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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkValueFromString.h"
#include <array>
#include <bitset>
#include <climits>
#include <cmath>
#include <cstdint>
#include <iostream>
#include <limits>
#include <sstream>
#include <string>
#define Check(expr, message) \
if (!(expr)) \
{ \
std::cout << __FILE__ << " L." << __LINE__ << " | " << #expr << " failed: \n" \
<< message << std::endl; \
return false; \
} \
do \
{ \
} while (false)
// Convert a value to hex, oct or dec representation and parse it to check if parsed value is equal
// to input
template <typename T>
static bool TestIntParseHelper(T value, std::ios_base::fmtflags flags)
{
std::ostringstream oss{};
// don't use showbase for octal because stdlib uses unsupported 0{value} format
if ((flags & std::ios_base::oct) != 0)
{
oss.flags(flags);
oss << "0o"; // add prefix ourself
}
else
{
oss.flags(flags | std::ios_base::showbase);
}
// Hide msvc "conditional expression is constant" warning
bool isChar = std::is_same<T, signed char>::value || std::is_same<T, unsigned char>::value;
if (isChar)
{
oss << static_cast<int>(value); // ostream output [un]signed char as ASCII char instead of int
}
else
{
oss << value;
}
const std::string str{ oss.str() };
T read{};
auto count = vtkValueFromString(str.data(), str.data() + str.size(), read);
Check(count != 0, "Parsing failed");
Check(read == value, "Wrong value");
Check(count == str.size(), "Input not entirely consumed");
return true;
}
// Convert a value to binary representation and parse it to check if parsed value is equal to input
template <typename T>
static bool TestIntParseBinaryHelper(T value)
{
using UnsignedType = typename std::make_unsigned<T>::type;
std::bitset<sizeof(T) * CHAR_BIT> bitset{ static_cast<unsigned long long>(
reinterpret_cast<UnsignedType&>(value)) };
const std::string str{ "0b" + bitset.to_string() };
T read{};
auto count = vtkValueFromString(str.data(), str.data() + str.size(), read);
Check(count != 0, "Parsing failed");
Check(read == value, "Wrong value");
Check(count == str.size(), "Input not entirely consumed");
return true;
}
// Check a predefined set of values for each type
template <typename T, typename std::enable_if<std::is_signed<T>::value>::type* = nullptr>
static bool TestIntParseFor()
{
constexpr std::array<T, 5> values = { { static_cast<T>(0), static_cast<T>(1), static_cast<T>(42),
(std::numeric_limits<T>::max)(), (std::numeric_limits<T>::max)() - 1 } };
for (T value : values)
{
Check(TestIntParseHelper(value, std::ios_base::dec), "Test failed");
Check(TestIntParseHelper(value, std::ios_base::oct), "Test failed");
Check(TestIntParseHelper(value, std::ios_base::hex), "Test failed");
Check(TestIntParseBinaryHelper(value), "Test failed");
}
// Negative values only make sense in decimal
Check(TestIntParseHelper(static_cast<T>(-1), std::ios_base::dec), "Test failed");
Check(TestIntParseHelper(static_cast<T>(-42), std::ios_base::dec), "Test failed");
Check(TestIntParseHelper((std::numeric_limits<T>::min)(), std::ios_base::dec), "Test failed");
Check(TestIntParseHelper((std::numeric_limits<T>::min)() + 1, std::ios_base::dec), "Test failed");
return true;
}
// Check a predefined set of values for each type
template <typename T, typename std::enable_if<std::is_unsigned<T>::value>::type* = nullptr>
static bool TestIntParseFor()
{
constexpr std::array<T, 5> values = { { static_cast<T>(0), static_cast<T>(1), static_cast<T>(42),
(std::numeric_limits<T>::max)(), (std::numeric_limits<T>::max)() - 1 } };
for (T value : values)
{
Check(TestIntParseHelper(value, std::ios_base::dec), "Test failed");
Check(TestIntParseHelper(value, std::ios_base::oct), "Test failed");
Check(TestIntParseHelper(value, std::ios_base::hex), "Test failed");
Check(TestIntParseBinaryHelper(value), "Test failed");
}
return true;
}
// Convert a value to hex, oct or dec representation and parse it to check if parsed value is equal
// to input. HelperType enable to check under/overflow using a larger type.
template <typename RealType, typename HelperType>
static bool TestIntParseLimitHelper(HelperType value, std::ios_base::fmtflags flags)
{
std::ostringstream oss{};
oss.setf(flags | std::ios_base::showbase);
oss << value;
const std::string str{ oss.str() };
RealType read{};
auto count = vtkValueFromString(str.data(), str.data() + str.size(), read);
Check(count == 0, "Parsing must fail on overflow/underflow");
Check(read == 0, "Output variable must not change on failure");
return true;
}
// Convert a value to binary representation and parse it to check if parsed value is equal to input.
