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Implement formatting of integers.

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This commit is contained in:
Victor Zverovich 2012-12-10 11:08:16 -08:00
parent c5dce1caf9
commit b98b2e9842
3 changed files with 310 additions and 185 deletions
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325
format.cc
View File

@ -5,6 +5,8 @@
#include "format.h" #include "format.h"
#include <stdint.h>
#include <cassert> #include <cassert>
#include <climits> #include <climits>
#include <cstring> #include <cstring>
@ -14,16 +16,16 @@ using std::size_t;
namespace { namespace {
// Flags.
enum { PLUS_FLAG = 1, ZERO_FLAG = 2, HEX_PREFIX_FLAG = 4 };
// Throws Exception(message) if format contains '}', otherwise throws // Throws Exception(message) if format contains '}', otherwise throws
// FormatError reporting unmatched '{'. The idea is that unmatched '{' // FormatError reporting unmatched '{'. The idea is that unmatched '{'
// should override other errors. // should override other errors.
template <typename Exception> void ReportError(const char *s, const std::string &message) {
void Throw(const char *s, const char *message) {
while (*s && *s != '}') while (*s && *s != '}')
++s; ++s;
if (!*s) throw fmt::FormatError(*s ? message : std::string("unmatched '{' in format"));
throw fmt::FormatError("unmatched '{' in format");
throw Exception(message);
} }
// Parses an unsigned integer advancing s to the end of the parsed input. // Parses an unsigned integer advancing s to the end of the parsed input.
@ -34,29 +36,168 @@ unsigned ParseUInt(const char *&s) {
do { do {
unsigned new_value = value * 10 + (*s++ - '0'); unsigned new_value = value * 10 + (*s++ - '0');
if (new_value < value) // Check if value wrapped around. if (new_value < value) // Check if value wrapped around.
Throw<fmt::FormatError>(s, "number is too big in format"); ReportError(s, "number is too big in format");
value = new_value; value = new_value;
} while ('0' <= *s && *s <= '9'); } while ('0' <= *s && *s <= '9');
return value; return value;
} }
// Maps an integer type T to its unsigned counterpart.
template <typename T>
struct GetUnsigned;
template <>
struct GetUnsigned<int> {
typedef unsigned Type;
};
template <>
struct GetUnsigned<unsigned> {
typedef unsigned Type;
};
template <>
struct GetUnsigned<long> {
typedef unsigned long Type;
};
template <>
struct GetUnsigned<unsigned long> {
typedef unsigned long Type;
};
template <typename T>
struct IsLongDouble { enum {VALUE = 0}; };
template <>
struct IsLongDouble<long double> { enum {VALUE = 1}; };
} }
template <typename T> template <typename T>
void fmt::Formatter::FormatBuiltinArg( void fmt::Formatter::FormatInt(T value, unsigned flags, int width, char type) {
const char *format, const T &arg, int width, int precision) { int size = 0;
char sign = 0;
typedef typename GetUnsigned<T>::Type UnsignedType;
UnsignedType abs_value = value;
if (value < 0) {
sign = '-';
++size;
abs_value = -value;
} else if ((flags & PLUS_FLAG) != 0) {
sign = '+';
++size;
}
char fill = (flags & ZERO_FLAG) != 0 ? '0' : ' ';
size_t start = buffer_.size();
char *p = 0;
switch (type) {
case 0: case 'd': {
UnsignedType n = abs_value;
do {
++size;
} while ((n /= 10) != 0);
width = std::max(width, size);
buffer_.resize(buffer_.size() + width, fill);
p = &buffer_.back();
n = abs_value;
do {
*p-- = '0' + (n % 10);
} while ((n /= 10) != 0);
break;
}
case 'x': case 'X': {
UnsignedType n = abs_value;
bool print_prefix = (flags & HEX_PREFIX_FLAG) != 0;
if (print_prefix) size += 2;
do {
++size;
} while ((n >>= 4) != 0);
width = std::max(width, size);
buffer_.resize(buffer_.size() + width, fill);
p = &buffer_.back();
n = abs_value;
const char *digits = type == 'x' ? "0123456789abcdef" : "0123456789ABCDEF";
do {
*p-- = digits[n & 0xf];
} while ((n >>= 4) != 0);
if (print_prefix) {
*p-- = type;
*p-- = '0';
}
break;
}
case 'o': {
UnsignedType n = abs_value;
do {
++size;
} while ((n >>= 3) != 0);
width = std::max(width, size);
buffer_.resize(buffer_.size() + width, fill);
p = &buffer_.back();
n = abs_value;
do {
*p-- = '0' + (n & 7);
} while ((n >>= 3) != 0);
break;
}
default:
throw FormatError(
str(fmt::Format("unknown format code '{0}' for integer") << type));
}
if (sign) {
if ((flags & ZERO_FLAG) != 0)
buffer_[start] = sign;
else
*p = sign;
}
}
template <typename T>
void fmt::Formatter::FormatDouble(
T value, unsigned flags, int width, int precision, char type) {
// Check type.
switch (type) {
case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
break;
default:
// TODO: error
break;
}
// Build format string.
enum { MAX_FORMAT_SIZE = 9}; // longest format: %+0*.*Lg
char format[MAX_FORMAT_SIZE];
char *format_ptr = format;
*format_ptr++ = '%';
if ((flags & PLUS_FLAG) != 0)
*format_ptr++ = '+';
if ((flags & ZERO_FLAG) != 0)
*format_ptr++ = '0';
if (width > 0)
*format_ptr++ = '*';
if (precision >= 0) {
*format_ptr++ = '.';
*format_ptr++ = '*';
}
if (IsLongDouble<T>::VALUE)
*format_ptr++ = 'L';
*format_ptr++ = type ? type : 'g';
*format_ptr = '\0';
// Format using snprintf.
