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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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 {parseDeclarations} = require("devtools/shared/css/parsing-utils");
const promise = require("promise");
const {getCSSLexer} = require("devtools/shared/css/lexer");
const {KeyCodes} = require("devtools/client/shared/keycodes");
const HTML_NS = "http://www.w3.org/1999/xhtml";
/**
* Create a child element with a set of attributes.
*
* @param {Element} parent
* The parent node.
* @param {string} tagName
* The tag name.
* @param {object} attributes
* A set of attributes to set on the node.
*/
function createChild(parent, tagName, attributes = {}) {
let elt = parent.ownerDocument.createElementNS(HTML_NS, tagName);
for (let attr in attributes) {
if (attributes.hasOwnProperty(attr)) {
if (attr === "textContent") {
elt.textContent = attributes[attr];
} else if (attr === "child") {
elt.appendChild(attributes[attr]);
} else {
elt.setAttribute(attr, attributes[attr]);
}
}
}
parent.appendChild(elt);
return elt;
}
exports.createChild = createChild;
/**
* Append a text node to an element.
*
* @param {Element} parent
* The parent node.
* @param {string} text
* The text content for the text node.
*/
function appendText(parent, text) {
parent.appendChild(parent.ownerDocument.createTextNode(text));
}
exports.appendText = appendText;
/**
* Called when a character is typed in a value editor. This decides
* whether to advance or not, first by checking to see if ";" was
* typed, and then by lexing the input and seeing whether the ";"
* would be a terminator at this point.
*
* @param {number} keyCode
* Key code to be checked.
* @param {string} aValue
* Current text editor value.
* @param {number} insertionPoint
* The index of the insertion point.
* @return {Boolean} True if the focus should advance; false if
* the character should be inserted.
*/
function advanceValidate(keyCode, value, insertionPoint) {
// Only ";" has special handling here.
if (keyCode !== KeyCodes.DOM_VK_SEMICOLON) {
return false;
}
// Insert the character provisionally and see what happens. If we
// end up with a ";" symbol token, then the semicolon terminates the
// value. Otherwise it's been inserted in some spot where it has a
// valid meaning, like a comment or string.
value = value.slice(0, insertionPoint) + ";" + value.slice(insertionPoint);
let lexer = getCSSLexer(value);
while (true) {
let token = lexer.nextToken();
if (token.endOffset > insertionPoint) {
if (token.tokenType === "symbol" && token.text === ";") {
// The ";" is a terminator.
return true;
}
// The ";" is not a terminator in this context.
break;
}
}
return false;
}
exports.advanceValidate = advanceValidate;
/**
* Create a throttling function wrapper to regulate its frequency.
*
* @param {Function} func
* The function to throttle
* @param {number} wait
* The throttling period
* @param {Object} scope
* The scope to use for func
* @return {Function} The throttled function
*/
function throttle(func, wait, scope) {
let timer = null;
return function () {
if (timer) {
clearTimeout(timer);
}
let args = arguments;
timer = setTimeout(function () {
timer = null;
func.apply(scope, args);
}, wait);
};
}
exports.throttle = throttle;
/**
* Event handler that causes a blur on the target if the input has
* multiple CSS properties as the value.
*/
function blurOnMultipleProperties(cssProperties) {
return (e) => {
setTimeout(() => {
let props = parseDeclarations(cssProperties.isKnown, e.target.value);
if (props.length > 1) {
e.target.blur();
}
}, 0);
};
}
exports.blurOnMultipleProperties = blurOnMultipleProperties;
/**
* Log the provided error to the console and return a rejected Promise for
* this error.
*
* @param {Error} error
* The error to log
* @return {Promise} A rejected promise
*/
function promiseWarn(error) {
console.error(error);
return promise.reject(error);
}
exports.promiseWarn = promiseWarn;
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