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background_page.html
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<html>
<head>
<script type="text/javascript" src="commands.js"/>
<script type="text/javascript" charset="utf-8">
// Currently we need to remember to change this each time we push. Chromium #15242 will enable us
// to retrieve this programmatically.
var currentVersion = "1.16";
var tabQueue = {}; // windowId -> Array
var keyQueue = ""; // Queue of keys typed
var validFirstKeys = {};
var singleKeyCommands = [];
var hasModifierRegex = /^<[amc]-.>/;
var defaultSettings = {
scrollStepSize: 60,
defaultZoomLevel: 100,
linkHintCharacters: "sadfjklewcmpgh",
userDefinedLinkHintCss:
".vimiumHintMarker {\n\n}\n" +
".vimiumHintMarker > .matchingCharacter {\n\n}"
};
// This is the base internal link hints CSS. It's combined with the userDefinedLinkHintCss before
// being sent to the frontend.
var linkHintCss =
'.internalVimiumHintMarker {' +
'position:absolute;' +
'background-color:yellow;' +
'color:black;' +
'font-weight:bold;' +
'font-size:12px;' +
'padding:0 1px;' +
'line-height:100%;' +
'width:auto;' +
'display:block;' +
'border:1px solid #E3BE23;' +
'z-index:99999999;' +
'font-family:"Helvetica Neue", "Helvetica", "Arial", "Sans";' +
'}' +
'.internalVimiumHintMarker > .matchingCharacter {' +
'color:#C79F0B;' +
'}';
// Port handler mapping
var portHandlers = {
keyDown: handleKeyDown,
returnScrollPosition: handleReturnScrollPosition,
isEnabledForUrl: isEnabledForUrl,
getCurrentTabUrl: getCurrentTabUrl,
getZoomLevel: getZoomLevel,
saveZoomLevel: saveZoomLevel,
getSetting: getSetting
};
var sendRequestHandlers = {
getCompletionKeys: getCompletionKeys,
getLinkHintCss: getLinkHintCss,
upgradeNotificationClosed: upgradeNotificationClosed
};
// Event handlers
var selectionChangedHandlers = [];
var getScrollPositionHandlers = {}; // tabId -> function(tab, scrollX, scrollY);
var tabLoadedHandlers = {}; // tabId -> function()
chrome.extension.onConnect.addListener(function(port, name) {
var senderTabId = port.sender.tab ? port.sender.tab.id : null;
// If this is a tab we've been waiting to open, execute any "tab loaded" handlers, e.g. to restore
// the tab's scroll position. Wait until domReady before doing this; otherwise operations like restoring
// the scroll position will not be possible.
if (port.name == "domReady" && senderTabId != null) {
if (tabLoadedHandlers[senderTabId]) {
var toCall = tabLoadedHandlers[senderTabId];
// Delete first to be sure there's no circular events.
delete tabLoadedHandlers[senderTabId];
toCall.call();
}
// domReady is the appropriate time to show the "vimium has been upgraded" message.
if (shouldShowUpgradeMessage())
chrome.tabs.sendRequest(senderTabId, { name: "showUpgradeNotification", version: currentVersion });
}
if (portHandlers[port.name])
port.onMessage.addListener(portHandlers[port.name]);
});
chrome.extension.onRequest.addListener(function (request, sender, sendResponse) {
var senderTabId = sender.tab ? sender.tab.id : null;
if (sendRequestHandlers[request.handler])
sendResponse(sendRequestHandlers[request.handler](request));
});
function handleReturnScrollPosition(args) {
if (getScrollPositionHandlers[args.currentTab.id]) {
// Delete first to be sure there's no circular events.
var toCall = getScrollPositionHandlers[args.currentTab.id];
delete getScrollPositionHandlers[args.currentTab.id];
toCall(args.currentTab, args.scrollX, args.scrollY);
}
}
/*
* Used by the content scripts to get their full URL. This is needed for URLs like "view-source:http:// .."
* because window.location doesn't know anything about the Chrome-specific "view-source:".
*/
function getCurrentTabUrl(args, port) {
var returnPort = chrome.tabs.connect(port.tab.id, { name: "returnCurrentTabUrl" });
returnPort.postMessage({ url: port.tab.url });
}
/*
* Checks the user's preferences in local storage to determine if Vimium is enabled for the given URL.
