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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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C In\svalueFromExpr()\sonly\sgenerate\sa\sOOM\sfault\sif\sthere\shave\sbeen\snow\sprior\nfaults.
D 2017-12-13T23:47:55.478
C In\sthe\sLEMON\sparser\sgenerator,\sprovide\sreduce\sactions\swith\saccess\sto\sthe\nlookahead\stoken.
D 2017-12-15T12:22:21.137
F Makefile.in 6a879cbf01e37f9eac131414955f71774b566502d9a57ded1b8585b507503cb8
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc a2492b29176edc3c754aa7a2f7daa20cd3fa20a56e3ee64e376092836177c42a
@ -1602,7 +1602,7 @@ F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
F tool/kvtest-speed.sh 4761a9c4b3530907562314d7757995787f7aef8f
F tool/lemon.c e6056373044d55296d21f81467dba7632bbb81dc49af072b3f0e76338771497e
F tool/lempar.c 105d0d9cbe5a25d24d4769241ffbfc63ac7c09e6ccee0dc43dcc8a4c4ae4e426
F tool/lempar.c 967ebf585cd09b11b89d255d213865109a9c4ff075680d22580a2826de288c89
F tool/libvers.c caafc3b689638a1d88d44bc5f526c2278760d9b9
F tool/loadfts.c c3c64e4d5e90e8ba41159232c2189dba4be7b862
F tool/logest.c 11346aa019e2e77a00902aa7d0cabd27bd2e8cca
@ -1680,7 +1680,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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42af190f4f86ad60de02800054010fafd484ac86ca41e2a13799b2e583eea98c

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;