feat: generate a file that exports only contexts

Author: devanshj

.gitignore

@@ -4,3 +4,4 @@ src/parser/JavaParser.ts
 src/parser/JavaParserListener.ts
 src/parser/JavaParserVisitor.ts
 src/parser/JavaLexer.ts
+src/parser/JavaContexts.ts

generate-contexts.js

@@ -0,0 +1,35 @@
+// @ts-check
+
+const fs = require('fs').promises;
+const path = require('path');
+const { EOL } = require('os');
+
+const listenerFilePath = path.join(__dirname, '/src/parser/JavaParserListener.ts');
+const contextsFilePath = path.join(__dirname, '/src/parser/JavaContexts.ts');
+
+const main = () =>
+  fs
+    .stat(listenerFilePath)
+    .catch(
+      () => 'src/parser/JavaParserListener.ts not found use generate:parser script to generate it',
+    )
+    .then(() => fs.readFile(listenerFilePath, 'utf-8'))
+    .then((listenerSource) =>
+      listenerSource
+        .split(EOL)
+        .map((l) => {
+          let matches = l.match(/import\s*\{\s*(.*Context)\s*\}.*/);
+          if (matches === null) return null;
+          return matches[1];
+        })
+        .filter((c) => c !== null),
+    )
+    .then((contexts) => contexts.reduce((list, context) => list + `  ${context},${EOL}`, ''))
+    .then((exportList) => `export {${EOL}${exportList}} from './JavaParser';`)
+    .then((contextsSource) => fs.writeFile(contextsFilePath, contextsSource));
+
+main().catch((error) => {
+  if (typeof error !== 'string') throw error;
+  console.log('Failure: ' + error);
+  process.exit(1);
+});

package.json

@@ -25,12 +25,14 @@
     "format": "prettier --write src/**.ts **/*.json",
     "prepublish": "yarn build",
     "generate:parser": "antlr4ts -visitor -o src/parser src/parser/JavaLexer.g4 src/parser/JavaParser.g4",
+    "generate:contexts": "node generate-contexts.js",
     "precommit": "lint-staged",
     "postcommit": "git update-index --again",
     "test": "jest"
   },
   "devDependencies": {
     "@types/jest": "^23.1.5",
+    "@types/node": "^14.0.22",
     "antlr4ts-cli": "^0.4.0-alpha.4",
     "husky": "^0.14.3",
     "jest": "^23.3.0",

yarn.lock

@@ -26,6 +26,11 @@
   version "23.1.5"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-23.1.5.tgz#e31be003956e1fa8c860124d99bea9ae327ae37b"
 
+"@types/node@^14.0.22":
+  version "14.0.22"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.0.22.tgz#23ea4d88189cec7d58f9e6b66f786b215eb61bdc"
+  integrity sha512-emeGcJvdiZ4Z3ohbmw93E/64jRzUHAItSHt8nF7M4TGgQTiWqFVGB8KNpLGFmUHmHLvjvBgFwVlqNcq+VuGv9g==
+
 abab@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/abab/-/abab-1.0.4.tgz#5faad9c2c07f60dd76770f71cf025b62a63cfd4e"