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parser: use %empty

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Avoid that Bison's own use of "bison -Wall" trigger warnings.

* src/parse-gram.y: Use %empty for every empty rule.
This commit is contained in:
Akim Demaille
2013-02-09 13:47:14 +01:00
parent ae2b48f5c0
commit fd003416d5
1 changed files with 12 additions and 13 deletions
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25
src/parse-gram.y
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@@ -274,7 +274,7 @@ input:
`------------------------------------*/
prologue_declarations:
/* Nothing */
%empty
| prologue_declarations prologue_declaration
;
@@ -430,8 +430,8 @@ code_props_type:
%token PERCENT_UNION "%union";
union_name:
/* Nothing. */ {}
| ID { muscle_code_grow ("union_name", $1, @1); }
%empty {}
| ID { muscle_code_grow ("union_name", $1, @1); }
;
grammar_declaration:
@@ -490,8 +490,8 @@ precedence_declarator:
;
tag.opt:
/* Nothing. */ { current_type = NULL; }
| TAG { current_type = $1; tag_seen = true; }
%empty { current_type = NULL; }
| TAG { current_type = $1; tag_seen = true; }
;
/* Just like symbols.1 but accept INT for the sake of POSIX. */
@@ -607,7 +607,7 @@ rhses.1:
%token PERCENT_EMPTY "%empty";
rhs:
/* Nothing. */
%empty
{ grammar_current_rule_begin (current_lhs_symbol, current_lhs_location,
current_lhs_named_ref); }
| rhs symbol named_ref.opt
@@ -627,9 +627,8 @@ rhs:
;
named_ref.opt:
/* Nothing. */ { $$ = 0; }
|
BRACKETED_ID { $$ = named_ref_new ($1, @1); }
%empty { $$ = 0; }
| BRACKETED_ID { $$ = named_ref_new($1, @1); }
;
/*---------------------------.
@@ -645,9 +644,9 @@ variable:
/* Some content or empty by default. */
content.opt:
/* Nothing. */ { $$ = ""; }
| ID { $$ = $1; }
| STRING
%empty { $$ = ""; }
| ID { $$ = $1; }
| STRING { $$ = $1; }
;
@@ -706,7 +705,7 @@ string_as_id:
;
epilogue.opt:
/* Nothing. */
%empty
| "%%" EPILOGUE
{
code_props plain_code;