Implement a part of ProcessingInstruction by using PrivateScript

Source/core/dom/ProcessingInstruction.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+"use strict";
+
+installClass("ProcessingInstruction", function(ProcessingInstructionPrototype) {
+
+    // Should be implemented as HTMLSerializer / XMLSerializer.
+    function serializeAttributes(node) {
+        var attributes = node.attributes;
+        if (!attributes)
+            return '';
+        var sink = '';
+        var attrs = [];
+        for (var index = 0; index < attributes.length; ++index) {
+            attrs.push(attributes[index]);
+        }
+
+        attrs.sort(function(a, b) {
+            return a.name <= b.name ? -1 : 0;
+        }).forEach(function(attr) {
+            var attrName = attr.name;
+            if (attrName.indexOf('_moz') == 0)
+                return;
+            var attrValue = attr.value;
+            if (attrValue){
+                attrValue = String(attrValue).replace(/&/g, '&amp;')
+                    .replace(/\u0022/g, '&quot;')
+                sink += ' ' + attrName + '="' + attrValue + '"';
+            } else {
+                sink += ' ' + attrName;
+            }
+        });
+        return sink;
+    }
+
+    function serializeChildren(node, isXML) {
+        var sink = '';
+        var child = node.firstChild;
+        while (child) {
+            sink += serialize(child, isXML);
+            var nextSibling = child.nextSibling;
+            if (child.nodeType == Node.TEXT_NODE && nextSibling &&
+                nextSibling.nodeType == Node.TEXT_NODE) {
+                sink += '_';
+            }
+            child = nextSibling;
+        }
+        return sink;
+    }
+
+    var _END_TAG_MISSIBLE = {'area':true,'base':true,'br':true,'col':true,'command':true,'embed':true,'frame':true,
+                             'hr':true,'img':true,'input':true,'keygen':true,'link':true,'meta':true,'param':true,
+                             'source':true,'track':true,'wbr':true};
+
+    // FIXME: should implement this as HTMLSerializer to share the code with editing?
+    function serialize(node, isXML) {
+        if (node.nodeType == Node.TEXT_NODE) {
+            if (node.parentNode && node.parentNode.nodeType == Node.ELEMENT_NODE && node.parentNode.nodeName.toLowerCase() == 'script')
+                return node.nodeValue;
+            // Need to escape: &amp;, &lt;
+            return node.nodeValue.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+        }
+        if (node.nodeType == Node.DOCUMENT_TYPE_NODE) {
+            var sink = '<!DOCTYPE ' + node.name;
+            if (node.publicId) {
+                sink += ' PUBLIC "' + node.publicId + '"';
+                if (node.systemId)
+                    sink += ' "' + node.systemId + '"';
+            }
+            sink += '>';
+            return sink;
+        }
+        if (node.nodeType == Node.PROCESSING_INSTRUCTION_NODE) {
+            var sink = '<?' + node.target;
+            if (node.nodeValue)
+                sink += ' ' + node.nodeValue;
+            sink += '?>';
+            return sink;
+        }
+        if (node.nodeType == Node.COMMENT_NODE) {
+            return '<!-- ' + node.nodeValue + ' -->';
+        }
+        if (node.nodeType != Node.ELEMENT_NODE) {
+            // To support |Document| node, we iterate over child nodes.
+            var sink = '';
+            for (var child = node.firstChild; child; child = child.nextSibling) {
+                sink += serialize(child, isXML);
+            }
+            return sink.length ? sink : node.nodeValue;
+        }
+
+        var tagName = node.nodeName.toLowerCase();
+        var sink = '<' + node.nodeName + serializeAttributes(node) + '>';
+
+        if (tagName == 'template') {
+            sink += serializeChildren(node.content, node.content instanceof XMLDocument);
+        } else if (tagName == 'iframe') {
+            sink += serialize(node.contentDocument, node.contentDocument instanceof XMLDocument);
+        } else {
+            sink += serializeChildren(node, isXML);
+        }
+
+        if (!_END_TAG_MISSIBLE[tagName] || isXML)
+            sink += '</' + node.nodeName + '>';
+        return sink;
+    }
+
+    function applyXSLTransformToCurrentDocument(pi) {
+        var processor = new XSLTProcessor;
+        processor.importStylesheet(pi.styleSheetRootNode_);
+        var transformedDocument = processor.transformToDocument(window.document);
+        if (!transformedDocument)
+            return;
+        var content = serialize(transformedDocument, transformedDocument instanceof XMLDocument);
+        window.replaceDocument(content, transformedDocument.contentType, transformedDocument.characterSet);
+    }
+
+    function findFirstStyleSheet() {
+        for (var child = document.firstChild; child; child = child.nextSibling) {
+            if (child.nodeName == 'xml-stylesheet')
+                return child.styleSheetRootNode_ ? child : null;
+        }
+        return null;
+    }
+
+    function initializeForXSLT(parsing) {
+        window.document.parsing_ = parsing;
+        window.document.addEventListener('DOMContentLoaded', function() {
+            window.document.parsing_ = false;
+            if (window.document.transformSourceDocument_)
+                return;
+            var pi = findFirstStyleSheet();
+            if (!pi)
+                return;
+            applyXSLTransformToCurrentDocument(pi);
+        }, false);
+    }
+
+    ProcessingInstructionPrototype.onProcessingInstructionAvailable = function(href, parsing) {
+        if (!window.document.xslStyleSheetInitialized_)
+            initializeForXSLT(parsing);
+
+        var request = new XMLHttpRequest();
+        request.pi_ = this;
+        request.onload = function() {
+            var xmldoc = request.responseXML;
+            if (!xmldoc)
+                xmldoc = new DOMParser().parseFromString(request.responseText, 'text/xml');
+            var regex = new RegExp('#[^/#?]+$');
+            var match = regex.exec(href);
+            if (match && xmldoc) {
+                this.pi_.styleSheetRootNode_ = xmldoc.getElementById(match[0].substring(1));
+            } else {
+                this.pi_.styleSheetRootNode_ = xmldoc;
+            }
+            if (window.document.transformSourceDocument_ || window.document.parsing_)
+                return;
+            if (findFirstStyleSheet() == this.pi_)
+                applyXSLTransformToCurrentDocument(this.pi_);
+        };
+        request.open("GET", href, true);
+        request.send();
+    }
+});
+