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Add the "%token" control to the lemon parser. Not currently used by SQLite.

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FossilOrigin-Name: a6e4c5ae8f29bc2e7f2088426341254e9281d19db9dc9a14abc376d56dad4c4b
This commit is contained in:
drh
2017-08-02 03:21:11 +00:00
parent 0019881e08
commit 59c435a015
3 changed files with 31 additions and 8 deletions
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25
tool/lemon.c
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@ -2155,7 +2155,8 @@ enum e_state {
WAITING_FOR_FALLBACK_ID,
WAITING_FOR_WILDCARD_ID,
WAITING_FOR_CLASS_ID,
WAITING_FOR_CLASS_TOKEN
WAITING_FOR_CLASS_TOKEN,
WAITING_FOR_TOKEN_NAME
};
struct pstate {
char *filename; /* Name of the input file */
@ -2470,6 +2471,8 @@ to follow the previous rule.");
}else if( strcmp(x,"fallback")==0 ){
psp->fallback = 0;
psp->state = WAITING_FOR_FALLBACK_ID;
}else if( strcmp(x,"token")==0 ){
psp->state = WAITING_FOR_TOKEN_NAME;
}else if( strcmp(x,"wildcard")==0 ){
psp->state = WAITING_FOR_WILDCARD_ID;
}else if( strcmp(x,"token_class")==0 ){
@ -2624,6 +2627,26 @@ to follow the previous rule.");
}
}
break;
case WAITING_FOR_TOKEN_NAME:
/* Tokens do not have to be declared before use. But they can be
** in order to control their assigned integer number. The number for
** each token is assigned when it is first seen. So by including
**
** %token ONE TWO THREE
**
** early in the grammar file, that assigns small consecutive values
** to each of the tokens ONE TWO and THREE.
*/
if( x[0]=='.' ){
psp->state = WAITING_FOR_DECL_OR_RULE;
}else if( !ISUPPER(x[0]) ){
ErrorMsg(psp->filename, psp->tokenlineno,
"%%token argument \"%s\" should be a token", x);
psp->errorcnt++;
}else{
(void)Symbol_new(x);
}
break;
case WAITING_FOR_WILDCARD_ID:
if( x[0]=='.' ){
psp->state = WAITING_FOR_DECL_OR_RULE;