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LibJS: Add String.prototype.repeat() :^)

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This commit is contained in:
Andreas Kling 2020-03-15 21:17:18 +01:00
parent 63b3cfdc73
commit 731abd9978
1 changed files with 18 additions and 3 deletions
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21
Libraries/LibJS/StringPrototype.cpp
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@ -25,6 +25,7 @@
*/ */
#include <AK/Function.h> #include <AK/Function.h>
#include <AK/StringBuilder.h>
#include <LibJS/Heap.h> #include <LibJS/Heap.h>
#include <LibJS/Interpreter.h> #include <LibJS/Interpreter.h>
#include <LibJS/PrimitiveString.h> #include <LibJS/PrimitiveString.h>
@ -34,13 +35,11 @@
namespace JS { namespace JS {
StringPrototype::StringPrototype() StringPrototype::StringPrototype()
{ {
put_native_property( put_native_property(
"length", [](Object* this_object) { "length", [](Object* this_object) {
ASSERT(this_object); ASSERT(this_object);
ASSERT(this_object->is_string_object()); ASSERT(this_object->is_string_object());
return Value((i32) static_cast<const StringObject*>(this_object)->primitive_string()->string().length()); return Value((i32) static_cast<const StringObject*>(this_object)->primitive_string()->string().length());
}, },
@ -56,6 +55,22 @@ StringPrototype::StringPrototype()
return js_string(this_object->heap(), String::empty()); return js_string(this_object->heap(), String::empty());
return js_string(this_object->heap(), underlying_string.substring(index, 1)); return js_string(this_object->heap(), underlying_string.substring(index, 1));
}); });
put_native_function("repeat", [](Object* this_object, Vector<Value> arguments) -> Value {
ASSERT(this_object->is_string_object());
if (arguments.is_empty())
return js_string(this_object->heap(), String::empty());
i32 count = 0;
count = arguments[0].to_i32();
if (count < 0) {
// FIXME: throw RangeError
return js_undefined();
}
auto* string_object = static_cast<StringObject*>(this_object);
StringBuilder builder;
for (i32 i = 0; i < count; ++i)
builder.append(string_object->primitive_string()->string());
return js_string(this_object->heap(), builder.to_string());
});
} }
StringPrototype::~StringPrototype() StringPrototype::~StringPrototype()