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112 lines
3.4 KiB
JavaScript
112 lines
3.4 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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"use strict";
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// This file might be required from a node script (./bin/update.js), so don't use
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// Chrome API here.
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/**
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* Return the compatibility table from given compatNode and specified terms.
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* For example, if the terms is ["background-color"],
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* this function returns compatNode["background-color"].__compat.
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*
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* @return {Object} compatibility table
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* {
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* description: {String} Description of this compatibility table.
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* mdn_url: {String} Document in the MDN.
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* support: {
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* $browserName: {String} $browserName is such as firefox, firefox_android and so on.
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* [
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* {
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* added: {String}
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* The version this feature was added.
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* removed: {String} Optional.
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* The version this feature was removed. Optional.
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* prefix: {String} Optional.
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* The prefix this feature is needed such as "-moz-".
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* alternative_name: {String} Optional.
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* The alternative name of this feature such as "-moz-osx-font-smoothing" of "font-smooth".
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* notes: {String} Optional.
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* A simple note for this support.
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* },
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* ...
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* ],
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* },
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* status: {
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* experimental: {Boolean} If true, this feature is experimental.
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* standard_track: {Boolean}, If true, this feature is on the standard track.
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* deprecated: {Boolean} If true, this feature is deprecated.
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* }
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* }
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*/
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function getCompatTable(compatNode, terms) {
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let targetNode = getCompatNode(compatNode, terms);
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if (!targetNode) {
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return null;
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}
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if (!targetNode.__compat) {
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for (const field in targetNode) {
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// TODO: We don't have a way to know the context for now.
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// Thus, use first context node as the compat table.
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// e.g. flex_context of align-item
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// https://github.com/mdn/browser-compat-data/blob/master/css/properties/align-items.json#L5
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if (field.endsWith("_context")) {
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targetNode = targetNode[field];
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break;
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}
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}
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}
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return targetNode.__compat;
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}
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/**
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* Return a compatibility node which is target for `terms` parameter from `compatNode`
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* parameter. For example, when check `background-clip: content-box;`, the `terms` will
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* be ["background-clip", "content-box"]. Then, follow the name of terms from the
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* compatNode node, return the target node. Although this function actually do more
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* complex a bit, if it says simply, returns a node of
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* compatNode["background-clip"]["content-box""] .
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*/
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function getCompatNode(compatNode, terms) {
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for (const term of terms) {
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compatNode = getChildCompatNode(compatNode, term);
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if (!compatNode) {
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return null;
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}
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}
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return compatNode;
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}
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function getChildCompatNode(compatNode, term) {
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term = term.toLowerCase();
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let child = null;
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for (const field in compatNode) {
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if (field.toLowerCase() === term) {
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child = compatNode[field];
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break;
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}
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}
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if (!child) {
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return null;
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}
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if (child._aliasOf) {
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// If the node is an alias, returns the node the alias points.
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child = compatNode[child._aliasOf];
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}
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return child;
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}
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module.exports = {
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getCompatNode,
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getCompatTable,
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};
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