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