New build infra: Build for Clash (#11)

Build/lib/clash.js

@@ -0,0 +1,34 @@
+// @ts-check
+const _Trie = require('mnemonist/trie');
+const Trie = _Trie.default || _Trie;
+
+const CLASH_SUPPORTED_RULE_TYPE = [
+  'DOMAIN-SUFFIX',
+  'DOMAIN-KEYWORD',
+  'DOMAIN',
+  'SRC-IP-CIDR',
+  'GEOIP',
+  'IP-CIDR',
+  'IP-CIDR6',
+  'DST-PORT',
+  'SRC-PORT'
+];
+
+/**
+ * @param {string[] | Set<string>} rules
+ */
+const surgeRulesetToClashClassicalTextRuleset = (rules) => {
+  const trie = Trie.from(rules);
+  return CLASH_SUPPORTED_RULE_TYPE.map(
+    type => trie.find(`${type},`)
+  ).flat();
+};
+module.exports.surgeRulesetToClashClassicalTextRuleset = surgeRulesetToClashClassicalTextRuleset;
+
+/**
+ * @param {string[]} domainset
+ */
+const surgeDomainsetToClashDomainset = (domainset) => {
+  return domainset.map(i => (i[0] === '.' ? `+${i}` : i));
+};
+module.exports.surgeDomainsetToClashDomainset = surgeDomainsetToClashDomainset;