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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Helper functions and objects for the JS debugger UI.
* @see debugger.html
*/
/**
* Document load listener.
*/
function onLoad() {
var debuggerConsole = new DebuggerConsole();
DebuggerIPC.init(debuggerConsole);
DebugShell.initDebugShell(debuggerConsole);
debuggerConsole.focusOnCommandLine();
}
/**
* @constructor
*/
function DebuggerConsole()
{
this._output = document.getElementById("output");
var input = document.getElementById("command-line-text");
var self = this;
input.addEventListener(
'keydown',
function(e) {
return self._onInputKeyDown(e);
},
true);
input.addEventListener(
'keypress',
function(e) {
return self._onInputKeyPress(e);
},
true);
this._commandLineInput = input;
// command object stores command-line history state.
this._command = {
history: [],
history_index: 0,
pending: null
};
};
DebuggerConsole.prototype = {
/**
* Sets focus to command-line-text element.
*/
focusOnCommandLine: function() {
this._commandLineInput.focus();
},
/**
* Called by chrome code when there's output to display.
* @param {string} txt
*/
appendText: function(txt)
{
this._output.appendChild(document.createTextNode(txt));
this._output.appendChild(document.createElement('br'));
document.body.scrollTop = document.body.scrollHeight;
},
/**
* Called by chrome code to set the current state as to whether the debugger
* is stopped at a breakpoint or is running.
* @param {boolean} isBroken
*/
setDebuggerBreak: function(isBroken)
{
var out = this._output;
if (isBroken) {
out.style.color = "black";
this.focusOnCommandLine();
} else {
out.style.color = "gray";
}
},
/**
* Execute a debugger command, add it to the command history and display it in
* the output window.
* @param {string} str
*/
executeCommand: function(str) {
this.appendText("$ " + str);
// Sends message to DebuggerContents.HandleCommand.
if (DebugShell.singleton) {
DebugShell.singleton.command(str);
} else {
this.appendText("FAILED to send the command as DebugShell is null");
}
this._command.history.push(str);
this._command.history_index = this._command.history.length;
this._command.pending = null;
},
/**
* Display the previous history item in the given text field.
* @param {HTMLInputElement} field
*/
selectPreviousCommand_: function(field) {
var command = this._command;
if (command.history_index > 0) {
// Remember the current field value as a pending command if we're at the
// end (it's something the user typed in).
if (command.history_index == command.history.length)
command.pending = field.value;
command.history_index--;
field.value = command.history[command.history_index];
field.select();
}
},
/**
* Display the next history item in the given text field.
* @param {HTMLInputElement} field
*/
selectNextCommand_: function(field) {
var command = this._command;
if (command.history_index < command.history.length) {
command.history_index++;
if (command.history_index == command.history.length) {
field.value = command.pending || "";
} else {
field.value = command.history[command.history_index];
}
field.select();
}
},
/**
* command-line-text's onkeydown handler.
* @param {KeyboardEvent} e
* @return {boolean}
*/
_onInputKeyDown: function (e) {
var field = e.target;
var key = e.keyCode;
if (key == 38) { // up arrow
this.selectPreviousCommand_(field);
return false;
} else if (key == 40) { // down arrow
this.selectNextCommand_(field);
return false;
}
return true;
},
/**
* command-line-text's onkeypress handler.
* @param {KeyboardEvent} e
* @return {boolean}
*/
_onInputKeyPress: function (e) {
var field = e.target;
var key = e.keyCode;
if (key == 13) { // enter
this.executeCommand(field.value);
field.value = "";
return false;
}
return true;
}
};
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