libvaladoc/markupwriter.vala

   1 /* markupwriter.vala
   2  *
   3  * Copyright (C) 2008-2009 Florian Brosch, Didier Villevalois
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Didier 'Ptitjes Villevalois <ptitjes@free.fr>
  21  */
  22
  23
  24 /**
  25  * Writes markups and text to a file.
  26  */
  27 public class Valadoc.MarkupWriter {
  28         protected WriteFunc write;
  29         protected int indent;
  30
  31         protected long current_column = 0;
  32         protected bool last_was_tag;
  33         private bool wrap = true;
  34
  35         public static string escape (string txt) {
  36                 StringBuilder builder = new StringBuilder ();
  37                 unowned string start = txt;
  38                 unowned string pos;
  39                 unichar c;
  40
  41                 for (pos = txt; (c = pos.get_char ()) != '\0'; pos = pos.next_char ()) {
  42                         switch (c) {
  43                         case '"':
  44                                 builder.append_len (start, (ssize_t) ((char*) pos - (char*) start));
  45                                 builder.append ("&quot;");
  46                                 start = pos.next_char ();
  47                                 break;
  48
  49                         case '<':
  50                                 builder.append_len (start, (ssize_t) ((char*) pos - (char*) start));
  51                                 builder.append ("&lt;");
  52                                 start = pos.next_char ();
  53                                 break;
  54
  55                         case '>':
  56                                 builder.append_len (start, (ssize_t) ((char*) pos - (char*) start));
  57                                 builder.append ("&gt;");
  58                                 start = pos.next_char ();
  59                                 break;
  60
  61                         case '&':
  62                                 builder.append_len (start, (ssize_t) ((char*) pos - (char*) start));
  63                                 builder.append ("&amp;");
  64                                 start = pos.next_char ();
  65                                 break;
  66
  67                         case '\'':
  68                                 builder.append_len (start, (ssize_t) ((char*) pos - (char*) start));
  69                                 builder.append ("&apos;");
  70                                 start = pos.next_char ();
  71                                 break;
  72                         }
  73                 }
  74
  75                 if (&txt == &start) {
  76                         return txt;
  77                 } else {
  78                         builder.append_len (start, (ssize_t) ((char*) pos - (char*) start));
  79                         return (owned) builder.str;
  80                 }
  81         }
  82
  83         /**
  84          * Writes text to a desination like a {@link GLib.StringBuilder} or a {@link GLib.FileStream}
  85          */
  86         public delegate void WriteFunc (string text);
  87
  88         private const int MAX_COLUMN = 150;
  89
  90         /**
  91          * Initializes a new instance of the MarkupWriter
  92          *
  93          * @param write stream a WriteFunc
  94          * @param xml_declaration specifies whether this file starts with an xml-declaration
  95          */
  96         public MarkupWriter (owned WriteFunc write, bool xml_declaration = true) {
  97                 this.write = (owned) write;
  98                 if (xml_declaration) {
  99                         do_write ("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
 100                 }
 101                 indent = -1;
 102                 last_was_tag = true;
 103         }
 104
 105         /**
 106          * Writes an start tag of a markup element to the file
 107          *
 108          * @param name the name of the markup
 109          * @param attributes a list of name/value pairs
 110          * @return this
 111          */
 112         public MarkupWriter start_tag (string name, string[]? attributes=null) {
 113                 indent++;
 114                 check_column (name);
 115
 116                 if (attributes.length % 2 != 0) {
 117                         attributes.resize (attributes.length+1);
 118                         attributes[attributes.length-1] = "";
 119                 }
 120
 121                 var content = new StringBuilder ("<");
 122                 content.append (name);
 123                 for (int i = 0; i < attributes.length; i=i+2) {
 124                         if (attributes[i+1] != null) {
 125                                 content.append_printf (" %s=\"%s\"", attributes[i], attributes[i+1]);
 126                         }
 127                 }
 128                 content.append (">");
 129
 130                 do_write (content.str);
 131                 last_was_tag = true;
 132                 return this;
 133         }
 134
 135         /**
 136          * Writes a simple tag (<name />) to the file
 137          *
 138          * @param name the name of the markup
 139          * @param attributes a list of name/value pairs
 140          * @return this
 141          */
