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-rw-r--r--driver/parser_test.go88
-rw-r--r--grammar/grammar.go43
-rw-r--r--spec/clexspec.json2
-rw-r--r--spec/lexer.go6
-rw-r--r--spec/lexer_test.go4
-rw-r--r--spec/lexspec.json8
-rw-r--r--spec/parser.go64
-rw-r--r--spec/parser_test.go111
-rw-r--r--spec/syntax_error.go2
9 files changed, 298 insertions, 30 deletions
diff --git a/driver/parser_test.go b/driver/parser_test.go
index bc6a34e..17fee21 100644
--- a/driver/parser_test.go
+++ b/driver/parser_test.go
@@ -9,7 +9,12 @@ import (
)
func TestParser_Parse(t *testing.T) {
- specSrc := `
+ tests := []struct {
+ specSrc string
+ src string
+ }{
+ {
+ specSrc: `
expr
: expr "\+" term
| term
@@ -23,28 +28,65 @@ factor
| id
;
id: "[A-Za-z_][0-9A-Za-z_]*";
-`
- ast, err := spec.Parse(strings.NewReader(specSrc))
- if err != nil {
- t.Fatal(err)
- }
- g, err := grammar.NewGrammar(ast)
- if err != nil {
- t.Fatal(err)
- }
- gram, err := grammar.Compile(g)
- if err != nil {
- t.Fatal(err)
- }
- src := `(a+(b+c))*d+e`
- p, err := NewParser(gram, strings.NewReader(src))
- if err != nil {
- t.Fatal(err)
- }
- err = p.Parse()
- if err != nil {
- t.Fatal(err)
+`,
+ src: `(a+(b+c))*d+e`,
+ },
+ {
+ specSrc: `
+mode_tran_seq
+ : mode_tran_seq mode_tran
+ | mode_tran
+ ;
+mode_tran
+ : push_m1
+ | push_m2
+ | pop_m1
+ | pop_m2
+ ;
+push_m1: "->" # push m1;
+@mode m1
+push_m2: "-->" # push m2;
+@mode m1
+pop_m1 : "<-" # pop;
+@mode m2
+pop_m2: "<--" # pop;
+`,
+ src: `->--><--<-`,
+ },
+ {
+ specSrc: `
+s
+ : foo bar
+ ;
+foo: "foo";
+@mode default
+bar: "bar";
+`,
+ src: `foobar`,
+ },
}
+ for _, tt := range tests {
+ ast, err := spec.Parse(strings.NewReader(tt.specSrc))
+ if err != nil {
+ t.Fatal(err)
+ }
+ g, err := grammar.NewGrammar(ast)
+ if err != nil {
+ t.Fatal(err)
+ }
+ gram, err := grammar.Compile(g)
+ if err != nil {
+ t.Fatal(err)
+ }
+ p, err := NewParser(gram, strings.NewReader(tt.src))
+ if err != nil {
+ t.Fatal(err)
+ }
+ err = p.Parse()
+ if err != nil {
+ t.Fatal(err)
+ }
- printCST(p.GetCST(), 0)
+ printCST(p.GetCST(), 0)
+ }
}
diff --git a/grammar/grammar.go b/grammar/grammar.go
index 2a7953a..4507ddd 100644
--- a/grammar/grammar.go
+++ b/grammar/grammar.go
@@ -29,10 +29,51 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) {
return nil, err
}
+ var modes []mlspec.LexModeName
+ if prod.Modifier != nil {
+ mod := prod.Modifier
+ switch mod.Name {
+ case "mode":
+ if mod.Parameter == "" {
+ return nil, fmt.Errorf("modifier 'mode' needs a parameter")
+ }
+ modes = []mlspec.LexModeName{
+ mlspec.LexModeName(mod.Parameter),
+ }
+ default:
+ return nil, fmt.Errorf("invalid modifier name '%v'", mod.Name)
+ }
+ }
+
+ alt := prod.RHS[0]
+ var push mlspec.LexModeName
+ var pop bool
+ if alt.Action != nil {
+ act := alt.Action
+ switch act.Name {
+ case "push":
+ if act.Parameter == "" {
+ return nil, fmt.Errorf("action 'push' needs a parameter")
+ }
+ push = mlspec.LexModeName(act.Parameter)
+ case "pop":
+ if act.Parameter != "" {
+ return nil, fmt.Errorf("action 'pop' needs no parameter")
+ }
+ pop = true
+ default:
+ return nil, fmt.Errorf("invalid action name '%v'", act.Name)
+ }
+ }
+
entries = append(entries, &mlspec.LexEntry{
+ Modes: modes,
Kind: mlspec.LexKind(prod.LHS),
- Pattern: mlspec.LexPattern(prod.RHS[0].Elements[0].Pattern),
+ Pattern: mlspec.LexPattern(alt.Elements[0].Pattern),
+ Push: push,