*/
function isEnabledForUrl(args, port) {
var returnPort = chrome.tabs.connect(port.tab.id, { name: "returnIsEnabledForUrl" });
// excludedUrls are stored as a series of URL expressions separated by newlines.
var excludedUrls = (localStorage["excludedUrls"] || "").split("\n");
var isEnabled = true;
for (var i = 0; i < excludedUrls.length; i++) {
// The user can add "*" to the URL which means ".*"
var regexp = new RegExp("^" + excludedUrls[i].replace(/\*/g, ".*") + "$");
if (args.url.match(regexp))
isEnabled = false;
}
returnPort.postMessage({ isEnabledForUrl: isEnabled });
}
/*
* Returns the previously saved zoom level for the current tab, or the default zoom level
*/
function getZoomLevel(args, port) {
var returnPort = chrome.tabs.connect(port.tab.id, { name: "returnZoomLevel" });
var localStorageKey = "zoom" + args.domain;
var zoomLevelForDomain = (localStorage[localStorageKey] || "").split(",")[1];
var zoomLevel = parseInt(zoomLevelForDomain || localStorage["defaultZoomLevel"] ||
defaultSettings.defaultZoomLevel);
returnPort.postMessage({ zoomLevel: zoomLevel });
}
function showHelp() {
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendRequest(tab.id, { name: "showHelpDialog", dialogHtml: helpDialogHtml() });
});
}
/*
* Retrieves the help dialog HTML template from a file, and populates it with the latest keybindings.
*/
function helpDialogHtml(showUnboundCommands, showCommandNames, customTitle) {
var commandsToKey = {};
for (var key in keyToCommandRegistry) {
var command = keyToCommandRegistry[key].command;
commandsToKey[command] = (commandsToKey[command] || []).concat(key);
}
var dialogHtml = fetchFileContents("helpDialog.html");
for (var group in commandGroups)
dialogHtml = dialogHtml.replace("{{" + group + "}}",
helpDialogHtmlForCommandGroup(group, commandsToKey, availableCommands,
showUnboundCommands, showCommandNames));
dialogHtml = dialogHtml.replace("{{version}}", currentVersion);
dialogHtml = dialogHtml.replace("{{title}}", customTitle || "Help");
return dialogHtml;
}
/*
* Generates HTML for a given set of commands. commandGroups are defined in commands.js
*/
function helpDialogHtmlForCommandGroup(group, commandsToKey, availableCommands,
showUnboundCommands, showCommandNames) {
var html = [];
for (var i = 0; i < commandGroups[group].length; i++) {
var command = commandGroups[group][i];
bindings = (commandsToKey[command] || [""]).join(", ")
if (showUnboundCommands || commandsToKey[command])
{
html.push("<tr><td>", escapeHtml(bindings),
"</td><td>:</td><td>", availableCommands[command].description);
if (showCommandNames)
html.push("<span class='commandName'>(" + command + ")</span>");
html.push("</td></tr>");
}
}
return html.join("\n");
}
function escapeHtml(string) { return string.replace(/</g, "<").replace(/>/g, ">"); }
/*
* Fetches the contents of a file bundled with this extension.
*/
function fetchFileContents(extensionFileName) {
var req = new XMLHttpRequest();
req.open("GET", chrome.extension.getURL(extensionFileName), false); // false => synchronous
req.send();
return req.responseText;
}
/**
* Returns the keys that can complete a valid command given the current key queue.
*/
function getCompletionKeys(request) {
return {completionKeys: generateCompletionKeys()};
}
/*
* Returns the core CSS used for link hints, along with any user-provided overrides.
*/
function getLinkHintCss(request) {
return { linkHintCss: linkHintCss + (localStorage['userDefinedLinkHintCss'] || "") };
}
/*
* Called when the user has clicked the close icon on the "Vimium has been updated" message.
* We should now dismiss that message in all tabs.
*/
function upgradeNotificationClosed(request) {
localStorage.previousVersion = currentVersion;
sendRequestToAllTabs({ name: "hideUpgradeNotification" });
}
/*
* Used by the content scripts to get settings from the local storage.
*/
function getSetting(args, port) {
var value = localStorage[args.key] ? localStorage[args.key] : defaultSettings[args.key];
var returnPort = chrome.tabs.connect(port.tab.id, { name: "returnSetting" });
returnPort.postMessage({ key: args.key, value: value });
}
/*
* Persists the current zoom level for a given domain
*/
function saveZoomLevel(args) {
var localStorageKey = "zoom" + args.domain;
// TODO(philc): We might want to consider expiring these entries after X months as NoSquint does.
