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LibJS: Handle empty strings and arrays in Value::to_number()

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- An empty string is converted to 0
 - An empty array is converted to 0
 - An array with one item is converted to that item's numeric value
 - An array with more than one item is converted to NaN
This commit is contained in:
Linus Groh 2020-03-29 15:20:09 +01:00 • committed by Andreas Kling
parent 2d3634d5f5
commit bad0556a59
2 changed files with 12 additions and 14 deletions
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14
Libraries/LibJS/Runtime/MathObject.cpp
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@ -27,7 +27,6 @@
#include <AK/FlyString.h> #include <AK/FlyString.h>
#include <AK/Function.h> #include <AK/Function.h>
#include <LibJS/Interpreter.h> #include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/MathObject.h> #include <LibJS/Runtime/MathObject.h>
namespace JS { namespace JS {
@ -47,18 +46,7 @@ Value MathObject::abs(Interpreter& interpreter)
if (interpreter.call_frame().arguments.is_empty()) if (interpreter.call_frame().arguments.is_empty())
return js_nan(); return js_nan();
auto argument = interpreter.call_frame().arguments[0]; auto number = interpreter.call_frame().arguments[0].to_number();
if (argument.is_array()) {
auto& array = *static_cast<const Array*>(argument.as_object());
if (array.length() == 0)
return Value(0);
if (array.length() > 1)
return js_nan();
argument = array.elements()[0];
}
auto number = argument.to_number();
if (number.is_nan()) if (number.is_nan())
return js_nan(); return js_nan();
return Value(number.as_double() >= 0 ? number.as_double() : -number.as_double()); return Value(number.as_double() >= 0 ? number.as_double() : -number.as_double());

12
Libraries/LibJS/Runtime/Value.cpp
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@ -28,6 +28,7 @@
#include <AK/String.h> #include <AK/String.h>
#include <LibJS/Heap/Heap.h> #include <LibJS/Heap/Heap.h>
#include <LibJS/Interpreter.h> #include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h> #include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Object.h> #include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h> #include <LibJS/Runtime/PrimitiveString.h>
@ -128,7 +129,16 @@ Value Value::to_number() const
case Type::Undefined: case Type::Undefined:
return js_nan(); return js_nan();
case Type::Object: case Type::Object:
return m_value.as_object->to_primitive(Object::PreferredType::Number).to_number(); if (m_value.as_object->is_array()) {
auto& array = *static_cast<Array*>(m_value.as_object);
if (array.length() == 0)
return Value(0);
if (array.length() > 1)
return js_nan();
return array.elements()[0].to_number();
} else {
return m_value.as_object->to_primitive(Object::PreferredType::Number).to_number();
}
} }
ASSERT_NOT_REACHED(); ASSERT_NOT_REACHED();