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799 lines
27 KiB
JavaScript
799 lines
27 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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const { Cc, Ci, Cu } = require('chrome');
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const cssTokenizer = require("devtools/sourceeditor/css-tokenizer");
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const promise = Cu.import("resource://gre/modules/Promise.jsm");
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/**
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* Here is what this file (+ ./css-tokenizer.js) do.
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*
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* The main objective here is to provide as much suggestions to the user editing
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* a stylesheet in Style Editor. The possible things that can be suggested are:
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* - CSS property names
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* - CSS property values
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* - CSS Selectors
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* - Some other known CSS keywords
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*
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* Gecko provides a list of both property names and their corresponding values.
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* We take out a list of matching selectors using the Inspector actor's
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* `getSuggestionsForQuery` method. Now the only thing is to parse the CSS being
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* edited by the user, figure out what token or word is being written and last
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* but the most difficult, what is being edited.
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*
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* The file 'css-tokenizer' helps in converting the CSS into meaningful tokens,
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* each having a certain type associated with it. These tokens help us to figure
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* out the currently edited word and to write a CSS state machine to figure out
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* what the user is currently editing. By that, I mean, whether he is editing a
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* selector or a property or a value, or even fine grained information like an
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* id in the selector.
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*
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* The `resolveState` method iterated over the tokens spitted out by the
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* tokenizer, using switch cases, follows a state machine logic and finally
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* figures out these informations:
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* - The state of the CSS at the cursor (one out of CSS_STATES)
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* - The current token that is being edited `cmpleting`
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* - If the state is "selector", the selector state (one of SELECTOR_STATES)
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* - If the state is "selector", the current selector till the cursor
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* - If the state is "value", the corresponding property name
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*
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* In case of "value" and "property" states, we simply use the information
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* provided by Gecko to filter out the possible suggestions.
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* For "selector" state, we request the Inspector actor to query the page DOM
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* and filter out the possible suggestions.
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* For "media" and "keyframes" state, the only possible suggestions for now are
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* "media" and "keyframes" respectively, although "media" can have suggestions
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* like "max-width", "orientation" etc. Similarly "value" state can also have
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* much better logical suggestions if we fine grain identify a sub state just
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* like we do for the "selector" state.
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*/
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// Autocompletion types.
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const CSS_STATES = {
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"null": "null",
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property: "property", // foo { bar|: … }
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value: "value", // foo {bar: baz|}
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selector: "selector", // f| {bar: baz}
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media: "media", // @med| , or , @media scr| { }
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keyframes: "keyframes", // @keyf|
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frame: "frame", // @keyframs foobar { t|
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};
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const SELECTOR_STATES = {
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"null": "null",
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id: "id", // #f|
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class: "class", // #foo.b|
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tag: "tag", // fo|
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pseudo: "pseudo", // foo:|
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attribute: "attribute", // foo[b|
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value: "value", // foo[bar=b|
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};
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const { properties, propertyNames } = getCSSKeywords();
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/**
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* Constructor for the autocompletion object.
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*
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* @param options {Object} An options object containing the following options:
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* - walker {Object} The object used for query selecting from the current
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* target's DOM.
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* - maxEntries {Number} Maximum selectors suggestions to display.
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*/
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function CSSCompleter(options = {}) {
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this.walker = options.walker;
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this.maxEntries = options.maxEntries || 15;
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}
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CSSCompleter.prototype = {
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/**
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* Returns a list of suggestions based on the caret position.
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*
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* @param source {String} String of the source code.
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* @param caret {Object} Cursor location with line and ch properties.
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*
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* @returns [{object}] A sorted list of objects containing the following
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* peroperties:
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* - label {String} Full keyword for the suggestion
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* - preLabel {String} Already entered part of the label
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*/
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complete: function(source, caret) {
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// Getting the context from the caret position.
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if (!this.resolveState(source, caret)) {
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// We couldn't resolve the context, we won't be able to complete.
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return Promise.resolve([]);
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}
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// Properly suggest based on the state.