// HelperType enable to check under/overflow using a larger type.
template <typename RealType, typename HelperType>
static bool TestIntParseLimitBinaryHelper(HelperType value)
{
using UnsignedType = typename std::make_unsigned<HelperType>::type;
std::bitset<sizeof(HelperType) * CHAR_BIT> bitset{ static_cast<unsigned long long>(
reinterpret_cast<UnsignedType&>(value)) };
const std::string str{ "0b" + bitset.to_string() };
RealType read{};
auto count = vtkValueFromString(str.data(), str.data() + str.size(), read);
Check(count == 0, "Parsing must fail on overflow/underflow");
Check(read == 0, "Output variable must not change on failure");
return true;
}
// Try to parse any input string and check if the result is expected
template <typename T>
bool TestParseHelper(const std::string& str, bool expectedSuccess, T expectedValue)
{
T value{};
auto count = vtkValueFromString(str.data(), str.data() + str.size(), value);
// Check that output value and pointer are coherent
if (expectedSuccess)
{
Check(count != 0, "Expected success but parsing failed");
Check(value == expectedValue, "Value don't match");
Check(count == str.size(), "Range not entirely consumed");
}
else
{
Check(count == 0, "Expected failure but parsing succeeded");
Check(value == T{}, "Output variable must not be modified in case of failure");
}
return true;
}
// Main int parsing test
static bool TestIntParse()
{
Check(TestIntParseFor<signed char>(), "Test failed");
Check(TestIntParseFor<unsigned char>(), "Test failed");
Check(TestIntParseFor<signed short>(), "Test failed");
Check(TestIntParseFor<unsigned short>(), "Test failed");
Check(TestIntParseFor<signed int>(), "Test failed");
Check(TestIntParseFor<unsigned int>(), "Test failed");
Check(TestIntParseFor<signed long>(), "Test failed");
Check(TestIntParseFor<unsigned long>(), "Test failed");
Check(TestIntParseFor<signed long long>(), "Test failed");
Check(TestIntParseFor<unsigned long long>(), "Test failed");
// Check on 16-bits integers, assume it does work for any size < intmax_t
Check(TestIntParseLimitHelper<std::int16_t>(32768, std::ios_base::dec), "Test failed");
Check(TestIntParseLimitHelper<std::int16_t>(-32769, std::ios_base::dec), "Test failed");
Check(TestIntParseLimitHelper<std::int16_t>(65536, std::ios_base::oct), "Test failed");
Check(TestIntParseLimitHelper<std::int16_t>(65536, std::ios_base::hex), "Test failed");
Check(TestIntParseLimitBinaryHelper<std::int16_t>(65536), "Test failed");
// Check intmax_t (long long in practice)
Check(TestParseHelper("9223372036854775808", false, 0ll), "Test failed");
Check(TestParseHelper("-9223372036854775809", false, 0ll), "Test failed");
Check(TestParseHelper("0x10000000000000000", false, 0ll), "Test failed");
Check(TestParseHelper("0o2000000000000000000000", false, 0ll), "Test failed");
Check(TestParseHelper(
"10000000000000000000000000000000000000000000000000000000000000000", false, 0ll),
"Test failed");
return true;
}
// Main float parsing test
static bool TestFloatParse()
{
// Since low level float parsing is handled by fast_float, this is a basic sanity check
{ // Check valid input
float f{};
std::string str{ "-3.14e2" };
auto count = vtkValueFromString(str.data(), str.data() + str.size(), f);
Check(count != 0, "Parsing failed");
Check(-3.140001e2 <= f && f <= -3.13999e2, "Wrong value, expected -314.0 got " << f);
Check(count == str.size(), "Invalid output pointer");
}
{ // Check invalid input
float f{ -3.0f };
std::string str{ "abc -3.14e2" };
auto count = vtkValueFromString(str.data(), str.data() + str.size(), f);
Check(count == 0, "Parsing must fail");
Check(-3.00001 <= f && f <= -2.99999, "Input must not be modified");
}
return true;
}
// Main bool parsing test
static bool TestBoolParse()
{
Check(TestParseHelper("true", true, true), "Test failed");
Check(TestParseHelper("1", true, true), "Test failed");
Check(TestParseHelper("false", true, false), "Test failed");
Check(TestParseHelper("0", true, false), "Test failed");
Check(TestParseHelper("False", true, false), "Test failed");
Check(TestParseHelper("True", true, true), "Test failed");
Check(TestParseHelper("2", false, false), "Must fail for 2");
Check(TestParseHelper("-1", false, false), "Must fail for -1");
Check(TestParseHelper(" 1", false, false), "Must not trim string");
Check(TestParseHelper("TRUE", false, false), "Must be case sensitive");
Check(TestParseHelper("FalSe", false, false), "Must be case sensitive");
Check(TestParseHelper(" true", false, false), "Must not trim string");
Check(TestParseHelper(" 1", false, false), "Must not trim string");
Check(TestParseHelper(" false", false, false), "Must not trim string");
Check(TestParseHelper(" 0", false, false), "Must not trim string");
return true;
}
int TestValueFromString(int, char*[])
{
if (!TestIntParse())
{
return EXIT_FAILURE;
}
if (!TestFloatParse())
{
return EXIT_FAILURE;
}
if (!TestBoolParse())
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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