added initial sql parser

Author: ariflogs

package.json

@@ -14,11 +14,11 @@
   },
   "author": "Arif Hossain",
   "license": "MIT",
-  "type": "module",
   "devDependencies": {
     "typescript": "^5.2.2"
   },
   "dependencies": {
     "sql-to-nosql": "^0.0.3"
-  }
+  },
+  "type": "module"
 }

src/index.ts

@@ -1,2 +1,16 @@
-export const greetings = (name: string) =>
-  `Hello ${name}! I can run your sql queries!`;
+import { parseQuery } from "./utils/parser.js";
+
+export const SqlToNoSql = (query: string) => {
+  if (!query) {
+    throw new Error("missing query!");
+  }
+
+  if ([";", "(", ")"].some((char) => query.includes(char))) {
+    throw new Error("Invalid query, your query contains invalid characters!");
+  }
+
+  const q = parseQuery(query);
+  return q;
+};
+
+console.log(SqlToNoSql("SELECT * FROM users"));

src/utils/parser.ts

@@ -0,0 +1,17 @@
+export const parseQuery = (query: string) => {
+  const [command, ...rest] = query.split(" ");
+
+  if (command !== "SELECT") {
+    throw new Error("Only SELECT queries are supported");
+  }
+
+  const fromIndex = rest.findIndex((word) => word === "FROM");
+  if (fromIndex === -1) {
+    throw new Error("Invalid query, missing FROM keyword");
+  }
+
+  const columns = rest.slice(0, fromIndex);
+  const table = rest[fromIndex + 1];
+
+  return { command, table, columns };
+};

tsconfig.json

@@ -1,12 +1,18 @@
 {
   "compilerOptions": {
+    "strict": true,
+    "module": "ES6",
     "esModuleInterop": true,
-    "target": "es6",
+    "target": "es2016",
     "moduleResolution": "node",
     "sourceMap": true,
-    "sourceRoot": "src",
-    "outDir": "dist"
+    "rootDir": "./src",
+    "outDir": "./dist",
+    "baseUrl": "./src",
+    "paths": {
+      "@utils/*": ["src/utils/*"]
+    }
   },
-  "include": ["src/**/*"],
+  "include": ["src"],
   "exclude": ["node_modules", "dist"]
 }