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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package org.chromium.sdk.internal.tools.v8.processor;
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import java.util.Collection;
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import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.chromium.sdk.DebugContext;
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import org.chromium.sdk.JavascriptVm;
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import org.chromium.sdk.Script;
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import org.chromium.sdk.internal.ContextBuilder;
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import org.chromium.sdk.internal.DebugSession;
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import org.chromium.sdk.internal.FrameMirror;
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import org.chromium.sdk.internal.HandleManager;
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import org.chromium.sdk.internal.protocol.BacktraceCommandBody;
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import org.chromium.sdk.internal.protocol.CommandResponse;
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import org.chromium.sdk.internal.protocol.FrameObject;
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import org.chromium.sdk.internal.protocol.SuccessCommandResponse;
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import org.chromium.sdk.internal.protocol.data.ScriptHandle;
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import org.chromium.sdk.internal.protocol.data.SomeHandle;
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import org.chromium.sdk.internal.protocolparser.JsonProtocolParseException;
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import org.chromium.sdk.internal.tools.v8.DebuggerCommand;
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import org.chromium.sdk.internal.tools.v8.V8ProtocolUtil;
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import org.json.simple.JSONObject;
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/**
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* Handles the "backtrace" V8 command replies.
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*/
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class BacktraceProcessor implements org.chromium.sdk.internal.tools.v8.V8CommandProcessor.V8HandlerCallback {
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private final ContextBuilder.ExpectingBacktraceStep step2;
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BacktraceProcessor(ContextBuilder.ExpectingBacktraceStep step2) {
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this.step2 = step2;
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}
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public void messageReceived(CommandResponse response) {
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String commandString = response.getCommand();
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DebuggerCommand command = DebuggerCommand.forString(commandString);
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if (command != DebuggerCommand.BACKTRACE) {
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handleWrongStacktrace();
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}
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SuccessCommandResponse successResponse = response.asSuccess();
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if (successResponse == null) {
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handleWrongStacktrace();
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}
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final DebugContext debugContext = setFrames(successResponse);
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final DebugSession debugSession = step2.getInternalContext().getDebugSession();
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JavascriptVm.ScriptsCallback afterScriptsAreLoaded = new JavascriptVm.ScriptsCallback() {
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public void failure(String errorMessage) {
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handleWrongStacktrace();
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}
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public void success(Collection<Script> scripts) {
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debugSession.getDebugEventListener().suspended(debugContext);
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}
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};
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debugSession.getScriptLoader().loadAllScripts(afterScriptsAreLoaded, null);
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}
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private DebugContext setFrames(SuccessCommandResponse response) {
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BacktraceCommandBody body;
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try {
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body = response.getBody().asBacktraceCommandBody();
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} catch (JsonProtocolParseException e) {
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throw new RuntimeException(e);
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}
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List<FrameObject> jsonFrames = body.getFrames();
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int frameCnt = jsonFrames.size();
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FrameMirror[] frameMirrors = new FrameMirror[frameCnt];
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HandleManager handleManager = step2.getInternalContext().getHandleManager();
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List<SomeHandle> refs = response.getRefs();
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handleManager.putAll(refs);
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for (int frameIdx = 0; frameIdx < frameCnt; frameIdx++) {
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FrameObject frameObject = jsonFrames.get(frameIdx);
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int index = (int) frameObject.getIndex();
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FrameObject frame = jsonFrames.get(frameIdx);
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JSONObject func = frame.getFunc();
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String text = frame.getText().replace('\r', ' ').replace('\n', ' ');
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Matcher m = FRAME_TEXT_PATTERN.matcher(text);
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m.matches();
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String url = m.group(1);
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int currentLine = (int) frame.getLine();
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// If we stopped because of the debuggerword then we're on the next
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// line.
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// TODO(apavlov): Terry says: we need to use the [e.g. Rhino] AST to
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// decide if line is debuggerword. If so, find the next sequential line.
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// The below works for simple scripts but doesn't take into account
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// comments, etc.
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String srcLine = frame.getSourceLineText();
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if (srcLine.trim().startsWith(DEBUGGER_RESERVED)) {
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currentLine++;
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}
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Long scriptRef = V8ProtocolUtil.getObjectRef(frame.getScript());
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Long scriptId = -1L;
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if (scriptRef != null) {
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SomeHandle handle = handleManager.getHandle(scriptRef);
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ScriptHandle scriptHandle;
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try {
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scriptHandle = handle.asScriptHandle();
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} catch (JsonProtocolParseException e) {
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throw new RuntimeException(e);
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}
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if (handle != null) {
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scriptId = scriptHandle.id();
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}
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}
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frameMirrors[index] =
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new FrameMirror(frameObject, url, currentLine, scriptId,
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V8ProtocolUtil.getFunctionName(func));
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}
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return step2.setFrames(frameMirrors);
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}
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public void failure(String message) {
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handleWrongStacktrace();
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}
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private void handleWrongStacktrace() {
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step2.getInternalContext().getContextBuilder().buildSequenceFailure();
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}
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private static final String DEBUGGER_RESERVED = "debugger";
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/** Regex for the "text" field of the "backtrace" element response. */
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private static final String FRAME_TEXT_REGEX =
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"^(?:.+) ([^\\s]+) line (.+) column (.+)" + " (?:\\(position (.+)\\))?";
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/** A pattern for the frame "text" regex. */
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private static final Pattern FRAME_TEXT_PATTERN = Pattern.compile(FRAME_TEXT_REGEX);
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}
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