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switch(this.state) {
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case CSS_STATES.property:
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return this.completeProperties(this.completing);
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case CSS_STATES.value:
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return this.completeValues(this.propertyName, this.completing);
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case CSS_STATES.selector:
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return this.suggestSelectors();
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case CSS_STATES.media:
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case CSS_STATES.keyframes:
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if ("media".startsWith(this.completing)) {
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return Promise.resolve([{
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label: "media",
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preLabel: this.completing
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}]);
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} else if ("keyframes".startsWith(this.completing)) {
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return Promise.resolve([{
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label: "keyrames",
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preLabel: this.completing
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}]);
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}
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}
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return Promise.resolve([]);
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},
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/**
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* Resolves the state of CSS at the cursor location. This method implements a
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* custom written CSS state machine. The various switch statements provide the
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* transition rules for the state. It also finds out various informatino about
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* the nearby CSS like the property name being completed, the complete
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* selector, etc.
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*
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* @param source {String} String of the source code.
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* @param caret {Object} Cursor location with line and ch properties.
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*
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* @returns CSS_STATE
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* One of CSS_STATE enum or null if the state cannot be resolved.
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*/
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resolveState: function(source, {line, ch}) {
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// Function to return the last element of an array
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let peek = arr => arr[arr.length - 1];
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let tokens = cssTokenizer(source, {loc:true});
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let tokIndex = tokens.length - 1;
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if (tokens[tokIndex].loc.end.line < line ||
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(tokens[tokIndex].loc.end.line === line &&
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tokens[tokIndex].loc.end.column < ch)) {
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// If the last token is not an EOF, we didn't tokenize it correctly.
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// This special case is handled in case we couldn't tokenize, but the last
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// token that *could be tokenized* was an identifier.
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return null;
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}
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// Since last token is EOF, the cursor token is last - 1
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tokIndex--;
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// _state can be one of CSS_STATES;
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let _state = CSS_STATES.null;
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let cursor = 0;
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// This will maintain a stack of paired elements like { & }, @m & }, : & ; etc
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let scopeStack = [];
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let token = null;
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let propertyName = null;
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let selector = "";
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let selectorBeforeNot = "";
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let selectorState = SELECTOR_STATES.null;
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while (cursor <= tokIndex && (token = tokens[cursor++])) {
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switch (_state) {
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case CSS_STATES.property:
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// From CSS_STATES.property, we can either go to CSS_STATES.value state
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// when we hit the first ':' or CSS_STATES.selector if "}" is reached.
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switch(token.tokenType) {
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case ":":
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scopeStack.push(":");
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if (tokens[cursor - 2].tokenType != "WHITESPACE")
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propertyName = tokens[cursor - 2].value;
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else
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propertyName = tokens[cursor - 3].value;
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_state = CSS_STATES.value;
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break;
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case "}":
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if (/[{f]/.test(peek(scopeStack))) {
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let popped = scopeStack.pop();
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if (popped == "f") {
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_state = CSS_STATES.frame;
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} else {
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selector = "";
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_state = CSS_STATES.null;
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}
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}
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break;
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}
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break;
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case CSS_STATES.value:
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// From CSS_STATES.value, we can go to one of CSS_STATES.property,
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// CSS_STATES.frame, CSS_STATES.selector and CSS_STATES.null
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switch(token.tokenType) {
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case ";":
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if (/[:]/.test(peek(scopeStack))) {
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scopeStack.pop();
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_state = CSS_STATES.property;
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}
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break;
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case "}":
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if (peek(scopeStack) == ":")
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scopeStack.pop();
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if (/[{f]/.test(peek(scopeStack))) {
