/* Reading PO files, abstract class.
   Copyright (C) 1995-1996, 1998, 2000-2003, 2005-2006, 2008-2009, 2012,
   2015-2016 Free Software Foundation, Inc.

   This file was written by Peter Miller <millerp@canb.auug.org.au>

   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 _READ_CATALOG_ABSTRACT_H
#define _READ_CATALOG_ABSTRACT_H

#include "po-lex.h"
#include "message.h"

#include <stdbool.h>


#ifdef __cplusplus
extern "C" {
#endif


/* Note: the _t suffix is reserved by ANSI C, so the _ty suffix is
   used to indicate a type name.  */

/* The following pair of structures cooperate to create an "Object" in
   the OO sense.  We are simply doing it manually, rather than with the
   help of an OO compiler.  This implementation allows polymorphism
   and inheritance - more than enough for the immediate needs.  */

/* Forward declaration.  */
struct abstract_catalog_reader_ty;


/* This first structure, playing the role of the "Class" in OO sense,
   contains pointers to functions.  Each function is a method for the
   class (base or derived).  Use a NULL pointer where no action is
   required.  */

typedef struct abstract_catalog_reader_class_ty
        abstract_catalog_reader_class_ty;
struct abstract_catalog_reader_class_ty
{
  /* how many bytes to malloc for an instance of this class */
  size_t size;

  /* what to do immediately after the instance is malloc()ed */
  void (*constructor) (struct abstract_catalog_reader_ty *pop);

  /* what to do immediately before the instance is free()ed */
  void (*destructor) (struct abstract_catalog_reader_ty *pop);

  /* This method is invoked before the parse, but after the file is
     opened by the lexer.  */
  void (*parse_brief) (struct abstract_catalog_reader_ty *pop);

  /* This method is invoked after the parse, but before the file is
     closed by the lexer.  The intention is to make consistency checks
     against the file here, and emit the errors through the lex_error*
     functions.  */
  void (*parse_debrief) (struct abstract_catalog_reader_ty *pop);

  /* what to do with a domain directive */
  void (*directive_domain) (struct abstract_catalog_reader_ty *pop, char *name);

  /* what to do with a message directive */
  void (*directive_message) (struct abstract_catalog_reader_ty *pop,
                             char *msgctxt,
                             char *msgid, lex_pos_ty *msgid_pos,
                             char *msgid_plural,
                             char *msgstr, size_t msgstr_len,
                             lex_pos_ty *msgstr_pos,
                             char *prev_msgctxt,
                             char *prev_msgid, char *prev_msgid_plural,
                             bool force_fuzzy, bool obsolete);

  /* What to do with a plain-vanilla comment - the expectation is that
     they will be accumulated, and added to the next message
     definition seen.  Or completely ignored.  */
  void (*comment) (struct abstract_catalog_reader_ty *pop, const char *s);

  /* What to do with a comment that starts with a dot (i.e.  extracted
     by xgettext) - the expectation is that they will be accumulated,
     and added to the next message definition seen.  Or completely
     ignored.  */
  void (*comment_dot) (struct abstract_catalog_reader_ty *pop, const char *s);

  /* What to do with a file position seen in a comment (i.e. a message
     location comment extracted by xgettext) - the expectation is that
     they will be accumulated, and added to the next message
     definition seen.  Or completely ignored.  */
  void (*comment_filepos) (struct abstract_catalog_reader_ty *pop,
                           const char *s, size_t line);

  /* What to do with a comment that starts with a ',' or '!' - this is a
     special comment.  One of the possible uses is to indicate a
     inexact translation.  */
  void (*comment_special) (struct abstract_catalog_reader_ty *pop,
                           const char *s);
};


/* This next structure defines the base class passed to the methods.
   Derived methods will often need to cast their first argument before
   using it (this corresponds to the implicit 'this' argument in C++).

   When declaring derived classes, use the ABSTRACT_CATALOG_READER_TY define
   at the start of the structure, to declare inherited instance variables,
   etc.  */

#define ABSTRACT_CATALOG_READER_TY \
  abstract_catalog_reader_class_ty *methods;

typedef struct abstract_catalog_reader_ty abstract_catalog_reader_ty;
struct abstract_catalog_reader_ty
{
  ABSTRACT_CATALOG_READER_TY
};


/* This structure describes a textual catalog input format.  */
struct catalog_input_format
{
  /* Parses the contents of FP, invoking the appropriate callbacks.  */
  void (*parse) (abstract_catalog_reader_ty *pop, FILE *fp,
                 const char *real_filename, const char *logical_filename);

  /* Whether the parse function always produces messages encoded in UTF-8
     encoding.  */
  bool produces_utf8;
};

typedef const struct catalog_input_format * catalog_input_format_ty;


/* Allocate a fresh abstract_catalog_reader_ty (or derived class) instance and
   call its constructor.  */
extern abstract_catalog_reader_ty *
       catalog_reader_alloc (abstract_catalog_reader_class_ty *method_table);

/* Read a PO file from a stream, and dispatch to the various
   abstract_catalog_reader_class_ty methods.  */
extern void
       catalog_reader_parse (abstract_catalog_reader_ty *pop, FILE *fp,
                             const char *real_filename,
                             const char *logical_filename,
                             catalog_input_format_ty input_syntax);

/* Call the destructor and deallocate a abstract_catalog_reader_ty (or derived
   class) instance.  */
extern void
       catalog_reader_free (abstract_catalog_reader_ty *pop);


/* Callbacks used by po-gram.y or po-lex.c, indirectly from
   catalog_reader_parse.  */
extern void po_callback_domain (char *name);
extern void po_callback_message (char *msgctxt,
                                 char *msgid, lex_pos_ty *msgid_pos,
                                 char *msgid_plural,
                                 char *msgstr, size_t msgstr_len,
                                 lex_pos_ty *msgstr_pos,
                                 char *prev_msgctxt,
                                 char *prev_msgid, char *prev_msgid_plural,
                                 bool force_fuzzy, bool obsolete);
extern void po_callback_comment (const char *s);
extern void po_callback_comment_dot (const char *s);
extern void po_callback_comment_filepos (const char *s, size_t line);
extern void po_callback_comment_special (const char *s);
extern void po_callback_comment_dispatcher (const char *s);

/* Parse a special comment and put the result in *fuzzyp, formatp, *rangep,
   *wrapp.  */
extern void po_parse_comment_special (const char *s, bool *fuzzyp,
                                      enum is_format formatp[NFORMATS],
                                      struct argument_range *rangep,
                                      enum is_wrap *wrapp,
                                      enum is_syntax_check scp[NSYNTAXCHECKS]);


#ifdef __cplusplus
}
#endif


#endif /* _READ_CATALOG_ABSTRACT_H */
