xmllist.java

這是一個javascript 的 interpreter是了解 web browser的好材料

/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1999.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Ethan Hugg
 *   Terry Lucas
 *   Milen Nankov
 *   David P. Caldwell <[e-mail]>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.javascript.xmlimpl;

import org.mozilla.javascript.*;
import org.mozilla.javascript.xml.*;

class XMLList extends XMLObjectImpl implements Function {
    static final long serialVersionUID = -4543618751670781135L;

    private XmlNode.List _annos;
    private XMLObjectImpl targetObject = null;
    private XmlNode.QName targetProperty = null;

    XMLList(XMLLibImpl lib, Scriptable scope, XMLObject prototype) {
        super(lib, scope, prototype);
        _annos = new XmlNode.List();
    }

    /** @deprecated Will probably end up unnecessary as we move things around */
    XmlNode.List getNodeList() {
        return _annos;
    }

    //    TODO    Should be XMLObjectImpl, XMLName?
    void setTargets(XMLObjectImpl object, XmlNode.QName property) {
        targetObject = object;
        targetProperty = property;
    }

    /** @deprecated */
    private XML getXmlFromAnnotation(int index) {
        return getXML(_annos, index);
    }

    XML getXML() {
        if (length() == 1) return getXmlFromAnnotation(0);
        return null;
    }

    private void internalRemoveFromList(int index) {
        _annos.remove(index);
    }

    void replace(int index, XML xml) {
        if (index < length()) {
            XmlNode.List newAnnoList = new XmlNode.List();
            newAnnoList.add(_annos, 0, index);
            newAnnoList.add(xml);
            newAnnoList.add(_annos, index+1, length());
            _annos = newAnnoList;
        }
    }

    private void insert(int index, XML xml) {
        if (index < length()) {
            XmlNode.List newAnnoList = new XmlNode.List();
            newAnnoList.add(_annos, 0, index);
            newAnnoList.add(xml);
            newAnnoList.add(_annos, index, length());
            _annos = newAnnoList;
        }
    }

    //
    //
    //  methods overriding ScriptableObject
    //
    //

    public String getClassName() {
        return "XMLList";
    }

    //
    //
    //  methods overriding IdScriptableObject
    //
    //

    public Object get(int index, Scriptable start) {
        //Log("get index: " + index);

        if (index >= 0 && index < length()) {
            return getXmlFromAnnotation(index);
        } else {
            return Scriptable.NOT_FOUND;
        }
    }

    boolean hasXMLProperty(XMLName xmlName) {
        boolean result = false;

        // Has now should return true if the property would have results > 0 or
        // if it's a method name
        String name = xmlName.localName();
        if ((getPropertyList(xmlName).length() > 0) ||
            (getMethod(name) != NOT_FOUND)) {
            result = true;
        }

        return result;
    }

    public boolean has(int index, Scriptable start) {
        return 0 <= index && index < length();
    }

    void putXMLProperty(XMLName xmlName, Object value) {
        //Log("put property: " + name);

        // Special-case checks for undefined and null
        if (value == null) {
            value = "null";
        } else if (value instanceof Undefined) {
            value = "undefined";
        }

        if (length() > 1) {
            throw ScriptRuntime.typeError("Assignment to lists with more than one item is not supported");
        } else if (length() == 0) {
            // Secret sauce for super-expandos.
            // We set an element here, and then add ourselves to our target.
            if (targetObject != null && targetProperty != null && targetProperty.getLocalName() != null) {
                // Add an empty element with our targetProperty name and then set it.
                XML xmlValue = newTextElementXML(null, targetProperty, null);
                addToList(xmlValue);

                if(xmlName.isAttributeName()) {
                    setAttribute(xmlName, value);
                } else {
                    XML xml = item(0);
                    xml.putXMLProperty(xmlName, value);

                    // Update the list with the new item at location 0.
                    replace(0, item(0));
                }

                // Now add us to our parent
                XMLName name2 = XMLName.formProperty(targetProperty.getUri(), targetProperty.getLocalName());
                targetObject.putXMLProperty(name2, this);
            } else {
                throw ScriptRuntime.typeError("Assignment to empty XMLList without targets not supported");
            }
        } else if(xmlName.isAttributeName()) {
            setAttribute(xmlName, value);
        } else {
            XML xml = item(0);
            xml.putXMLProperty(xmlName, value);

            // Update the list with the new item at location 0.
            replace(0, item(0));
        }
    }

    Object getXMLProperty(XMLName name) {
        return getPropertyList(name);
    }

    private void replaceNode(XML xml, XML with) {
        xml.replaceWith(with);
    }

    public void put(int index, Scriptable start, Object value) {
        Object parent = Undefined.instance;
        // Convert text into XML if needed.
        XMLObject xmlValue;

