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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.
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/*
 *
 * ***** 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) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Igor Bukanov, [email protected]
 *   Bob Jervis
 *
 * 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 com.google.javascript.rhino;

import java.util.Hashtable;

public class CompilerEnvirons
{
    public CompilerEnvirons()
    {
        languageVersion = Context.VERSION_DEFAULT;
        generateDebugInfo = true;
        useDynamicScope = false;
        reservedKeywordAsIdentifier = false;
        allowMemberExprAsFunctionName = false;
        xmlAvailable = true;
        optimizationLevel = 0;
        generatingSource = true;
        strictMode = false;
        warningAsError = false;
        parseJSDocDocumentation = false;
    }

    public void initFromContext(Context cx)
    {
        setErrorReporter(cx.getErrorReporter());
        this.languageVersion = cx.getLanguageVersion();
        useDynamicScope = cx.compileFunctionsWithDynamicScopeFlag;
        generateDebugInfo = (!cx.isGeneratingDebugChanged()
                             || cx.isGeneratingDebug());
        reservedKeywordAsIdentifier
            = cx.hasFeature(Context.FEATURE_RESERVED_KEYWORD_AS_IDENTIFIER);
        allowMemberExprAsFunctionName
            = cx.hasFeature(Context.FEATURE_MEMBER_EXPR_AS_FUNCTION_NAME);
        strictMode
            = cx.hasFeature(Context.FEATURE_STRICT_MODE);
        warningAsError = cx.hasFeature(Context.FEATURE_WARNING_AS_ERROR);
        xmlAvailable
            = cx.hasFeature(Context.FEATURE_E4X);

        optimizationLevel = cx.getOptimizationLevel();

        generatingSource = cx.isGeneratingSource();
        activationNames = cx.activationNames;
    }

    public final ErrorReporter getErrorReporter()
    {
        return errorReporter;
    }

    public void setErrorReporter(ErrorReporter errorReporter)
    {
        if (errorReporter == null) throw new IllegalArgumentException();
        this.errorReporter = errorReporter;
    }

    public final int getLanguageVersion()
    {
        return languageVersion;
    }

    public void setLanguageVersion(int languageVersion)
    {
        Context.checkLanguageVersion(languageVersion);
        this.languageVersion = languageVersion;
    }

    public final boolean isGenerateDebugInfo()
    {
        return generateDebugInfo;
    }

    public void setGenerateDebugInfo(boolean flag)
    {
        this.generateDebugInfo = flag;
    }

    public final boolean isUseDynamicScope()
    {
        return useDynamicScope;
    }

    public final boolean isReservedKeywordAsIdentifier()
    {
        return reservedKeywordAsIdentifier;
    }

    public void setReservedKeywordAsIdentifier(boolean flag)
    {
        reservedKeywordAsIdentifier = flag;
    }

    public final boolean isAllowMemberExprAsFunctionName()
    {
        return allowMemberExprAsFunctionName;
    }

    public void setAllowMemberExprAsFunctionName(boolean flag)
    {
        allowMemberExprAsFunctionName = flag;
    }

    public final boolean isXmlAvailable()
    {
        return xmlAvailable;
    }

    public void setXmlAvailable(boolean flag)
    {
        xmlAvailable = flag;
    }

    public final int getOptimizationLevel()
    {
        return optimizationLevel;
    }

    public void setOptimizationLevel(int level)
    {
        Context.checkOptimizationLevel(level);
        this.optimizationLevel = level;
    }

    public boolean getAnnotateTypes()
    {
        return annotateTypes;
    }

    public void setAnnotateTypes(boolean flag)
    {
        annotateTypes = flag;
    }

    public final boolean getParseJSDocDocumentation() {
        return parseJSDocDocumentation;
    }

    public void setParseJSDocDocumentation(boolean flag) {
        parseJSDocDocumentation = flag;
    }

    public boolean getParseJSDoc()
    {
        return parseJSDoc;
    }

    public void setParseJSDoc(boolean flag)
    {
        parseJSDoc = flag;
    }

    public final boolean isGeneratingSource()
    {
        return generatingSource;
    }

    public final boolean isStrictMode()
    {
        return strictMode;
    }

    public final boolean reportWarningAsError()
    {
        return warningAsError;
    }
    /**
     * Specify whether or not source information should be generated.
     * 
     * Without source information, evaluating the "toString" method
     * on JavaScript functions produces only "[native code]" for
     * the body of the function.
     * Note that code generated without source is not fully ECMA
     * conformant.
     */
    public void setGeneratingSource(boolean generatingSource)
    {
        this.generatingSource = generatingSource;
    }

    private ErrorReporter errorReporter;

    private int languageVersion;
    private boolean generateDebugInfo;
    private boolean useDynamicScope;
    private boolean reservedKeywordAsIdentifier;
    private boolean allowMemberExprAsFunctionName;
    private boolean xmlAvailable;
    private int optimizationLevel;
    private boolean generatingSource;
    private boolean strictMode;
    private boolean warningAsError;
    private boolean annotateTypes;
    private boolean parseJSDoc;
    private boolean parseJSDocDocumentation;
    Hashtable activationNames;
}