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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 library trydart.htmlToText; | |
| 6 | |
| 7 import 'dart:math' show | |
| 8 max; | |
| 9 | |
| 10 import 'dart:html' show | |
| 11 CharacterData, | |
| 12 Element, | |
| 13 Node, | |
| 14 NodeFilter, | |
| 15 ShadowRoot, | |
| 16 TreeWalker; | |
| 17 | |
| 18 import 'selection.dart' show | |
| 19 TrySelection; | |
| 20 | |
| 21 import 'shadow_root.dart' show | |
| 22 WALKER_NEXT, | |
| 23 WALKER_SKIP_NODE, | |
| 24 walkNodes; | |
| 25 | |
| 26 /// Returns true if [node] is a block element, that is, not inline. | |
| 27 bool isBlockElement(Node node) { | |
| 28 if (node is! Element) return false; | |
| 29 Element element = node; | |
| 30 | |
| 31 // TODO(ahe): Remove this line by changing code completion to avoid using a | |
| 32 // div element. | |
| 33 if (element.classes.contains('dart-code-completion')) return false; | |
| 34 | |
| 35 var display = element.getComputedStyle().display; | |
| 36 return display != 'inline' && display != 'none'; | |
| 37 } | |
| 38 | |
| 39 /// Writes the text of [root] to [buffer]. Keeps track of [selection] and | |
| 40 /// returns the new anchorOffset from beginning of [buffer] or -1 if the | |
| 41 /// selection isn't in [root]. | |
| 42 int htmlToText(Node root, | |
| 43 StringBuffer buffer, | |
| 44 TrySelection selection, | |
| 45 {bool treatRootAsInline: false}) { | |
| 46 int selectionOffset = -1; | |
| 47 walkNodes(root, (Node node) { | |
| 48 if (selection.anchorNode == node) { | |
| 49 selectionOffset = selection.anchorOffset + buffer.length; | |
| 50 } | |
| 51 switch (node.nodeType) { | |
| 52 case Node.CDATA_SECTION_NODE: | |
| 53 case Node.TEXT_NODE: | |
| 54 CharacterData text = node; | |
| 55 buffer.write(text.data.replaceAll('\xA0', ' ')); | |
| 56 break; | |
| 57 | |
| 58 default: | |
| 59 if (node.nodeName == 'BR') { | |
| 60 buffer.write('\n'); | |
| 61 } else if (node != root && isBlockElement(node)) { | |
| 62 selectionOffset = | |
| 63 max(selectionOffset, htmlToText(node, buffer, selection)); | |
| 64 return WALKER_SKIP_NODE; | |
| 65 } | |
| 66 break; | |
| 67 } | |
| 68 | |
| 69 return WALKER_NEXT; | |
| 70 }); | |
| 71 | |
| 72 if (!treatRootAsInline && isBlockElement(root)) { | |
| 73 buffer.write('\n'); | |
| 74 } | |
| 75 | |
| 76 return selectionOffset; | |
| 77 } | |
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