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Diffstat (limited to 'spec/grammar/parser_test.go')
-rw-r--r--spec/grammar/parser_test.go85
1 files changed, 75 insertions, 10 deletions
diff --git a/spec/grammar/parser_test.go b/spec/grammar/parser_test.go
index dcacd7d..4fd7e9f 100644
--- a/spec/grammar/parser_test.go
+++ b/spec/grammar/parser_test.go
@@ -272,23 +272,25 @@ func TestParse(t *testing.T) {
{
caption: "multiple productions are a valid grammar",
src: `
-e: e "\+|-" t | t;
-t: t "\*|/" f | f;
-f: "\(" e ")" | id;
+e: e '+' t | e '-' t | t;
+t: t '*' f | t '/' f | f;
+f: '(' e ')' | id;
id: "[A-Za-z_][0-9A-Za-z_]*";
`,
ast: &RootNode{
Productions: []*ProductionNode{
prod("e",
- alt(id("e"), pat(`\+|-`), id("t")),
+ alt(id("e"), pat(`+`), id("t")),
+ alt(id("e"), pat(`-`), id("t")),
alt(id("t")),
),
prod("t",
- alt(id("t"), pat(`\*|/`), id("f")),
+ alt(id("t"), pat(`*`), id("f")),
+ alt(id("t"), pat(`/`), id("f")),
alt(id("f")),
),
prod("f",
- alt(pat(`\(`), id("e"), pat(`)`)),
+ alt(pat(`(`), id("e"), pat(`)`)),
alt(id("id")),
),
},
@@ -302,8 +304,8 @@ id: "[A-Za-z_][0-9A-Za-z_]*";
{
caption: "productions can contain the empty alternative",
src: `
-a: "foo" | ;
-b: | "bar";
+a: 'foo' | ;
+b: | 'bar';
c: ;
`,
ast: &RootNode{
@@ -330,6 +332,69 @@ a: $x;
synErr: synErrNoSemicolon,
},
{
+ caption: "an alternative can contain a string literal without a terminal symbol",
+ src: `
+s
+ : 'foo' bar
+ ;
+
+bar
+ : 'bar';
+`,
+ ast: &RootNode{
+ Productions: []*ProductionNode{
+ prod("s",
+ alt(pat(`foo`), id("bar")),
+ ),
+ },
+ LexProductions: []*ProductionNode{
+ prod("bar",
+ alt(pat(`bar`)),
+ ),
+ },
+ },
+ },
+ {
+ caption: "an alternative cannot contain a pattern directly",
+ src: `
+s
+ : "foo" bar
+ ;
+
+bar
+ : "bar";
+`,
+ synErr: synErrPatternInAlt,
+ },
+ {
+ caption: "a terminal symbol can be defined using a string literal",
+ src: `
+foo
+ : 'foo';
+`,
+ ast: &RootNode{
+ LexProductions: []*ProductionNode{
+ prod("foo",
+ alt(pat(`foo`)),
+ ),
+ },
+ },
+ },
+ {
+ caption: "a terminal symbol can be defined using a pattern",
+ src: `
+foo
+ : "foo";
+`,
+ ast: &RootNode{
+ LexProductions: []*ProductionNode{
+ prod("foo",
+ alt(pat(`foo`)),
+ ),
+ },
+ },
+ },
+ {
caption: "`fragment` is a reserved word",
src: `fragment: 'fragment';`,
synErr: synErrNoProductionName,
@@ -656,7 +721,7 @@ a
caption: "an AST has node positions",
src: `
exp
- : exp "\+" id #ast exp id
+ : exp '+' id #ast exp id
| id
;
@@ -678,7 +743,7 @@ fragment number
withAltDir(
alt(
withElemPos(id("exp"), newPos(3)),
- withElemPos(pat(`\+`), newPos(3)),
+ withElemPos(pat(`+`), newPos(3)),
withElemPos(id("id"), newPos(3)),
),
withDirPos(