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// -*- C++ -*-
/* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
 * Free Software Foundation, Inc.
 *
 *  Gaius Mulley (gaius@glam.ac.uk) wrote html-text.h
 *
 *  html-text.h
 *
 *  provides a state machine interface which generates html text.
 */

/*
This file is part of groff.

groff 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 2, or (at your option) any later
version.

groff 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 groff; see the file COPYING.  If not, write to the Free Software
Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */

#include "html.h"
#include "html-table.h"

#define STYLE_VERTICAL_SPACE "1em"

/*
 *  html tags
 */

typedef enum {I_TAG, B_TAG, P_TAG, SUB_TAG, SUP_TAG, TT_TAG,
	      PRE_TAG, SMALL_TAG, BIG_TAG, BREAK_TAG,
	      COLOR_TAG} HTML_TAG;

typedef struct tag_definition {
  HTML_TAG        type;
  void           *arg1;
  int             text_emitted;
  color           col;
  html_indent    *indent;
  tag_definition *next;
} tag_definition ;

/*
 *  the state of the current paragraph.
 *  It allows post-html.cpp to request font changes, paragraph start/end
 *  and emits balanced tags with a small amount of peephole optimization.
 */

class html_text {
public:
         html_text         (simple_output *op);
        ~html_text         (void);
  void   flush_text        (void);
  void   do_emittext       (const char *s, int length);
  void   do_italic         (void);
  void   do_bold           (void);
  void   do_roman          (void);
  void   do_tt             (void);
  void   do_pre            (void);
  void   do_small          (void);
  void   do_big            (void);
  void   do_para           (const char *arg, int space); // used for no indentation
  void   do_para           (simple_output *op, const char *arg1,
			    int indentation, int pageoffset, int linelength,
                            int space);
  void   do_sup            (void);
  void   do_sub            (void);
  void   do_space          (void);
  void   do_break          (void);
  void   do_newline        (void);
  void   do_table          (const char *arg);
  void   done_bold         (void);
  void   done_italic       (void);
  char  *done_para         (void);
  void   done_sup          (void);
  void   done_sub          (void);
  void   done_tt           (void);
  void   done_pre          (void);
  void   done_small        (void);
  void   done_big          (void);
  void   do_color          (color *c);
  void   done_color        (void);
  int    emitted_text      (void);
  int    ever_emitted_text (void);
  int    starts_with_space (void);
  int    retrieve_para_space (void);
  void   emit_space        (void);
  int    is_in_pre         (void);
  int    uses_indent       (void);
  void   remove_tag        (HTML_TAG tag);
  void   remove_sub_sup    (void);
  void   remove_para_align (void);
  void   remove_para_space (void);
  char  *get_alignment     (void);

private:
  tag_definition   *stackptr;    /* the current paragraph state */
  tag_definition   *lastptr;     /* the end of the stack        */
  simple_output    *out;
  int               space_emitted;   /* just emitted a space?   */
  int               current_indentation;   /* current .in value */
  int               pageoffset;            /* .po value         */
  int               linelength;          /* current line length */
  int               blank_para;   /* have we ever written text? */
  int               start_space;  /* does para start with a .sp */
  html_indent      *indent;                 /* our indent class */

  int    is_present          (HTML_TAG t);
  void   end_tag             (tag_definition *t);
  void   start_tag           (tag_definition *t);
  void   do_para             (const char *arg, html_indent *in, int space);
  void   push_para           (HTML_TAG t);
  void   push_para           (HTML_TAG t, void *arg, html_indent *in);
  void   push_para           (color *c);
  void   do_push             (tag_definition *p);
  char  *shutdown            (HTML_TAG t);
  void   check_emit_text     (tag_definition *t);
  int    remove_break        (void);
  void   issue_tag           (const char *tagname, const char *arg, int space=2);
  void   issue_color_begin   (color *c);
  void   remove_def          (tag_definition *t);
  html_indent *remove_indent (HTML_TAG tag);
  void   dump_stack_element  (tag_definition *p);
  void   dump_stack          (void);
};

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