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/* 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 EXPORTED_SYMBOLS = ["StyleSheetEditor"];
const { require } = ChromeUtils.import("resource://devtools/shared/Loader.jsm");
const Editor = require("devtools/client/shared/sourceeditor/editor");
const promise = require("promise");
const {
shortSource,
prettifyCSS,
} = require("devtools/shared/inspector/css-logic");
const { throttle } = require("devtools/shared/throttle");
const Services = require("Services");
const EventEmitter = require("devtools/shared/event-emitter");
const { FileUtils } = require("resource://gre/modules/FileUtils.jsm");
const { NetUtil } = require("resource://gre/modules/NetUtil.jsm");
const { OS } = ChromeUtils.import("resource://gre/modules/osfile.jsm");
const {
getString,
showFilePicker,
const LOAD_ERROR = "error-load";
const SAVE_ERROR = "error-save";
// max update frequency in ms (avoid potential typing lag and/or flicker)
// @see StyleEditor.updateStylesheet
const UPDATE_STYLESHEET_DELAY = 500;
// Pref which decides if CSS autocompletion is enabled in Style Editor or not.
const AUTOCOMPLETION_PREF = "devtools.styleeditor.autocompletion-enabled";
// Pref which decides whether updates to the stylesheet use transitions
const TRANSITION_PREF = "devtools.styleeditor.transitions";
// How long to wait to update linked CSS file after original source was saved
// to disk. Time in ms.
const CHECK_LINKED_SHEET_DELAY = 500;
// How many times to check for linked file changes
const MAX_CHECK_COUNT = 10;
// How much time should the mouse be still before the selector at that position
// gets highlighted?
const SELECTOR_HIGHLIGHT_TIMEOUT = 500;
// Minimum delay between firing two media-rules-changed events.
const EMIT_MEDIA_RULES_THROTTLING = 500;
const STYLE_SHEET_UPDATE_CAUSED_BY_STYLE_EDITOR = "styleeditor";
/**
* StyleSheetEditor controls the editor linked to a particular StyleSheet
* object.
*
* Emits events:
* 'property-change': A property on the underlying stylesheet has changed
* 'source-editor-load': The source editor for this editor has been loaded
* 'error': An error has occured
*
* @param {Resource} resource
* The STYLESHEET resource which is received from resource command.
* @param {DOMWindow} win
* panel window for style editor
* @param {Walker} walker
* Optional walker used for selectors autocompletion
* @param {CustomHighlighterFront} highlighter
* Optional highlighter front for the SelectorHighligher used to
* highlight selectors
* @param {Number} styleSheetFriendlyIndex
* Optional Integer representing the index of the current stylesheet
* among all stylesheets of its type (inline or user-created)
*/
function StyleSheetEditor(
resource,
win,
walker,
highlighter,
styleSheetFriendlyIndex
) {
EventEmitter.decorate(this);
this._resource = resource;
this._inputElement = null;
this.sourceEditor = null;
this._window = win;
this._isNew = this.styleSheet.isNew;
this.walker = walker;
this.highlighter = highlighter;
this.styleSheetFriendlyIndex = styleSheetFriendlyIndex;
// True when we've called update() on the style sheet.
// @backward-compat { version 86 } Starting 86, onStyleApplied will be able to know
// if the style was applied because of a change in the StyleEditor (via the `event.cause`
// property inside the resource update). `this._isUpdating` can be dropped when 86
// reaches release.
this._isUpdating = false;
// True when we've just set the editor text based on a style-applied
// event from the StyleSheetActor.
