src/dev-html/html-text.h

   1 /*@ Provides a state machine interface which generates html text.
   2  *
   3  * Copyright (c) 2014 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   4  *
   5  * Copyright (C) 2000 - 2005, 2007
   6  * Free Software Foundation, Inc.
   7  *
   8  *  Gaius Mulley (gaius@glam.ac.uk) wrote html-text.h
   9  */
  10 /*
  11  * groff is free software; you can redistribute it and/or modify it under
  12  * the terms of the GNU General Public License as published by the Free
  13  * Software Foundation; either version 2, or (at your option) any later
  14  * version.
  15  *
  16  * groff is distributed in the hope that it will be useful, but WITHOUT ANY
  17  * WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  * for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with groff; see the file COPYING.  If not, write to the Free Software
  23  * Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
  24  */
  25 #ifndef _HTML_TEXT_H
  26 #define _HTML_TEXT_H
  27
  28 #include "html.h"
  29
  30 #include "html-table.h"
  31
  32 /*
  33  *  supported html dialects.
  34  */
  35
  36 typedef enum {xhtml, html4} html_dialect;
  37
  38 /*
  39  *  html tags
  40  */
  41
  42 typedef enum {I_TAG, B_TAG, P_TAG, SUB_TAG, SUP_TAG, TT_TAG,
  43               PRE_TAG, SMALL_TAG, BIG_TAG, BREAK_TAG,
  44               COLOR_TAG} HTML_TAG;
  45
  46 typedef struct tag_definition {
  47   HTML_TAG        type;
  48   void           *arg1;
  49   int             text_emitted;
  50   color           col;
  51   html_indent    *indent;
  52   tag_definition *next;
  53 } tag_definition ;
  54
  55 /*
  56  *  the state of the current paragraph.
  57  *  It allows post-html.cpp to request font changes, paragraph start/end
  58  *  and emits balanced tags with a small amount of peephole optimization.
  59  */
  60
  61 class html_text {
  62 public:
  63          html_text         (simple_output *op, html_dialect d);
  64         ~html_text         (void);
  65   void   flush_text        (void);
  66   void   do_emittext       (const char *s, int length);
  67   void   do_italic         (void);
  68   void   do_bold           (void);
  69   void   do_roman          (void);
  70   void   do_tt             (void);
  71   void   do_pre            (void);
  72   void   do_small          (void);
  73   void   do_big            (void);
  74   void   do_para           (const char *arg, int space); // used for no indentation
  75   void   do_para           (simple_output *op, const char *arg1,
  76                             int indentation, int pageoffset, int linelength,
  77                             int space);
  78   void   do_sup            (void);
  79   void   do_sub            (void);
  80   void   do_space          (void);
  81   void   do_break          (void);
  82   void   do_newline        (void);
  83   void   do_table          (const char *arg);
  84   void   done_bold         (void);
  85   void   done_italic       (void);
  86   char  *done_para         (void);
  87   void   done_sup          (void);
  88   void   done_sub          (void);
  89   void   done_tt           (void);
  90   void   done_pre          (void);
  91   void   done_small        (void);
  92   void   done_big          (void);
  93   void   do_color          (color *c);
  94   void   done_color        (void);
  95   int    emitted_text      (void);
  96   int    ever_emitted_text (void);
  97   int    starts_with_space (void);
  98   int    retrieve_para_space (void);
  99   void   emit_space        (void);
 100   int    is_in_pre         (void);
 101   int    uses_indent       (void);
 102   void   remove_tag        (HTML_TAG tag);
 103   void   remove_sub_sup    (void);
 104   void   remove_para_align (void);
 105   void   remove_para_space (void);
 106   char  *get_alignment     (void);
 107
 108 private:
 109   tag_definition   *stackptr;    /* the current paragraph state */
 110   tag_definition   *lastptr;     /* the end of the stack        */
 111   simple_output    *out;
 112   html_dialect      dialect;     /* which dialect of html?      */
 113   int               space_emitted;   /* just emitted a space?   */
 114   int               current_indentation;   /* current .in value */
 115   int               pageoffset;            /* .po value         */
 116   int               linelength;          /* current line length */
 117   int               blank_para;   /* have we ever written text? */
 118   int               start_space;  /* does para start with a .sp */
 119   html_indent      *indent;                 /* our indent class */
 120
 121   int    is_present          (HTML_TAG t);
 122   void   end_tag             (tag_definition *t);
 123   void   start_tag           (tag_definition *t);
 124   void   do_para             (const char *arg, html_indent *in, int space);
 125   void   push_para           (HTML_TAG t);
 126   void   push_para           (HTML_TAG t, void *arg, html_indent *in);
 127   void   push_para           (color *c);
 128   void   do_push             (tag_definition *p);
 129   char  *shutdown            (HTML_TAG t);
 130   void   check_emit_text     (tag_definition *t);
 131   int    remove_break        (void);
 132   void   issue_tag           (const char *tagname, const char *arg, int space=2);
 133   void   issue_color_begin   (color *c);
 134   void   remove_def          (tag_definition *t);
 135   html_indent *remove_indent (HTML_TAG tag);
 136   void   dump_stack_element  (tag_definition *p);
 137   void   dump_stack          (void);
 138 };
 139
 140 #endif // _HTML_TEXT_H
 141 // s-it2-mode