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ae6d06f096
This commit comes as a continuation of the discussion that has led tod522b05, as \v was handled inconsistently when parsing array values or anything going through the parsers, and changing a parser behavior in stable branches is a scary thing to do. The parsing of array values now uses the more central scanner_isspace() and array_isspace() is removed. As pointing out by Peter Eisentraut, fix a confusing reference to horizontal space in the parsers with the term "horiz_space". \f was included in this set since3cfdd8ffrom 2000, but it is not horizontal. "horiz_space" is renamed to "non_newline_space", to refer to all whitespace characters except newlines. The changes impact the parsers for the backend, psql, seg, cube, ecpg and replication commands. Note that JSON should not escape \v, as per RFC 7159, so these are not touched. Reviewed-by: Peter Eisentraut, Tom Lane Discussion: https://postgr.es/m/ZJKcjNwWHHvw9ksQ@paquier.xyz
134 lines
3.0 KiB
Plaintext
134 lines
3.0 KiB
Plaintext
%top{
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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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/*
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* NB: include cubeparse.h only AFTER defining YYSTYPE (to match cubeparse.y)
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* and cubedata.h for NDBOX.
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*/
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#include "cubedata.h"
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#define YYSTYPE char *
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#include "cubeparse.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="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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infinity [+-]?[iI][nN][fF]([iI][nN][iI][tT][yY])?
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NaN [nN][aA][nN]
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%%
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{float} cube_yylval = yytext; return CUBEFLOAT;
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{infinity} cube_yylval = yytext; return CUBEFLOAT;
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{NaN} cube_yylval = yytext; return CUBEFLOAT;
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\[ cube_yylval = "("; return O_BRACKET;
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\] cube_yylval = ")"; return C_BRACKET;
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\( cube_yylval = "("; return O_PAREN;
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\) cube_yylval = ")"; return C_PAREN;
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\, cube_yylval = ","; return COMMA;
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[ \t\n\r\f\v]+ /* 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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/* result and scanbuflen are not used, but Bison expects this signature */
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void
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cube_yyerror(NDBOX **result, Size scanbuflen,
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struct Node *escontext,
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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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errsave(escontext,
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(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
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errmsg("invalid input syntax for cube"),
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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_INVALID_TEXT_REPRESENTATION),
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errmsg("invalid input syntax for cube"),
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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, Size *scanbuflen)
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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 = 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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