+ Pop: pop,
})
+
continue
}
diff --git a/spec/clexspec.json b/spec/clexspec.json
index a96aa88..c7d868e 100644
--- a/spec/clexspec.json
+++ b/spec/clexspec.json
@@ -1 +1 @@
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8,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,44,44,44,44,44,44,44,44,44,44,44,44,44,44,44,44,-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 19efd80..18aae51 100644
--- a/spec/lexer.go
+++ b/spec/lexer.go
@@ -21,6 +21,8 @@ const (
tokenKindColon = tokenKind(":")
tokenKindOr = tokenKind("|")
tokenKindSemicolon = tokenKind(";")
+ tokenKindModifierMarker = tokenKind("@")
+ tokenKindActionLeader = tokenKind("#")
tokenKindEOF = tokenKind("eof")
tokenKindInvalid = tokenKind("invalid")
)
@@ -135,6 +137,10 @@ func (l *lexer) next() (*token, error) {
return newSymbolToken(tokenKindOr), nil
case "semicolon":
return newSymbolToken(tokenKindSemicolon), nil
+ case "modifier_marker":
+ return newSymbolToken(tokenKindModifierMarker), nil
+ case "action_leader":
+ return newSymbolToken(tokenKindActionLeader), nil
default:
return newInvalidToken(tok.Text()), nil
}
diff --git a/spec/lexer_test.go b/spec/lexer_test.go
index 484ad30..af586f2 100644
--- a/spec/lexer_test.go
+++ b/spec/lexer_test.go
@@ -14,13 +14,15 @@ func TestLexer_Run(t *testing.T) {
}{
{
caption: "the lexer can recognize all kinds of tokens",
- src: `id"terminal":|;`,
+ src: `id"terminal":|;@#`,
tokens: []*token{
newIDToken("id"),
newTerminalPatternToken("terminal"),
newSymbolToken(tokenKindColon),
newSymbolToken(tokenKindOr),
newSymbolToken(tokenKindSemicolon),
+ newSymbolToken(tokenKindModifierMarker),
+ newSymbolToken(tokenKindActionLeader),
newEOFToken(),
},
},
diff --git a/spec/lexspec.json b/spec/lexspec.json
index 86d58ae..329a8e2 100644
--- a/spec/lexspec.json
+++ b/spec/lexspec.json
@@ -73,6 +73,14 @@
{
"kind": "semicolon",
"pattern": ";"
+ },
+ {
+ "kind": "modifier_marker",
+ "pattern": "@"
+ },
+ {
+ "kind": "action_leader",
+ "pattern": "#"
}
]
}
diff --git a/spec/parser.go b/spec/parser.go
index 3e86779..1654752 100644
--- a/spec/parser.go
+++ b/spec/parser.go
@@ -9,12 +9,19 @@ type RootNode struct {
}
type ProductionNode struct {
- LHS string
- RHS []*AlternativeNode
+ Modifier *ModifierNode
+ LHS string
+ RHS []*AlternativeNode
+}
+
+type ModifierNode struct {
+ Name string
+ Parameter string
}
type AlternativeNode struct {
Elements []*ElementNode
+ Action *ActionNode
}
type ElementNode struct {
@@ -22,6 +29,11 @@ type ElementNode struct {
Pattern string
}
+type ActionNode struct {
+ Name string
+ Parameter string
+}
+
func raiseSyntaxError(synErr *SyntaxError) {
panic(synErr)
}
@@ -87,13 +99,34 @@ func (p *parser) parseProduction() *ProductionNode {
if p.consume(tokenKindEOF) {
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,
+ }
+ }
+
if !p.consume(tokenKindID) {
raiseSyntaxError(synErrNoProductionName)
}
lhs := p.lastTok.text
+
if !p.consume(tokenKindColon) {
raiseSyntaxError(synErrNoColon)
}
+
alt := p.parseAlternative()
rhs := []*AlternativeNode{alt}
for {
@@ -103,12 +136,15 @@ func (p *parser) parseProduction() *ProductionNode {
alt := p.parseAlternative()
rhs = append(rhs, alt)
}
+
if !p.consume(tokenKindSemicolon) {
raiseSyntaxError(synErrNoSemicolon)
}
+
return &ProductionNode{
- LHS: lhs,
- RHS: rhs,
+ Modifier: mod,
+ LHS: lhs,
+ RHS: rhs,
}
}
@@ -121,8 +157,28 @@ func (p *parser) parseAlternative() *AlternativeNode {