// Note(philc): We might also want to jsonify this hash instead of polluting our local storage keyspace.
localStorage[localStorageKey] = [getCurrentTimeInSeconds(), args.zoomLevel].join(",");
}
function getCurrentTimeInSeconds() { Math.floor((new Date()).getTime() / 1000); }
chrome.tabs.onSelectionChanged.addListener(function(tabId, selectionInfo) {
if (selectionChangedHandlers.length > 0) { selectionChangedHandlers.pop().call(); }
});
function repeatFunction(func, totalCount, currentCount) {
if (currentCount < totalCount)
func(function() { repeatFunction(func, totalCount, currentCount + 1); });
}
// Returns the currently selected tab along with scroll coordinates. Pass in a callback of the form:
// function(tab, scrollX, scrollY) { .. }
function getCurrentTabWithScrollPosition(callback) {
chrome.tabs.getSelected(null, function(tab) {
getScrollPositionHandlers[tab.id] = callback;
var scrollPort = chrome.tabs.connect(tab.id, { name: "getScrollPosition" });
scrollPort.postMessage({currentTab: tab});
});
}
// Start action functions
function createTab(callback) {
chrome.tabs.create({}, function(tab) { callback(); });
}
function nextTab() { selectTab("next"); }
function previousTab() { selectTab("previous"); }
/*
* Selects a tab before or after the currently selected tab. Direction is either "next" or "previous".
*/
function selectTab(direction) {
chrome.tabs.getAllInWindow(null, function(tabs) {
if (tabs.length <= 1)
return;
for (var i = 0; i < tabs.length; i++) {
if (tabs[i].selected) {
var delta = (direction == "next") ? 1 : -1;
var toSelect = tabs[(i + delta + tabs.length) % tabs.length];
chrome.tabs.update(toSelect.id, { selected: true });
break;
}
}
});
}
function removeTab(callback) {
getCurrentTabWithScrollPosition(function(tab, scrollX, scrollY) {
var tabQueueEntry = { tabUrl: tab.url,
scrollX: scrollX,
scrollY: scrollY };
if (tabQueue[tab.windowId])
tabQueue[tab.windowId].push(tabQueueEntry);
else
tabQueue[tab.windowId] = [tabQueueEntry];
chrome.tabs.remove(tab.id);
// We can't just call the callback here because we actually need to wait
// for the selection to change to consider this action done.
selectionChangedHandlers.push(callback);
});
}
function restoreTab(callback) {
// TODO(ilya): Should this be getLastFocused instead?
chrome.windows.getCurrent(function(window) {
if (tabQueue[window.id] && tabQueue[window.id].length > 0)
{
var tabQueueEntry = tabQueue[window.id].pop();
// Clean out the tabQueue so we don't have unused windows laying about.
if (tabQueue[window.id].length == 0)
delete tabQueue[window.id];
// We have to chain a few callbacks to set the appropriate scroll position. We can't just wait until the
// tab is created because the content script is not available during the "loading" state. We need to
// wait until that's over before we can call setScrollPosition.
chrome.tabs.create({ url: tabQueueEntry.tabUrl }, function(tab) {
tabLoadedHandlers[tab.id] = function() {
var scrollPort = chrome.tabs.connect(tab.id, {name: "setScrollPosition"});
scrollPort.postMessage({ scrollX: tabQueueEntry.scrollX, scrollY: tabQueueEntry.scrollY });
};
callback();
});
}
});
}
// End action functions
function splitKeyIntoFirstAndSecond(key) {
if (key.search(hasModifierRegex) == 0)
return { first: key.slice(0, 5), second: key.slice(5) };
else
return { first: key[0], second: key.slice(1) };
}
function getActualKeyStrokeLength(key) {
if (key.search(hasModifierRegex) == 0)
return 1 + getActualKeyStrokeLength(key.slice(5));
else
return key.length;
}
function populateValidFirstKeys() {
for (var key in keyToCommandRegistry)
{
if (getActualKeyStrokeLength(key) == 2)
validFirstKeys[splitKeyIntoFirstAndSecond(key).first] = true;
}
}
function populateSingleKeyCommands() {
for (var key in keyToCommandRegistry)
{
if (getActualKeyStrokeLength(key) == 1)
singleKeyCommands.push(key);
}
}
function refreshCompletionKeysAfterMappingSave() {
validFirstKeys = {};
singleKeyCommands = [];
populateValidFirstKeys();
populateSingleKeyCommands();
sendRequestToAllTabs({ name: "refreshCompletionKeys", completionKeys: generateCompletionKeys() });
}
/*
* Generates a list of keys that can complete a valid command given the current key queue or the one passed
* in.
