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-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.go38
-rw-r--r--spec/parser_test.go58
-rw-r--r--spec/syntax_error.go1
7 files changed, 85 insertions, 24 deletions
diff --git a/spec/clexspec.json b/spec/clexspec.json
index ba0edad..d493962 100644
--- a/spec/clexspec.json
+++ b/spec/clexspec.json
@@ -1 +1 @@
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0,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,37,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,41,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,43,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,-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 54eb13a..943cbf9 100644
--- a/spec/lexer.go
+++ b/spec/lexer.go
@@ -19,6 +19,7 @@ const (
tokenKindID = tokenKind("id")
tokenKindTerminalPattern = tokenKind("terminal pattern")
tokenKindColon = tokenKind(":")
+ tokenKindOr = tokenKind("|")
tokenKindSemicolon = tokenKind(";")
tokenKindEOF = tokenKind("eof")
tokenKindInvalid = tokenKind("invalid")
@@ -128,6 +129,8 @@ func (l *lexer) next() (*token, error) {
}
case "colon":
return newSymbolToken(tokenKindColon), nil
+ case "or":
+ return newSymbolToken(tokenKindOr), nil
case "semicolon":
return newSymbolToken(tokenKindSemicolon), nil
default:
diff --git a/spec/lexer_test.go b/spec/lexer_test.go
index e7ba3cc..1edf15c 100644
--- a/spec/lexer_test.go
+++ b/spec/lexer_test.go
@@ -14,11 +14,12 @@ 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),
newEOFToken(),
},
diff --git a/spec/lexspec.json b/spec/lexspec.json
index 11c2806..7889f3e 100644
--- a/spec/lexspec.json
+++ b/spec/lexspec.json
@@ -63,6 +63,10 @@
"pattern": ":"
},
{
+ "kind": "or",
+ "pattern": "\\|"
+ },
+ {
"kind": "semicolon",
"pattern": ";"
}
diff --git a/spec/parser.go b/spec/parser.go
index a204cb7..3e86779 100644
--- a/spec/parser.go
+++ b/spec/parser.go
@@ -18,6 +18,7 @@ type AlternativeNode struct {
}
type ElementNode struct {
+ ID string
Pattern string
}
@@ -94,32 +95,49 @@ func (p *parser) parseProduction() *ProductionNode {
raiseSyntaxError(synErrNoColon)
}
alt := p.parseAlternative()
+ rhs := []*AlternativeNode{alt}
+ for {
+ if !p.consume(tokenKindOr) {
+ break
+ }
+ alt := p.parseAlternative()
+ rhs = append(rhs, alt)
+ }
if !p.consume(tokenKindSemicolon) {
raiseSyntaxError(synErrNoSemicolon)
}
return &ProductionNode{
LHS: lhs,
- RHS: []*AlternativeNode{alt},
+ RHS: rhs,
}
}
func (p *parser) parseAlternative() *AlternativeNode {
- elem := p.parseElement()
- if elem == nil {
- raiseSyntaxError(synErrNoElement)
+ elems := []*ElementNode{}
+ for {
+ elem := p.parseElement()
+ if elem == nil {
+ break
+ }
+ elems = append(elems, elem)
}
return &AlternativeNode{
- Elements: []*ElementNode{elem},
+ Elements: elems,
}
}
func (p *parser) parseElement() *ElementNode {
- if !p.consume(tokenKindTerminalPattern) {
- return nil
- }
- return &ElementNode{
- Pattern: p.lastTok.text,
+ switch {
+ case p.consume(tokenKindID):
+ return &ElementNode{
+ ID: p.lastTok.text,
+ }
+ case p.consume(tokenKindTerminalPattern):
+ return &ElementNode{
+ Pattern: p.lastTok.text,
+ }
}
+ return nil
}
func (p *parser) consume(expected tokenKind) bool {
diff --git a/spec/parser_test.go b/spec/parser_test.go
index 483c0b4..e061cc9 100644
--- a/spec/parser_test.go
+++ b/spec/parser_test.go
@@ -17,6 +17,11 @@ func TestParse(t *testing.T) {
Elements: elems,
}
}
+ id := func(id string) *ElementNode {
+ return &ElementNode{
+ ID: id,
+ }
+ }
pattern := func(p string) *ElementNode {
return &ElementNode{
Pattern: p,
@@ -41,15 +46,51 @@ func TestParse(t *testing.T) {
{
caption: "multiple productions are a valid grammar",
src: `
-a: "a";
-b: "b";
-c: "c";
+e: e "\+|-" t | t;
+t: t "\*|/" f | f;
+f: "\(" e ")" | id;
+id: "[A-Za-z_][0-9A-Za-z_]*";
`,
ast: &RootNode{
Productions: []*ProductionNode{
- production("a", alternative(pattern("a"))),
- production("b", alternative(pattern("b"))),
- production("c", alternative(pattern("c"))),
+ production("e",
+ alternative(id("e"), pattern(`\+|-`), id("t")),
+ alternative(id("t")),
+ ),
+ production("t",
+ alternative(id("t"), pattern(`\*|/`), id("f")),
+ alternative(id("f")),
+ ),
+ production("f",
+ alternative(pattern(`\(`), id("e"), pattern(`)`)),
+ alternative(id("id")),
+ ),
+ production("id",
+ alternative(pattern(`[A-Za-z_][0-9A-Za-z_]*`)),
+ ),
+ },
+ },
+ },
+ {
+ caption: "productions can contain the empty alternative",
+ src: `
+a: "foo" | ;
+b: | "bar";
+c: ;
+`,
+ ast: &RootNode{
+ Productions: []*ProductionNode{
+ production("a",
+ alternative(pattern(`foo`)),
+ alternative(),
+ ),
+ production("b",
+ alternative(),
+ alternative(pattern(`bar`)),
+ ),
+ production("c",
+ alternative(),
+ ),
},
},
},
@@ -74,11 +115,6 @@ c: "c";
synErr: synErrNoColon,
},
{
- caption: "an alternative must have at least one element",
- src: `a:;`,
- synErr: synErrNoElement,
- },
- {
caption: "';' must follow a production",
src: `a: "a"`,
synErr: synErrNoSemicolon,
diff --git a/spec/syntax_error.go b/spec/syntax_error.go
index 815b38f..6c6b9d7 100644
--- a/spec/syntax_error.go
+++ b/spec/syntax_error.go
@@ -28,5 +28,4 @@ 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")
- synErrNoElement = newSyntaxError("an alternative must have at least one element")
)
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-21 17:49:17 +0000