step 7 passed

src/index.js

@@ -4,6 +4,26 @@ const fs = require("fs");
 const parseQuery = require("./queryParser");
 const readCSV = require("./csvReader");
 
+function evaluateCondition(row, clause) {
+  const { field, operator, value } = clause;
+  switch (operator) {
+    case "=":
+      return row[field] === value;
+    case "!=":
+      return row[field] !== value;
+    case ">":
+      return row[field] > value;
+    case "<":
+      return row[field] < value;
+    case ">=":
+      return row[field] >= value;
+    case "<=":
+      return row[field] <= value;
+    default:
+      throw new Error(`Unsupported operator: ${operator}`);
+  }
+}
+
 async function executeSELECTQuery(query) {
   if (!query.trim().toUpperCase().startsWith("SELECT")) {
     throw new Error("Only SELECT queries are supported");
@@ -22,10 +42,7 @@ async function executeSELECTQuery(query) {
   const filteredData =
     whereClauses.length > 0
       ? data.filter((row) =>
-          whereClauses.every((clause) => {
-            // You can expand this to handle different operators
-            return row[clause.field] === clause.value;
-          })
+          whereClauses.every((clause) => evaluateCondition(row, clause))
         )
       : data;
 

src/queryParser.js

@@ -18,10 +18,14 @@ function parseQuery(query) {
 }
 
 function parseWhereClause(whereString) {
-  const conditions = whereString.split(/ AND | OR /i);
-  return conditions.map((condition) => {
-    const [field, operator, value] = condition.split(/\s+/);
-    return { field, operator, value };
+  const conditionRegex = /(.*?)(=|!=|>|<|>=|<=)(.*)/;
+  return whereString.split(/ AND | OR /i).map((conditionString) => {
+    const match = conditionString.match(conditionRegex);
+    if (match) {
+      const [, field, operator, value] = match;
+      return { field: field.trim(), operator, value: value.trim() };
+    }
+    throw new Error("Invalid WHERE clause format");
   });
 }