Method stringproto_split

builtin_string.go:815–865

(call FunctionCall)

}

func (r *Runtime) stringproto_split(call FunctionCall) Value {
	r.checkObjectCoercible(call.This)
	separatorValue := call.Argument(0)
	limitValue := call.Argument(1)
	if _, ok := separatorValue.(*Object); ok {
		if splitter := toMethod(r.getV(separatorValue, SymSplit)); splitter != nil {
			return splitter(FunctionCall{
				This:      separatorValue,
				Arguments: []Value{call.This, limitValue},
			})
		}
	}
	s := call.This.toString()

	limit := -1
	if limitValue != _undefined {
		limit = int(toUint32(limitValue))
	}

	separatorValue = separatorValue.ToString()

	if limit == 0 {
		return r.newArrayValues(nil)
	}

	if separatorValue == _undefined {
		return r.newArrayValues([]Value{s})
	}

	separator := separatorValue.String()

	str := s.String()
	splitLimit := limit
	if limit > 0 {
		splitLimit = limit + 1
	}

	// TODO handle invalid UTF-16
	split := strings.SplitN(str, separator, splitLimit)

	if limit > 0 && len(split) > limit {
		split = split[:limit]
	}

	valueArray := make([]Value, len(split))
	for index, value := range split {
		valueArray[index] = newStringValue(value)
	}

	return r.newArrayValues(valueArray)
}

func (r *Runtime) stringproto_startsWith(call FunctionCall) Value {
	r.checkObjectCoercible(call.This)