        // Special-case checks for undefined and null
        if (value == null) {
            value = "null";
        } else if (value instanceof Undefined) {
            value = "undefined";
        }

        if (value instanceof XMLObject) {
            xmlValue = (XMLObject) value;
        } else {
            if (targetProperty == null) {
                xmlValue = newXMLFromJs(value.toString());
            } else {
                //    Note that later in the code, we will use this as an argument to replace(int,value)
                //    So we will be "replacing" this element with itself
                //    There may well be a better way to do this
                //    TODO    Find a way to refactor this whole method and simplify it
                xmlValue = item(index);
                ((XML)xmlValue).setChildren(value);
            }
        }

        // Find the parent
        if (index < length()) {
            parent = item(index).parent();
        } else {
            // Appending
            parent = parent();
        }

        if (parent instanceof XML) {
            // found parent, alter doc
            XML xmlParent = (XML) parent;

            if (index < length()) {
                // We're replacing the the node.
                XML xmlNode = getXmlFromAnnotation(index);

                if (xmlValue instanceof XML) {
                    replaceNode(xmlNode, (XML) xmlValue);
                    replace(index, xmlNode);
                } else if (xmlValue instanceof XMLList) {
                    // Replace the first one, and add the rest on the list.
                    XMLList list = (XMLList) xmlValue;

                    if (list.length() > 0) {
                        int lastIndexAdded = xmlNode.childIndex();
                        replaceNode(xmlNode, list.item(0));
                        replace(index, list.item(0));

                        for (int i = 1; i < list.length(); i++) {
                            xmlParent.insertChildAfter(xmlParent.getXmlChild(lastIndexAdded), list.item(i));
                            lastIndexAdded++;
                            insert(index + i, list.item(i));
                        }
                    }
                }
            } else {
                // Appending
                xmlParent.appendChild(xmlValue);
                addToList(xmlParent.getXmlChild(index));
            }
        } else {
            // Don't all have same parent, no underlying doc to alter
            if (index < length()) {
                XML xmlNode = getXML(_annos, index);

                if (xmlValue instanceof XML) {
                    replaceNode(xmlNode, (XML) xmlValue);
                    replace(index, xmlNode);
                } else if (xmlValue instanceof XMLList) {
                    // Replace the first one, and add the rest on the list.
                    XMLList list = (XMLList) xmlValue;

                    if (list.length() > 0) {
                        replaceNode(xmlNode, list.item(0));
                        replace(index, list.item(0));

                        for (int i = 1; i < list.length(); i++) {
                            insert(index + i, list.item(i));
                        }
                    }
                }
            } else {
                addToList(xmlValue);
            }
        }
    }

    private XML getXML(XmlNode.List _annos, int index) {
        if (index >= 0 && index < length()) {
            return xmlFromNode(_annos.item(index));
        } else {
            return null;
        }
    }

    void deleteXMLProperty(XMLName name) {
        for (int i = 0; i < length(); i++) {
            XML xml = getXmlFromAnnotation(i);

            if (xml.isElement()) {
                xml.deleteXMLProperty(name);
            }
        }
    }

    public void delete(int index) {
        if (index >= 0 && index < length()) {
            XML xml = getXmlFromAnnotation(index);

            xml.remove();

            internalRemoveFromList(index);
        }
    }

    public Object[] getIds() {
        Object enumObjs[];

        if (isPrototype()) {
            enumObjs = new Object[0];
        } else {
            enumObjs = new Object[length()];

            for (int i = 0; i < enumObjs.length; i++) {
                enumObjs[i] = new Integer(i);
            }
        }

        return enumObjs;
    }

    public Object[] getIdsForDebug() {
        return getIds();
    }


    // XMLList will remove will delete all items in the list (a set delete) this differs from the XMLList delete operator.
    void remove() {
        int nLen = length();
        for (int i = nLen - 1; i >= 0; i--) {
            XML xml = getXmlFromAnnotation(i);
            if (xml != null) {
                xml.remove();
                internalRemoveFromList(i);
            }
        }
    }

    XML item(int index) {
        return _annos != null
            ? getXmlFromAnnotation(index) : createEmptyXML();
    }

    private void setAttribute(XMLName xmlName, Object value) {
        for (int i = 0; i < length(); i++) {
            XML xml = getXmlFromAnnotation(i);
            xml.setAttribute(xmlName, value);
        }
    }

    void addToList(Object toAdd) {
        _annos.addToList(toAdd);
    }

    //
    //
    // Methods from section 12.4.4 in the spec
    //
    //

    XMLList child(int index) {
        XMLList result = newXMLList();

        for (int i = 0; i < length(); i++) {