Escape.java

/*
 * Copyright 2013 JBoss 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 org.dynjs.runtime.builtins;

import org.dynjs.runtime.AbstractNativeFunction;
import org.dynjs.runtime.ExecutionContext;
import org.dynjs.runtime.GlobalContext;
import org.dynjs.runtime.Types;

public class Escape extends AbstractNativeFunction {

    private static final String ACCEPT = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@*_+-./";
    
    public Escape(GlobalContext globalContext) {
        super(globalContext, "string");
    }

    @Override
    public Object call(ExecutionContext context, Object self, Object... args) {
        String string = Types.toString(context, args[0]);
        StringBuilder result = new StringBuilder();
        int k = 0;
        for (; k < string.length(); ++k) {
            char c = string.charAt(k);
            if (ACCEPT.indexOf(c) >= 0) {
                result.append(c);
            } else {
                result.append("%").append(Integer.toHexString(c));
            }
        }
        return result.toString();
    }
    
    @Override
    public void setFileName() {
        this.filename = "org/dynjs/runtime/builtins/Escape.java";
    }

    @Override
    public void setupDebugContext() {
        this.debugContext = "<native function: escape>";
    }
}