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https://github.com/postgres/postgres.git
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878ce16056
Reviewed by Tom Lane Discussion: https://postgr.es/m/a8dc5700-c341-3ba8-0507-cc09881e6200@dunslane.net
130 lines
2.8 KiB
Plaintext
130 lines
2.8 KiB
Plaintext
%top{
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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 "nodes/miscnodes.h"
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/*
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* NB: include segparse.h only AFTER including segdata.h, because segdata.h
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* contains the definition for SEG.
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*/
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#include "segdata.h"
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#include "segparse.h"
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}
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%{
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/* LCOV_EXCL_START */
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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) fprintf_to_ereport(fmt, msg)
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static void
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fprintf_to_ereport(const char *fmt, const char *msg)
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{
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ereport(ERROR, (errmsg_internal("%s", msg)));
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}
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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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static char *scanbuf;
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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="seg_yy"
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range (\.\.)(\.)?
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plumin (\'\+\-\')|(\(\+\-)\)
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integer [+-]?[0-9]+
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real [+-]?[0-9]+\.[0-9]+
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float ({integer}|{real})([eE]{integer})?
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%%
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{range} seg_yylval.text = yytext; return RANGE;
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{plumin} seg_yylval.text = yytext; return PLUMIN;
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{float} seg_yylval.text = yytext; return SEGFLOAT;
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\< seg_yylval.text = "<"; return EXTENSION;
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\> seg_yylval.text = ">"; return EXTENSION;
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\~ seg_yylval.text = "~"; return EXTENSION;
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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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/* LCOV_EXCL_STOP */
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void
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seg_yyerror(SEG *result, struct Node *escontext, const char *message)
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{
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/* if we already reported an error, don't overwrite it */
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if (SOFT_ERROR_OCCURRED(escontext))
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return;
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if (*yytext == YY_END_OF_BUFFER_CHAR)
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{
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errsave(escontext,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("bad seg 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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errsave(escontext,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("bad seg 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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seg_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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scanbuf = 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 seg_scanner_init()
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*/
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void
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seg_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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