1 | /*
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2 | * file: RemoveTextAction.js
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3 | *
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4 | * @BEGINLICENSE
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5 | * Copyright 2010 Brook Novak (email : [email protected])
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | * You should have received a copy of the GNU General Public License
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15 | * along with this program; if not, write to the Free Software
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16 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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17 | * @ENDLICENSE
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18 | */
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19 |
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20 | // @DEPENDS: UndoMan
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21 | bootstrap.provides("actions.RemoveTextAction");
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22 |
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23 | _registerAction("RemoveText", {
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24 |
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25 | /**
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26 | * Removes text within a single text node.
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27 | *
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28 | * @param {Node} textNode The text node to remove text from
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29 | *
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30 | * @param {Number} index The index at which to begin removing text from.
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31 | * Ranges from 0 - textlength - 1
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32 | *
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33 | * @param {Number} length The amount of charactors to remove start from the given index. Must be at least 1
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34 | */
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35 | exec : function(textNode, index, length) {
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36 |
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37 | debug.assert(index >= 0);
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38 | debug.assert(length > 0);
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39 | debug.assert(textNode.nodeType == Node.TEXT_NODE);
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40 | debug.assert((index + length) <= textNode.nodeValue.length);
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41 |
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42 | // Avoid removing text from placeholders
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43 | if (de.doc.isESPlaceHolder(textNode, false) || de.doc.isMNPlaceHolder(textNode, false)) {
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44 | // Keep current cursor position
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45 | if (this.flags & de.UndoMan.ExecFlag.UPDATE_SELECTION) {
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46 | var cDesc = de.cursor.getCurrentCursorDesc();
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47 | if (cDesc)
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48 | this.selAfter = {startNode : cDesc.domNode, startIndex : cDesc.relIndex + (cDesc.domNode.nodeType == Node.TEXT_NODE && cDesc.isRightOf ? 1 : 0)};
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49 | }
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50 | return;
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51 | }
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52 |
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53 |
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54 | // Check for surrounding whitespace
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55 | var convertLeftCA, convertRightCA;
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56 | if (index == 0) {
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57 |
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58 | // Look for preceeding whitespace
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59 | _visitAllNodes(docBody, textNode, false, function(domNode) {
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60 |
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61 | if (domNode == textNode) return;
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62 |
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63 | var ca = _getCommonAncestor(textNode, domNode);
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64 |
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65 | if (_findAncestor(domNode, ca, _isBlockLevel, true))
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66 | return false;
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67 |
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68 | if (domNode.nodeType == Node.TEXT_NODE && _nodeLength(domNode) > 0) {
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69 | if (_isAllWhiteSpace(domNode.nodeValue.charAt(_nodeLength(domNode)-1))) {
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70 | convertLeftCA = ca;
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71 | return false;
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72 | }
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73 | }
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74 | });
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75 |
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76 | } else {
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77 | if(_isAllWhiteSpace(textNode.nodeValue.charAt(index-1)))
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78 | convertLeftCA = textNode;
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79 | }
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80 |
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81 | if ((index + length) == _nodeLength(textNode)) {
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82 |
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83 | // Look for proceeding whitespace
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84 | _visitAllNodes(docBody, textNode, true, function(domNode) {
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85 |
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86 | if (domNode == textNode) return;
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87 |
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88 | var ca = _getCommonAncestor(textNode, domNode);
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89 |
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90 | if (_isBlockLevel(domNode) || _findAncestor(textNode, ca, _isBlockLevel, true))
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91 | return false;
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92 |
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93 | if (_nodeLength(domNode, 0) > 0) {
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94 | if (_isAllWhiteSpace(domNode.nodeValue.charAt(0))) {
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95 | convertRightCA = ca;
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96 | return false;
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97 | }
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98 | }
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99 | });
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100 | } else {
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101 | if (_isAllWhiteSpace(textNode.nodeValue.charAt(index + length)))
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102 | convertRightCA = textNode;
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103 | }
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104 |
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105 | var convertTarget = (convertLeftCA && convertRightCA && convertLeftCA != convertRightCA) ?
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106 | _getCommonAncestor(convertLeftCA, convertRightCA, true) : convertLeftCA || convertRightCA;
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107 |
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108 | if (convertTarget)
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109 | _convertWSToNBSP(convertTarget);
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110 |
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111 | // Remove the text
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112 | _execOp(_Operation.REMOVE_TEXT, textNode, index, length);
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113 |
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114 | // Normalize converted white space
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115 | if (convertTarget)
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116 | _normalizeNBSP(convertTarget);
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117 |
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118 | // See if need to add a placeholder
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119 | var ph, phParent = de.doc.getEditSectionContainer(textNode);
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120 |
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121 | if (phParent && _doesNeedESPlaceholder(phParent))
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122 | ph = de.doc.createESPlaceholder(phParent);
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123 | else {
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124 | phParent = _findAncestor(textNode, docBody, _isBlockLevel, true) || docBody;
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125 | if (_doesNeedMNPlaceholder(phParent))
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126 | ph = de.doc.createMNPlaceholder();
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127 | }
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128 |
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129 | // Add the needed placeholder
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130 | if (ph)
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131 | _execOp(_Operation.INSERT_NODE, ph, phParent);
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132 |
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133 | // Update the selection if requested
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134 | if (this.flags & de.UndoMan.ExecFlag.UPDATE_SELECTION) {
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135 | var cDesc = ph ? de.cursor.createCursorDesc(ph, 0, false) :
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136 | de.cursor.getNearestCursorDesc(textNode, index == 0 ? 0 : index-1, index > 0, false);
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137 | if (cDesc)
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138 | this.selAfter = {startNode : cDesc.domNode, startIndex : cDesc.relIndex + (cDesc.domNode.nodeType == Node.TEXT_NODE && cDesc.isRightOf ? 1 : 0)};
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139 | }
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140 |
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141 | // If the text node is left without text then get rid of it
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142 | if (_nodeLength(textNode) == 0)
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143 | _execOp(_Operation.REMOVE_NODE, textNode);
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144 |
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145 | }
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146 | });
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147 |
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148 |
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