Implement = operator

main_test.go

@@ -303,6 +303,40 @@ func TestLuaMathFunctions(t *testing.T) {
 	}
 }
 
+func TestDirectAssignment(t *testing.T) {
+	fileContents := `
+		<config>
+			<item>
+				<value>100</value>
+			</item>
+		</config>
+	`
+	expected := `
+		<config>
+			<item>
+				<value>0</value>
+			</item>
+		</config>
+	`
+
+	regex := regexp.MustCompile(`(?s)<value>(\d+)</value>`)
+	luaExpr := `=0`
+	luaScript := buildLuaScript(luaExpr)
+
+	t.Logf("Lua script: %s", luaScript) // Log the generated script for debugging
+
+	modifiedContent, err := process(fileContents, regex, luaScript)
+	if err != nil {
+		t.Fatalf("Error processing file: %v", err)
+	}
+
+	normalizedModified := normalizeWhitespace(modifiedContent)
+	normalizedExpected := normalizeWhitespace(expected)
+	if normalizedModified != normalizedExpected {
+		t.Fatalf("Expected modified content to be %q, but got %q", normalizedExpected, normalizedModified)
+	}
+}
+
 // Test with actual files
 func TestProcessingSampleFiles(t *testing.T) {
 	// Read test files