this._justSetText = false;
// state to use when inputElement attaches
this._state = {
text: "",
selection: {
start: { line: 0, ch: 0 },
end: { line: 0, ch: 0 },
},
};
this._styleSheetFilePath = null;
if (
this.styleSheet.href &&
Services.io.extractScheme(this.styleSheet.href) == "file"
) {
this._styleSheetFilePath = this.styleSheet.href;
}
this.onPropertyChange = this.onPropertyChange.bind(this);
this.onMediaRulesChanged = this.onMediaRulesChanged.bind(this);
this.checkLinkedFileForChanges = this.checkLinkedFileForChanges.bind(this);
this.markLinkedFileBroken = this.markLinkedFileBroken.bind(this);
this.saveToFile = this.saveToFile.bind(this);
this.updateStyleSheet = this.updateStyleSheet.bind(this);
this._updateStyleSheet = this._updateStyleSheet.bind(this);
this._onMouseMove = this._onMouseMove.bind(this);
this._focusOnSourceEditorReady = false;
this.savedFile = this.styleSheet.file;
this.linkCSSFile();
this.emitMediaRulesChanged = throttle(
this.emitMediaRulesChanged,
EMIT_MEDIA_RULES_THROTTLING,
this
);
this.mediaRules = [];
}
StyleSheetEditor.prototype = {
get resourceId() {
return this._resource.resourceId;
},
get styleSheet() {
return this._resource;
},
/**
* Whether there are unsaved changes in the editor
*/
get unsaved() {
return this.sourceEditor && !this.sourceEditor.isClean();
},
/**
* Whether the editor is for a stylesheet created by the user
* through the style editor UI.
*/
get isNew() {
return this._isNew;
},
/**
* The style sheet or the generated style sheet for this source if it's an
* original source.
*/
get cssSheet() {
if (this.styleSheet.isOriginalSource) {
return this.styleSheet.relatedStyleSheet;
}
return this.styleSheet;
},
get savedFile() {
return this._savedFile;
},
set savedFile(name) {
this._savedFile = name;
this.linkCSSFile();
},
/**
* Get a user-friendly name for the style sheet.
*
* @return string
*/
get friendlyName() {
if (this.savedFile) {
return this.savedFile.leafName;
}
if (this._isNew) {
const index = this.styleSheetFriendlyIndex + 1 || 0;
return getString("newStyleSheet", index);
}
if (!this.styleSheet.href) {
const index = this.styleSheetFriendlyIndex + 1 || 0;
return getString("inlineStyleSheet", index);
}
if (!this._friendlyName) {
const sheetURI = this.styleSheet.href;
this._friendlyName = shortSource({ href: sheetURI });
try {
this._friendlyName = decodeURI(this._friendlyName);
} catch (ex) {
// Ignore.
}
}
return this._friendlyName;
},
/**
* Check if transitions are enabled for style changes.
*
* @return Boolean
*/
get transitionsEnabled() {
return Services.prefs.getBoolPref(TRANSITION_PREF);
},
/**
* If this is an original source, get the path of the CSS file it generated.
*/
linkCSSFile: function() {
if (!this.styleSheet.isOriginalSource) {
return;
}
const relatedSheet = this.styleSheet.relatedStyleSheet;
if (!relatedSheet || !relatedSheet.href) {
return;
}
let path;
const href = removeQuery(relatedSheet.href);
const uri = NetUtil.newURI(href);
if (uri.scheme == "file") {
const file = uri.QueryInterface(Ci.nsIFileURL).file;
path = file.path;
} else if (this.savedFile) {
const origHref = removeQuery(this.styleSheet.href);
const origUri = NetUtil.newURI(origHref);
path = findLinkedFilePath(uri, origUri, this.savedFile);
} else {
// we can't determine path to generated file on disk
return;
}
if (this.linkedCSSFile == path) {
return;
}
this.linkedCSSFile = path;
this.linkedCSSFileError = null;
// save last file change time so we can compare when we check for changes.
OS.File.stat(path).then(info => {
this._fileModDate = info.lastModificationDate.getTime();
}, this.markLinkedFileBroken);
this.emit("linked-css-file");
},
/**
* A helper function that fetches the source text from the style
* sheet. The text is possibly prettified using prettifyCSS. This
* also sets |this._state.text| to the new text.
*
* @return {Promise} a promise that resolves to the new text
*/
async _getSourceTextAndPrettify() {
const styleSheetsFront = await this._getStyleSheetsFront();
let longStr = null;
if (this.styleSheet.isOriginalSource) {
// If the stylesheet is OriginalSource, we should get the texts from SourceMapService.
// So, for now, we use OriginalSource.getText() as it is.
longStr = await this.styleSheet.getText();
} else {
longStr = await styleSheetsFront.getText(this.resourceId);
}
let source = await longStr.string();
const ruleCount = this.styleSheet.ruleCount;
if (!this.styleSheet.isOriginalSource) {
const { result, mappings } = prettifyCSS(source, ruleCount);
source = result;
// Store the list of objects with mappings between CSS token positions from the
// original source to the prettified source. These will be used when requested to
// jump to a specific position within the editor.
this._mappings = mappings;
}
this._state.text = source;
return source;
},
/**
* Start fetching the full text source for this editor's sheet.
