Minor refactor

backend/src/core/proxy-utils/parsers.js

@@ -1,31 +1,7 @@
-import surge from './grammars/surge';
-import loon from './grammars/loon';
+import getSurgeParser from './peggy/surge';
+import getLoonParser from './peggy/loon';
+import getQXParser from './peggy/qx';
 import { Base64 } from 'js-base64';
-import qx from './grammars/qx';
-import * as peggy from 'peggy';
-
-let QXParser, LoonParser, SurgeParser;
-
-function getQXParser() {
-    if (!QXParser) {
-        QXParser = peggy.generate(qx);
-    }
-    return QXParser;
-}
-
-function getLoonParser() {
-    if (!LoonParser) {
-        LoonParser = peggy.generate(loon);
-    }
-    return LoonParser;
-}
-
-function getSurgeParser() {
-    if (!SurgeParser) {
-        SurgeParser = peggy.generate(surge);
-    }
-    return SurgeParser;
-}
 
 // Parse SS URI format (only supports new SIP002, legacy format is depreciated).
 // reference: https://shadowsocks.org/en/spec/SIP002-URI-Scheme.html

backend/src/core/proxy-utils/peggy/loon.js

@@ -1,3 +1,4 @@
+import * as peggy from 'peggy';
 const grammars = String.raw`
 // global initializer
 {{
@@ -169,4 +170,10 @@ _ = [ \r\t]*
 bool = b:("true"/"false") { return b === "true" }
 others = comma [^=,]+ equals [^=,]+
 `;
-export default grammars;
+let parser;
+export default function getParser() {
+    if (!parser) {
+        parser = peggy.generate(grammars);
+    }
+    return parser;
+}

backend/src/core/proxy-utils/peggy/qx.js

@@ -1,3 +1,4 @@
+import * as peggy from 'peggy';
 const grammars = String.raw`
 // global initializer
 {{
@@ -168,4 +169,10 @@ equals = _ "=" _
 _ = [ \r\t]*
 bool = b:("true"/"false") { return b === "true" }
 `;
-export default grammars;
+let parser;
+export default function getParser() {
+    if (!parser) {
+        parser = peggy.generate(grammars);
+    }
+    return parser;
+}

backend/src/core/proxy-utils/peggy/surge.js

@@ -1,3 +1,4 @@
+import * as peggy from 'peggy';
 const grammars = String.raw`
 // global initializer
 {{
@@ -169,4 +170,10 @@ _ = [ \r\t]*
 bool = b:("true"/"false") { return b === "true" }
 others = comma [^=,]+ equals [^=,]+
 `;
-export default grammars;
+let parser;
+export default function getParser() {
+    if (!parser) {
+        parser = peggy.generate(grammars);
+    }
+    return parser;
+}