/* Format strings.
   Copyright (C) 2001-2009 Free Software Foundation, Inc.
   Written by Bruno Haible <haible@clisp.cons.org>, 2001.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef _FORMAT_H
#define _FORMAT_H

#include <stdbool.h>

#include "pos.h"        /* Get lex_pos_ty.  */
#include "message.h"    /* Get NFORMATS.  */
#include "plural-distrib.h" /* Get struct plural_distribution.  */
#include "error.h"      /* Get fallback definition of __attribute__.  */


#ifdef __cplusplus
extern "C" {
#endif


/* These indicators are set by the parse function at the appropriate
   positions.  */
enum
{
  /* Set on the first byte of a format directive.  */
  FMTDIR_START  = 1 << 0,
  /* Set on the last byte of a format directive.  */
  FMTDIR_END    = 1 << 1,
  /* Set on the last byte of an invalid format directive, where a parse error
     was recognized.  */
  FMTDIR_ERROR  = 1 << 2
};

/* Macro for use inside a parser:
   Sets an indicator at the position corresponding to PTR.
   Assumes local variables 'fdi' and 'format_start' are defined.  */
#define FDI_SET(ptr, flag) \
  if (fdi != NULL) \
    fdi[(ptr) - format_start] |= (flag)/*;*/

/* This type of callback is responsible for showing an error.  */
typedef void (*formatstring_error_logger_t) (const char *format, ...)
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
     __attribute__ ((__format__ (__printf__, 1, 2)))
#endif
;

/* This structure describes a format string parser for a language.  */
struct formatstring_parser
{
  /* Parse the given string as a format string.
     If translated is true, some extensions available only to msgstr but not
     to msgid strings are recognized.
     If fdi is non-NULL, it must be a an array of strlen (string) zero bytes.
     Return a freshly allocated structure describing
       1. the argument types/names needed for the format string,
       2. the total number of format directives.
     Return NULL if the string is not a valid format string. In this case,
     also set *invalid_reason to an error message explaining why.
     In both cases, set FMTDIR_* bits at the appropriate positions in fdi.  */
  void * (*parse) (const char *string, bool translated, char *fdi, char **invalid_reason);

  /* Free a format string descriptor, returned by parse().  */
  void (*free) (void *descr);

  /* Return the number of format directives.
     A string that can be output literally has 0 format directives.  */
  int (*get_number_of_directives) (void *descr);

  /* Return true if the format string, although valid, contains directives that
     make it appear unlikely that the string was meant as a format string.
     A NULL function is equivalent to a function that always returns false.  */
  bool (*is_unlikely_intentional) (void *descr);

  /* Verify that the argument types/names in msgid_descr and those in
     msgstr_descr are the same (if equality=true), or (if equality=false)
     that those of msgid_descr extend those of msgstr_descr (i.e.
     msgstr_descr may omit some of the arguments of msgid_descr).
     If not, signal an error using error_logger (only if error_logger != NULL)
     and return true.  Otherwise return false.  */
  bool (*check) (void *msgid_descr, void *msgstr_descr, bool equality, formatstring_error_logger_t error_logger, const char *pretty_msgid, const char *pretty_msgstr);
};

/* Format string parsers, each defined in its own file.  */
extern DLL_VARIABLE struct formatstring_parser formatstring_c;
extern DLL_VARIABLE struct formatstring_parser formatstring_objc;
extern DLL_VARIABLE struct formatstring_parser formatstring_sh;
extern DLL_VARIABLE struct formatstring_parser formatstring_python;
extern DLL_VARIABLE struct formatstring_parser formatstring_lisp;
extern DLL_VARIABLE struct formatstring_parser formatstring_elisp;
extern DLL_VARIABLE struct formatstring_parser formatstring_librep;
extern DLL_VARIABLE struct formatstring_parser formatstring_scheme;
extern DLL_VARIABLE struct formatstring_parser formatstring_smalltalk;
extern DLL_VARIABLE struct formatstring_parser formatstring_java;
extern DLL_VARIABLE struct formatstring_parser formatstring_csharp;
extern DLL_VARIABLE struct formatstring_parser formatstring_awk;
extern DLL_VARIABLE struct formatstring_parser formatstring_pascal;
extern DLL_VARIABLE struct formatstring_parser formatstring_ycp;
extern DLL_VARIABLE struct formatstring_parser formatstring_tcl;
extern DLL_VARIABLE struct formatstring_parser formatstring_perl;
extern DLL_VARIABLE struct formatstring_parser formatstring_perl_brace;
extern DLL_VARIABLE struct formatstring_parser formatstring_php;
extern DLL_VARIABLE struct formatstring_parser formatstring_gcc_internal;
extern DLL_VARIABLE struct formatstring_parser formatstring_gfc_internal;
extern DLL_VARIABLE struct formatstring_parser formatstring_qt;
extern DLL_VARIABLE struct formatstring_parser formatstring_qt_plural;
extern DLL_VARIABLE struct formatstring_parser formatstring_kde;
extern DLL_VARIABLE struct formatstring_parser formatstring_boost;

/* Table of all format string parsers.  */
extern DLL_VARIABLE struct formatstring_parser *formatstring_parsers[NFORMATS];

/* Returns an array of the ISO C 99 <inttypes.h> format directives and other
   format flags or directives with a system dependent expansion contained in
   the argument string.  *intervalsp is assigned to a freshly allocated array
   of intervals (startpos pointing to '<', endpos to the character after '>'),
   and *lengthp is assigned to the number of intervals in this array.  */
struct interval
{
  size_t startpos;
  size_t endpos;
};
extern void
       get_sysdep_c_format_directives (const char *string, bool translated,
                                 struct interval **intervalsp, size_t *lengthp);

/* Returns the number of unnamed arguments consumed by a Python format
   string.  */
extern unsigned int get_python_format_unnamed_arg_count (const char *string);

/* Check whether both formats strings contain compatible format
   specifications for format type i (0 <= i < NFORMATS).
   Return the number of errors that were seen.  */
extern int
       check_msgid_msgstr_format_i (const char *msgid, const char *msgid_plural,
                                    const char *msgstr, size_t msgstr_len,
                                    size_t i,
                                    struct argument_range range,
                                    const struct plural_distribution *distribution,
                                    formatstring_error_logger_t error_logger);

/* Check whether both formats strings contain compatible format
   specifications.
   Return the number of errors that were seen.  */
extern int
       check_msgid_msgstr_format (const char *msgid, const char *msgid_plural,
                                  const char *msgstr, size_t msgstr_len,
                                  const enum is_format is_format[NFORMATS],
                                  struct argument_range range,
                                  const struct plural_distribution *distribution,
                                  formatstring_error_logger_t error_logger);


#ifdef __cplusplus
}
#endif


#endif /* _FORMAT_H */
