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30eb927ad4
* Properly handle numbers at the edge of precision * Improve and expand unit test coverage
281 lines
8.1 KiB
C++
281 lines
8.1 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <beast/unit_test/suite.h>
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namespace beast {
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class LexicalCast_test : public unit_test::suite
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{
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public:
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template <class IntType>
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static IntType nextRandomInt (Random& r)
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{
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return static_cast <IntType> (r.nextInt64 ());
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}
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template <class IntType>
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void testInteger (IntType in)
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{
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std::string s;
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IntType out (in+1);
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expect (lexicalCastChecked (s, in));
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expect (lexicalCastChecked (out, s));
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expect (out == in);
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}
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template <class IntType>
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void testIntegers (Random& r)
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{
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{
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std::stringstream ss;
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ss <<
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"random " << typeid (IntType).name ();
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testcase (ss.str());
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for (int i = 0; i < 1000; ++i)
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{
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IntType const value (nextRandomInt <IntType> (r));
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testInteger (value);
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}
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}
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{
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std::stringstream ss;
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ss <<
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"numeric_limits <" << typeid (IntType).name () << ">";
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testcase (ss.str());
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testInteger (std::numeric_limits <IntType>::min ());
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testInteger (std::numeric_limits <IntType>::max ());
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}
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}
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void testPathologies()
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{
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testcase("pathologies");
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try
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{
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lexicalCastThrow<int>("\xef\xbc\x91\xef\xbc\x90"); // utf-8 encoded
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}
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catch(BadLexicalCast const&)
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{
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pass();
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}
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}
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template <class T>
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void tryBadConvert (std::string const& s)
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{
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T out;
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expect (!lexicalCastChecked (out, s), s);
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}
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void testConversionOverflows()
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{
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testcase ("conversion overflows");
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tryBadConvert <std::uint64_t> ("99999999999999999999");
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tryBadConvert <std::uint32_t> ("4294967300");
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tryBadConvert <std::uint16_t> ("75821");
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}
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void testConversionUnderflows ()
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{
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testcase ("conversion underflows");
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tryBadConvert <std::uint32_t> ("-1");
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tryBadConvert <std::int64_t> ("-99999999999999999999");
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tryBadConvert <std::int32_t> ("-4294967300");
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tryBadConvert <std::int16_t> ("-75821");
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}
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template <class T>
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bool tryEdgeCase (std::string const& s)
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{
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T ret;
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bool const result = lexicalCastChecked (ret, s);
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if (!result)
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return false;
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return s == std::to_string (ret);
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}
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void testEdgeCases ()
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{
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testcase ("conversion edge cases");
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expect(tryEdgeCase <std::uint64_t> ("18446744073709551614"));
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expect(tryEdgeCase <std::uint64_t> ("18446744073709551615"));
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expect(!tryEdgeCase <std::uint64_t> ("18446744073709551616"));
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expect(tryEdgeCase <std::int64_t> ("9223372036854775806"));
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expect(tryEdgeCase <std::int64_t> ("9223372036854775807"));
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expect(!tryEdgeCase <std::int64_t> ("9223372036854775808"));
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expect(tryEdgeCase <std::int64_t> ("-9223372036854775807"));
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expect(tryEdgeCase <std::int64_t> ("-9223372036854775808"));
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expect(!tryEdgeCase <std::int64_t> ("-9223372036854775809"));
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expect(tryEdgeCase <std::uint32_t> ("4294967294"));
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expect(tryEdgeCase <std::uint32_t> ("4294967295"));
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expect(!tryEdgeCase <std::uint32_t> ("4294967296"));
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expect(tryEdgeCase <std::int32_t> ("2147483646"));
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expect(tryEdgeCase <std::int32_t> ("2147483647"));
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expect(!tryEdgeCase <std::int32_t> ("2147483648"));
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expect(tryEdgeCase <std::int32_t> ("-2147483647"));
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expect(tryEdgeCase <std::int32_t> ("-2147483648"));
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expect(!tryEdgeCase <std::int32_t> ("-2147483649"));
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expect(tryEdgeCase <std::uint16_t> ("65534"));
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expect(tryEdgeCase <std::uint16_t> ("65535"));
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expect(!tryEdgeCase <std::uint16_t> ("65536"));
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expect(tryEdgeCase <std::int16_t> ("32766"));
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expect(tryEdgeCase <std::int16_t> ("32767"));
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expect(!tryEdgeCase <std::int16_t> ("32768"));
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expect(tryEdgeCase <std::int16_t> ("-32767"));
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expect(tryEdgeCase <std::int16_t> ("-32768"));
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expect(!tryEdgeCase <std::int16_t> ("-32769"));
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}
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template <class T>
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void testThrowConvert(std::string const& s, bool success)
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{
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bool result = !success;
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T out;
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try
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{
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out = lexicalCastThrow <T> (s);
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result = true;
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}
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catch(BadLexicalCast const&)
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{
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result = false;
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}
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expect (result == success, s);
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}
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void testThrowingConversions ()
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{
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testcase ("throwing conversion");
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testThrowConvert <std::uint64_t> ("99999999999999999999", false);
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testThrowConvert <std::uint64_t> ("9223372036854775806", true);
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testThrowConvert <std::uint32_t> ("4294967290", true);
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testThrowConvert <std::uint32_t> ("42949672900", false);
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testThrowConvert <std::uint32_t> ("429496729000", false);
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testThrowConvert <std::uint32_t> ("4294967290000", false);
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testThrowConvert <std::int32_t> ("5294967295", false);
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testThrowConvert <std::int32_t> ("-2147483644", true);
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testThrowConvert <std::int16_t> ("66666", false);
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testThrowConvert <std::int16_t> ("-5711", true);
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}
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void testZero ()
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{
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testcase ("zero conversion");
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{
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std::int32_t out;
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expect (lexicalCastChecked (out, "-0"), "0");
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expect (lexicalCastChecked (out, "0"), "0");
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expect (lexicalCastChecked (out, "+0"), "0");
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}
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{
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std::uint32_t out;
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expect (!lexicalCastChecked (out, "-0"), "0");
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expect (lexicalCastChecked (out, "0"), "0");
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expect (lexicalCastChecked (out, "+0"), "0");
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}
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}
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void testEntireRange ()
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{
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testcase ("entire range");
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std::int32_t i = std::numeric_limits<std::int16_t>::min();
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std::string const empty("");
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while (i <= std::numeric_limits<std::int16_t>::max())
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{
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std::int16_t j = static_cast<std::int16_t>(i);
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auto actual = std::to_string (j);
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auto result = lexicalCast (j, empty);
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expect (result == actual, actual + " (string to integer)");
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if (result == actual)
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{
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auto number = lexicalCast <std::int16_t> (result);
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if (number != j)
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expect (false, actual + " (integer to string)");
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}
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i++;
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}
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}
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void run()
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{
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std::int64_t const seedValue = 50;
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Random r (seedValue);
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testIntegers <int> (r);
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testIntegers <unsigned int> (r);
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testIntegers <short> (r);
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testIntegers <unsigned short> (r);
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testIntegers <std::int32_t> (r);
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testIntegers <std::uint32_t> (r);
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testIntegers <std::int64_t> (r);
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testIntegers <std::uint64_t> (r);
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testPathologies();
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testConversionOverflows ();
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testConversionUnderflows ();
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testThrowingConversions ();
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testZero ();
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testEdgeCases ();
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testEntireRange ();
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}
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};
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BEAST_DEFINE_TESTSUITE(LexicalCast,beast_core,beast);
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} // beast
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