 142         public MarkupWriter simple_tag (string name, string[]? attributes=null) {
 143                 indent++;
 144                 check_column (name);
 145
 146                 if (attributes.length % 2 != 0) {
 147                         attributes.resize (attributes.length+1);
 148                         attributes[attributes.length-1] = "";
 149                 }
 150
 151                 var content = new StringBuilder ("<");
 152                 content.append (name);
 153                 for (int i = 0; i < attributes.length; i=i+2) {
 154                         if (attributes[i+1] != null) {
 155                                 content.append_printf (" %s=\"%s\"", attributes[i], attributes[i+1]);
 156                         }
 157                 }
 158                 content.append ("/>");
 159
 160                 do_write (content.str);
 161                 indent--;
 162                 last_was_tag = true;
 163                 return this;
 164         }
 165
 166         /**
 167          * Writes an end tag of a markup element to the file
 168          *
 169          * @param name the name of the markup
 170          * @return this
 171          */
 172         public MarkupWriter end_tag (string name) {
 173                 check_column (name, true);
 174                 do_write ("</%s>".printf (name));
 175                 indent--;
 176                 last_was_tag = true;
 177                 return this;
 178         }
 179
 180         /**
 181          * Writes the specified string to the output stream
 182          *
 183          * @see raw_text
 184          * @return this
 185          */
 186         public MarkupWriter text (string text) {
 187                 if (wrap && text.length + current_column > MAX_COLUMN) {
 188                         long wrote = 0;
 189                         while (wrote < text.length) {
 190                                 long space_pos = -1;
 191                                 for (long i = wrote + 1; i < text.length; i++) {
 192                                         if (text[i] == ' ') {
 193                                                 if (i - wrote + current_column > MAX_COLUMN) {
 194                                                         break;
 195                                                 }
 196                                                 space_pos = i;
 197                                         }
 198                                 }
 199                                 if (text.length - wrote + current_column <= MAX_COLUMN) {
 200                                         do_write (text.substring (wrote));
 201                                         wrote = text.length + 1;
 202                                 } else if (space_pos == -1) {
 203                                         // Force line break
 204                                 } else {
 205                                         do_write (text.substring (wrote, space_pos - wrote));
 206                                         wrote = space_pos + 1;
 207                                 }
 208                                 if (wrote < text.length) {
 209                                         break_line ();
 210                                         do_write ("  ");
 211                                 }
 212                         }
 213                 } else {
 214                         do_write (text);
 215                 }
 216                 last_was_tag = false;
 217                 return this;
 218         }
 219
 220         /**
 221          * Writes the specified string to the output stream
 222          *
 223          * @see text
 224          * @return this
 225          */
 226         public MarkupWriter raw_text (string text) {
 227                 do_write (text);
 228                 last_was_tag = false;
 229                 return this;
 230         }
 231
 232         public void set_wrap (bool wrap) {
 233                 this.wrap = wrap;
 234         }
 235
 236         private void break_line () {
 237                 write ("\n");
 238                 write (string.nfill (indent * 2, ' '));
 239                 current_column = indent * 2;
 240         }
 241
 242         protected void do_write (string text) {
 243                 if (wrap && current_column + text.length > MAX_COLUMN) {
 244                         break_line ();
 245                 }
 246                 write (text);
 247                 current_column += text.length;
 248         }
 249
 250         private void check_column (string name, bool end_tag = false) {
 251                 if (!wrap) {
 252                         return;
 253                 } else if (!end_tag && inline_element (name) /*&& !last_was_tag*/) {
 254                         return;
 255                 } else if (end_tag && content_inline_element (name)) {
 256                         return;
 257                 } else if (end_tag && !last_was_tag) {
 258                         return;
 259                 }
 260                 break_line ();
 261         }
 262
 263         protected virtual bool inline_element (string name) {
 264                 return false;
 265         }
 266
 267         protected virtual bool content_inline_element (string name) {
 268                 return true;
 269         }
 270 }
 271
 272