*
* @return {Promise}
* A promise that'll resolve with the source text once the source
* has been loaded or reject on unexpected error.
*/
fetchSource: function() {
return this._getSourceTextAndPrettify()
.then(source => {
this.sourceLoaded = true;
return source;
})
.catch(e => {
if (this._isDestroyed) {
console.warn(
"Could not fetch the source for " +
this.styleSheet.href +
", the editor was destroyed"
);
console.error(e);
} else {
console.error(e);
this.emit("error", {
key: LOAD_ERROR,
append: this.styleSheet.href,
level: "warning",
});
throw e;
}
});
},
/**
* Set the cursor at the given line and column location within the code editor.
*
* @param {Number} line
* @param {Number} column
*/
setCursor(line, column) {
const position = this.translateCursorPosition(line, column);
this.sourceEditor.setCursor({ line: position.line, ch: position.column });
},
/**
* If the stylesheet was automatically prettified, there should be a list of line
* and column mappings from the original to the generated source that can be used
* to translate the cursor position to the correct location in the prettified source.
* If no mappings exist, return the original cursor position unchanged.
*
* @param {Number} line
* @param {Numer} column
*
* @return {Object}
*/
translateCursorPosition(line, column) {
if (Array.isArray(this._mappings)) {
for (const mapping of this._mappings) {
if (
mapping.original.line === line &&
mapping.original.column === column
) {
line = mapping.generated.line;
column = mapping.generated.column;
continue;
}
}
}
return { line, column };
},
/**
* Forward property-change event from stylesheet.
*
* @param {string} event
* Event type
* @param {string} property
* Property that has changed on sheet
*/
onPropertyChange: function(property, value) {
this.emit("property-change", property, value);
},
/**
* Called when the stylesheet text changes.
* @param {Object} update: The stylesheet resource update packet.
*/
onStyleApplied: function(update) {
const updateIsFromSyleSheetEditor =
update?.event?.cause === STYLE_SHEET_UPDATE_CAUSED_BY_STYLE_EDITOR;
// @backward-compat { version 86 } this._isUpdating can be removed.
// See property declaration for more information.
if (this._isUpdating || updateIsFromSyleSheetEditor) {
// We just applied an edit in the editor, so we can drop this
// notification.
// @backward-compat { version 86 } this._isUpdating can be removed.
this._isUpdating = false;
this.emit("style-applied");
return;
}
if (this.sourceEditor) {
this._getSourceTextAndPrettify().then(newText => {
this._justSetText = true;
const firstLine = this.sourceEditor.getFirstVisibleLine();
const pos = this.sourceEditor.getCursor();
this.sourceEditor.setText(newText);
this.sourceEditor.setFirstVisibleLine(firstLine);
this.sourceEditor.setCursor(pos);
this.emit("style-applied");
});
}
},
/**
* Handles changes to the list of @media rules in the stylesheet.
* Emits 'media-rules-changed' if the list has changed.
*
* @param {array} rules
* Array of MediaRuleFronts for new media rules of sheet.
*/
onMediaRulesChanged: function(rules) {
if (!rules.length && !this.mediaRules.length) {
return;
}
this.mediaRules = rules;
this.emitMediaRulesChanged();
},
/**
* Forward media-rules-changed event from stylesheet.
*/
emitMediaRulesChanged: function() {
this.emit("media-rules-changed", this.mediaRules);
},
/**
* Create source editor and load state into it.
* @param {DOMElement} inputElement
* Element to load source editor in
* @param {CssProperties} cssProperties
* A css properties database.
*
* @return {Promise}
* Promise that will resolve when the style editor is loaded.
*/
load: function(inputElement, cssProperties) {
if (this._isDestroyed) {
return promise.reject(
"Won't load source editor as the style sheet has " +
"already been removed from Style Editor."