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let popped = scopeStack.pop();
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if (popped == "f") {
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_state = CSS_STATES.frame;
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} else {
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selector = "";
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_state = CSS_STATES.null;
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}
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}
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break;
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}
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break;
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case CSS_STATES.selector:
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// From CSS_STATES.selector, we can only go to CSS_STATES.property when
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// we hit "{"
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if (token.tokenType == "{") {
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scopeStack.push("{");
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_state = CSS_STATES.property;
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break;
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}
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switch(selectorState) {
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case SELECTOR_STATES.id:
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case SELECTOR_STATES.class:
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case SELECTOR_STATES.tag:
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switch(token.tokenType) {
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case "HASH":
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selectorState = SELECTOR_STATES.id;
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selector += "#" + token.value;
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break;
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case "DELIM":
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if (token.value == ".") {
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selectorState = SELECTOR_STATES.class;
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selector += ".";
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if (cursor <= tokIndex &&
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tokens[cursor].tokenType == "IDENT") {
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token = tokens[cursor++];
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selector += token.value;
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}
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} else if (token.value == "#") {
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selectorState = SELECTOR_STATES.id;
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selector += "#";
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} else if (/[>~+]/.test(token.value)) {
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selectorState = SELECTOR_STATES.null;
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selector += token.value;
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} else if (token.value == ",") {
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selectorState = SELECTOR_STATES.null;
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selector = "";
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}
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break;
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case ":":
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selectorState = SELECTOR_STATES.pseudo;
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selector += ":";
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if (cursor > tokIndex)
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break;
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token = tokens[cursor++];
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switch(token.tokenType) {
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case "FUNCTION":
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selectorState = SELECTOR_STATES.null;
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selectorBeforeNot = selector;
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selector = "";
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scopeStack.push("(");
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break;
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case "IDENT":
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selector += token.value;
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break;
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}
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break;
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case "[":
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selectorState = SELECTOR_STATES.attribute;
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scopeStack.push("[");
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selector += "[";
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break;
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case ")":
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if (peek(scopeStack) == "(") {
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scopeStack.pop();
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selector = selectorBeforeNot + "not(" + selector + ")";
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selectorState = SELECTOR_STATES.null;
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}
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break;
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case "WHITESPACE":
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selectorState = SELECTOR_STATES.null;
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selector && (selector += " ");
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break;
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}
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break;
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case SELECTOR_STATES.null:
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// From SELECTOR_STATES.null state, we can go to one of
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// SELECTOR_STATES.id, SELECTOR_STATES.class or SELECTOR_STATES.tag
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switch(token.tokenType) {
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case "HASH":
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selectorState = SELECTOR_STATES.id;
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selector += "#" + token.value;
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break;
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case "IDENT":
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selectorState = SELECTOR_STATES.tag;
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selector += token.value;
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break;
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case "DELIM":
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if (token.value == ".") {
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selectorState = SELECTOR_STATES.class;
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selector += ".";
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if (cursor <= tokIndex &&
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tokens[cursor].tokenType == "IDENT") {
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token = tokens[cursor++];
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selector += token.value;
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}
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} else if (token.value == "#") {
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selectorState = SELECTOR_STATES.id;
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selector += "#";
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} else if (token.value == "*") {
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selectorState = SELECTOR_STATES.tag;
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selector += "*";
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} else if (/[>~+]/.test(token.value)) {
