gecko-dev/browser/devtools/sourceeditor/editor.js

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/* vim:set ts=2 sw=2 sts=2 et tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { Cu, Cc, Ci, components } = require("chrome");
const TAB_SIZE = "devtools.editor.tabsize";
const EXPAND_TAB = "devtools.editor.expandtab";
const L10N_BUNDLE = "chrome://browser/locale/devtools/sourceeditor.properties";
const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
// Maximum allowed margin (in number of lines) from top or bottom of the editor
// while shifting to a line which was initially out of view.
const MAX_VERTICAL_OFFSET = 3;
const promise = require("sdk/core/promise");
const events = require("devtools/shared/event-emitter");
Cu.import("resource://gre/modules/Services.jsm");
const L10N = Services.strings.createBundle(L10N_BUNDLE);
// CM_STYLES, CM_SCRIPTS and CM_IFRAME represent the HTML,
// JavaScript and CSS that is injected into an iframe in
// order to initialize a CodeMirror instance.
const CM_STYLES = [
"chrome://browser/skin/devtools/common.css",
"chrome://browser/content/devtools/codemirror/codemirror.css",
"chrome://browser/content/devtools/codemirror/dialog.css",
"chrome://browser/content/devtools/codemirror/mozilla.css"
];
const CM_SCRIPTS = [
"chrome://browser/content/devtools/theme-switching.js",
"chrome://browser/content/devtools/codemirror/codemirror.js",
"chrome://browser/content/devtools/codemirror/dialog.js",
"chrome://browser/content/devtools/codemirror/searchcursor.js",
"chrome://browser/content/devtools/codemirror/search.js",
"chrome://browser/content/devtools/codemirror/matchbrackets.js",
"chrome://browser/content/devtools/codemirror/closebrackets.js",
"chrome://browser/content/devtools/codemirror/comment.js",
"chrome://browser/content/devtools/codemirror/javascript.js",
"chrome://browser/content/devtools/codemirror/xml.js",
"chrome://browser/content/devtools/codemirror/css.js",
"chrome://browser/content/devtools/codemirror/htmlmixed.js",
"chrome://browser/content/devtools/codemirror/clike.js",
"chrome://browser/content/devtools/codemirror/activeline.js"
];
const CM_IFRAME =
"data:text/html;charset=utf8,<!DOCTYPE html>" +
"<html dir='ltr'>" +
" <head>" +
" <style>" +
" html, body { height: 100%; }" +
" body { margin: 0; overflow: hidden; }" +
" .CodeMirror { width: 100%; height: 100% !important; }" +
" </style>" +
[ " <link rel='stylesheet' href='" + style + "'>" for (style of CM_STYLES) ].join("\n") +
" </head>" +
" <body class='theme-body devtools-monospace'></body>" +
"</html>";
const CM_MAPPING = [
"focus",
"hasFocus",
"lineCount",
"somethingSelected",
"getCursor",
"setSelection",
"getSelection",
"replaceSelection",
"undo",
"redo",
"clearHistory",
"openDialog",
"cursorCoords",
"refresh"
];
const CM_JUMP_DIALOG = [
L10N.GetStringFromName("gotoLineCmd.promptTitle")
+ " <input type=text style='width: 10em'/>"
];
const { cssProperties, cssValues, cssColors } = getCSSKeywords();
const editors = new WeakMap();
Editor.modes = {
text: { name: "text" },
html: { name: "htmlmixed" },
css: { name: "css" },
js: { name: "javascript" },
vs: { name: "x-shader/x-vertex" },
fs: { name: "x-shader/x-fragment" }
};
function ctrl(k) {
return (Services.appinfo.OS == "Darwin" ? "Cmd-" : "Ctrl-") + k;
}
/**
* A very thin wrapper around CodeMirror. Provides a number
* of helper methods to make our use of CodeMirror easier and
* another method, appendTo, to actually create and append
* the CodeMirror instance.
*
* Note that Editor doesn't expose CodeMirror instance to the
* outside world.
*
* Constructor accepts one argument, config. It is very
* similar to the CodeMirror configuration object so for most
* properties go to CodeMirror's documentation (see below).
*
* Other than that, it accepts one additional and optional
* property contextMenu. This property should be an ID of
* an element we can use as a context menu.
*
* This object is also an event emitter.
