101 lines
1.5 KiB
Plaintext
101 lines
1.5 KiB
Plaintext
/**
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* lexer
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*
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*
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*/
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/***************************
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** Section 1: Definitions
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***************************/
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%{
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#include "Statement.h"
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#include "List.h"
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#include "bison_parser.h"
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#include <stdio.h>
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#define TOKEN(name) { return SQL_##name; }
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%}
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/***************************
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** Section 2: Rules
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***************************/
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/* Define the output files */
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%option header-file="flex_lexer.h"
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%option outfile="flex_lexer.cpp"
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/* Make reentrant */
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%option reentrant
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%option bison-bridge
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/* performance tweeks */
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%option never-interactive
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%option batch
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/* other flags */
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%option noyywrap
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%option warn
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%option case-insensitive
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/* %option nodefault */
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/***************************
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** Section 3: Rules
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***************************/
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%%
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[ \t\n]+ /* skip whitespace */;
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SELECT TOKEN(SELECT)
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FROM TOKEN(FROM)
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GROUP TOKEN(GROUP)
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BY TOKEN(BY)
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WHERE TOKEN(WHERE)
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NOT TOKEN(NOT)
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AND TOKEN(AND)
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OR TOKEN(OR)
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"=" TOKEN(EQUALS)
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"<>" TOKEN(NOTEQUALS)
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"<" TOKEN(LESS)
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">" TOKEN(GREATER)
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"<=" TOKEN(LESSEQ)
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">=" TOKEN(GREATEREQ)
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[-+*/(),.;] { return yytext[0]; }
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[0-9]+ |
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[0-9]+"."[0-9]* |
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"."[0-9]* {
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yylval->number = atof(yytext);
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return SQL_FLOAT;
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}
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[A-Za-z][A-Za-z0-9_]* {
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yylval->sval = strdup(yytext);
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return SQL_NAME;
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}
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'[^'\n]*' {
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yylval->sval = strdup(yytext);
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return SQL_STRING;
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}
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%%
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/***************************
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** Section 3: User code
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***************************/
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int yyerror(const char *msg) {
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fprintf(stderr, "[Error] SQL Lexer: %s\n",msg); return 0;
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} |