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LibJS: Add String.prototype.slice
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3 changed files with 65 additions and 0 deletions
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@ -60,6 +60,7 @@ StringPrototype::StringPrototype()
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put_native_function("concat", concat, 1, attr);
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put_native_function("substring", substring, 2, attr);
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put_native_function("includes", includes, 1, attr);
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put_native_function("slice", slice, 2, attr);
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}
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StringPrototype::~StringPrototype()
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@ -399,4 +400,45 @@ Value StringPrototype::includes(Interpreter& interpreter)
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return Value(substring_search.contains(search_string));
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}
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Value StringPrototype::slice(Interpreter& interpreter)
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{
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auto* string_object = string_object_from(interpreter);
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if (!string_object)
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return {};
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auto& string = string_object->primitive_string().string();
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if (interpreter.argument_count() == 0)
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return js_string(interpreter, string);
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i32 string_length = static_cast<i32>(string.length());
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i32 index_start = interpreter.argument(0).to_i32();
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i32 index_end = string_length;
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auto negative_min_index = -(string_length - 1);
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if (index_start < negative_min_index)
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index_start = 0;
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else if (index_start < 0)
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index_start = string_length + index_start;
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if (interpreter.argument_count() >= 2) {
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index_end = interpreter.argument(1).to_i32();
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if (index_end < negative_min_index)
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return js_string(interpreter, String::empty());
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if (index_end > string_length)
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index_end = string_length;
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else if (index_end < 0)
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index_end = string_length + index_end;
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}
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if (index_start >= index_end)
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return js_string(interpreter, String::empty());
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auto part_length = index_end - index_start;
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auto string_part = string.substring(index_start, part_length);
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return js_string(interpreter, string_part);
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}
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}
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@ -56,6 +56,7 @@ private:
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static Value trim_end(Interpreter&);
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static Value concat(Interpreter&);
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static Value includes(Interpreter&);
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static Value slice(Interpreter&);
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};
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}
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