*
* CodeMirror docs: http://codemirror.net/doc/manual.html
*/
function Editor(config) {
const tabSize = Services.prefs.getIntPref(TAB_SIZE);
const useTabs = !Services.prefs.getBoolPref(EXPAND_TAB);
this.version = null;
this.config = {
value: "",
mode: Editor.modes.text,
indentUnit: tabSize,
tabSize: tabSize,
contextMenu: null,
matchBrackets: true,
extraKeys: {},
indentWithTabs: useTabs,
styleActiveLine: true,
theme: "mozilla"
};
// Overwrite default config with user-provided, if needed.
Object.keys(config).forEach((k) => this.config[k] = config[k]);
// Additional shortcuts.
this.config.extraKeys[ctrl("J")] = (cm) => this.jumpToLine();
this.config.extraKeys[ctrl("/")] = "toggleComment";
// Disable ctrl-[ and ctrl-] because toolbox uses those
// shortcuts.
this.config.extraKeys[ctrl("[")] = false;
this.config.extraKeys[ctrl("]")] = false;
// Overwrite default tab behavior. If something is selected,
// indent those lines. If nothing is selected and we're
// indenting with tabs, insert one tab. Otherwise insert N
// whitespaces where N == indentUnit option.
this.config.extraKeys.Tab = (cm) => {
if (cm.somethingSelected())
return void cm.indentSelection("add");
if (this.config.indentWithTabs)
return void cm.replaceSelection("\t", "end", "+input");
var num = cm.getOption("indentUnit");
if (cm.getCursor().ch !== 0) num -= 1;
cm.replaceSelection(" ".repeat(num), "end", "+input");
};
events.decorate(this);
}
Editor.prototype = {
container: null,
version: null,
config: null,
/**
* Appends the current Editor instance to the element specified by
* the only argument 'el'. This method actually creates and loads
* CodeMirror and all its dependencies.
*
* This method is asynchronous and returns a promise.
*/
appendTo: function (el) {
let def = promise.defer();
let cm = editors.get(this);
let env = el.ownerDocument.createElement("iframe");
env.flex = 1;
if (cm)
throw new Error("You can append an editor only once.");
let onLoad = () => {
// Once the iframe is loaded, we can inject CodeMirror
// and its dependencies into its DOM.
env.removeEventListener("load", onLoad, true);
let win = env.contentWindow.wrappedJSObject;
CM_SCRIPTS.forEach((url) =>
Services.scriptloader.loadSubScript(url, win, "utf8"));
// Replace the propertyKeywords, colorKeywords and valueKeywords
// properties of the CSS MIME type with the values provided by Gecko.
let cssSpec = win.CodeMirror.resolveMode("text/css");
cssSpec.propertyKeywords = cssProperties;
cssSpec.colorKeywords = cssColors;
cssSpec.valueKeywords = cssValues;
win.CodeMirror.defineMIME("text/css", cssSpec);
let scssSpec = win.CodeMirror.resolveMode("text/x-scss");
scssSpec.propertyKeywords = cssProperties;
scssSpec.colorKeywords = cssColors;
scssSpec.valueKeywords = cssValues;
win.CodeMirror.defineMIME("text/x-scss", scssSpec);
// Create a CodeMirror instance add support for context menus,
// overwrite the default controller (otherwise items in the top and
// context menus won't work).
cm = win.CodeMirror(win.document.body, this.config);
cm.getWrapperElement().addEventListener("contextmenu", (ev) => {
ev.preventDefault();
this.showContextMenu(el.ownerDocument, ev.screenX, ev.screenY);
}, false);
cm.on("focus", () => this.emit("focus"));
cm.on("change", () => this.emit("change"));
cm.on("gutterClick", (cm, line) => this.emit("gutterClick", line));
cm.on("cursorActivity", (cm) => this.emit("cursorActivity"));
win.CodeMirror.defineExtension("l10n", (name) => {
return L10N.GetStringFromName(name);
});
cm.getInputField().controllers.insertControllerAt(0, controller(this));
this.container = env;
editors.set(this, cm);
def.resolve();
};
env.addEventListener("load", onLoad, true);
env.setAttribute("src", CM_IFRAME);
el.appendChild(env);
this.once("destroy", () => el.removeChild(env));
return def.promise;
},
/**
* Returns the currently active highlighting mode.
