Add unit tests for lexical_cast

diff --git a/tests/lexicalcast.cpp b/tests/lexicalcast.cpp
new file mode 100644 (file)
index 0000000..a983f1b
--- /dev/null
+++ b/tests/lexicalcast.cpp
@@ -0,0 +1,213 @@
+#include <limits>
+#include <msp/core/inttypes.h>
+#include <msp/strings/utils.h>
+#include <msp/test/test.h>
+
+using namespace std;
+using namespace Msp;
+
+class LexicalCastTests: public Test::RegisteredTest<LexicalCastTests>
+{
+private:
+       template<typename T>
+       struct Value
+       {
+               T value;
+               const char *format;
+               const char *result;
+       };
+
+public:
+       LexicalCastTests();
+
+       static const char *get_name() { return "lexical_cast"; }
+
+private:
+       void basic_integers();
+       void hex_integers();
+       void oct_integers();
+       void bin_integers();
+       void integer_limits();
+       void float_fixed();
+       void float_auto();
+       void float_sci();
+       void float_corner_cases();
+
+       template<typename T>
+       void test_values(const Value<T> *);
+};
+
+LexicalCastTests::LexicalCastTests()
+{
+       add(&LexicalCastTests::basic_integers, "Basic integers");
+       add(&LexicalCastTests::hex_integers, "Hexadecimal integers");
+       add(&LexicalCastTests::oct_integers, "Octal integers");
+       add(&LexicalCastTests::bin_integers, "Binary integers");
+       add(&LexicalCastTests::integer_limits, "Integer limits");
+       add(&LexicalCastTests::float_fixed, "Fixed-precision floats");
+       add(&LexicalCastTests::float_auto, "Automatic floats");
+       add(&LexicalCastTests::float_sci, "Scientific floats");
+       add(&LexicalCastTests::float_corner_cases, "Float corner cases");
+}
+
+void LexicalCastTests::basic_integers()
+{
+       Value<int> values[] =
+       {
+               { 0, "%d", "0" },
+               { 1, "%4d", "   1" },
+               { 1, "%04d", "0001" },
+               { 1, "%-04d", "1   " },
+               { 1, "%+4d", "  +1" },
+               { 1, "%+04d", "+001" },
+               { 1, "%+-4d", "+1  " },
+               { -1, "%d", "-1" },
+               { -1, "%04d", "-001" },
+               { 999999999, "%d", "999999999" },
+               { 1000000000, "%d", "1000000000" },
+               { 1234567890, "%d", "1234567890" },
+               { 0, 0, 0 }
+       };
+       test_values<int>(values);
+}
+
+void LexicalCastTests::hex_integers()
+{
+       Value<int> values[] =
+       {
+               { 0xabcd, "%x", "abcd" },
+               { 0xabcd, "%#x", "0xabcd" },
+               { 0xabcd, "%#8x", "  0xabcd" },
+               { 0xabcd, "%-#8x", "0xabcd  " },
+               { 0xabcd, "%#08x", "0x00abcd" },
+               { 0xabcd, "%#X", "0XABCD" },
+               { 0xabcd, "%+#x", "+0xabcd" },
+               { -0xabcd, "%#x", "-0xabcd" },
+               { 0, 0, 0 }
+       };
+       test_values<int>(values);
+}
+
+void LexicalCastTests::oct_integers()
+{
+       Value<int> values[] =
+       {
+               { 012345, "%o", "12345" },
+               { 012345, "%#o", "012345" },
+               { 012345, "%#8o", "  012345" },
+               { 012345, "%-#8o", "012345  " },
+               { 012345, "%#08o", "00012345" },
+               { 012345, "%+#o", "+012345" },
+               { -012345, "%#o", "-012345" },
+       };
+       test_values<int>(values);
+}
+
+void LexicalCastTests::bin_integers()
+{
+       Value<int> values[] =
+       {
+               { 0xcf3, "%b", "110011110011" },
+               { 0xcf3, "%#b", "0b110011110011" },
+               { 0xcf3, "%#16b", "  0b110011110011" },
+               { 0xcf3, "%-#16b", "0b110011110011  " },
+               { 0xcf3, "%#016b", "0b00110011110011" },
+               { 0xcf3, "%+#b", "+0b110011110011" },
+               { -0xcf3, "%#b", "-0b110011110011" },
+       };
+       test_values<int>(values);
+}
+
+void LexicalCastTests::integer_limits()
+{
+       Value<Int32> int32_values[] =
+       {
+               { numeric_limits<Int32>::max(), "%d", "2147483647" },
+               { numeric_limits<Int32>::max(), "%x", "7fffffff" },
+               { numeric_limits<Int32>::min(), "%d", "-2147483648" },
+               { numeric_limits<Int32>::min(), "%x", "-80000000" },
+               { 0, 0, 0 }
+       };
+       test_values<Int32>(int32_values);
+
+       Value<UInt32> uint32_values[] =
+       {
+               { numeric_limits<UInt32>::max(), "%d", "4294967295" },
+               { numeric_limits<UInt32>::max(), "%x", "ffffffff" },
+               { 0, 0, 0 }
+       };
+       test_values<UInt32>(uint32_values);
+}
+
+void LexicalCastTests::float_fixed()
+{
+       Value<float> float_values[] =
+       {
+               { 0, "%f", "0.000000" },
+               { 1, "%.0f", "1" },
+               { 1, "%#.0f", "1." },
+               { 1, "%06.2f", "001.00" },
+               { 1, "%.1f", "1.0" },
+               { 0.0987, "%f", "0.098700" },
+               { 0.0987, "%.3f", "0.099" },
+               { 0.0987, "%.2f", "0.10" },
+               { 0, 0, 0 }
+       };
+       test_values<float>(float_values);
+}
+
+void LexicalCastTests::float_auto()
+{
+       Value<float> float_values[] =
+       {
+               { 0, "%g", "0" },
+               { 1, "%#g", "1.00000" },
+               { 100, "%.3g", "100" },
+               { 1000, "%.3g", "1e+03" },
+               { 1100, "%.3g", "1.1e+03" },
+               { 1e-5, "%g", "1e-05" },
+               { 0.0987, "%g", "0.0987" },
+               { 0.0987, "%.3g", "0.0987" },
+               { 0.0987, "%.2g", "0.099" },
+               { 0, 0, 0 }
+       };
+       test_values<float>(float_values);
+}
+
+void LexicalCastTests::float_sci()
+{
+       Value<float> float_values[] =
+       {
+               { 0, "%e", "0.000000e+00" },
+               { 0.0987, "%e", "9.870000e-02" },
+               { 0.0987, "%.3e", "9.870e-02" },
+               { 0.0987, "%.1e", "9.9e-02" },
+               { 0, 0, 0 }
+       };
+       test_values<float>(float_values);
+}
+
+void LexicalCastTests::float_corner_cases()
+{
+       Value<float> float_values[] =
+       {
+               { 10, "%.20f", "10.00000000000000000000" },
+               { 10, "%.20g", "10" },
+               { 99.99, "%#.3g", "100." },
+               { 999.9, "%.3g", "1e+03" },
+               { 0.09999999, "%.3g", "0.1" },
+               { 0.09999999, "%.3f", "0.100" },
+               { 0, 0, 0 }
+       };
+       test_values<float>(float_values);
+}
+
+template<typename T>
+void LexicalCastTests::test_values(const Value<T> *values)
+{
+       for(const Value<T> *i=values; i->format; ++i)
+       {
+               string result = lexical_cast(i->value, i->format);
+               expect_equal(result, result==i->result, format("result == \"%s\"", c_escape(i->result)));
+       }
+}