/*
 * Copyright 2007 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.dev.js.ast;

/**
 * The root scope is the parent of every scope. All identifiers in this scope
 * are not obfuscatable.
 */
public final class JsRootScope extends JsScope {

  private final JsProgram program;

  public JsRootScope(JsProgram program) {
    super("Root");
    this.program = program;
    ctorAddKnownGlobalSymbols();
  }

  @Override
  public JsProgram getProgram() {
    return program;
  }

  @Override
  protected JsName doCreateName(String ident, String shortIdent) {
    JsName name = super.doCreateName(ident, shortIdent);
    name.setObfuscatable(false);
    return name;
  }

  private void ctorAddKnownGlobalSymbols() {
    // Section references are from Ecma-262
    // (http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf)
    String[] commonBuiltins = new String[] {
        // 15.1.1 Value Properties of the Global Object
        "NaN",
        "Infinity",
        "undefined",

        // 15.1.2 Function Properties of the Global Object
        "eval", "parseInt", "parseFloat",
        "isNan",
        "isFinite",

        // 15.1.3 URI Handling Function Properties
        "decodeURI", "decodeURIComponent",
        "encodeURI",
        "encodeURIComponent",

        // 15.1.4 Constructor Properties of the Global Object
        "Object", "Function", "Array", "String", "Boolean", "Number", "Date",
        "RegExp", "Error", "EvalError", "RangeError", "ReferenceError",
        "SyntaxError", "TypeError", "URIError",

        // 15.1.5 Other Properties of the Global Object
        "Math",

        // 10.1.6 Activation Object
        "arguments",

        // B.2 Additional Properties (non-normative)
        "escape", "unescape",

        // Window props (https://developer.mozilla.org/en/DOM/window)
        "applicationCache", "closed", "Components", "content", "controllers",
        "crypto", "defaultStatus", "dialogArguments", "directories",
        "document", "frameElement", "frames", "fullScreen", "globalStorage",
        "history", "innerHeight", "innerWidth", "length",
        "location", "locationbar", "localStorage", "menubar",
        "mozInnerScreenX", "mozInnerScreenY", "mozScreenPixelsPerCssPixel",
        "name", "navigator", "opener", "outerHeight", "outerWidth",
        "pageXOffset", "pageYOffset", "parent", "personalbar", "pkcs11",
        "returnValue", "screen", "scrollbars", "scrollMaxX", "scrollMaxY",
        "self", "sessionStorage", "sidebar", "status", "statusbar", "toolbar",
        "top", "window",

        // Window methods (https://developer.mozilla.org/en/DOM/window)
        "alert", "addEventListener", "atob", "back", "blur", "btoa",
        "captureEvents", "clearInterval", "clearTimeout", "close", "confirm",
        "disableExternalCapture", "dispatchEvent", "dump",
        "enableExternalCapture", "escape", "find", "focus", "forward",
        "GeckoActiveXObject", "getAttention", "getAttentionWithCycleCount",
        "getComputedStyle", "getSelection", "home", "maximize", "minimize",
        "moveBy", "moveTo", "open", "openDialog", "postMessage", "print",
        "prompt", "QueryInterface", "releaseEvents", "removeEventListener",
        "resizeBy", "resizeTo", "restore", "routeEvent", "scroll", "scrollBy",
        "scrollByLines", "scrollByPages", "scrollTo", "setInterval",
        "setResizeable", "setTimeout", "showModalDialog", "sizeToContent",
        "stop", "uuescape", "updateCommands", "XPCNativeWrapper",
        "XPCSafeJSOjbectWrapper",

        // Mozilla Window event handlers, same cite
        "onabort", "onbeforeunload", "onchange", "onclick", "onclose",
        "oncontextmenu", "ondragdrop", "onerror", "onfocus", "onhashchange",
        "onkeydown", "onkeypress", "onkeyup", "onload", "onmousedown",
        "onmousemove", "onmouseout", "onmouseover", "onmouseup",
        "onmozorientation", "onpaint", "onreset", "onresize", "onscroll",
        "onselect", "onsubmit", "onunload",
        
        // extra window methods
        "uneval",
        
        // keywords https://developer.mozilla.org/en/New_in_JavaScript_1.7,
        // https://developer.mozilla.org/en/New_in_JavaScript_1.8.1
        "getPrototypeOf", "let", 
        
        // "future reserved words"
        "abstract", "int", "short", "boolean", "interface", "static", "byte",
        "long", "char", "final", "native", "synchronized", "float", "package",
        "throws", "goto", "private", "transient", "implements", "protected",
        "volatile", "double", "public",
        
        // IE methods
        // (http://msdn.microsoft.com/en-us/library/ms535873(VS.85).aspx#)
        "attachEvent", "clientInformation", "clipboardData", "createPopup",
        "dialogHeight", "dialogLeft", "dialogTop", "dialogWidth",
        "onafterprint", "onbeforedeactivate", "onbeforeprint",
        "oncontrolselect", "ondeactivate", "onhelp", "onresizeend", 

        // Common browser-defined identifiers not defined in ECMAScript
        "event", "external", "Debug", "Enumerator", "Global", "Image",
        "ActiveXObject", "VBArray", "Components",

        // Functions commonly defined on Object
        "toString", "getClass", "constructor", "prototype",

        // Client-side JavaScript identifiers, which are needed for linkers
        // that don't ensure GWT's window != $wnd, document != $doc, etc.
        // Taken from the Rhino book, pg 715
        "Anchor", "Applet", "Attr", "Canvas", "CanvasGradient", 
        "CanvasPattern", "CanvasRenderingContext2D", "CDATASection",
        "CharacterData", "Comment", "CSS2Properties", "CSSRule",
        "CSSStyleSheet", "Document", "DocumentFragment", "DocumentType",
        "DOMException", "DOMImplementation", "DOMParser", "Element", "Event",
        "ExternalInterface", "FlashPlayer", "Form", "Frame", "History",
        "HTMLCollection", "HTMLDocument", "HTMLElement", "IFrame", "Image",
        "Input", "JSObject", "KeyEvent", "Link", "Location", "MimeType",
        "MouseEvent", "Navigator", "Node", "NodeList", "Option", "Plugin",
        "ProcessingInstruction", "Range", "RangeException", "Screen", "Select",
        "Table", "TableCell", "TableRow", "TableSelection", "Text", "TextArea",
        "UIEvent", "Window", "XMLHttpRequest", "XMLSerializer",
        "XPathException", "XPathResult", "XSLTProcessor",
        
        /*
         * These keywords trigger the loading of the java-plugin. For the
         * next-generation plugin, this results in starting a new Java process.
         */
        "java", "Packages", "netscape", "sun", "JavaObject", "JavaClass",
        "JavaArray", "JavaMember",

        // GWT-defined identifiers
        "$wnd", "$doc", "$entry", "$moduleName", "$moduleBase", "$gwt_version", "$sessionId",

        // Identifiers used by JsStackEmulator; later set to obfuscatable
        "$stack", "$stackDepth", "$location",

        // TODO: prove why this is necessary or remove it
        "call",};

    for (int i = 0; i < commonBuiltins.length; i++) {
      String ident = commonBuiltins[i];
      this.doCreateName(ident, ident);
    }
  }
}