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muscles: fix handling of the "@'" escape

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When we use `b4_` or `m4_` somewhere in the input, it is escaped as
`b4@'_`/`m4@'_` so that the warning about unexpanded b4_foo/m4_foo
macros does not fire.

But in the case of muscles, the `@'` escape was not recognized, and an
assertion was triggered.

Reported by Han Zheng.
<https://github.com/akimd/bison/issues/91>

* src/muscle-tab.c (COMMON_DECODE): Handle `@'`.
* tests/skeletons.at (Suspicious sequences): Check that case.
This commit is contained in:
Akim Demaille
2022-09-04 08:34:11 +02:00
parent eb83487606
commit 6376364120
2 changed files with 20 additions and 4 deletions
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9
src/muscle-tab.c
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@@ -294,10 +294,11 @@ muscle_location_grow (char const *key, location loc)
case '@': \
switch (*++(Value)) \
{ \
case '@': obstack_sgrow (&muscle_obstack, "@" ); break; \
case '{': obstack_sgrow (&muscle_obstack, "[" ); break; \
case '}': obstack_sgrow (&muscle_obstack, "]" ); break; \
default: aver (false); break; \
case '\'': /* Ignore "@'" */ break; \
case '@': obstack_sgrow (&muscle_obstack, "@" ); break; \
case '{': obstack_sgrow (&muscle_obstack, "[" ); break; \
case '}': obstack_sgrow (&muscle_obstack, "]" ); break; \
default: aver (false); break; \
} \
break; \
default: \