xslt.js

ajax patterns 这是关于ajax设计模式方面的原代码

// Copyright 2005 Google Inc.
// All Rights Reserved
//
//
// An XSL-T processor written in JavaScript. The implementation is NOT
// complete; some xsl element are left out.
//
// References:
//
// [XSLT] XSL-T Specification
// <http://www.w3.org/TR/1999/REC-xslt-19991116>.
//
// [ECMA] ECMAScript Language Specification
// <http://www.ecma-international.org/publications/standards/Ecma-262.htm>.
//
// The XSL processor API has one entry point, the function
// xsltProcessContext(). It receives as arguments the starting point in the
// input document as an XPath expression context, the DOM root node of
// the XSL-T stylesheet, and a DOM node that receives the output.
//
// NOTE: Actually, XSL-T processing according to the specification is
// defined as operation on text documents, not as operation on DOM
// trees. So, strictly speaking, this implementation is not an XSL-T
// processor, but the processing engine that needs to be complemented
// by an XML parser and serializer in order to be complete. Those two
// are found in the file xml.js.
//
//
// TODO(mesch): add jsdoc comments. Use more coherent naming. Finish
// remaining XSLT features.
//
//
// Author: Steffen Meschkat <[e-mail]>


// The exported entry point of the XSL-T processor, as explained
// above.
//
// @param xmlDoc The input document root, as DOM node.
// @param template The stylesheet document root, as DOM node.
// @return the processed document, as XML text in a string.

function xsltProcess(xmlDoc, stylesheet) {
  if (xsltdebug) {
    Log.write('XML STYLESHEET:');
    Log.writeXML(xmlText(stylesheet));
    Log.write('XML INPUT:');
    Log.writeXML(xmlText(xmlDoc));
  }

  var output = (new XDocument).createDocumentFragment();
  xsltProcessContext(new ExprContext(xmlDoc), stylesheet, output);

  var ret = xmlText(output);

  if (xsltdebug) {
    Log.write('HTML OUTPUT:');
    Log.writeXML(ret);
  }

  return ret;
}

// The main entry point of the XSL-T processor, as explained above.
//
// @param input The input document root, as XPath ExprContext.
// @param template The stylesheet document root, as DOM node.
// @param the root of the generated output, as DOM node.

function xsltProcessContext(input, template, output) {

  var nodename = template.nodeName.split(/:/);
  if (nodename.length == 1 || nodename[0] != 'xsl') {
    xsltPassThrough(input, template, output);

  } else {
    switch(nodename[1]) {
    case 'apply-imports':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'apply-templates':
      var select = xmlGetAttribute(template, 'select');
      var nodes;
      if (select) {
        nodes = xpathEval(select,input).nodeSetValue();
      } else {
        nodes = input.node.childNodes;
      }

      var sortContext = input.clone(nodes[0], 0, nodes);
      xsltWithParam(sortContext, template);
      xsltSort(sortContext, template);

      var mode = xmlGetAttribute(template, 'mode');
      var top = template.ownerDocument.documentElement;
      for (var i = 0; i < top.childNodes.length; ++i) {
        var c = top.childNodes[i];
        if (c.nodeType == DOM_ELEMENT_NODE &&
            c.nodeName == 'xsl:template' &&
            c.getAttribute('mode') == mode) {
          for (var j = 0; j < sortContext.nodelist.length; ++j) {
            var nj = sortContext.nodelist[j];
            xsltProcessContext(sortContext.clone(nj, j), c, output);
          }
        }
      }
      break;

    case 'attribute':
      var nameexpr = xmlGetAttribute(template, 'name');
      var name = xsltAttributeValue(nameexpr, input);
      var node = output.ownerDocument.createDocumentFragment();
      xsltChildNodes(input, template, node);
      var value = xmlValue(node);
      output.setAttribute(name, value);
      break;

    case 'attribute-set':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'call-template':
      var name = xmlGetAttribute(template, 'name');
      var top = template.ownerDocument.documentElement;

      var paramContext = input.clone();
      xsltWithParam(paramContext, template);

