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/* configparser.l
Parser for configuration file
(C) 1999 Stanislav Meduna <stano@eunet.sk>
The format of the file is
[section]
entry = value...
entry[qualif] = value...
The parser is rather primitive and takes all values
as simple strings - no quoting or something like that
is possible.
The caller gets the entries via callback.
*/
string \"[^\n"]+\"
name [A-Za-z/_][A-Za-z0-9/_()]*
combegin "#"|"//"
lbracket "["
rbracket "]"
equal "="
white [[:blank:]]
%s COMMENT ENTRY VALUES
%option prefix="configparser"
%option outfile="lex.yy.c"
%option noyywrap
%option yylineno
%{
#include <config.h>
#include <configuration.h>
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <libintl.h>
#define _(s) dgettext(PACKAGE, s)
static char section[32];
static config_entry_t *entry = 0;
static void reset_entry(void)
{
free_config_entry(entry);
entry = 0;
}
static void got_section(const char *str)
{
str++;
strncpy(section, str, sizeof(section)-1);
section[sizeof(section)-1] = 0;
section[strlen(section)-1] = 0;
}
static void got_entry(const char *str)
{
entry = (config_entry_t *) malloc(sizeof(config_entry_t));
if (entry == NULL)
{
fprintf(stderr, _("Out of memory"));
return;
}
strncpy(entry->section, section, sizeof(entry->section)-1);
entry->section[sizeof(entry->section)-1] = 0;
strncpy(entry->entry, str, sizeof(entry->entry)-1);
entry->entry[sizeof(entry->entry)-1] = 0;
*entry->qualif = 0;
entry->nvalues = 0;
}
static void got_optional(const char *str)
{
if (! entry)
return;
if (*entry->qualif != 0)
{
fprintf(stderr, _("Second qualifier ignored on line %d\n"), yylineno);
return;
}
str++;
strncpy(entry->qualif, str, sizeof(entry->qualif)-1);
entry->qualif[sizeof(entry->qualif)-1] = 0;
entry->qualif[strlen(entry->qualif)-1] = 0;
}
static void got_value(const char *str)
{
int n;
if (! entry)
return;
if (entry->nvalues >= sizeof(entry->values)/sizeof(entry->values[0]))
{
fprintf(stderr, _("Excessive values ignored on line %d\n"), yylineno);
return;
}
if (*str == '\"')
str++; /* skip quote */
n = strlen(str);
if (n)
n--;
entry->values[entry->nvalues] = strdup(str);
if (entry->values[entry->nvalues] == NULL)
{
fprintf(stderr, _("Out of memory"));
return;
}
if (str[n] == '\"')
entry->values[entry->nvalues][n] = 0;
entry->nvalues++;
}
static void got_all(void)
{
if (! entry)
return;
config_entry_cb(entry);
entry = 0;
}
static void syntax_error()
{
fprintf(stderr, _("Syntax error in configuration at line %d\n"), yylineno);
reset_entry();
}
%}
%%
{ BEGIN(INITIAL); entry = 0; *section = 0; }
<INITIAL>{combegin} { BEGIN(COMMENT); }
<INITIAL>{white} ;
<INITIAL>\n ;
<INITIAL>{lbracket}{name}{rbracket} { got_section(yytext); BEGIN(COMMENT); }
<INITIAL>{name} { got_entry(yytext); BEGIN(ENTRY); }
<INITIAL>. { syntax_error(); BEGIN(COMMENT); }
<ENTRY>{lbracket}{name}{rbracket} { got_optional(yytext); }
<ENTRY>{equal} { BEGIN(VALUES); }
<ENTRY>{white} ;
<ENTRY>. { syntax_error(); BEGIN(COMMENT); }
<ENTRY>\n { syntax_error(); BEGIN(INITIAL); }
<VALUES>\n { got_all(); BEGIN(INITIAL); }
<VALUES>{white} ;
<VALUES>{name} { got_value(yytext); }
<VALUES>{string} { got_value(yytext); }
<VALUES>. { syntax_error(); BEGIN(COMMENT); }
<COMMENT>. ;
<COMMENT>\n { reset_entry(); BEGIN(INITIAL); }
%%
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