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      1 /*	$NetBSD: html-text.h,v 1.1.1.1 2016/01/13 18:41:49 christos Exp $	*/
      2 
      3 // -*- C++ -*-
      4 /* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
      5  * Free Software Foundation, Inc.
      6  *
      7  *  Gaius Mulley (gaius (at) glam.ac.uk) wrote html-text.h
      8  *
      9  *  html-text.h
     10  *
     11  *  provides a state machine interface which generates html text.
     12  */
     13 
     14 /*
     15 This file is part of groff.
     16 
     17 groff is free software; you can redistribute it and/or modify it under
     18 the terms of the GNU General Public License as published by the Free
     19 Software Foundation; either version 2, or (at your option) any later
     20 version.
     21 
     22 groff is distributed in the hope that it will be useful, but WITHOUT ANY
     23 WARRANTY; without even the implied warranty of MERCHANTABILITY or
     24 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     25 for more details.
     26 
     27 You should have received a copy of the GNU General Public License along
     28 with groff; see the file COPYING.  If not, write to the Free Software
     29 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
     30 
     31 #include "html.h"
     32 #include "html-table.h"
     33 
     34 #define STYLE_VERTICAL_SPACE "1em"
     35 
     36 /*
     37  *  html tags
     38  */
     39 
     40 typedef enum {I_TAG, B_TAG, P_TAG, SUB_TAG, SUP_TAG, TT_TAG,
     41 	      PRE_TAG, SMALL_TAG, BIG_TAG, BREAK_TAG,
     42 	      COLOR_TAG} HTML_TAG;
     43 
     44 typedef struct tag_definition {
     45   HTML_TAG        type;
     46   void           *arg1;
     47   int             text_emitted;
     48   color           col;
     49   html_indent    *indent;
     50   tag_definition *next;
     51 } tag_definition ;
     52 
     53 /*
     54  *  the state of the current paragraph.
     55  *  It allows post-html.cpp to request font changes, paragraph start/end
     56  *  and emits balanced tags with a small amount of peephole optimization.
     57  */
     58 
     59 class html_text {
     60 public:
     61          html_text         (simple_output *op);
     62         ~html_text         (void);
     63   void   flush_text        (void);
     64   void   do_emittext       (const char *s, int length);
     65   void   do_italic         (void);
     66   void   do_bold           (void);
     67   void   do_roman          (void);
     68   void   do_tt             (void);
     69   void   do_pre            (void);
     70   void   do_small          (void);
     71   void   do_big            (void);
     72   void   do_para           (const char *arg, int space); // used for no indentation
     73   void   do_para           (simple_output *op, const char *arg1,
     74 			    int indentation, int pageoffset, int linelength,
     75                             int space);
     76   void   do_sup            (void);
     77   void   do_sub            (void);
     78   void   do_space          (void);
     79   void   do_break          (void);
     80   void   do_newline        (void);
     81   void   do_table          (const char *arg);
     82   void   done_bold         (void);
     83   void   done_italic       (void);
     84   char  *done_para         (void);
     85   void   done_sup          (void);
     86   void   done_sub          (void);
     87   void   done_tt           (void);
     88   void   done_pre          (void);
     89   void   done_small        (void);
     90   void   done_big          (void);
     91   void   do_color          (color *c);
     92   void   done_color        (void);
     93   int    emitted_text      (void);
     94   int    ever_emitted_text (void);
     95   int    starts_with_space (void);
     96   int    retrieve_para_space (void);
     97   void   emit_space        (void);
     98   int    is_in_pre         (void);
     99   int    uses_indent       (void);
    100   void   remove_tag        (HTML_TAG tag);
    101   void   remove_sub_sup    (void);
    102   void   remove_para_align (void);
    103   void   remove_para_space (void);
    104   char  *get_alignment     (void);
    105 
    106 private:
    107   tag_definition   *stackptr;    /* the current paragraph state */
    108   tag_definition   *lastptr;     /* the end of the stack        */
    109   simple_output    *out;
    110   int               space_emitted;   /* just emitted a space?   */
    111   int               current_indentation;   /* current .in value */
    112   int               pageoffset;            /* .po value         */
    113   int               linelength;          /* current line length */
    114   int               blank_para;   /* have we ever written text? */
    115   int               start_space;  /* does para start with a .sp */
    116   html_indent      *indent;                 /* our indent class */
    117 
    118   int    is_present          (HTML_TAG t);
    119   void   end_tag             (tag_definition *t);
    120   void   start_tag           (tag_definition *t);
    121   void   do_para             (const char *arg, html_indent *in, int space);
    122   void   push_para           (HTML_TAG t);
    123   void   push_para           (HTML_TAG t, void *arg, html_indent *in);
    124   void   push_para           (color *c);
    125   void   do_push             (tag_definition *p);
    126   char  *shutdown            (HTML_TAG t);
    127   void   check_emit_text     (tag_definition *t);
    128   int    remove_break        (void);
    129   void   issue_tag           (const char *tagname, const char *arg, int space=2);
    130   void   issue_color_begin   (color *c);
    131   void   remove_def          (tag_definition *t);
    132   html_indent *remove_indent (HTML_TAG tag);
    133   void   dump_stack_element  (tag_definition *p);
    134   void   dump_stack          (void);
    135 };
    136