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More tests.

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This commit is contained in:
Victor Zverovich 2012-12-08 18:45:35 -08:00
parent 63539c03b0
commit 8b1c7098ec
3 changed files with 120 additions and 38 deletions
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81
format.cc
View File

@ -12,11 +12,13 @@
using std::size_t;
// Throws Exception(message) if s contains '}' and FormatError reporting
// unmatched '{' otherwise. The idea is that unmatched '{' should override
// other errors.
namespace {
// Throws Exception(message) if format contains '}', otherwise throws
// FormatError reporting unmatched '{'. The idea is that unmatched '{'
// should override other errors.
template <typename Exception>
static void Throw(const char *s, const char *message) {
void Throw(const char *s, const char *message) {
while (*s && *s != '}')
++s;
if (!*s)
@ -24,6 +26,35 @@ static void Throw(const char *s, const char *message) {
throw Exception(message);
}
// Parses an unsigned integer advancing s to the end of the parsed input.
// This function assumes that the first character of s is a digit.
unsigned ParseUInt(const char *&s) {
assert('0' <= *s && *s <= '9');
unsigned value = 0;
do {
unsigned new_value = value * 10 + (*s++ - '0');
if (new_value < value) // Check if value wrapped around.
Throw<fmt::FormatError>(s, "number is too big in format");
value = new_value;
} while ('0' <= *s && *s <= '9');
return value;
}
// Flags.
enum {
PLUS_FLAG = 1,
ZERO_FLAG = 2
};
void CheckFlags(unsigned flags) {
if (flags == 0) return;
if ((flags & PLUS_FLAG) != 0)
throw fmt::FormatError("format specifier '+' used with non-numeric type");
if ((flags & ZERO_FLAG) != 0)
throw fmt::FormatError("format specifier '0' used with non-numeric type");
}
}
template <typename T>
void fmt::Formatter::FormatArg(
const char *format, const T &arg, int width, int precision) {
@ -58,17 +89,9 @@ void fmt::Formatter::Format() {
buffer_.insert(buffer_.end(), start, s - 1);
// Parse argument index.
unsigned arg_index = 0;
if ('0' <= *s && *s <= '9') {
do {
unsigned index = arg_index * 10 + (*s++ - '0');
if (index < arg_index) // Check if index wrapped around.
Throw<FormatError>(s, "argument index is too big"); // TODO: test
arg_index = index;
} while ('0' <= *s && *s <= '9');
} else {
Throw<FormatError>(s, "missing argument index in format string");
}
if (*s < '0' || *s > '9')
Throw<fmt::FormatError>(s, "missing argument index in format string");
unsigned arg_index = ParseUInt(s);
if (arg_index >= args_.size())
Throw<std::out_of_range>(s, "argument index is out of range in format");
@ -76,24 +99,27 @@ void fmt::Formatter::Format() {
char *arg_format_ptr = arg_format;
*arg_format_ptr++ = '%';
char type = 0;
unsigned flags = 0;
int width = -1;
int precision = -1;
char type = 0;
if (*s == ':') {
++s;
if (*s == '+')
if (*s == '+') {
flags |= PLUS_FLAG;
*arg_format_ptr++ = *s++;
if (*s == '0')
}
if (*s == '0') {
flags |= ZERO_FLAG;
*arg_format_ptr++ = *s++;
}
// Parse width.
if ('0' <= *s && *s <= '9') {
*arg_format_ptr++ = '*';
width = 0;
do {
// TODO: check overflow
width = width * 10 + (*s++ - '0');
} while ('0' <= *s && *s <= '9');
unsigned number = ParseUInt(s);
if (number > INT_MAX) ; // TODO: error
width = number;
}
// Parse precision.
@ -118,13 +144,14 @@ void fmt::Formatter::Format() {
}
if (*s++ != '}')
throw FormatError("single '{' encountered in format string");
throw FormatError("unmatched '{' in format");
start = s;
// Format argument.
Arg &arg = args_[arg_index];
switch (arg.type) {
case CHAR:
CheckFlags(flags);
if (width == -1 && precision == -1) {
buffer_.push_back(arg.int_value);
break;
@ -161,12 +188,13 @@ void fmt::Formatter::Format() {
FormatArg(arg_format, arg.double_value, width, precision);
break;
case LONG_DOUBLE:
*arg_format_ptr++ = 'l';
*arg_format_ptr++ = 'L';
*arg_format_ptr++ = 'g';
*arg_format_ptr = '\0';
FormatArg(arg_format, arg.long_double_value, width, precision);
break;
case STRING:
CheckFlags(flags);
if (width == -1 && precision == -1) {
const char *str = arg.string_value;
buffer_.insert(buffer_.end(), str, str + std::strlen(str));
@ -177,17 +205,20 @@ void fmt::Formatter::Format() {
FormatArg(arg_format, arg.string_value, width, precision);
break;
case WSTRING:
CheckFlags(flags);
*arg_format_ptr++ = 'l';
*arg_format_ptr++ = 's';
*arg_format_ptr = '\0';
FormatArg(arg_format, arg.wstring_value, width, precision);
break;
case POINTER:
CheckFlags(flags);
*arg_format_ptr++ = 'p';
*arg_format_ptr = '\0';
FormatArg(arg_format, arg.pointer_value, width, precision);
break;
case OTHER:
CheckFlags(flags);
(this->*arg.format)(arg.other_value);
break;
default:

