60 lines
1.4 KiB
Plaintext
60 lines
1.4 KiB
Plaintext
%{
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/*
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** A scanner for EMP-style numeric ranges
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*/
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#include "postgres.h"
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#include "buffer.h"
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/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
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#define fprintf(file, fmt, msg) ereport(ERROR, (errmsg_internal("%s", msg)))
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/* flex screws a couple symbols when used with the -P option; fix those */
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#define YY_DECL int cube_yylex YY_PROTO(( void )); \
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int cube_yylex YY_PROTO(( void ))
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#define yylval cube_yylval
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/* redefined YY_INPUT reads byte-wise from the memory area defined in buffer.c */
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#undef YY_INPUT
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#define YY_INPUT(buf,result,max_size) \
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{ \
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int c = read_parse_buffer(); \
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result = (c == '\0') ? YY_NULL : (buf[0] = c, 1); \
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}
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void cube_flush_scanner_buffer(void);
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%}
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%option 8bit
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%option never-interactive
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%option nounput
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%option noyywrap
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n [0-9]+
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integer [+-]?{n}
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real [+-]?({n}\.{n}?|\.{n})
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float ({integer}|{real})([eE]{integer})?
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%%
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{float} yylval = yytext; return FLOAT;
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\[ yylval = "("; return O_BRACKET;
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\] yylval = ")"; return C_BRACKET;
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\( yylval = "("; return O_PAREN;
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\) yylval = ")"; return C_PAREN;
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\, yylval = ")"; return COMMA;
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[ ]+ /* discard spaces */
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. return yytext[0]; /* alert parser of the garbage */
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%%
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int cube_yylex();
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void cube_flush_scanner_buffer(void) {
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YY_FLUSH_BUFFER;
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}
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