);
}
this._inputElement = inputElement;
const config = {
value: this._state.text,
lineNumbers: true,
mode: Editor.modes.css,
readOnly: false,
autoCloseBrackets: "{}()",
extraKeys: this._getKeyBindings(),
contextMenu: "sourceEditorContextMenu",
autocomplete: Services.prefs.getBoolPref(AUTOCOMPLETION_PREF),
autocompleteOpts: { walker: this.walker, cssProperties },
cssProperties,
};
const sourceEditor = (this._sourceEditor = new Editor(config));
sourceEditor.on("dirty-change", this.onPropertyChange);
return sourceEditor.appendTo(inputElement).then(() => {
sourceEditor.on("saveRequested", this.saveToFile);
if (!this.styleSheet.isOriginalSource) {
sourceEditor.on("change", this.updateStyleSheet);
}
this.sourceEditor = sourceEditor;
if (this._focusOnSourceEditorReady) {
this._focusOnSourceEditorReady = false;
sourceEditor.focus();
}
sourceEditor.setSelection(
this._state.selection.start,
this._state.selection.end
);
if (
this.highlighter &&
this.walker &&
sourceEditor.container &&
sourceEditor.container.contentWindow
) {
sourceEditor.container.contentWindow.addEventListener(
"mousemove",
this._onMouseMove
);
}
// Add the commands controller for the source-editor.
sourceEditor.insertCommandsController();
this.emit("source-editor-load");
});
},
/**
* Get the source editor for this editor.
*
* @return {Promise}
* Promise that will resolve with the editor.
*/
getSourceEditor: function() {
const self = this;
if (this.sourceEditor) {
return Promise.resolve(this);
}
return new Promise(resolve => {
this.on("source-editor-load", () => {
resolve(self);
});
});
},
/**
* Focus the Style Editor input.
*/
focus: function() {
if (this.sourceEditor) {
this.sourceEditor.focus();
} else {
this._focusOnSourceEditorReady = true;
}
},
/**
* Event handler for when the editor is shown.
*/
onShow: function() {
if (this.sourceEditor) {
// CodeMirror needs refresh to restore scroll position after hiding and
// showing the editor.
this.sourceEditor.refresh();
}
this.focus();
},
/**
* Toggled the disabled state of the underlying stylesheet.
*/
async toggleDisabled() {
const styleSheetsFront = await this._getStyleSheetsFront();
styleSheetsFront.toggleDisabled(this.resourceId).catch(console.error);
},
/**
* Queue a throttled task to update the live style sheet.
*/
updateStyleSheet: function() {
if (this._updateTask) {
// cancel previous queued task not executed within throttle delay
this._window.clearTimeout(this._updateTask);
}
this._updateTask = this._window.setTimeout(
this._updateStyleSheet,
UPDATE_STYLESHEET_DELAY
);
},
/**
* Update live style sheet according to modifications.
*/
async _updateStyleSheet() {
if (this.styleSheet.disabled) {
// TODO: do we want to do this?
return;
}
if (this._justSetText) {
this._justSetText = false;
return;
}
// reset only if we actually perform an update
// (stylesheet is enabled) so that 'missed' updates
// while the stylesheet is disabled can be performed
// when it is enabled back. @see enableStylesheet
this._updateTask = null;
if (this.sourceEditor) {
this._state.text = this.sourceEditor.getText();
}
// @backward-compat { version 86 } See property declaration for more information.
this._isUpdating = true;
try {
const styleSheetsFront = await this._getStyleSheetsFront();
await styleSheetsFront.update(
this.resourceId,
this._state.text,
this.transitionsEnabled,
STYLE_SHEET_UPDATE_CAUSED_BY_STYLE_EDITOR
);
// Clear any existing mappings from automatic CSS prettification
// because they were likely invalided by manually editing the stylesheet.
this._mappings = null;
} catch (e) {
console.error(e);
}
},
/**
* Handle mousemove events, calling _highlightSelectorAt after a delay only
* and reseting the delay everytime.
*/
_onMouseMove: function(e) {
this.highlighter.hide();
if (this.mouseMoveTimeout) {
this._window.clearTimeout(this.mouseMoveTimeout);
this.mouseMoveTimeout = null;
}
this.mouseMoveTimeout = this._window.setTimeout(() => {
this._highlightSelectorAt(e.clientX, e.clientY);
}, SELECTOR_HIGHLIGHT_TIMEOUT);
},
/**
* Highlight nodes matching the selector found at coordinates x,y in the
* editor, if any.
