I want to parse a bibtex file using flex and bison, and will display
those data using gtk library(in C). The lexer is
%{
#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); }
%%
and the parser is:
%{
#include <stdio.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <string.h>
#include <glib/gstdio.h>
#include <fcntl.h>
enum
{
COL_BIB_KEY=0,
COL_BIB_TYPE, COL_BIB_AUTHOR, COL_BIB_YEAR,
NUM_COLS} ;
#define slen 1024
GHashTable* table;
GtkTreeIter siter;
GtkListStore *store;
%}
// 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 ','{ g_hash_table_insert(table, g_strdup("TYPE"), g_strdup($2));
g_hash_table_insert(table, g_strdup("ID"), g_strdup($4));
g_printf("%s:%s\n","KEY=>",g_hash_table_lookup(table,"TYPE"));
// g_printf("%s: %s\n", $2, $4);
}
KeyVals '}'
;
KeyVals:
/* empty */
| KeyVals KeyVal ; /* zero or more keyvals */
KeyVal:
KEY '=' VALUE ',' { g_hash_table_insert(table, g_strdup($1), g_strdup($3));
// g_printf("%s: %s\n", $1, $3);
};
%%
int yyerror(char *s) {
printf("yyerror : %s\n",s);
}
int main(int argc, char** argv) {
gtk_init(&argc, &argv);
GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
GtkWidget *tree=gtk_tree_view_new();
setup_tree(tree);
gtk_container_add (GTK_CONTAINER (window), tree);
store= gtk_list_store_new (NUM_COLS,
G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING);
table = g_hash_table_new(g_str_hash, g_str_equal);
gint i;
do{
g_hash_table_remove_all (table);
yyparse();
parse_entry (table);
gtk_tree_view_set_model (GTK_TREE_VIEW (tree), GTK_TREE_MODEL (store));
g_object_unref (store);
}
while(!EOF);
g_hash_table_destroy (table);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
void parse_entry (GHashTable *table)
{
GHashTableIter iter;
gchar *key, *val;
char *keys[] = {"id", "type", "author", "year", "title", "publisher", "editor",
"volume", "number", "pages", "month", "note", "address", "edition", "journal",
"series", "book", "chapter", "organization", NULL};
char *vals[] = {NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL};
gchar **kiter;
gint i;
g_hash_table_iter_init (&iter, table);
while (g_hash_table_iter_next (&iter, (void **)&key, (void **)&val))
{
for (kiter = keys, i = 0; *kiter; kiter++, i++)
{
if (!g_ascii_strcasecmp(*kiter, key))
{
vals[i] = g_strndup(val,slen);
// g_printf("%s:%s\n",keys[i],g_hash_table_lookup(table,keys[i]));
g_printf("%d=>%s:%s\n",i,keys[i],vals[i]);
break;
}
}
}
gtk_list_store_append (store, &siter);
gtk_list_store_set (store, &siter,
COL_BIB_TYPE, vals[COL_BIB_TYPE],
COL_BIB_KEY, vals[COL_BIB_KEY],
COL_BIB_AUTHOR, vals[COL_BIB_AUTHOR],
COL_BIB_YEAR, vals[COL_BIB_YEAR],
-1);
}
void setup_tree(GtkWidget *tree){
GtkCellRenderer *renderer;
GtkTreeViewColumn *column;
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes
("Type", renderer, "text",COL_BIB_TYPE , NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes
("Author", renderer, "text", COL_BIB_AUTHOR, NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes
("Year", renderer, "text",COL_BIB_YEAR, NULL);
gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
g_printf("HIIIIIIIIIi");
}
The problem is on populating the hash table, and not the listview(I
enclosed the list store so that people can see my final goal and suggest
improvements.)
If we put the line
g_printf("%s:%s\n",$1,g_hash_table_lookup(table,$1));
at line number 50, it prints the hash table's content correctly, but if
we want the content by uncommenting line number 105, then only the last
entry is parsed. So, my guess is I am not processing the hash file
correctly (line no 97-107 may be?)
The makefile is:
CC=gcc -g
FLEX=flex
BISON=bison
LIBS=lfl
PROG=parse
${PROG}:bib.y bib.l
${BISON} -d bib.y
${FLEX} -i bib.l
${CC} lex.yy.c bib.tab.c `pkg-config --cflags --libs glib-2.0``pkg-config --cflags --libs gtk+-3.0`
-${LIBS} -o $@
clean:
rm -f lex.yy.c bib.tab.c ${PROG}
touch bib.l bib.y
and a sample bibtex file is:
@Book{a1,
Title="ASR",
Publisher="oxf",
author = "a {\"m}ook, Rudra Banerjee",
Year="2010",
Address="UK",
Edition="1",
}
@Booklet{ab19,
Author="Rudra Banerjee and A. Mookerjee",
Title="Fe{\"Ni}Mo",
Editor="sm1",
Title="sm2",
Publisher="sm3",
Volume="sm4",
Number="sm5",
Pages="sm6",
Month="sm8",
Note="sm9",
Key="sm10",
Year="1980",
Address="osm1",
Edition="osm2",
}
I will be grateful if someone shows me some way to populate the
hashtable correctly. Please help.
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