* See Editor.modes for the list of all suppoert modes.
*/
getMode: function () {
let cm = editors.get(this);
return cm.getOption("mode");
},
/**
* Changes the value of a currently used highlighting mode.
* See Editor.modes for the list of all suppoert modes.
*/
setMode: function (value) {
let cm = editors.get(this);
cm.setOption("mode", value);
},
/**
* Returns text from the text area. If line argument is provided
* the method returns only that line.
*/
getText: function (line) {
let cm = editors.get(this);
if (line == null)
return cm.getValue();
let info = cm.lineInfo(line);
return info ? cm.lineInfo(line).text : "";
},
/**
* Replaces whatever is in the text area with the contents of
* the 'value' argument.
*/
setText: function (value) {
let cm = editors.get(this);
cm.setValue(value);
},
/**
* Replaces contents of a text area within the from/to {line, ch}
* range. If neither from nor to arguments are provided works
* exactly like setText. If only from object is provided, inserts
* text at that point, *overwriting* as many characters as needed.
*/
replaceText: function (value, from, to) {
let cm = editors.get(this);
if (!from)
return void this.setText(value);
if (!to) {
let text = cm.getRange({ line: 0, ch: 0 }, from);
return void this.setText(text + value);
}
cm.replaceRange(value, from, to);
},
/**
* Inserts text at the specified {line, ch} position, shifting existing
* contents as necessary.
*/
insertText: function (value, at) {
let cm = editors.get(this);
cm.replaceRange(value, at, at);
},
/**
* Deselects contents of the text area.
*/
dropSelection: function () {
if (!this.somethingSelected())
return;
this.setCursor(this.getCursor());
},
/**
* Extends the current selection to the position specified
* by the provided {line, ch} object.
*/
extendSelection: function (pos) {
let cm = editors.get(this);
let cursor = cm.indexFromPos(cm.getCursor());
let anchor = cm.posFromIndex(cursor + pos.start);
let head = cm.posFromIndex(cursor + pos.start + pos.length);
cm.setSelection(anchor, head);
},
/**
* Gets the first visible line number in the editor.
*/
getFirstVisibleLine: function () {
let cm = editors.get(this);
return cm.lineAtHeight(0, "local");
},
/**
* Scrolls the view such that the given line number is the first visible line.
*/
setFirstVisibleLine: function (line) {
let cm = editors.get(this);
let { top } = cm.charCoords({line: line, ch: 0}, "local");
cm.scrollTo(0, top);
},
/**
* Sets the cursor to the specified {line, ch} position with an additional
* option to align the line at the "top", "center" or "bottom" of the editor
* with "top" being default value.
*/
setCursor: function ({line, ch}, align) {
let cm = editors.get(this);
this.alignLine(line, align);
cm.setCursor({line: line, ch: ch});
},
/**
* Aligns the provided line to either "top", "center" or "bottom" of the
* editor view with a maximum margin of MAX_VERTICAL_OFFSET lines from top or
* bottom.
*/
alignLine: function(line, align) {
let cm = editors.get(this);
let from = cm.lineAtHeight(0, "page");
let to = cm.lineAtHeight(cm.getWrapperElement().clientHeight, "page");
let linesVisible = to - from;
let halfVisible = Math.round(linesVisible/2);
// If the target line is in view, skip the vertical alignment part.
if (line <= to && line >= from) {
return;
}
// Setting the offset so that the line always falls in the upper half
// of visible lines (lower half for bottom aligned).
// MAX_VERTICAL_OFFSET is the maximum allowed value.
let offset = Math.min(halfVisible, MAX_VERTICAL_OFFSET);
let topLine = {
"center": Math.max(line - halfVisible, 0),
"bottom": Math.max(line - linesVisible + offset, 0),
"top": Math.max(line - offset, 0)
}[align || "top"] || offset;
// Bringing down the topLine to total lines in the editor if exceeding.
topLine = Math.min(topLine, this.lineCount());
this.setFirstVisibleLine(topLine);
},
/**
* Returns whether a marker of a specified class exists in a line's gutter.
*/
hasMarker: function (line, gutterName, markerClass) {
let cm = editors.get(this);
let info = cm.lineInfo(line);
if (!info)
return false;
let gutterMarkers = info.gutterMarkers;
if (!gutterMarkers)
return false;
let marker = gutterMarkers[gutterName];
if (!marker)
return false;
return marker.classList.contains(markerClass);
},
/**
* Adds a marker with a specified class to a line's gutter. If another marker
* exists on that line, the new marker class is added to its class list.