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selector += token.value;
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} else if (token.value == ",") {
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selectorState = SELECTOR_STATES.null;
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selector = "";
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}
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break;
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case ":":
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selectorState = SELECTOR_STATES.pseudo;
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selector += ":";
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if (cursor > tokIndex)
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break;
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token = tokens[cursor++];
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switch(token.tokenType) {
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case "FUNCTION":
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selectorState = SELECTOR_STATES.null;
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selectorBeforeNot = selector;
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selector = "";
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scopeStack.push("(");
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break;
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case "IDENT":
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selector += token.value;
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break;
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}
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break;
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case "[":
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selectorState = SELECTOR_STATES.attribute;
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scopeStack.push("[");
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selector += "[";
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break;
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case ")":
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if (peek(scopeStack) == "(") {
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scopeStack.pop();
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selector = selectorBeforeNot + "not(" + selector + ")";
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selectorState = SELECTOR_STATES.null;
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}
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break;
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case "WHITESPACE":
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selector && (selector += " ");
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break;
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}
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break;
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case SELECTOR_STATES.pseudo:
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switch(token.tokenType) {
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case "DELIM":
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if (/[>~+]/.test(token.value)) {
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selectorState = SELECTOR_STATES.null;
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selector += token.value;
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} else if (token.value == ",") {
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selectorState = SELECTOR_STATES.null;
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selector = "";
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}
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break;
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case ":":
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selectorState = SELECTOR_STATES.pseudo;
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selector += ":";
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if (cursor > tokIndex)
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break;
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token = tokens[cursor++];
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switch(token.tokenType) {
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case "FUNCTION":
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selectorState = SELECTOR_STATES.null;
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selectorBeforeNot = selector;
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selector = "";
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scopeStack.push("(");
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break;
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case "IDENT":
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selector += token.value;
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break;
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}
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break;
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case "[":
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selectorState = SELECTOR_STATES.attribute;
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scopeStack.push("[");
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selector += "[";
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break;
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case "WHITESPACE":
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selectorState = SELECTOR_STATES.null;
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selector && (selector += " ");
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break;
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}
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break;
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case SELECTOR_STATES.attribute:
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switch(token.tokenType) {
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case "DELIM":
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if (/[~|^$*]/.test(token.value)) {
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selector += token.value;
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token = tokens[cursor++];
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}
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if(token.value == "=") {
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selectorState = SELECTOR_STATES.value;
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selector += token.value;
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}
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break;
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case "IDENT":
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case "STRING":
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selector += token.value;
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break;
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case "]":
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if (peek(scopeStack) == "[")
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scopeStack.pop();
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selectorState = SELECTOR_STATES.null;
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selector += "]";
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break;
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case "WHITESPACE":
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selector && (selector += " ");
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break;
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}
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break;
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case SELECTOR_STATES.value:
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switch(token.tokenType) {
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case "STRING":
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case "IDENT":
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selector += token.value;
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break;
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case "]":
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if (peek(scopeStack) == "[")
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scopeStack.pop();