*
* @param {Number} x
* @param {Number} y
*/
async _highlightSelectorAt(x, y) {
const pos = this.sourceEditor.getPositionFromCoords({ left: x, top: y });
const info = this.sourceEditor.getInfoAt(pos);
if (!info || info.state !== "selector") {
return;
}
const node = await this.walker.getStyleSheetOwnerNode(this.resourceId);
await this.highlighter.show(node, {
selector: info.selector,
hideInfoBar: true,
showOnly: "border",
region: "border",
});
this.emit("node-highlighted");
},
/**
* Save the editor contents into a file and set savedFile property.
* A file picker UI will open if file is not set and editor is not headless.
*
* @param mixed file
* Optional nsIFile or string representing the filename to save in the
* background, no UI will be displayed.
* If not specified, the original style sheet URI is used.
* To implement 'Save' instead of 'Save as', you can pass
* savedFile here.
* @param function(nsIFile aFile) callback
* Optional callback called when the operation has finished.
* aFile has the nsIFile object for saved file or null if the operation
* has failed or has been canceled by the user.
* @see savedFile
*/
saveToFile: function(file, callback) {
const onFile = returnFile => {
if (!returnFile) {
if (callback) {
callback(null);
}
return;
}
if (this.sourceEditor) {
this._state.text = this.sourceEditor.getText();
}
const ostream = FileUtils.openSafeFileOutputStream(returnFile);
const converter = Cc[
"@mozilla.org/intl/scriptableunicodeconverter"
].createInstance(Ci.nsIScriptableUnicodeConverter);
converter.charset = "UTF-8";
const istream = converter.convertToInputStream(this._state.text);
NetUtil.asyncCopy(istream, ostream, status => {
if (!Components.isSuccessCode(status)) {
if (callback) {
callback(null);
}
this.emit("error", { key: SAVE_ERROR });
return;
}
FileUtils.closeSafeFileOutputStream(ostream);
this.onFileSaved(returnFile);
if (callback) {
callback(returnFile);
}
});
};
let defaultName;
if (this._friendlyName) {
defaultName = OS.Path.basename(this._friendlyName);
}
showFilePicker(
file || this._styleSheetFilePath,
true,
this._window,
onFile,
defaultName
);
},
/**
* Called when this source has been successfully saved to disk.
*/
onFileSaved: function(returnFile) {
this._friendlyName = null;
this.savedFile = returnFile;
if (this.sourceEditor) {
this.sourceEditor.setClean();
}
this.emit("property-change");
// TODO: replace with file watching
this._modCheckCount = 0;
this._window.clearTimeout(this._timeout);
if (this.linkedCSSFile && !this.linkedCSSFileError) {
this._timeout = this._window.setTimeout(
this.checkLinkedFileForChanges,
CHECK_LINKED_SHEET_DELAY
);
}
},
/**
* Check to see if our linked CSS file has changed on disk, and
* if so, update the live style sheet.
*/
checkLinkedFileForChanges: function() {
OS.File.stat(this.linkedCSSFile).then(info => {
const lastChange = info.lastModificationDate.getTime();
if (this._fileModDate && lastChange != this._fileModDate) {
this._fileModDate = lastChange;
this._modCheckCount = 0;
this.updateLinkedStyleSheet();
return;
}
if (++this._modCheckCount > MAX_CHECK_COUNT) {
this.updateLinkedStyleSheet();
return;
}
// try again in a bit
this._timeout = this._window.setTimeout(
this.checkLinkedFileForChanges,
CHECK_LINKED_SHEET_DELAY
);
}, this.markLinkedFileBroken);
},
/**
* Notify that the linked CSS file (if this is an original source)
* doesn't exist on disk in the place we think it does.
*
* @param string error
* The error we got when trying to access the file.
*/
markLinkedFileBroken: function(error) {
this.linkedCSSFileError = error || true;
this.emit("linked-css-file-error");
error +=
" querying " +
this.linkedCSSFile +
" original source location: " +
this.savedFile.path;
console.error(error);
},
/**
* For original sources (e.g. Sass files). Fetch contents of linked CSS
* file from disk and live update the stylesheet object with the contents.
