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LibJS: Add parseFloat()

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Linus Groh 2020-05-17 15:12:34 +01:00 • committed by Andreas Kling
parent cc42d75209
commit 6f6b089aa0
3 changed files with 87 additions and 0 deletions
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15
Libraries/LibJS/Runtime/GlobalObject.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -82,6 +83,7 @@ void GlobalObject::initialize()
put_native_function("gc", gc, 0, attr);
put_native_function("isNaN", is_nan, 1, attr);
put_native_function("isFinite", is_finite, 1, attr);
put_native_function("parseFloat", parse_float, 1, attr);
put("NaN", js_nan(), 0);
put("Infinity", js_infinity(), 0);
@ -140,4 +142,17 @@ Value GlobalObject::is_finite(Interpreter& interpreter)
return Value(interpreter.argument(0).to_number().is_finite_number());
}
Value GlobalObject::parse_float(Interpreter& interpreter)
{
auto string = interpreter.argument(0).to_string(interpreter);
if (interpreter.exception())
return {};
for (size_t length = string.length(); length > 0; --length) {
auto number = Value(js_string(interpreter, string.substring(0, length))).to_number();
if (!number.is_nan())
return number;
}
return js_nan();
}
}