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| 1 | wakaba | 1.1 | /* xpointer.js - XPointer implementation written in JavaScript */ |
| 2 | |||
| 3 | |||
| 4 | /* Regular Expressions */ | ||
| 5 | /* BUG: These expressions are less strict than the formal definition of XPointer */ | ||
| 6 | var ncname = '[A-Za-z_\u00C0-\u02FF\u0370-\u203E\u2041-\uFFFD]' + | ||
| 7 | '[A-Za-z_\u00C0-\uFFFD.0-9\u00B7-]*'; | ||
| 8 | var isNCName = new RegExp ('^' + ncname + '$'); | ||
| 9 | var pointerPart = new RegExp ('^(' + ncname + ')(?:' + ':(' + ncname + '))?' + | ||
| 10 | '\\(' + '(' + '[^()^]*(?:[^()^]|\\^[()^]' + | ||
| 11 | '|\\([^()^]*(?:[^()^]|\\^[()^]' + | ||
| 12 | '|\\([^()^]*(?:[^()^]|\\^[()^]' + | ||
| 13 | '|\\([^()^]*(?:[^()^]|\\^[()^]' + | ||
| 14 | // | ||
| 15 | ')*\\)' + | ||
| 16 | ')*\\)' + | ||
| 17 | ')*\\)' + | ||
| 18 | ')*' + ')' + '\\)' + | ||
| 19 | '[\x09\x0A\x0D\x20]*'); | ||
| 20 | |||
| 21 | /** Implemenetations of XPointer schemes */ | ||
| 22 | function XPointerSchemeProcessor (evaluateFunction) { | ||
| 23 | this.evaluate = evaluateFunction; | ||
| 24 | } | ||
| 25 | |||
| 26 | /** XPointer Evaluation Engine */ | ||
| 27 | function XPointerEvaluator () { | ||
| 28 | return this; | ||
| 29 | } | ||
| 30 | |||
| 31 | /** Evaluates an XPointer pointer in the context of a document. | ||
| 32 | |||
| 33 | @param aDocument A document in which the pointer is evaluated. | ||
| 34 | @param aExpression An XPointer pointer. | ||
| 35 | @raise XPointerShorthandNoMatchError | ||
| 36 | A shorthand pointer is specified but it does not | ||
| 37 | identify any element. | ||
| 38 | @raise XPointerSchemeBasedNoMatchError | ||
| 39 | A scheme-based pointer is specified but it does not | ||
| 40 | identify any subresources. | ||
| 41 | @raise XPointerSyntaxError | ||
| 42 | An illegal pointer is specified. | ||
| 43 | @return XPointerResult that contains subresources identified by the poitner. | ||
| 44 | */ | ||
| 45 | XPointerEvaluator.prototype.evaluate = function (aDocument, aExpression) { | ||
| 46 | var ptr = aExpression; | ||
| 47 | var aContext = new XPointerSchemeContext (); | ||
| 48 | if (isNCName.test (aExpression)) { | ||
| 49 | var result = this.getXPointerSchemeProcessor (null, null) | ||
| 50 | .evaluate (aDocument, aContext, ptr); | ||
| 51 | if (!result.hasSubresources) { | ||
| 52 | throw new XPointerShorthandNoMatchError (aExpression); | ||
| 53 | } | ||
| 54 | return result; |