116 lines
2.5 KiB
Plaintext
116 lines
2.5 KiB
Plaintext
%{
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/*
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* A scanner for EMP-style numeric ranges
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* contrib/cube/cubescan.l
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*/
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#include "postgres.h"
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#include "knl/knl_variable.h"
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/* No reason to constrain amount of data slurped */
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#define YY_READ_BUF_SIZE 16777216
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/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
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#undef fprintf
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#define fprintf(file, fmt, msg) ereport(ERROR, (errmsg_internal("%s", msg)))
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/* Handles to the buffer that the lexer uses internally */
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static YY_BUFFER_STATE scanbufhandle;
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/* this is now declared in cubeparse.y: */
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/* static char *scanbuf; */
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/* static int scanbuflen; */
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/* flex 2.5.4 doesn't bother with a decl for this */
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int cube_yylex(void);
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void cube_scanner_init(const char *str);
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void cube_scanner_finish(void);
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%}
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%option 8bit
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%option never-interactive
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%option nodefault
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%option noinput
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%option nounput
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%option noyywrap
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%option warn
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%option prefix="cube_yy"
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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 CUBEFLOAT;
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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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[ \t\n\r\f]+ /* discard spaces */
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. return yytext[0]; /* alert parser of the garbage */
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%%
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void
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yyerror(const char *message)
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{
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if (*yytext == YY_END_OF_BUFFER_CHAR)
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{
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("bad cube representation"),
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/* translator: %s is typically "syntax error" */
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errdetail("%s at end of input", message)));
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}
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else
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{
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("bad cube representation"),
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/* translator: first %s is typically "syntax error" */
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errdetail("%s at or near \"%s\"", message, yytext)));
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}
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}
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/*
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* Called before any actual parsing is done
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*/
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void
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cube_scanner_init(const char *str)
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{
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Size slen = strlen(str);
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/*
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* Might be left over after ereport()
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*/
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if (YY_CURRENT_BUFFER)
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yy_delete_buffer(YY_CURRENT_BUFFER);
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/*
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* Make a scan buffer with special termination needed by flex.
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*/
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scanbuflen = slen;
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scanbuf = (char*)palloc(slen + 2);
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memcpy(scanbuf, str, slen);
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scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
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scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
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BEGIN(INITIAL);
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}
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/*
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* Called after parsing is done to clean up after cube_scanner_init()
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*/
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void
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cube_scanner_finish(void)
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{
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yy_delete_buffer(scanbufhandle);
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pfree(scanbuf);
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}
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