Minor refactor

backend/gulpfile.babel.js

@@ -15,7 +15,7 @@ export function peggy() {
         .pipe(tap(function (file) {
             const filename = path.basename(file.path).split(".")[0] + ".js";
             const raw = fs.readFileSync(file.path, 'utf8');
-            const contents = `const grammars = String.raw\`\n${raw}\n\`;\nexport default grammars;`;
+            const contents = `import * as peggy from 'peggy';\nconst grammars = String.raw\`\n${raw}\n\`;\nlet parser;\nexport default function getParser() { if(!parser) { parser = peggy.generate(grammars); } return parser; }`;
             return newFile(filename, contents)
                 .pipe(gulp.dest(path.dirname(file.path)))
         }));

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;
+}

backend/test/proxy-parsers/loon.spec.js

@@ -1,10 +1,9 @@
 import { expect } from 'chai';
-import * as peggy from 'peggy';
-import loon from '../../src/core/proxy-utils/grammars/loon';
+import getLoonParser from '../../src/core/proxy-utils/peggy/loon';
 import testcases from './testcases';
 import { describe, it } from 'mocha';
 
-const parser = peggy.generate(loon);
+const parser = getLoonParser();
 
 describe('Loon', function() {
     describe('shadowsocks', function() {

backend/test/proxy-parsers/qx.spec.js

@@ -1,12 +1,11 @@
-import * as peggy from 'peggy';
-import qx from '../../src/core/proxy-utils/grammars/qx';
+import getQXParser from '../../src/core/proxy-utils/peggy/qx';
 import { expect } from 'chai';
 import testcases from './testcases';
 import { describe, it } from 'mocha';
 
 
 
-const parser = peggy.generate(qx);
+const parser = getQXParser();
 
 describe('QX', function() {
     describe('shadowsocks', function() {

backend/test/proxy-parsers/surge.spec.js

@@ -1,11 +1,9 @@
-import * as peggy from 'peggy';
-import surge from '../../src/core/proxy-utils/grammars/surge';
+import getSurgeParser from '../../src/core/proxy-utils/peggy/surge';
 import { expect } from 'chai';
 import testcases from './testcases';
 import { describe, it } from 'mocha';
 
-
-const parser = peggy.generate(surge);
+const parser = getSurgeParser();
 
 describe('Surge', function() {
     describe('shadowsocks', function() {