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An XProc 1.0 processor
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/*
 * WWWFormURLDecode.java
 *
 * Copyright 2008 Mark Logic Corporation.
 * Portions Copyright 2007 Sun Microsystems, Inc.
 * All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * https://xproc.dev.java.net/public/CDDL+GPL.html or
 * docs/CDDL+GPL.txt in the distribution. See the License for the
 * specific language governing permissions and limitations under the
 * License. When distributing the software, include this License Header
 * Notice in each file and include the License file at docs/CDDL+GPL.txt.
 */

package com.xmlcalabash.library;

import com.xmlcalabash.core.XMLCalabash;
import com.xmlcalabash.core.XProcConstants;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.util.TreeWriter;
import com.xmlcalabash.util.TypeUtils;
import com.xmlcalabash.io.WritablePipe;
import net.sf.saxon.s9api.SaxonApiException;
import net.sf.saxon.s9api.QName;
import com.xmlcalabash.runtime.XAtomicStep;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

/**
 *
 * @author ndw
 */

@XMLCalabash(
        name = "p:www-form-urldecode",
        type = "{http://www.w3.org/ns/xproc}www-form-urldecode")

public class WWWFormURLDecode extends DefaultStep {
    public static final QName _value = new QName("", "value");
    public static final QName _name = new QName("", "name");
    public static final QName c_paramset = new QName("c",XProcConstants.NS_XPROC_STEP,"param-set");
    public static final QName c_param = new QName("c", XProcConstants.NS_XPROC_STEP, "param");
    private static final QName cx_encoding = new QName("cx", XProcConstants.NS_CALABASH_EX, "encoding");
    private WritablePipe result = null;

    /* Creates a new instance of FormURLDecode */
    public WWWFormURLDecode(XProcRuntime runtime, XAtomicStep step) {
        super(runtime,step);
    }

    public void setOutput(String port, WritablePipe pipe) {
        result = pipe;
    }

    public void reset() {
        result.resetWriter();
    }

    public void run() throws SaxonApiException {
        super.run();

        String value = getOption(_value).getString();

        String encoding = step.getExtensionAttribute(cx_encoding);
        if (encoding == null) {
            encoding = "UTF-8";
        }

        TreeWriter tree = new TreeWriter(runtime);
        tree.startDocument(step.getNode().getBaseURI());
        tree.addStartElement(c_paramset);
        tree.startContent();

        if (!"".equals(value)) {
            String[] params = value.split("&");
            for (String p : params) {
                int pos = p.indexOf("=");
                if (pos > 0) {
                    String name = p.substring(0, pos);
                    String val = p.substring(pos+1);

                    try {
                        name = URLDecoder.decode(name, encoding);
                        val = URLDecoder.decode(val, encoding);
                    } catch (UnsupportedEncodingException e) {
                        throw new XProcException(e);
                    }

                    try {
                        TypeUtils.checkType(runtime, null, name, XProcConstants.xs_NCName, null);
                    } catch (XProcException e) {
                        throw XProcException.stepError(61);
                    }

                    tree.addStartElement(c_param);
                    tree.addAttribute(_name, name);
                    tree.addAttribute(_value, val);
                    tree.startContent();
                    tree.addEndElement();
                } else {
                    throw new XProcException(step, "Badly formatted parameters");
                }
            }
        }

        tree.addEndElement();
        tree.endDocument();
        result.write(tree.getResult());
    }
}