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| author | Ryo Nihei <nihei.dev@gmail.com> | 2021-07-30 23:41:24 +0900 |
|---|---|---|
| committer | Ryo Nihei <nihei.dev@gmail.com> | 2021-07-30 23:56:01 +0900 |
| commit | a80538426fc6df3385e9567064d32b4b45a81669 (patch) | |
| tree | c5049134d8e9011e0b7a0175fc4a64e52a7d5fd0 /driver/parser_test.go | |
| parent | Add a token position and detailed info to a lexical error message (diff) | |
| download | urubu-a80538426fc6df3385e9567064d32b4b45a81669.tar.gz urubu-a80538426fc6df3385e9567064d32b4b45a81669.tar.xz | |
Detect unused-symbol error
When there are productions and terminals that are cannot be reached from the start symbol, the compiler reports an error.
Diffstat (limited to 'driver/parser_test.go')
| -rw-r--r-- | driver/parser_test.go | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/driver/parser_test.go b/driver/parser_test.go index 73d8fac..e32e34c 100644 --- a/driver/parser_test.go +++ b/driver/parser_test.go @@ -148,6 +148,46 @@ bar_text: "bar"; ), ), }, + // Production `b` is unused. + { + specSrc: ` +a + : foo + ; +b + : foo; +foo: "foo"; +`, + src: `foo`, + specErr: true, + }, + // Terminal `bar` is unused. + { + specSrc: ` +s + : foo + ; +foo: "foo"; +bar: "bar"; +`, + src: `foo`, + specErr: true, + }, + // Production `b` and terminal `bar` is unused. + { + specSrc: ` +a + : foo + ; +b + : bar + ; +foo: "foo"; +bar: "bar"; +`, + src: `foo`, + specErr: true, + }, { specSrc: ` mode_tran_seq @@ -258,6 +298,9 @@ bar: "bar"; { specSrc: ` s + : foo + ; +foo : "foo" #ast #(s $1...) ; `, |