.Modifier == nil && prod.Modifier != nil {
- t.Fatalf("unexpected modifier; want: nil, got: %+v", prod.Modifier)
+ if expected.Directive == nil && prod.Directive != nil {
+ t.Fatalf("unexpected directive; want: nil, got: %+v", prod.Directive)
}
- if expected.Modifier != nil {
- if prod.Modifier == nil {
- t.Fatalf("a modifier is not set; want: %+v, got: nil", expected.Modifier)
- }
- if expected.Modifier.Name != prod.Modifier.Name || expected.Modifier.Parameter != prod.Modifier.Parameter {
- t.Fatalf("unexpected modifier; want: %+v, got: %+v", expected.Modifier, prod.Modifier)
+ if expected.Directive != nil {
+ if prod.Directive == nil {
+ t.Fatalf("a directive is not set; want: %+v, got: nil", expected.Directive)
}
+ testDirective(t, prod.Directive, expected.Directive)
}
if prod.LHS != expected.LHS {
t.Fatalf("unexpected LHS; want: %v, got: %v", expected.LHS, prod.LHS)
@@ -390,14 +396,14 @@ func testAlternativeNode(t *testing.T, alt, expected *AlternativeNode) {
for i, elem := range alt.Elements {
testElementNode(t, elem, expected.Elements[i])
}
- if expected.Action == nil && alt.Action != nil {
- t.Fatalf("unexpected action; want: nil, got: %+v", alt.Action)
+ if expected.Directive == nil && alt.Directive != nil {
+ t.Fatalf("unexpected directive; want: nil, got: %+v", alt.Directive)
}
- if expected.Action != nil {
- if alt.Action == nil {
- t.Fatalf("an action is not set; want: %+v, got: nil", expected.Action)
+ if expected.Directive != nil {
+ if alt.Directive == nil {
+ t.Fatalf("a directive is not set; want: %+v, got: nil", expected.Directive)
}
- testAction(t, alt.Action, expected.Action)
+ testDirective(t, alt.Directive, expected.Directive)
}
}
@@ -408,19 +414,19 @@ func testElementNode(t *testing.T, elem, expected *ElementNode) {
}
}
-func testAction(t *testing.T, act, expected *ActionNode) {
+func testDirective(t *testing.T, dir, expected *DirectiveNode) {
t.Helper()
- if expected.Name != act.Name {
- t.Fatalf("unexpected action name; want: %+v, got: %+v", expected.Name, act.Name)
+ if expected.Name != dir.Name {
+ t.Fatalf("unexpected directive name; want: %+v, got: %+v", expected.Name, dir.Name)
}
- if expected.Parameter == nil && act.Parameter != nil {
- t.Fatalf("unexpected action parameter; want: nil, got: %+v", act.Parameter)
+ if expected.Parameter == nil && dir.Parameter != nil {
+ t.Fatalf("unexpected directive parameter; want: nil, got: %+v", dir.Parameter)
}
if expected.Parameter != nil {
- if act.Parameter == nil {
- t.Fatalf("unexpected action parameter; want: %+v, got: nil", expected.Parameter)
+ if dir.Parameter == nil {
+ t.Fatalf("unexpected directive parameter; want: %+v, got: nil", expected.Parameter)
}
- testParameter(t, act.Parameter, expected.Parameter)
+ testParameter(t, dir.Parameter, expected.Parameter)
}
}
diff --git a/spec/syntax_error.go b/spec/syntax_error.go
index d0e0dc5..cefde12 100644
--- a/spec/syntax_error.go
+++ b/spec/syntax_error.go
@@ -29,8 +29,9 @@ var (
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")
- synErrNoModifierName = newSyntaxError("a modifier needs a name")
- synErrNoActionName = newSyntaxError("an action needs a name")
+ synErrNoDirectiveName = newSyntaxError("a directive needs a name")
+ synErrProdDirNoNewline = newSyntaxError("a production directive must be followed by a newline")
+ synErrSemicolonNoNewline = newSyntaxError("a semicolon must be followed by a newline")
synErrFragmentNoPattern = newSyntaxError("a fragment needs one pattern element")
synErrTreeInvalidFirstElem = newSyntaxError("the first element of a tree structure must be an ID")
synErrTreeUnclosed = newSyntaxError("unclosed tree structure")
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-13 07:46:05 +0000