      for (var i = 0; i < top.childNodes.length; ++i) {
        var c = top.childNodes[i];
        if (c.nodeType == DOM_ELEMENT_NODE &&
            c.nodeName == 'xsl:template' &&
            c.getAttribute('name') == name) {
          xsltChildNodes(paramContext, c, output);
          break;
        }
      }
      break;

    case 'choose':
      xsltChoose(input, template, output);
      break;

    case 'comment':
      var node = output.ownerDocument.createDocumentFragment();
      xsltChildNodes(input, template, node);
      var commentData = xmlValue(node);
      var commentNode = output.ownerDocument.createComment(commentData);
      output.appendChild(commentNode);
      break;

    case 'copy':
      if (input.node.nodeType == DOM_ELEMENT_NODE) {
        var node = output.ownerDocument.createElement(input.node.nodeName);
        output.appendChild(node);
        xsltChildNodes(input, template, node);

      } else if (input.node.nodeType == DOM_ATTRIBUTE_NODE) {
        var node = output.ownerDocument.createAttribute(input.node.nodeName);
        node.nodeValue = input.node.nodeValue;
        output.setAttribute(node);
      }
      break;

    case 'copy-of':
      var select = xmlGetAttribute(template, 'select');
      var value = xpathEval(select, input);
      if (value.type == 'node-set') {
        var nodes = value.nodeSetValue();
        for (var i = 0; i < nodes.length; ++i) {
          xsltCopyOf(output, nodes[i]);
        }

      } else {
        var node = output.ownerDocument.createTextNode(value.stringValue());
        output.appendChild(node);
      }
      break;

    case 'decimal-format':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'element':
      var nameexpr = xmlGetAttribute(template, 'name');
      var name = xsltAttributeValue(nameexpr, input);
      var node = output.ownerDocument.createElement(name);
      output.appendChild(node);
      xsltChildNodes(input, template, node);
      break;

    case 'fallback':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'for-each':
      var sortContext = input.clone();
      xsltSort(sortContext, template);
      xsltForEach(sortContext, template, output);
      break;

    case 'if':
      var test = xmlGetAttribute(template, 'test');
      if (xpathEval(test, input).booleanValue()) {
        xsltChildNodes(input, template, output);
      }
      break;

    case 'import':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'include':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'key':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'message':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'namespace-alias':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'number':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'otherwise':
      alert('error if here: ' + nodename[1]);
      break;

    case 'output':
      // Ignored. -- Since we operate on the DOM, and all further use
      // of the output of the XSL transformation is determined by the
      // browser that we run in, this parameter is not applicable to
      // this implementation.
      break;

    case 'preserve-space':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'processing-instruction':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'sort':
      // just ignore -- was handled by xsltSort()
      break;

    case 'strip-space':
      alert('not implemented: ' + nodename[1]);
      break;

    case 'stylesheet':
    case 'transform':
      xsltChildNodes(input, template, output);
      break;

    case 'template':
      var match = xmlGetAttribute(template, 'match');
      if (match && xpathMatch(match, input)) {
        xsltChildNodes(input, template, output);
      }
      break;

    case 'text':
      var text = xmlValue(template);
      var node = output.ownerDocument.createTextNode(text);
      output.appendChild(node);
      break;

    case 'value-of':
      var select = xmlGetAttribute(template, 'select');
      var value = xpathEval(select, input).stringValue();
      var node = output.ownerDocument.createTextNode(value);
      output.appendChild(node);
      break;

    case 'param':
      xsltVariable(input, template, false);
      break;

    case 'variable':
      xsltVariable(input, template, true);
      break;

    case 'when':
      alert('error if here: ' + nodename[1]);
      break;

    case 'with-param':
      alert('error if here: ' + nodename[1]);
      break;

    default:
      alert('error if here: ' + nodename[1]);
      break;
    }
  }
}


// Sets parameters defined by xsl:with-param child nodes of the
// current template node, in the current input context. This happens
// before the operation specified by the current template node is
// executed.

function xsltWithParam(input, template) {
  for (var i = 0; i < template.childNodes.length; ++i) {
    var c = template.childNodes[i];
    if (c.nodeType == DOM_ELEMENT_NODE && c.nodeName == 'xsl:with-param') {
      xsltVariable(input, c, true);