104 lines
2.9 KiB
JavaScript
104 lines
2.9 KiB
JavaScript
const mdnAtrules = require('mdn-data/css/at-rules.json');
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const mdnProperties = require('mdn-data/css/properties.json');
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const mdnSyntaxes = require('mdn-data/css/syntaxes.json');
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const patch = require('./patch.json');
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const extendSyntax = /^\s*\|\s*/;
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function preprocessAtrules(dict) {
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const result = Object.create(null);
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for (const atruleName in dict) {
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const atrule = dict[atruleName];
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let descriptors = null;
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if (atrule.descriptors) {
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descriptors = Object.create(null);
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for (const descriptor in atrule.descriptors) {
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descriptors[descriptor] = atrule.descriptors[descriptor].syntax;
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}
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}
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result[atruleName.substr(1)] = {
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prelude: atrule.syntax.trim().match(/^@\S+\s+([^;\{]*)/)[1].trim() || null,
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descriptors
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};
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}
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return result;
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}
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function patchDictionary(dict, patchDict) {
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const result = {};
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// copy all syntaxes for an original dict
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for (const key in dict) {
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result[key] = dict[key].syntax || dict[key];
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}
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// apply a patch
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for (const key in patchDict) {
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if (key in dict) {
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if (patchDict[key].syntax) {
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result[key] = extendSyntax.test(patchDict[key].syntax)
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? result[key] + ' ' + patchDict[key].syntax.trim()
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: patchDict[key].syntax;
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} else {
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delete result[key];
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}
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} else {
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if (patchDict[key].syntax) {
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result[key] = patchDict[key].syntax.replace(extendSyntax, '');
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}
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}
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}
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return result;
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}
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function unpackSyntaxes(dict) {
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const result = {};
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for (const key in dict) {
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result[key] = dict[key].syntax;
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}
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return result;
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}
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function patchAtrules(dict, patchDict) {
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const result = {};
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// copy all syntaxes for an original dict
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for (const key in dict) {
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const patchDescriptors = (patchDict[key] && patchDict[key].descriptors) || null;
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result[key] = {
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prelude: key in patchDict && 'prelude' in patchDict[key]
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? patchDict[key].prelude
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: dict[key].prelude || null,
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descriptors: dict[key].descriptors
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? patchDictionary(dict[key].descriptors, patchDescriptors || {})
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: patchDescriptors && unpackSyntaxes(patchDescriptors)
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};
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}
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// apply a patch
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for (const key in patchDict) {
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if (!hasOwnProperty.call(dict, key)) {
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result[key] = {
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prelude: patchDict[key].prelude || null,
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descriptors: patchDict[key].descriptors && unpackSyntaxes(patchDict[key].descriptors)
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};
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}
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}
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return result;
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}
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module.exports = {
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types: patchDictionary(mdnSyntaxes, patch.syntaxes),
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atrules: patchAtrules(preprocessAtrules(mdnAtrules), patch.atrules),
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properties: patchDictionary(mdnProperties, patch.properties)
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};
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