浏览代码

LibJS: Add some TypedArray abstractions for querying underlying type

IsUnclampedIntegerElementType and IsBigIntElementType.
Timothy Flynn 4 年之前
父节点
当前提交
4f8f79c5ca
共有 1 个文件被更改,包括 16 次插入0 次删除
  1. 16 0
      Userland/Libraries/LibJS/Runtime/TypedArray.h

+ 16 - 0
Userland/Libraries/LibJS/Runtime/TypedArray.h

@@ -40,6 +40,10 @@ public:
     virtual size_t element_size() const = 0;
     virtual String element_name() const = 0;
 
+    // 25.1.2.6 IsUnclampedIntegerElementType ( type ), https://tc39.es/ecma262/#sec-isunclampedintegerelementtype
+    virtual bool is_unclamped_integer_element_type() const = 0;
+    // 25.1.2.7 IsBigIntElementType ( type ), https://tc39.es/ecma262/#sec-isbigintelementtype
+    virtual bool is_bigint_element_type() const = 0;
     // 25.1.2.10 GetValueFromBuffer ( arrayBuffer, byteIndex, type, isTypedArray, order [ , isLittleEndian ] ), https://tc39.es/ecma262/#sec-getvaluefrombuffer
     virtual Value get_value_from_buffer(size_t byte_index, ArrayBuffer::Order, bool is_little_endian = true) const = 0;
     // 25.1.2.12 SetValueInBuffer ( arrayBuffer, byteIndex, type, value, isTypedArray, order [ , isLittleEndian ] ), https://tc39.es/ecma262/#sec-setvalueinbuffer
@@ -438,6 +442,18 @@ public:
 
     virtual size_t element_size() const override { return sizeof(UnderlyingBufferDataType); };
 
+    bool is_unclamped_integer_element_type() const override
+    {
+        constexpr bool is_unclamped_integer = IsSame<T, i8> || IsSame<T, u8> || IsSame<T, i16> || IsSame<T, u16> || IsSame<T, i32> || IsSame<T, u32>;
+        return is_unclamped_integer;
+    }
+
+    bool is_bigint_element_type() const override
+    {
+        constexpr bool is_bigint = IsSame<T, i64> || IsSame<T, u64>;
+        return is_bigint;
+    }
+
     Value get_value_from_buffer(size_t byte_index, ArrayBuffer::Order order, bool is_little_endian = true) const override { return viewed_array_buffer()->template get_value<T>(byte_index, true, order, is_little_endian); }
     void set_value_in_buffer(size_t byte_index, Value value, ArrayBuffer::Order order, bool is_little_endian = true) override { viewed_array_buffer()->template set_value<T>(byte_index, value, true, order, is_little_endian); }
     Value get_modify_set_value_in_buffer(size_t byte_index, Value value, ReadWriteModifyFunction operation, bool is_little_endian = true) override { return viewed_array_buffer()->template get_modify_set_value<T>(byte_index, value, move(operation), is_little_endian); }