angular-cn/aio/tools/transforms/angular-api-package/processors/addMetadataAliases.js

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const CssSelectorParser = require('css-selector-parser').CssSelectorParser;
const cssParser = new CssSelectorParser();
/**
* @dgProcessor addMetadataAliases
*
* Directives and components can also be referenced by their selectors,
* and Pipes can be referenced by their name.
* So let's add each selector as an alias to this doc.
*/
module.exports = function addMetadataAliasesProcessor() {
return {
$runAfter: ['extractDecoratedClassesProcessor'],
$runBefore: ['computing-ids'],
$process: function(docs) {
docs.forEach(doc => {
switch(doc.docType) {
case 'directive':
case 'component': {
const selector = doc[doc.docType + 'Options'].selector;
if (selector) {
doc.aliases = doc.aliases.concat(extractSelectors(selector));
}
break;
}
case 'pipe':
if (doc.pipeOptions.name) {
doc.aliases = doc.aliases.concat(stripQuotes(doc.pipeOptions.name));
}
break;
}
});
}
};
};
function extractSelectors(selectors) {
const selectorAST = cssParser.parse(stripQuotes(selectors));
const rules = selectorAST.selectors ? selectorAST.selectors.map(ruleSet => ruleSet.rule) : [selectorAST.rule];
const aliases = {};
rules.forEach(rule => {
if (rule.tagName) {
aliases[rule.tagName] = true;
}
if (rule.attrs) {
rule.attrs.forEach(attr => aliases[attr.name] = true);
}
});
return Object.keys(aliases);
}
function stripQuotes(value) {
return (typeof(value) === 'string') ? value.trim().replace(/^(['"])(.*)\1$/, '$2') : value;
}