blob: 4a36ff717ed4ff5866a271d5ef04552ba084334c [file] [log] [blame]
/*
* Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "PaymentRequestUtilities.h"
#if ENABLE(PAYMENT_REQUEST)
namespace WebCore {
// Implements the "valid decimal monetary value" validity checker
// https://www.w3.org/TR/payment-request/#dfn-valid-decimal-monetary-value
bool isValidDecimalMonetaryValue(StringView value)
{
enum class State {
Start,
Sign,
Digit,
Dot,
DotDigit,
};
auto state = State::Start;
for (auto character : value.codeUnits()) {
switch (state) {
case State::Start:
if (character == '-') {
state = State::Sign;
break;
}
if (isASCIIDigit(character)) {
state = State::Digit;
break;
}
return false;
case State::Sign:
if (isASCIIDigit(character)) {
state = State::Digit;
break;
}
return false;
case State::Digit:
if (character == '.') {
state = State::Dot;
break;
}
if (isASCIIDigit(character)) {
state = State::Digit;
break;
}
return false;
case State::Dot:
if (isASCIIDigit(character)) {
state = State::DotDigit;
break;
}
return false;
case State::DotDigit:
if (isASCIIDigit(character)) {
state = State::DotDigit;
break;
}
return false;
}
}
return state == State::Digit || state == State::DotDigit;
}
} // namespace WebCore
#endif // ENABLE(PAYMENT_REQUEST)