feat steps 1 2 and 3

package.json

@@ -4,11 +4,12 @@
   "description": "A minimal SQL based DB based on CSV files. For educational purposes only.",
   "main": "./src/index.js",
   "directories": {
-    "doc": "docs"
+    "doc": "docs",
+    "test": "tests"
   },
   "scripts": {
     "test": "jest",
-    "test:1": "jest --testPathPattern=./tests/step-01",
+   "test:1": "jest --testPathPattern=./tests/step-01",
     "test:2": "jest --testPathPattern=./tests/step-02",
     "test:3": "jest --testPathPattern=./tests/step-03",
     "test:4": "jest --testPathPattern=./tests/step-04",
@@ -38,11 +39,11 @@
   "author": "Chakshu Gautam",
   "license": "ISC",
   "devDependencies": {
+    "csv-parser": "^3.0.0",
     "jest": "^29.7.0"
   },
   "dependencies": {
-    "csv-parser": "^3.0.0",
     "json2csv": "^6.0.0-alpha.2",
     "xterm": "^5.3.0"
   }
-}
+}

sample.csv

@@ -0,0 +1,4 @@
+id,name,age
+1,John,30
+2,Jane,25
+3,Bob,22

src/csvReader.js

@@ -0,0 +1,20 @@
+const fs = require('fs');
+const csv = require('csv-parser');
+
+function readCSV(filePath) {
+    const results = [];
+
+    return new Promise((resolve, reject) => {
+        fs.createReadStream(filePath)
+            .pipe(csv())
+            .on('data', (data) => results.push(data))
+            .on('end', () => {
+                resolve(results);
+            })
+            .on('error', (error) => {
+                reject(error);
+            });
+    });
+}
+
+module.exports = readCSV;

src/queryParser.js

@@ -0,0 +1,18 @@
+function parseQuery(query){
+    const selectRegex = /SELECT (.+) FROM (.+)/i;
+    const match=query.match
+    (selectRegex);
+
+    if(match){
+        const [,fields,table]=match;
+        return{
+            fields:fields.split(',').
+            map(field=>field.trim()),
+            table:table.trim()
+        };
+    }else{
+        throw new Error('Invalid query format');
+    }
+}
+
+module.exports=parseQuery;