}
elems = append(elems, elem)
}
+
+ var act *ActionNode
+ if p.consume(tokenKindActionLeader) {
+ if !p.consume(tokenKindID) {
+ raiseSyntaxError(synErrNoActionName)
+ }
+ name := p.lastTok.text
+
+ var param string
+ if p.consume(tokenKindID) {
+ param = p.lastTok.text
+ }
+
+ act = &ActionNode{
+ Name: name,
+ Parameter: param,
+ }
+ }
+
return &AlternativeNode{
Elements: elems,
+ Action: act,
}
}
diff --git a/spec/parser_test.go b/spec/parser_test.go
index e061cc9..2060079 100644
--- a/spec/parser_test.go
+++ b/spec/parser_test.go
@@ -12,11 +12,31 @@ func TestParse(t *testing.T) {
RHS: alts,
}
}
+ withModifier := func(prod *ProductionNode, mod *ModifierNode) *ProductionNode {
+ prod.Modifier = mod
+ return prod
+ }
+ modifier := func(name string, param string) *ModifierNode {
+ return &ModifierNode{
+ Name: name,
+ Parameter: param,
+ }
+ }
alternative := func(elems ...*ElementNode) *AlternativeNode {
return &AlternativeNode{
Elements: elems,
}
}
+ withAction := func(alt *AlternativeNode, act *ActionNode) *AlternativeNode {
+ alt.Action = act
+ return alt
+ }
+ action := func(name string, param string) *ActionNode {
+ return &ActionNode{
+ Name: name,
+ Parameter: param,
+ }
+ }
id := func(id string) *ElementNode {
return &ElementNode{
ID: id,
@@ -124,6 +144,75 @@ c: ;
src: `;`,
synErr: synErrNoProductionName,
},
+ {
+ caption: "a grammar can contain production modifiers and semantic actions",
+ src: `
+mode_tran_seq
+ : mode_tran_seq mode_tran
+ | mode_tran
+ ;
+mode_tran
+ : push_m1
+ | push_m2
+ | pop_m1
+ | pop_m2
+ ;
+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")),
+ ),
+ production("mode_tran",
+ alternative(id("push_m1")),
+ alternative(id("push_m2")),
+ alternative(id("pop_m1")),
+ alternative(id("pop_m2")),
+ ),
+ production("push_m1",
+ withAction(
+ alternative(pattern(`->`)),
+ action("push", "m1"),
+ ),
+ ),
+ withModifier(
+ production("push_m2",
+ withAction(
+ alternative(pattern(`-->`)),
+ action("push", "m2"),
+ ),
+ ),
+ modifier("mode", "m1"),
+ ),
+ withModifier(
+ production("pop_m1",
+ withAction(
+ alternative(pattern(`<-`)),
+ action("pop", ""),
+ ),
+ ),
+ modifier("mode", "m1"),
+ ),
+ withModifier(
+ production("pop_m2",
+ withAction(
+ alternative(pattern(`<--`)),
+ action("pop", ""),
+ ),
+ ),
+ modifier("mode", "m2"),
+ ),
+ },
+ },
+ },
}
for _, tt := range tests {
t.Run(tt.caption, func(t *testing.T) {
@@ -160,6 +249,17 @@ 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.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 prod.LHS != expected.LHS {
t.Fatalf("unexpected LHS; want: %v, got: %v", expected.LHS, prod.LHS)
}
@@ -179,6 +279,17 @@ 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.Action != nil {
+ if alt.Action == nil {
+ t.Fatalf("an action is not set; want: %+v, got: nil", expected.Action)
+ }
+ if expected.Action.Name != alt.Action.Name || expected.Action.Parameter != alt.Action.Parameter {
+ t.Fatalf("unexpected action; want: %+v, got: %+v", expected.Action, alt.Action)
+ }
+ }
}
func testElementNode(t *testing.T, elem, expected *ElementNode) {
diff --git a/spec/syntax_error.go b/spec/syntax_error.go
index 6c6b9d7..25701a3 100644
--- a/spec/syntax_error.go
+++ b/spec/syntax_error.go
@@ -28,4 +28,6 @@ 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")
)
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-13 11:36:04 +0000