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< 0) { /* * didn't find a qualifying character, so remove * all trailing [+-] */ do { nchars--; } while (nchars >

1 & & (yytext [nchars-1] = ='+'| | yytext [nchars-1] = ='-'));}} SET_YYLLOC (); if (nchars

< yyleng) { /* Strip the unwanted chars from the token */ yyless(nchars); /* * If what we have left is only one char, and it's * one of the characters matching "self", then * return it as a character token the same way * that the "self" rule would have. */ if (nchars == 1 && strchr(",()[].;:+-*/%^=", yytext[0])) return yytext[0]; /* * Likewise, if what we have left is two chars, and * those match the tokens ">

= ",", "or *"! = " Then we must return the appropriate token * rather than the generic Op. * / if (nchars = = 2) {if (yytext [0] = ='='& & yytext [1] = ='>') return EQUALS_GREATER If (yytext [0] = ='>'& & yytext [1] = ='=') return GREATER_EQUALS; if (yytext [0] = = 'str = pstrdup (yytext); return FCONST } {realfail2} {/ * throw back the [Ee] [+ -], and proceed as above * / yyless (yyleng-2); SET_YYLLOC (); yylval- > str = pstrdup (yytext); return FCONST } {identifier} {/ /-Identifier const ScanKeyword * keyword; char * ident; SET_YYLLOC (); / * Is it a keyword? * / / is it a keyword? Keyword = ScanKeywordLookup (yytext, yyextra- > keywords, yyextra- > num_keywords) If (keyword! = NULL) {/ / Yes, the key value yylval- > keyword = keyword- > name; return keyword- > value;} / * * No is returned. Convert the identifier to lower case, and truncate * if necessary. * / / if it is not a keyword, set it to lowercase and truncate ident = downcase_truncate_identifier (yytext, yyleng, true) if necessary; yylval- > str = ident; return IDENT;} {other} {SET_YYLLOC () Return yytext [0];} {SET_YYLLOC (); yyterminate ();}% "what's the purpose of Rules in PostgreSQL"? thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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