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In the LEMON parser generator, provide reduce actions with access to the

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lookahead token.

FossilOrigin-Name: 42af190f4f86ad60de02800054010fafd484ac86ca41e2a13799b2e583eea98c
This commit is contained in:
drh
2017-12-15 12:22:21 +00:00
parent 84a6c85c64
commit 087316ceec
3 changed files with 17 additions and 9 deletions
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12
tool/lempar.c
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@ -651,10 +651,18 @@ static void yy_accept(yyParser*); /* Forward Declaration */
/*
** Perform a reduce action and the shift that must immediately
** follow the reduce.
**
** The yyLookahead and yyLookaheadToken parameters provide reduce actions
** access to the lookahead token (if any). The yyLookahead will be YYNOCODE
** if the lookahead token has already been consumed. As this procedure is
** only called from one place, optimizing compilers will in-line it, which
** means that the extra parameters have no performance impact.
*/
static void yy_reduce(
yyParser *yypParser, /* The parser */
unsigned int yyruleno /* Number of the rule by which to reduce */
unsigned int yyruleno, /* Number of the rule by which to reduce */
int yyLookahead, /* Lookahead token, or YYNOCODE if none */
ParseTOKENTYPE yyLookaheadToken /* Value of the lookahead token */
){
int yygoto; /* The next state */
int yyact; /* The next action */
@ -853,7 +861,7 @@ void Parse(
#endif
yymajor = YYNOCODE;
}else if( yyact <= YY_MAX_REDUCE ){
yy_reduce(yypParser,yyact-YY_MIN_REDUCE);
yy_reduce(yypParser,yyact-YY_MIN_REDUCE,yymajor,yyminor);
}else{
assert( yyact == YY_ERROR_ACTION );
yyminorunion.yy0 = yyminor;