perf: runtime function type checking overhead (#62)

<!-- ps-id: fd3afb3d-774f-4fe5-8171-afc0c54be315 -->

Author: cawalch

scripts/perf.js

@@ -14,6 +14,11 @@ async function runBenchmarks() {
     time: 1000,
   });
 
+  // Test data for TreeInterpreter benchmarks
+  const simpleData = { foo: { bar: 'baz' } };
+  const arrayData = { items: Array.from({ length: 100 }, (_, i) => ({ id: i, name: `item${i}`, price: i * 10 })) };
+  const nestedData = { level1: { level2: { level3: { level4: { value: 42 } } } } };
+
   // Baseline parsing benchmarks
   bench
     .add('Parser#single_expr', () => {
@@ -44,6 +49,41 @@ async function runBenchmarks() {
     })
     .add('Lexer#function_calls', () => {
       jmespath.compile('sort_by(items, &price).name');
+    })
+    // TreeInterpreter evaluation benchmarks
+    .add('Eval#simple_field', () => {
+      jmespath.search(simpleData, 'foo.bar');
+    })
+    .add('Eval#array_projection', () => {
+      jmespath.search(arrayData, 'items[*].name');
+    })
+    .add('Eval#filter_projection', () => {
+      jmespath.search(arrayData, 'items[?price > `500`].name');
+    })
+    .add('Eval#function_call', () => {
+      jmespath.search(arrayData, 'length(items)');
+    })
+    .add('Eval#nested_access', () => {
+      jmespath.search(nestedData, 'level1.level2.level3.level4.value');
+    })
+    .add('Eval#slice_operation', () => {
+      jmespath.search(arrayData, 'items[10:20]');
+    })
+    // Runtime function call benchmarks
+    .add('Runtime#length_function', () => {
+      jmespath.search(arrayData, 'length(items)');
+    })
+    .add('Runtime#max_function', () => {
+      jmespath.search(arrayData, 'max(items[*].price)');
+    })
+    .add('Runtime#sort_by_function', () => {
+      jmespath.search(arrayData, 'sort_by(items, &price)');
+    })
+    .add('Runtime#map_function', () => {
+      jmespath.search(arrayData, 'map(&name, items)');
+    })
+    .add('Runtime#contains_function', () => {
+      jmespath.search(arrayData, 'contains(items[*].name, `"item50"`)');
     });
 
   await bench.run();

src/Runtime.ts

@@ -201,26 +201,28 @@ export class Runtime {
     return false;
   }
   private getTypeName(obj: JSONValue | ExpressionNode): InputArgument | undefined {
-    switch (Object.prototype.toString.call(obj)) {
-      case '[object String]':
-        return InputArgument.TYPE_STRING;
-      case '[object Number]':
-        return InputArgument.TYPE_NUMBER;
-      case '[object Array]':
-        return InputArgument.TYPE_ARRAY;
-      case '[object Boolean]':
-        return InputArgument.TYPE_BOOLEAN;
-      case '[object Null]':
-        return InputArgument.TYPE_NULL;
-      case '[object Object]':
-        if ((obj as ObjectDict).expref) {
-          return InputArgument.TYPE_EXPREF;
-        }
-        return InputArgument.TYPE_OBJECT;
-
-      default:
-        return;
+    if (obj === null) {
+      return InputArgument.TYPE_NULL;
+    }
+    if (typeof obj === 'string') {
+      return InputArgument.TYPE_STRING;
+    }
+    if (typeof obj === 'number') {
+      return InputArgument.TYPE_NUMBER;
+    }
+    if (typeof obj === 'boolean') {
+      return InputArgument.TYPE_BOOLEAN;
+    }
+    if (Array.isArray(obj)) {
+      return InputArgument.TYPE_ARRAY;
+    }
+    if (typeof obj === 'object') {
+      if ((obj as ObjectDict).expref) {
+        return InputArgument.TYPE_EXPREF;
+      }
+      return InputArgument.TYPE_OBJECT;
     }
+    return;
   }
 
   createKeyFunction(exprefNode: ExpressionNode, allowedTypes: InputArgument[]): (x: JSONValue) => JSONValue {