20
format.h
View File

@ -108,13 +108,6 @@ class Formatter {
}
};
template <typename T>
struct AddPtrConst { typedef T Value; };
// Convert "T*" into "const T*".
template <typename T>
struct AddPtrConst<T*> { typedef const T* Value; };
class ArgFormatter {
private:
friend class Formatter;
@ -193,6 +186,11 @@ class ArgFormatter {
return *this;
}
ArgFormatter &operator<<(const wchar_t *value) {
formatter_->Add(Formatter::Arg(value));
return *this;
}
ArgFormatter &operator<<(const void *value) {
formatter_->Add(Formatter::Arg(value));
return *this;
@ -203,11 +201,17 @@ class ArgFormatter {
template <typename T>
ArgFormatter &operator<<(const T *value);
template <typename T>
ArgFormatter &operator<<(T *value) {
const T *const_value = value;
return *this << const_value;
}
// If T is a pointer type, say "U*", AddPtrConst<T>::Value will be
// "const U*". This additional const ensures that operator<<(const void *)
// and not this method is called both for "const void*" and "void*".
template <typename T>
ArgFormatter &operator<<(const typename AddPtrConst<T>::Value &value) {
ArgFormatter &operator<<(const T &value) {
formatter_->Add(Formatter::Arg(&value, &Formatter::FormatOtherArg<T>));
return *this;
}

57
format_test.cc
View File

@ -68,8 +68,7 @@ TEST(FormatterTest, FormatArgs) {
EXPECT_EQ("abracadabra", str(Format("{0}{1}{0}") << "abra" << "cad"));
}
TEST(FormatterTest, FormatErrors) {
//Format("{");
TEST(FormatterTest, FormatArgErrors) {
EXPECT_THROW_MSG(Format("{"), FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{}"), FormatError,
"missing argument index in format string");
@ -86,14 +85,62 @@ TEST(FormatterTest, FormatErrors) {
std::sprintf(format, "{%lu", UINT_MAX + 1l);
EXPECT_THROW_MSG(Format(format), FormatError, "unmatched '{' in format");
std::sprintf(format, "{%lu}", UINT_MAX + 1l);
EXPECT_THROW_MSG(Format(format), FormatError, "argument index is too big");
EXPECT_THROW_MSG(Format(format),
FormatError, "number is too big in format");
} else {
std::sprintf(format, "{%u0", UINT_MAX);
EXPECT_THROW_MSG(Format(format), FormatError, "unmatched '{' in format");
std::sprintf(format, "{%u0}", UINT_MAX);
EXPECT_THROW_MSG(Format(format), FormatError, "argument index is too big");
EXPECT_THROW_MSG(Format(format),
FormatError, "number is too big in format");
}
// TODO
}
struct UDT {};
TEST(FormatterTest, FormatPlusFlag) {
EXPECT_EQ("+42", str(Format("{0:+}") << 42));
EXPECT_EQ("-42", str(Format("{0:+}") << -42));
EXPECT_THROW_MSG(Format("{0:+") << 'c',
FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:+}") << 'c',
FormatError, "format specifier '+' used with non-numeric type");
EXPECT_EQ("+42", str(Format("{0:+}") << 42));
EXPECT_EQ("+42", str(Format("{0:+}") << 42u));
EXPECT_EQ("+42", str(Format("{0:+}") << 42l));
EXPECT_EQ("+42", str(Format("{0:+}") << 42ul));
EXPECT_EQ("+42", str(Format("{0:+}") << 42.0));
EXPECT_EQ("+42", str(Format("{0:+}") << 42.0l));
EXPECT_THROW_MSG(Format("{0:+}") << "abc",
FormatError, "format specifier '+' used with non-numeric type");
EXPECT_THROW_MSG(Format("{0:+}") << L"abc",
FormatError, "format specifier '+' used with non-numeric type");
EXPECT_THROW_MSG(Format("{0:+}") << static_cast<const void*>("abc"),
FormatError, "format specifier '+' used with non-numeric type");
EXPECT_THROW_MSG(Format("{0:+}") << UDT(),
FormatError, "format specifier '+' used with non-numeric type");
}
TEST(FormatterTest, FormatZeroFlag) {
EXPECT_EQ("42", str(Format("{0:0}") << 42));
EXPECT_THROW_MSG(Format("{0:0") << 'c',
FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:05}") << 'c',
FormatError, "format specifier '0' used with non-numeric type");
EXPECT_EQ("-0042", str(Format("{0:05}") << -42));
EXPECT_EQ("00042", str(Format("{0:05}") << 42u));
EXPECT_EQ("-0042", str(Format("{0:05}") << -42l));
EXPECT_EQ("00042", str(Format("{0:05}") << 42ul));
EXPECT_EQ("-0042", str(Format("{0:05}") << -42.0));
EXPECT_EQ("-0042", str(Format("{0:05}") << -42.0l));
EXPECT_THROW_MSG(Format("{0:05}") << "abc",
FormatError, "format specifier '0' used with non-numeric type");
EXPECT_THROW_MSG(Format("{0:05}") << L"abc",
FormatError, "format specifier '0' used with non-numeric type");
EXPECT_THROW_MSG(Format("{0:05}") << static_cast<const void*>("abc"),
FormatError, "format specifier '0' used with non-numeric type");
EXPECT_THROW_MSG(Format("{0:05}") << UDT(),
FormatError, "format specifier '0' used with non-numeric type");
}
TEST(FormatterTest, FormatBig) {