LCOV - code coverage report
Current view: top level - contrib/seg - segscan.l (source / functions) Hit Total Coverage
Test: PostgreSQL 17devel Lines: 20 20 100.0 %
Date: 2024-03-29 05:11:05 Functions: 3 3 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : %top{
       2             : /*
       3             :  * A scanner for EMP-style numeric ranges
       4             :  */
       5             : #include "postgres.h"
       6             : 
       7             : #include "nodes/miscnodes.h"
       8             : 
       9             : /*
      10             :  * NB: include segparse.h only AFTER including segdata.h, because segdata.h
      11             :  * contains the definition for SEG.
      12             :  */
      13             : #include "segdata.h"
      14             : #include "segparse.h"
      15             : }
      16             : 
      17             : %{
      18             : /* LCOV_EXCL_START */
      19             : 
      20             : /* No reason to constrain amount of data slurped */
      21             : #define YY_READ_BUF_SIZE 16777216
      22             : 
      23             : /* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
      24             : #undef fprintf
      25             : #define fprintf(file, fmt, msg)  fprintf_to_ereport(fmt, msg)
      26             : 
      27             : static void
      28             : fprintf_to_ereport(const char *fmt, const char *msg)
      29             : {
      30             :     ereport(ERROR, (errmsg_internal("%s", msg)));
      31             : }
      32             : 
      33             : /* Handles to the buffer that the lexer uses internally */
      34             : static YY_BUFFER_STATE scanbufhandle;
      35             : static char *scanbuf;
      36             : %}
      37             : 
      38             : %option 8bit
      39             : %option never-interactive
      40             : %option nodefault
      41             : %option noinput
      42             : %option nounput
      43             : %option noyywrap
      44             : %option warn
      45             : %option prefix="seg_yy"
      46             : 
      47             : 
      48             : range        (\.\.)(\.)?
      49             : plumin       (\'\+\-\')|(\(\+\-)\)
      50             : integer      [+-]?[0-9]+
      51             : real         [+-]?[0-9]+\.[0-9]+
      52             : float        ({integer}|{real})([eE]{integer})?
      53             : 
      54             : %%
      55             : 
      56             : {range}      seg_yylval.text = yytext; return RANGE;
      57             : {plumin}     seg_yylval.text = yytext; return PLUMIN;
      58             : {float}      seg_yylval.text = yytext; return SEGFLOAT;
      59             : \<           seg_yylval.text = "<"; return EXTENSION;
      60             : \>           seg_yylval.text = ">"; return EXTENSION;
      61             : \~           seg_yylval.text = "~"; return EXTENSION;
      62             : [ \t\n\r\f\v]+ /* discard spaces */
      63             : .            return yytext[0]; /* alert parser of the garbage */
      64             : 
      65             : %%
      66             : 
      67             : /* LCOV_EXCL_STOP */
      68             : 
      69             : void
      70          44 : seg_yyerror(SEG *result, struct Node *escontext, const char *message)
      71             : {
      72             :     /* if we already reported an error, don't overwrite it */
      73          44 :     if (SOFT_ERROR_OCCURRED(escontext))
      74          16 :         return;
      75             : 
      76          28 :     if (*yytext == YY_END_OF_BUFFER_CHAR)
      77             :     {
      78           6 :         errsave(escontext,
      79             :                 (errcode(ERRCODE_SYNTAX_ERROR),
      80             :                  errmsg("bad seg representation"),
      81             :                  /* translator: %s is typically "syntax error" */
      82             :                  errdetail("%s at end of input", message)));
      83             :     }
      84             :     else
      85             :     {
      86          22 :         errsave(escontext,
      87             :                 (errcode(ERRCODE_SYNTAX_ERROR),
      88             :                  errmsg("bad seg representation"),
      89             :                  /* translator: first %s is typically "syntax error" */
      90             :                  errdetail("%s at or near \"%s\"", message, yytext)));
      91             :     }
      92             : }
      93             : 
      94             : 
      95             : /*
      96             :  * Called before any actual parsing is done
      97             :  */
      98             : void
      99        5646 : seg_scanner_init(const char *str)
     100             : {
     101        5646 :     Size    slen = strlen(str);
     102             : 
     103             :     /*
     104             :      * Might be left over after ereport()
     105             :      */
     106        5646 :     if (YY_CURRENT_BUFFER)
     107          18 :         yy_delete_buffer(YY_CURRENT_BUFFER);
     108             : 
     109             :     /*
     110             :      * Make a scan buffer with special termination needed by flex.
     111             :      */
     112        5646 :     scanbuf = palloc(slen + 2);
     113        5646 :     memcpy(scanbuf, str, slen);
     114        5646 :     scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
     115        5646 :     scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
     116             : 
     117        5646 :     BEGIN(INITIAL);
     118        5646 : }
     119             : 
     120             : 
     121             : /*
     122             :  * Called after parsing is done to clean up after seg_scanner_init()
     123             :  */
     124             : void
     125        5628 : seg_scanner_finish(void)
     126             : {
     127        5628 :     yy_delete_buffer(scanbufhandle);
     128        5628 :     pfree(scanbuf);
     129        5628 : }

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