xmlctor.java

java中比较著名的js引擎当属mozilla开源的rhino

/* -*- 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):
 *   Igor Bukanov
 *
 * 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.*;

class XMLCtor extends IdFunctionObject
{
    static final long serialVersionUID = -8708195078359817341L;

    private static final Object XMLCTOR_TAG = new Object();

    private XMLLibImpl lib;

    XMLCtor(XML xml, Object tag, int id, int arity)
    {
        super(xml, tag, id, arity);
        this.lib = xml.lib;
        activatePrototypeMap(MAX_FUNCTION_ID);
    }

    private void writeSetting(Scriptable target)
    {
        for (int i = 1; i <= MAX_INSTANCE_ID; ++i) {
            int id = super.getMaxInstanceId() + i;
            String name = getInstanceIdName(id);
            Object value = getInstanceIdValue(id);
            ScriptableObject.putProperty(target, name, value);
        }
    }

    private void readSettings(Scriptable source)
    {
        for (int i = 1; i <= MAX_INSTANCE_ID; ++i) {
            int id = super.getMaxInstanceId() + i;
            String name = getInstanceIdName(id);
            Object value = ScriptableObject.getProperty(source, name);
            if (value == ScriptableObject.NOT_FOUND) {
                continue;
            }
            switch (i) {
              case Id_ignoreComments:
              case Id_ignoreProcessingInstructions:
              case Id_ignoreWhitespace:
              case Id_prettyPrinting:
                if (!(value instanceof Boolean)) {
                    continue;
                }
                break;
              case Id_prettyIndent:
                if (!(value instanceof Number)) {
                    continue;
                }
                break;
              default:
                throw new IllegalStateException();
            }
            setInstanceIdValue(id, value);
        }
    }

// #string_id_map#

    private static final int
        Id_ignoreComments               = 1,
        Id_ignoreProcessingInstructions = 2,
        Id_ignoreWhitespace             = 3,
        Id_prettyIndent                 = 4,
        Id_prettyPrinting               = 5,

        MAX_INSTANCE_ID                 = 5;

    protected int getMaxInstanceId()
    {
        return super.getMaxInstanceId() + MAX_INSTANCE_ID;
    }

    protected int findInstanceIdInfo(String s) {
        int id;
// #generated# Last update: 2004-07-19 13:03:52 CEST
        L0: { id = 0; String X = null; int c;
            L: switch (s.length()) {
            case 12: X="prettyIndent";id=Id_prettyIndent; break L;
            case 14: c=s.charAt(0);
                if (c=='i') { X="ignoreComments";id=Id_ignoreComments; }
                else if (c=='p') { X="prettyPrinting";id=Id_prettyPrinting; }
                break L;
            case 16: X="ignoreWhitespace";id=Id_ignoreWhitespace; break L;
            case 28: X="ignoreProcessingInstructions";id=Id_ignoreProcessingInstructions; break L;
            }
            if (X!=null && X!=s && !X.equals(s)) id = 0;
        }
// #/generated#

        if (id == 0) return super.findInstanceIdInfo(s);

        int attr;
        switch (id) {
          case Id_ignoreComments:
          case Id_ignoreProcessingInstructions:
          case Id_ignoreWhitespace:
          case Id_prettyIndent:
          case Id_prettyPrinting:
            attr = PERMANENT | DONTENUM;
            break;
          default: throw new IllegalStateException();
        }
        return instanceIdInfo(attr, super.getMaxInstanceId() + id);
    }

// #/string_id_map#

    protected String getInstanceIdName(int id)
    {
        switch (id - super.getMaxInstanceId()) {
          case Id_ignoreComments:               return "ignoreComments";
          case Id_ignoreProcessingInstructions: return "ignoreProcessingInstructions";
          case Id_ignoreWhitespace:             return "ignoreWhitespace";
          case Id_prettyIndent:                 return "prettyIndent";
          case Id_prettyPrinting:               return "prettyPrinting";
        }
        return super.getInstanceIdName(id);
    }

    protected Object getInstanceIdValue(int id)
    {
        switch (id - super.getMaxInstanceId()) {
          case Id_ignoreComments:
            return ScriptRuntime.wrapBoolean(lib.ignoreComments);
          case Id_ignoreProcessingInstructions:
            return ScriptRuntime.wrapBoolean(lib.ignoreProcessingInstructions);
          case Id_ignoreWhitespace:
            return ScriptRuntime.wrapBoolean(lib.ignoreWhitespace);
          case Id_prettyIndent:
            return ScriptRuntime.wrapInt(lib.prettyIndent);
          case Id_prettyPrinting:
            return ScriptRuntime.wrapBoolean(lib.prettyPrinting);
        }
        return super.getInstanceIdValue(id);
    }

    protected void setInstanceIdValue(int id, Object value)
    {
        switch (id - super.getMaxInstanceId()) {
          case Id_ignoreComments:
            lib.ignoreComments = ScriptRuntime.toBoolean(value);
            return;
          case Id_ignoreProcessingInstructions:
            lib.ignoreProcessingInstructions = ScriptRuntime.toBoolean(value);
            return;
          case Id_ignoreWhitespace:
            lib.ignoreWhitespace = ScriptRuntime.toBoolean(value);
            return;
          case Id_prettyIndent:
            lib.prettyIndent = ScriptRuntime.toInt32(value);
            return;
          case Id_prettyPrinting:
            lib.prettyPrinting = ScriptRuntime.toBoolean(value);
            return;
        }
        super.setInstanceIdValue(id, value);
    }

// #string_id_map#
    private static final int
        Id_defaultSettings              = 1,
        Id_settings                     = 2,
        Id_setSettings                  = 3,
        MAX_FUNCTION_ID                 = 3;

    protected int findPrototypeId(String s)
    {
        int id;
// #generated# Last update: 2004-07-19 13:03:52 CEST
        L0: { id = 0; String X = null;
            int s_length = s.length();
            if (s_length==8) { X="settings";id=Id_settings; }
            else if (s_length==11) { X="setSettings";id=Id_setSettings; }
            else if (s_length==15) { X="defaultSettings";id=Id_defaultSettings; }
            if (X!=null && X!=s && !X.equals(s)) id = 0;
        }
// #/generated#
        return id;
    }
// #/string_id_map#

    protected void initPrototypeId(int id)
    {
        String s;
        int arity;
        switch (id) {
          case Id_defaultSettings:  arity=0; s="defaultSettings";  break;
          case Id_settings:         arity=0; s="settings";         break;
          case Id_setSettings:      arity=1; s="setSettings";      break;
          default: throw new IllegalArgumentException(String.valueOf(id));
        }
        initPrototypeMethod(XMLCTOR_TAG, id, s, arity);
    }

    public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
                             Scriptable thisObj, Object[] args)
    {
        if (!f.hasTag(XMLCTOR_TAG)) {
            return super.execIdCall(f, cx, scope, thisObj, args);
        }
        int id = f.methodId();
        switch (id) {
          case Id_defaultSettings: {
            lib.defaultSettings();
            Scriptable obj = cx.newObject(scope);
            writeSetting(obj);
            return obj;
          }
          case Id_settings: {
            Scriptable obj = cx.newObject(scope);
            writeSetting(obj);
            return obj;
          }
          case Id_setSettings: {
            Scriptable obj = null;
            if (args.length == 0
                || args[0] == null
                || args[0] == Undefined.instance)
            {
                lib.defaultSettings();
            } else if (args[0] instanceof Scriptable) {
                readSettings((Scriptable)args[0]);
            }
            return Undefined.instance;
          }
        }
        throw new IllegalArgumentException(String.valueOf(id));
    }
}