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Jelly binding module for Stapler
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/*******************************************************************************
 *
 * Copyright (c) 2004-2010 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: 
 *
 *    Kohsuke Kawaguchi
 *     
 *******************************************************************************/ 

package org.kohsuke.stapler.jelly;

import org.apache.commons.jelly.expression.Expression;
import org.apache.commons.jelly.expression.ExpressionSupport;
import org.apache.commons.jelly.JellyException;
import org.apache.commons.jelly.JellyContext;
import org.jvnet.localizer.LocaleProvider;
import org.kohsuke.stapler.Stapler;

import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Arrays;

/**
 * Expression of the form "%messageName(arg1,arg2,...)" that represents
 * internationalized text.
 *
 * 
 * The "(arg1,...)" portion is optional and can be ommitted. Each argument
 * is assumed to be a parenthesis-balanced expression and passed to
 * {@link JellyClassLoaderTearOff#EXPRESSION_FACTORY} to be parsed.
 *
 * 

 * The message resource is loaded from files like "xyz.properties" and
 * "xyz_ja.properties" when the expression is placed in "xyz.jelly". 
 *
 *
 * @author Kohsuke Kawaguchi
 */
public class InternationalizedStringExpression extends ExpressionSupport {
    public final ResourceBundle resourceBundle;
    private final Expression[] arguments;
    public final String key;
    public final String expressionText;

    public InternationalizedStringExpression(ResourceBundle resourceBundle, String text) throws JellyException {
        this.resourceBundle = resourceBundle;
        this.expressionText = text;
        if(!text.startsWith("%"))
            throw new JellyException(text+" doesn't start with %");
        text = text.substring(1);

        int idx = text.indexOf('(');
        if(idx<0) {
            // no arguments
            key = text;
            arguments = EMPTY_ARGUMENTS;
            return;
        }

        List args = new ArrayList();
        key = text.substring(0,idx);
        text = text.substring(idx+1);   // at this point text="arg,arg)"
        while(text.length()>0) {
            String token = tokenize(text);
            args.add(JellyClassLoaderTearOff.EXPRESSION_FACTORY.createExpression(token));
            text = text.substring(token.length()+1);
        }

        this.arguments = args.toArray(new Expression[args.size()]);
    }
    
    public List getArguments() {
        return Collections.unmodifiableList(Arrays.asList(arguments));
    }

    /**
     * Takes a string like "arg)" or "arg,arg,...)", then
     * find "arg" and returns it.
     *
     * Note: this code is also copied into idea-stapler-plugin,
     * so don't forget to update that when this code changes.
     */
    private String tokenize(String text) throws JellyException {
        int parenthesis=0;
        for(int idx=0;idx