*/
function generateCompletionKeys(keysToCheck) {
var splitHash = splitKeyQueue(keysToCheck || keyQueue);
command = splitHash.command;
count = splitHash.count;
var completionKeys = singleKeyCommands.slice(0);
if (getActualKeyStrokeLength(command) == 1)
{
for (var key in keyToCommandRegistry)
{
var splitKey = splitKeyIntoFirstAndSecond(key);
if (splitKey.first == command)
completionKeys.push(splitKey.second);
}
}
return completionKeys;
}
function splitKeyQueue(queue) {
var match = /([0-9]*)(.*)/.exec(queue);
var count = parseInt(match[1]);
var command = match[2];
return {count: count, command: command};
}
function handleKeyDown(key, port) {
if (key == "<ESC>") {
console.log("clearing keyQueue");
keyQueue = ""
}
else {
console.log("checking keyQueue: [", keyQueue + key, "]");
keyQueue = checkKeyQueue(keyQueue + key, port.tab.id);
console.log("new KeyQueue: " + keyQueue);
}
}
function checkKeyQueue(keysToCheck, tabId) {
var refreshedCompletionKeys = false;
var splitHash = splitKeyQueue(keysToCheck);
command = splitHash.command;
count = splitHash.count;
if (command.length == 0) { return keysToCheck; }
if (isNaN(count)) { count = 1; }
if (keyToCommandRegistry[command]) {
registryEntry = keyToCommandRegistry[command];
console.log("command found for [", keysToCheck, "],", registryEntry.command);
if (!registryEntry.isBackgroundCommand) {
var port = chrome.tabs.connect(tabId, { name: "executePageCommand" });
port.postMessage({ command: registryEntry.command, count: count,
completionKeys: generateCompletionKeys("") });
refreshedCompletionKeys = true;
} else {
repeatFunction(this[registryEntry.command], count, 0);
}
newKeyQueue = "";
} else if (getActualKeyStrokeLength(command) > 1) {
var splitKey = splitKeyIntoFirstAndSecond(command);
// The second key might be a valid command by its self.
if (keyToCommandRegistry[splitKey.second])
newKeyQueue = checkKeyQueue(splitKey.second);
else
newKeyQueue = (validFirstKeys[splitKey.second] ? splitKey.second : "");
} else {
newKeyQueue = (validFirstKeys[command] ? count.toString() + command : "");
}
// If we haven't sent the completion keys piggybacked on executePageCommand,
// send them by themselves.
if (!refreshedCompletionKeys)
{
var port = chrome.tabs.connect(tabId, { name: "refreshCompletionKeys" });
port.postMessage({ completionKeys: generateCompletionKeys(newKeyQueue) });
}
return newKeyQueue;
}
/*
* Message all tabs. Args should be the arguments hash used by the Chrome sendRequest API.
*/
function sendRequestToAllTabs(args) {
chrome.windows.getAll({ populate: true }, function(windows) {
for (var i = 0; i < windows.length; i++)
for (var j = 0; j < windows[i].tabs.length; j++)
chrome.tabs.sendRequest(windows[i].tabs[j].id, args, null);
});
}
// Compares two version strings (e.g. "1.1" and "1.5") and returns
// -1 if versionA is < versionB, 0 if they're equal, and 1 if versionA is > versionB.
function compareVersions(versionA, versionB) {
versionA = versionA.split(".");
versionB = versionB.split(".");
for (var i = 0; i < Math.max(versionA.length, versionB.length); i++) {
var a = parseInt(versionA[i] || 0);
var b = parseInt(versionB[i] || 0);
if (a < b) return -1;
else if (a > b) return 1;
}
return 0;
}
/*
* Returns true if the current extension version is greater than the previously recorded version in
* localStorage, and false otherwise.
*/
function shouldShowUpgradeMessage() {
// Avoid showing the upgrade notification when localStorage.previousVersion is undefined, which is the
// case for new installs.
if (!localStorage.previousVersion)
localStorage.previousVersion = currentVersion;
return compareVersions(currentVersion, localStorage.previousVersion) == 1;
}
function init() {
clearKeyMappingsAndSetDefaults();
if (localStorage["keyMappings"])
parseCustomKeyMappings(localStorage["keyMappings"]);
populateValidFirstKeys();
populateSingleKeyCommands();
if (shouldShowUpgradeMessage())
sendRequestToAllTabs({ name: "showUpgradeNotification", version: currentVersion });
}
init();
</script>
</head>
</html>