*/
updateLinkedStyleSheet: function() {
OS.File.read(this.linkedCSSFile).then(async array => {
const decoder = new TextDecoder();
const text = decoder.decode(array);
// Ensure we don't re-fetch the text from the original source
// actor when we're notified that the style sheet changed.
// @backward-compat { version 86 } See property declaration for more information.
this._isUpdating = true;
const styleSheetsFront = await this._getStyleSheetsFront();
await styleSheetsFront.update(
this.resourceId,
text,
this.transitionsEnabled,
STYLE_SHEET_UPDATE_CAUSED_BY_STYLE_EDITOR
);
}, this.markLinkedFileBroken);
},
/**
* Retrieve custom key bindings objects as expected by Editor.
* Editor action names are not displayed to the user.
*
* @return {array} key binding objects for the source editor
*/
_getKeyBindings: function() {
const bindings = {};
const keybind = Editor.accel(getString("saveStyleSheet.commandkey"));
bindings[keybind] = () => {
this.saveToFile(this.savedFile);
};
bindings["Shift-" + keybind] = () => {
this.saveToFile();
};
bindings.Esc = false;
return bindings;
},
_getStyleSheetsFront() {
return this._resource.targetFront.getFront("stylesheets");
},
/**
* Clean up for this editor.
*/
destroy: function() {
if (this._sourceEditor) {
this._sourceEditor.off("dirty-change", this.onPropertyChange);
this._sourceEditor.off("saveRequested", this.saveToFile);
this._sourceEditor.off("change", this.updateStyleSheet);
if (
this.highlighter &&
this.walker &&
this._sourceEditor.container &&
this._sourceEditor.container.contentWindow
) {
this._sourceEditor.container.contentWindow.removeEventListener(
"mousemove",
this._onMouseMove
);
}
this._sourceEditor.destroy();
}
this._isDestroyed = true;
},
};
/**
* Find a path on disk for a file given it's hosted uri, the uri of the
* original resource that generated it (e.g. Sass file), and the location of the
* local file for that source.
*
* @param {nsIURI} uri
* The uri of the resource
* @param {nsIURI} origUri
* The uri of the original source for the resource
* @param {nsIFile} file
* The local file for the resource on disk
*
* @return {string}
* The path of original file on disk
*/
function findLinkedFilePath(uri, origUri, file) {
const { origBranch, branch } = findUnsharedBranches(origUri, uri);
const project = findProjectPath(file, origBranch);
const parts = project.concat(branch);
const path = OS.Path.join.apply(this, parts);
return path;
}
/**
* Find the path of a project given a file in the project and its branch
* off the root. e.g.:
* /Users/moz/proj/src/a.css" and "src/a.css"
* would yield ["Users", "moz", "proj"]
*
* @param {nsIFile} file
* file for that resource on disk
* @param {array} branch
* path parts for branch to chop off file path.
* @return {array}
* array of path parts
*/
function findProjectPath(file, branch) {
const path = OS.Path.split(file.path).components;
for (let i = 2; i <= branch.length; i++) {
// work backwards until we find a differing directory name
if (path[path.length - i] != branch[branch.length - i]) {
return path.slice(0, path.length - i + 1);
}
}
// if we don't find a differing directory, just chop off the branch
return path.slice(0, path.length - branch.length);
}
/**
* Find the parts of a uri past the root it shares with another uri. e.g:
* would yield ["built", "a.scss"] and ["src", "a.css"]
*
* @param {nsIURI} origUri
* uri to find unshared branch of. Usually is uri for original source.
* @param {nsIURI} uri
* uri to compare against to get a shared root
* @return {object}
* object with 'branch' and 'origBranch' array of path parts for branch
*/
function findUnsharedBranches(origUri, uri) {
origUri = OS.Path.split(origUri.pathQueryRef).components;
uri = OS.Path.split(uri.pathQueryRef).components;
for (let i = 0; i < uri.length - 1; i++) {
if (uri[i] != origUri[i]) {
return {
branch: uri.slice(i),
origBranch: origUri.slice(i),
};
}
}
return {
branch: uri,
origBranch: origUri,
};
}
/**
* Remove the query string from a url.
*
* @param {string} href
* Url to remove query string from
* @return {string}
* Url without query string
*/
function removeQuery(href) {
return href.replace(/\?.*/, "");
}