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selectorState = SELECTOR_STATES.null;
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selector += "]";
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break;
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case "WHITESPACE":
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selector && (selector += " ");
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break;
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}
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break;
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}
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break;
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case CSS_STATES.null:
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// From CSS_STATES.null state, we can go to either CSS_STATES.media or
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// CSS_STATES.selector.
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switch(token.tokenType) {
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case "HASH":
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selectorState = SELECTOR_STATES.id;
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selector = "#" + token.value;
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_state = CSS_STATES.selector;
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break;
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case "IDENT":
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selectorState = SELECTOR_STATES.tag;
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selector = token.value;
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_state = CSS_STATES.selector;
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break;
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case "DELIM":
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if (token.value == ".") {
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selectorState = SELECTOR_STATES.class;
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selector = ".";
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_state = CSS_STATES.selector;
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if (cursor <= tokIndex &&
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tokens[cursor].tokenType == "IDENT") {
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token = tokens[cursor++];
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selector += token.value;
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}
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} else if (token.value == "#") {
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selectorState = SELECTOR_STATES.id;
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selector = "#";
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_state = CSS_STATES.selector;
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} else if (token.value == "*") {
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selectorState = SELECTOR_STATES.tag;
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selector = "*";
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_state = CSS_STATES.selector;
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}
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break;
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case ":":
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_state = CSS_STATES.selector;
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selectorState = SELECTOR_STATES.pseudo;
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selector += ":";
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if (cursor > tokIndex)
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break;
|
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token = tokens[cursor++];
|
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switch(token.tokenType) {
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case "FUNCTION":
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selectorState = SELECTOR_STATES.null;
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selectorBeforeNot = selector;
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selector = "";
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scopeStack.push("(");
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break;
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case "IDENT":
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selector += token.value;
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break;
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}
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break;
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case "[":
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_state = CSS_STATES.selector;
|
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selectorState = SELECTOR_STATES.attribute;
|
|
scopeStack.push("[");
|
|
selector += "[";
|
|
break;
|
|
|
|
case "AT-KEYWORD":
|
|
_state = token.value.startsWith("m") ? CSS_STATES.media
|
|
: CSS_STATES.keyframes;
|
|
break;
|
|
|
|
case "}":
|
|
if (peek(scopeStack) == "@m")
|
|
scopeStack.pop();
|
|
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CSS_STATES.media:
|
|
// From CSS_STATES.media, we can only go to CSS_STATES.null state when
|
|
// we hit the first '{'
|
|
if (token.tokenType == "{") {
|
|
scopeStack.push("@m");
|
|
_state = CSS_STATES.null;
|
|
}
|
|
break;
|
|
|
|
case CSS_STATES.keyframes:
|
|
// From CSS_STATES.keyframes, we can only go to CSS_STATES.frame state
|
|
// when we hit the first '{'
|
|
if (token.tokenType == "{") {
|
|
scopeStack.push("@k");
|
|
_state = CSS_STATES.frame;
|
|
}
|
|
break;
|
|
|
|
case CSS_STATES.frame:
|
|
// From CSS_STATES.frame, we can either go to CSS_STATES.property state
|
|
// when we hit the first '{' or to CSS_STATES.selector when we hit '}'
|
|
if (token.tokenType == "{") {
|
|
scopeStack.push("f");
|
|
_state = CSS_STATES.property;
|
|
} else if (token.tokenType == "}") {
|
|
if (peek(scopeStack) == "@k")
|
|
scopeStack.pop();
|
|
|
|
_state = CSS_STATES.null;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
this.state = _state;
|
|
if (!token)
|
|
return _state;
|
|
|
|
if (token && token.tokenType != "WHITESPACE") {
|
|
this.completing = ((token.value || token.repr || token.tokenType) + "")
|
|
.slice(0, ch - token.loc.start.column)
|
|
.replace(/^[.#]$/, "");
|
|
} else {
|
|
this.completing = "";
|
|
}
|
|
// Special check for !important; case.
|
|
if (tokens[cursor - 2] && tokens[cursor - 2].value == "!" &&
|
|
this.completing == "important".slice(0, this.completing.length)) {
|
|
this.completing = "!" + this.completing;
|
|
}
|
|
this.propertyName = _state == CSS_STATES.value ? propertyName : null;
|
|
selector = selector.slice(0, selector.length + token.loc.end.column - ch);
|
|
this.selector = _state == CSS_STATES.selector ? selector : null;
|
|
this.selectorState = _state == CSS_STATES.selector ? selectorState : null;
|
|
return _state;
|
|
},
|
|
|
|
/**
|
|
* Queries the DOM Walker actor for suggestions regarding the selector being
|
|
* completed
|
|
*/
|
|
suggestSelectors: function () {
|
|
let walker = this.walker;
|
|
if (!walker)
|
|
return Promise.resolve([]);
|
|
|
|
let query = this.selector;
|
|
// Even though the selector matched atleast one node, there is still
|
|
// possibility of suggestions.
|
|
switch(this.selectorState) {
|
|
case SELECTOR_STATES.null:
|
|
query += "*";
|
|
break;
|
|
|
|
case SELECTOR_STATES.tag:
|
|
query = query.slice(0, query.length - this.completing.length);
|
|
break;
|
|
|
|
case SELECTOR_STATES.id:
|
|
case SELECTOR_STATES.class:
|
|
case SELECTOR_STATES.pseudo:
|
|
if (/^[.:#]$/.test(this.completing)) {
|
|
query = query.slice(0, query.length - this.completing.length);
|
|
this.completing = "";
|
|
} else {
|
|
query = query.slice(0, query.length - this.completing.length - 1);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (/[\s+>~]$/.test(query) &&
|
|
this.selectorState != SELECTOR_STATES.attribute &&
|
|
this.selectorState != SELECTOR_STATES.value) {
|
|
query += "*";
|
|
}
|
|
|
|
// Set the values that this request was supposed to suggest to.
|
|
this._currentQuery = query;
|
|
return walker.getSuggestionsForQuery(query, this.completing, this.selectorState)
|
|
.then(result => this.prepareSelectorResults(result));
|
|
},
|
|
|
|
/**
|
|
* Prepares the selector suggestions returned by the walker actor.