*/
addMarker: function (line, gutterName, markerClass) {
let cm = editors.get(this);
let info = cm.lineInfo(line);
if (!info)
return;
let gutterMarkers = info.gutterMarkers;
if (gutterMarkers) {
let marker = gutterMarkers[gutterName];
if (marker) {
marker.classList.add(markerClass);
return;
}
}
let marker = cm.getWrapperElement().ownerDocument.createElement("div");
marker.className = markerClass;
cm.setGutterMarker(info.line, gutterName, marker);
},
/**
* The reverse of addMarker. Removes a marker of a specified class from a
* line's gutter.
*/
removeMarker: function (line, gutterName, markerClass) {
if (!this.hasMarker(line, gutterName, markerClass))
return;
let cm = editors.get(this);
cm.lineInfo(line).gutterMarkers[gutterName].classList.remove(markerClass);
},
/**
* Remove all gutter markers in the gutter with the given name.
*/
removeAllMarkers: function (gutterName) {
let cm = editors.get(this);
cm.clearGutter(gutterName);
},
/**
* Handles attaching a set of events listeners on a marker. They should
* be passed as an object literal with keys as event names and values as
* function listeners. The line number, marker node and optional data
* will be passed as arguments to the function listener.
*
* You don't need to worry about removing these event listeners.
* They're automatically orphaned when clearing markers.
*/
setMarkerListeners: function(line, gutterName, markerClass, events, data) {
if (!this.hasMarker(line, gutterName, markerClass))
return;
let cm = editors.get(this);
let marker = cm.lineInfo(line).gutterMarkers[gutterName];
for (let name in events) {
let listener = events[name].bind(this, line, marker, data);
marker.addEventListener(name, listener);
}
},
/**
* Returns whether a line is decorated using the specified class name.
*/
hasLineClass: function (line, className) {
let cm = editors.get(this);
let info = cm.lineInfo(line);
if (!info)
return false;
return info.wrapClass == className;
},
/**
* Set a CSS class name for the given line, including the text and gutter.
*/
addLineClass: function (line, className) {
let cm = editors.get(this);
cm.addLineClass(line, "wrap", className);
},
/**
* The reverse of addLineClass.
*/
removeLineClass: function (line, className) {
let cm = editors.get(this);
cm.removeLineClass(line, "wrap", className);
},
/**
* Calculates and returns one or more {line, ch} objects for
* a zero-based index who's value is relative to the start of
* the editor's text.
*
* If only one argument is given, this method returns a single
* {line,ch} object. Otherwise it returns an array.
*/
getPosition: function (...args) {
let cm = editors.get(this);
let res = args.map((ind) => cm.posFromIndex(ind));
return args.length === 1 ? res[0] : res;
},
/**
* The reverse of getPosition. Similarly to getPosition this
* method returns a single value if only one argument was given
* and an array otherwise.
*/
getOffset: function (...args) {
let cm = editors.get(this);
let res = args.map((pos) => cm.indexFromPos(pos));
return args.length > 1 ? res : res[0];
},
/**
* Returns a {line, ch} object that corresponds to the
* left, top coordinates.
*/
getPositionFromCoords: function (left, top) {
let cm = editors.get(this);
return cm.coordsChar({ left: left, top: top });
},
/**
* Returns true if there's something to undo and false otherwise.
*/
canUndo: function () {
let cm = editors.get(this);
return cm.historySize().undo > 0;
},
/**
* Returns true if there's something to redo and false otherwise.
*/
canRedo: function () {
let cm = editors.get(this);
return cm.historySize().redo > 0;
},
/**
* Marks the contents as clean and returns the current
* version number.
*/
setClean: function () {
let cm = editors.get(this);
this.version = cm.changeGeneration();
return this.version;
},
/**
* Returns true if contents of the text area are
* clean i.e. no changes were made since the last version.
*/
isClean: function () {
let cm = editors.get(this);
return cm.isClean(this.version);
},
/**
* True if the editor is in the read-only mode, false otherwise.
