/**
* @fileoverview Helper functions and objects for the JS debugger UI.
* @see debugger.html
*/
/**
* Called at the end of <body>.
*/
function loaded() {
focusOnCommandLine();
};
/**
* Sets focus to command-line-text element.
*/
function focusOnCommandLine() {
var input = document.getElementById('command-line-text');
input.focus();
};
/**
* Called by chrome code when there's output to display.
*/
function appendText(txt) {
var output = document.getElementById('output');
output.appendChild(document.createTextNode(txt));
output.appendChild(document.createElement('br'));
document.body.scrollTop = document.body.scrollHeight;
};
// command object stores command-line history state.
var command = {
history: [],
history_index: 0,
pending: null
};
/**
* Execute a debugger command, add it to the command history and display it in
* the output window.
*/
function executeCommand(str) {
appendText("$ " + str);
// Sends field.value to DebuggerContents.HandleCommand.
chrome.send("command", [str]);
command.history.push(str);
command.history_index = command.history.length;
command.pending = null;
};
/**
* Display the previous history item in the given text field.
*/
function selectPreviousCommand(field) {
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.
*/
function selectNextCommand(field) {
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 onkeypress handler
*/
function keypress(e) {
var field = e.target;
var key = e.keyCode;
if (key == 13) { // enter
executeCommand(field.value);
field.value = "";
return false;
}
return true;
};
/**
* command-line-text's onkeydown handler
*/
function keydown(e) {
var field = e.target;
var key = e.keyCode;
if (key == 38) { // up arrow
selectPreviousCommand(field);
return false;
} else if (key == 40) { // down arrow
selectNextCommand(field);
return false;
}
return true;
};
/**
* Called by chrome code to set the current state as to whether the debugger
* is stopped at a breakpoint or is running.
*/
function setDebuggerBreak(is_broken) {
var out = document.getElementById('output');
if (is_broken) {
out.style.color = "black";
focusOnCommandLine();
} else {
out.style.color = "gray";
}
};