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diagnostics: factor and enhance messages about duplicate rule directives

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When reporting a duplicate directive on a rule, point to its first
occurrence:

one.y:11.10-15: error: only one %empty allowed per rule
   %empty {} %empty
             ^^^^^^
one.y:11.3-8: previous declaration
   %empty {} %empty
   ^^^^^^

And consistently discard the second one.

* src/complain.h, src/complain.c (duplicate_directive): New.
* src/reader.c: Use it where appropriate.
* src/symlist.h, src/symlist.c (symbol_list): Add a dprec_location member.
* tests/actions.at: Adjust expected output.
This commit is contained in:
Akim Demaille
2013-02-17 12:47:35 +01:00
parent 4c9b8f1318
commit 0fe5a72a26
6 changed files with 44 additions and 12 deletions
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11
tests/actions.at
View File

@@ -114,14 +114,17 @@ AT_SETUP([Invalid uses of %empty])
AT_DATA_GRAMMAR([[one.y]],
[[%%
exp:
%empty %empty {}
%empty {} %empty
;
]])
AT_BISON_CHECK([-fcaret one.y], [1], [],
[[one.y:11.10-15: error: only one %empty allowed per rule
%empty %empty {}
^^^^^^
[[one.y:11.13-18: error: only one %empty allowed per rule
%empty {} %empty
^^^^^^
one.y:11.3-8: previous declaration
%empty {} %empty
^^^^^^
]])
AT_DATA_GRAMMAR([[two.y]],