*/
isReadOnly: function () {
let cm = editors.get(this);
return cm.getOption("readOnly");
},
/**
* Displays a context menu at the point x:y. The first
* argument, container, should be a DOM node that contains
* a context menu element specified by the ID from
* config.contextMenu.
*/
showContextMenu: function (container, x, y) {
if (this.config.contextMenu == null)
return;
let popup = container.getElementById(this.config.contextMenu);
popup.openPopupAtScreen(x, y, true);
},
/**
* This method opens an in-editor dialog asking for a line to
* jump to. Once given, it changes cursor to that line.
*/
jumpToLine: function () {
this.openDialog(CM_JUMP_DIALOG, (line) =>
this.setCursor({ line: line - 1, ch: 0 }));
},
/**
* Extends an instance of the Editor object with additional
* functions. Each function will be called with context as
* the first argument. Context is a {ed, cm} object where
* 'ed' is an instance of the Editor object and 'cm' is an
* instance of the CodeMirror object. Example:
*
* function hello(ctx, name) {
* let { cm, ed } = ctx;
* cm; // CodeMirror instance
* ed; // Editor instance
* name; // 'Mozilla'
* }
*
* editor.extend({ hello: hello });
* editor.hello('Mozilla');
*/
extend: function (funcs) {
Object.keys(funcs).forEach((name) => {
let cm = editors.get(this);
let ctx = { ed: this, cm: cm };
if (name === "initialize")
return void funcs[name](ctx);
this[name] = funcs[name].bind(null, ctx);
});
},
destroy: function () {
this.container = null;
this.config = null;
this.version = null;
this.emit("destroy");
}
};
// Since Editor is a thin layer over CodeMirror some methods
// are mapped directly—without any changes.
CM_MAPPING.forEach(function (name) {
Editor.prototype[name] = function (...args) {
let cm = editors.get(this);
return cm[name].apply(cm, args);
};
});
// Since Gecko already provide complete and up to date list of CSS property
// names, values and color names, we compute them so that they can replace
// the ones used in CodeMirror while initiating an editor object. This is done
// here instead of the file codemirror/css.js so as to leave that file untouched
// and easily upgradable.
function getCSSKeywords() {
function keySet(array) {
var keys = {};
for (var i = 0; i < array.length; ++i) {
keys[array[i]] = true;
}
return keys;
}
let domUtils = Cc["@mozilla.org/inspector/dom-utils;1"]
.getService(Ci.inIDOMUtils);
let cssProperties = domUtils.getCSSPropertyNames(domUtils.INCLUDE_ALIASES);
let cssColors = {};
let cssValues = {};
cssProperties.forEach(property => {
if (property.contains("color")) {
domUtils.getCSSValuesForProperty(property).forEach(value => {
cssColors[value] = true;
});
}
else {
domUtils.getCSSValuesForProperty(property).forEach(value => {
cssValues[value] = true;
});
}
});
return {
cssProperties: keySet(cssProperties),
cssValues: cssValues,
cssColors: cssColors
};
}
/**
* Returns a controller object that can be used for
* editor-specific commands such as find, jump to line,
* copy/paste, etc.
*/
function controller(ed) {
return {
supportsCommand: function (cmd) {
switch (cmd) {
case "cmd_find":
case "cmd_findAgain":
case "cmd_findPrevious":
case "cmd_gotoLine":
case "cmd_undo":
case "cmd_redo":
case "cmd_delete":
case "cmd_selectAll":
return true;
}
return false;
},
isCommandEnabled: function (cmd) {
let cm = editors.get(ed);
switch (cmd) {
case "cmd_find":
case "cmd_gotoLine":
case "cmd_selectAll":
return true;
case "cmd_findAgain":
return cm.state.search != null && cm.state.search.query != null;
case "cmd_undo":
return ed.canUndo();
case "cmd_redo":
return ed.canRedo();
case "cmd_delete":
return ed.somethingSelected();
}
return false;
},
doCommand: function (cmd) {
let cm = editors.get(ed);
let map = {
"cmd_selectAll": "selectAll",
"cmd_find": "find",
"cmd_undo": "undo",
"cmd_redo": "redo",
"cmd_delete": "delCharAfter",
"cmd_findAgain": "findNext"
};
if (map[cmd])
return void cm.execCommand(map[cmd]);
if (cmd == "cmd_gotoLine")
ed.jumpToLine(cm);
},
onEvent: function () {}
};
}
module.exports = Editor;