|
|
*/
|
|
prepareSelectorResults: function(result) {
|
|
if (this._currentQuery != result.query)
|
|
return [];
|
|
|
|
result = result.suggestions;
|
|
let query = this.selector;
|
|
let completion = [];
|
|
for (let value of result) {
|
|
switch(this.selectorState) {
|
|
case SELECTOR_STATES.id:
|
|
case SELECTOR_STATES.class:
|
|
case SELECTOR_STATES.pseudo:
|
|
if (/^[.:#]$/.test(this.completing)) {
|
|
value[0] = query.slice(0, query.length - this.completing.length) +
|
|
value[0];
|
|
} else {
|
|
value[0] = query.slice(0, query.length - this.completing.length - 1) +
|
|
value[0];
|
|
}
|
|
break;
|
|
|
|
case SELECTOR_STATES.tag:
|
|
value[0] = query.slice(0, query.length - this.completing.length) +
|
|
value[0];
|
|
break;
|
|
|
|
case SELECTOR_STATES.null:
|
|
value[0] = query + value[0];
|
|
break;
|
|
|
|
default:
|
|
value[0] = query.slice(0, query.length - this.completing.length) +
|
|
value[0];
|
|
}
|
|
completion.push({
|
|
label: value[0],
|
|
preLabel: query,
|
|
score: value[1]
|
|
});
|
|
if (completion.length > this.maxEntries - 1)
|
|
break;
|
|
}
|
|
return completion;
|
|
},
|
|
|
|
/**
|
|
* Returns CSS property name suggestions based on the input.
|
|
*
|
|
* @param startProp {String} Initial part of the property being completed.
|
|
*/
|
|
completeProperties: function(startProp) {
|
|
let finalList = [];
|
|
let length = propertyNames.length;
|
|
let i = 0, count = 0;
|
|
for (; i < length && count < this.maxEntries; i++) {
|
|
if (propertyNames[i].startsWith(startProp)) {
|
|
count++;
|
|
finalList.push({
|
|
preLabel: startProp,
|
|
label: propertyNames[i]
|
|
});
|
|
} else if (propertyNames[i] > startProp) {
|
|
// We have crossed all possible matches alphabetically.
|
|
break;
|
|
}
|
|
}
|
|
return Promise.resolve(finalList);
|
|
},
|
|
|
|
/**
|
|
* Returns CSS value suggestions based on the corresponding property.
|
|
*
|
|
* @param propName {String} The property to which the value being completed
|
|
* belongs.
|
|
* @param startValue {String} Initial part of the value being completed.
|
|
*/
|
|
completeValues: function(propName, startValue) {
|
|
let finalList = [];
|
|
let list = ["!important;", ...(properties[propName] || [])];
|
|
let length = list.length;
|
|
let i = 0, count = 0;
|
|
for (; i < length && count < this.maxEntries; i++) {
|
|
if (list[i].startsWith(startValue)) {
|
|
count++;
|
|
finalList.push({
|
|
preLabel: startValue,
|
|
label: list[i]
|
|
});
|
|
} else if (list[i] > startValue) {
|
|
// We have crossed all possible matches alphabetically.
|
|
break;
|
|
}
|
|
}
|
|
return Promise.resolve(finalList);
|
|
},
|
|
}
|
|
|
|
/**
|
|
* Returns a list of all property names and a map of property name vs possible
|
|
* CSS values provided by the Gecko engine.
|
|
*
|
|
* @return {Object} An object with following properties:
|
|
* - propertyNames {Array} Array of string containing all the possible
|
|
* CSS property names.
|
|
* - properties {Object|Map} A map where key is the property name and
|
|
* value is an array of string containing all the possible
|
|
* CSS values the property can have.
|
|
*/
|
|
function getCSSKeywords() {
|
|
let domUtils = Cc["@mozilla.org/inspector/dom-utils;1"]
|
|
.getService(Ci.inIDOMUtils);
|
|
let props = {};
|
|
let propNames = domUtils.getCSSPropertyNames(domUtils.INCLUDE_ALIASES);
|
|
propNames.forEach(prop => {
|
|
props[prop] = domUtils.getCSSValuesForProperty(prop).sort();
|
|
});
|
|
return {
|
|
properties: props,
|
|
propertyNames: propNames.sort()
|
|
};
|
|
}
|
|
|
|
module.exports = CSSCompleter;
|