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An annotation processor that is used to generate the HTTP parser
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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 io.undertow.annotationprocessor;

import java.util.concurrent.atomic.AtomicInteger;

import org.jboss.classfilewriter.ClassFile;
import org.jboss.classfilewriter.ClassMethod;
import org.jboss.classfilewriter.code.CodeAttribute;

/**
 * @author Stuart Douglas
 */
public class RequestParserGenerator extends AbstractParserGenerator {

    public static final String PARSE_STATE_CLASS = "io.undertow.server.protocol.http.ParseState";
    public static final String HTTP_EXCHANGE_CLASS = "io.undertow.server.HttpServerExchange";
    public static final String HTTP_EXCHANGE_DESCRIPTOR = "Lio/undertow/server/HttpServerExchange;";
    private static final String CONNECTORS_CLASS = "io.undertow.server.Connectors";


    //parsing states
    public static final int VERB = 0;
    public static final int PATH = 1;
    public static final int PATH_PARAMETERS = 2;
    public static final int QUERY_STRING = 3;
    public static final int VERSION = 4;
    public static final int AFTER_VERSION = 5;
    public static final int HEADER = 6;
    public static final int HEADER_VALUE = 7;

    public RequestParserGenerator(String existingClassName) {
        super(PARSE_STATE_CLASS, HTTP_EXCHANGE_CLASS, "(Lorg/xnio/OptionMap;)V", existingClassName);
    }

    protected void createStateMachines(final String[] httpVerbs, final String[] httpVersions, final String[] standardHeaders, final String className, final ClassFile file, final ClassMethod sctor, final AtomicInteger fieldCounter) {
        createStateMachine(httpVerbs, className, file, sctor, fieldCounter, HANDLE_HTTP_VERB, new VerbStateMachine(), false);
        createStateMachine(httpVersions, className, file, sctor, fieldCounter, HANDLE_HTTP_VERSION, new VersionStateMachine(), true);
        createStateMachine(standardHeaders, className, file, sctor, fieldCounter, HANDLE_HEADER, new HeaderStateMachine(), false);
    }


    protected class HeaderStateMachine implements CustomStateMachine {

        @Override
        public boolean isHeader() {
            return true;
        }

        @Override
        public void handleOtherToken(final CodeAttribute c) {
            c.aload(PARSE_STATE_VAR);
            c.swap();
            c.dup();
            c.invokestatic(CONNECTORS_CLASS, "verifyToken", "(" + HTTP_STRING_DESCRIPTOR + ")V");
            c.putfield(parseStateClass, "nextHeader", HTTP_STRING_DESCRIPTOR);
        }

        @Override
        public void handleStateMachineMatchedToken(final CodeAttribute c) {
            c.aload(PARSE_STATE_VAR);
            c.swap();
            c.putfield(parseStateClass, "nextHeader", HTTP_STRING_DESCRIPTOR);
        }

        @Override
        public void updateParseState(final CodeAttribute c) {
            c.pop();
            c.aload(PARSE_STATE_VAR);
            c.iconst(HEADER_VALUE);
            c.putfield(parseStateClass, "state", "I");
        }

        @Override
        public boolean initialNewlineMeansRequestDone() {
            return true;
        }
    }


    protected class VersionStateMachine implements CustomStateMachine {

        @Override
        public boolean isHeader() {
            return false;
        }

        @Override
        public void handleOtherToken(final CodeAttribute c) {
            c.aload(HTTP_RESULT);
            c.swap();
            c.invokevirtual(resultClass, "setProtocol", "(" + HTTP_STRING_DESCRIPTOR + ")"+ HTTP_EXCHANGE_DESCRIPTOR);
            c.pop();
        }

        @Override
        public void handleStateMachineMatchedToken(final CodeAttribute c) {
            c.aload(HTTP_RESULT);
            c.swap();
            c.invokevirtual(resultClass, "setProtocol", "(" + HTTP_STRING_DESCRIPTOR + ")" + HTTP_EXCHANGE_DESCRIPTOR);
            c.pop();
        }

        @Override
        public void updateParseState(final CodeAttribute c) {
            c.aload(PARSE_STATE_VAR);
            c.swap();
            c.putfield(parseStateClass, "leftOver", "B");
            c.aload(PARSE_STATE_VAR);
            c.iconst(AFTER_VERSION);
            c.putfield(parseStateClass, "state", "I");
        }

        @Override
        public boolean initialNewlineMeansRequestDone() {
            return false;
        }

    }

    private class VerbStateMachine implements CustomStateMachine {

        @Override
        public boolean isHeader() {
            return false;
        }

        @Override
        public void handleStateMachineMatchedToken(final CodeAttribute c) {
            c.aload(HTTP_RESULT);
            c.swap();
            c.invokevirtual(resultClass, "setRequestMethod", "(" + HTTP_STRING_DESCRIPTOR + ")" + HTTP_EXCHANGE_DESCRIPTOR);
            c.pop();
        }

        @Override
        public void handleOtherToken(final CodeAttribute c) {
            c.aload(HTTP_RESULT);
            c.swap();
            c.dup();
            c.invokestatic(CONNECTORS_CLASS, "verifyToken", "(" + HTTP_STRING_DESCRIPTOR + ")V");
            c.invokevirtual(resultClass, "setRequestMethod", "(" + HTTP_STRING_DESCRIPTOR + ")" + HTTP_EXCHANGE_DESCRIPTOR);
            c.pop();
        }

        @Override
        public void updateParseState(final CodeAttribute c) {
            c.pop();
            c.aload(PARSE_STATE_VAR);
            c.iconst(PATH);
            c.putfield(parseStateClass, "state", "I");
        }

        @Override
        public boolean initialNewlineMeansRequestDone() {
            return false;
        }
    }
}