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From: Rudra Banerjee <bnrj.rudra@gmail.com>
Newsgroups: comp.compilers
Subject: Re: parsing bibtex file with flex/bison
Date: Sun, 17 Mar 2013 00:18:50 +0000
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Xref: csiph.com comp.compilers:874

I have managed considerable progress in parsing the bib file, but the
next step is quite tough for my present level of understanding.
I have created bison and flex code, that parses the bib file correctly
(some exceptions may still be there):
$cat bib.y
%{
#include <stdio.h>
%}

// Symbols.
%union
{
	char	*sval;
};
%token <sval> VALUE
%token <sval> KEY
%token OBRACE
%token EBRACE
%token QUOTE
%token SEMICOLON

%start Input
%%
Input:
     /* empty */
     | Input Entry ;  /* input is zero or more entires */
Entry:
     '@' KEY '{' KEY ','{ printf("===========\n%s : %s\n",$2, $4); }
     KeyVals '}'
     ;
KeyVals:
       /* empty */
       | KeyVals KeyVal ; /* zero or more keyvals */
KeyVal:
      KEY '=' VALUE ',' { printf("%s : %s\n",$1, $3); };

%%

int yyerror(char *s) {
  printf("yyerror : %s\n",s);
}

int main(void) {
  yyparse();
}

and
$cat bib.l
%{
#include "bib.tab.h"
%}

%%
[A-Za-z][A-Za-z0-9]*      { yylval.sval = strdup(yytext); return KEY; }
\"([^\"]|\\.)*\"|\{([^\"]|\\.)*\}	  { yylval.sval = strdup(yytext);
return VALUE; }
[ \t\n]                   ; /* ignore whitespace */
[{}@=,]                   { return *yytext; }
.                         { fprintf(stderr, "Unrecognized character %c
in input\n", *yytext); }
%%


I want to have those values in a container. For last few days, I read
the vast documentation of glib and came out with hash container as most
suitable for my case.
Below is a basic hash code, where it have the hashes correctly, once the
values are put in the array keys and vals.
#include <glib.h>
#define slen 1024

int main(gint argc, gchar** argv)
{
  char *keys[] = {"id", "type", "author", "year",NULL};
  char *vals[] = {"one",  "Book",  "RB", "2013", NULL};
  gint i;
  GHashTable* table = g_hash_table_new(g_str_hash, g_str_equal);
  GHashTableIter iter;
  g_hash_table_iter_init (&iter, table);
  for (i= 0; i<=3; i++)
  {
    g_hash_table_insert(table, keys[i],vals[i]);
    g_printf("%d=>%s:%s
\n",i,keys[i],g_hash_table_lookup(table,keys[i]));
  }
}

The problem is, how I integrate this two code, i.e. put the $1, $3 of "
KEY '=' VALUE ',' { printf("%s : %s\n",$1, $3); };" in the hash table.


Any kind help is appreciated.

[If you want to put it in the hash table, you do so, something like
  g_hash_table_insert(table, $1, $3)
-John]