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LibJS: Add String.fromCharCode()

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Linus Groh 2020-05-31 00:47:28 +01:00 • committed by Andreas Kling
parent 8c05e78b6c
commit e33820b557
3 changed files with 42 additions and 1 deletions
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19
Libraries/LibJS/Runtime/StringConstructor.cpp
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@ -25,6 +25,7 @@
*/
#include <AK/StringBuilder.h>
#include <AK/Utf32View.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
@ -40,7 +41,9 @@ StringConstructor::StringConstructor()
define_property("prototype", interpreter().global_object().string_prototype(), 0);
define_property("length", Value(1), Attribute::Configurable);
define_native_function("raw", raw, 0, Attribute::Writable | Attribute::Configurable);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function("raw", raw, 0, attr);
define_native_function("fromCharCode", from_char_code, 1, attr);
}
StringConstructor::~StringConstructor()
@ -106,4 +109,18 @@ Value StringConstructor::raw(Interpreter& interpreter)
return js_string(interpreter, builder.build());
}
Value StringConstructor::from_char_code(Interpreter& interpreter)
{
StringBuilder builder;
for (size_t i = 0; i < interpreter.argument_count(); ++i) {
auto char_code = interpreter.argument(i).to_i32(interpreter);
if (interpreter.exception())
return {};
auto truncated = char_code & 0xffff;
// FIXME: We need an Utf16View :^)
builder.append(Utf32View((u32*)&truncated, 1));
}
return js_string(interpreter, builder.build());
}
}

1
Libraries/LibJS/Runtime/StringConstructor.h
View file

@ -43,6 +43,7 @@ private:
virtual const char* class_name() const override { return "StringConstructor"; }
static Value raw(Interpreter&);
static Value from_char_code(Interpreter&);
};
}

23
Libraries/LibJS/Tests/String.fromCharCode.js Normal file
View file

@ -0,0 +1,23 @@
load("test-common.js");
try {
assert(String.fromCharCode.length === 1);
assert(String.fromCharCode() === "");
assert(String.fromCharCode(0) === "\u0000");
assert(String.fromCharCode(false) === "\u0000");
assert(String.fromCharCode(null) === "\u0000");
assert(String.fromCharCode(undefined) === "\u0000");
assert(String.fromCharCode(1) === "\u0001");
assert(String.fromCharCode(true) === "\u0001");
assert(String.fromCharCode(-1) === "\uffff");
assert(String.fromCharCode(0xffff) === "\uffff");
assert(String.fromCharCode(0x123ffff) === "\uffff");
assert(String.fromCharCode(65) === "A");
assert(String.fromCharCode(65, 66, 67) === "ABC");
assert(String.fromCharCode(228, 246, 252) === "äöü");
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}