size_t offset = buffer_.size(); size_t offset = buffer_.size();
buffer_.resize(buffer_.capacity()); buffer_.resize(buffer_.capacity());
for (;;) { for (;;) {
size_t size = buffer_.size() - offset; size_t size = buffer_.size() - offset;
int n = 0; int n = 0;
if (width < 0) { if (width <= 0) {
n = precision < 0 ? n = precision < 0 ?
snprintf(&buffer_[offset], size, format, arg) : snprintf(&buffer_[offset], size, format, value) :
snprintf(&buffer_[offset], size, format, precision, arg); snprintf(&buffer_[offset], size, format, precision, value);
} else { } else {
n = precision < 0 ? n = precision < 0 ?
snprintf(&buffer_[offset], size, format, width, arg) : snprintf(&buffer_[offset], size, format, width, value) :
snprintf(&buffer_[offset], size, format, width, precision, arg); snprintf(&buffer_[offset], size, format, width, precision, value);
} }
if (n >= 0 && offset + n < buffer_.size()) { if (n >= 0 && offset + n < buffer_.size()) {
buffer_.resize(offset + n); buffer_.resize(offset + n);
@ -77,92 +218,64 @@ void fmt::Formatter::Format() {
// Parse argument index. // Parse argument index.
if (*s < '0' || *s > '9') if (*s < '0' || *s > '9')
Throw<fmt::FormatError>(s, "missing argument index in format string"); ReportError(s, "missing argument index in format string");
unsigned arg_index = ParseUInt(s); unsigned arg_index = ParseUInt(s);
if (arg_index >= args_.size()) if (arg_index >= args_.size())
Throw<std::out_of_range>(s, "argument index is out of range in format"); ReportError(s, "argument index is out of range in format");
Arg &arg = args_[arg_index]; Arg &arg = args_[arg_index];
enum { MAX_FORMAT_SIZE = 10}; // longest format: %+0-*.*ld unsigned flags = 0;
char arg_format[MAX_FORMAT_SIZE]; int width = 0;
char *arg_format_ptr = arg_format;
*arg_format_ptr++ = '%';
int width = -1;
int precision = -1; int precision = -1;
char type = 0; char type = 0;
bool is_floating_point = false;
if (*s == ':') { if (*s == ':') {
++s; ++s;
if (*s == '+') { if (*s == '+') {
if (arg.type > LAST_NUMERIC_TYPE) { ++s;
Throw<FormatError>(s, if (arg.type > LAST_NUMERIC_TYPE)
"format specifier '+' requires numeric argument"); ReportError(s, "format specifier '+' requires numeric argument");
}
if (arg.type == UINT || arg.type == ULONG) { if (arg.type == UINT || arg.type == ULONG) {
Throw<FormatError>(s, ReportError(s,
"format specifier '+' requires signed argument"); "format specifier '+' requires signed argument");
} }
*arg_format_ptr++ = *s++; flags |= PLUS_FLAG;
} }
if (*s == '0') { if (*s == '0') {
if (arg.type > LAST_NUMERIC_TYPE) { ++s;
Throw<FormatError>(s, if (arg.type > LAST_NUMERIC_TYPE)
"format specifier '0' requires numeric argument"); ReportError(s, "format specifier '0' requires numeric argument");
} flags |= ZERO_FLAG;
*arg_format_ptr++ = *s++;
} }
// Parse width. // Parse width.
if ('0' <= *s && *s <= '9') { if ('0' <= *s && *s <= '9') {
if (arg.type > LAST_NUMERIC_TYPE && arg.type != POINTER)
*arg_format_ptr++ = '-';
*arg_format_ptr++ = '*';
unsigned value = ParseUInt(s); unsigned value = ParseUInt(s);
if (value > INT_MAX) if (value > INT_MAX)
Throw<FormatError>(s, "number is too big in format"); ReportError(s, "number is too big in format");
width = value; width = value;
} }
// Parse precision. // Parse precision.
if (*s == '.') { if (*s == '.') {
*arg_format_ptr++ = '.';
*arg_format_ptr++ = '*';
++s; ++s;
precision = 0; precision = 0;
if ('0' <= *s && *s <= '9') { if ('0' <= *s && *s <= '9') {
unsigned value = ParseUInt(s); unsigned value = ParseUInt(s);
if (value > INT_MAX) if (value > INT_MAX)
Throw<FormatError>(s, "number is too big in format"); ReportError(s, "number is too big in format");
precision = value; precision = value;
} else { } else {
Throw<FormatError>(s, "missing precision in format"); ReportError(s, "missing precision in format");
} }
if (arg.type > LAST_NUMERIC_TYPE || if (arg.type != DOUBLE && arg.type != LONG_DOUBLE) {
(*s == '}' && arg.type != DOUBLE && arg.type != LONG_DOUBLE)) { ReportError(s,
Throw<FormatError>(s, "precision specifier requires floating-point argument");
"precision specifier requires floating-point type");
} }
} }
// Parse type. // Parse type.
if (*s != '}' && *s) { if (*s != '}' && *s)
type = *s++; type = *s++;
if (arg.type <= LAST_NUMERIC_TYPE) {
switch (type) {
case 'd': case 'o': case 'x': case 'X':
// TODO: check that argument is integer
break;
case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
is_floating_point = true;
break;
default:
// TODO: error
break;
}
}
// TODO: check non-numeric types (string, character)
}
} }
if (*s++ != '}') if (*s++ != '}')
@ -172,87 +285,45 @@ void fmt::Formatter::Format() {
// Format argument. // Format argument.
switch (arg.type) { switch (arg.type) {
case INT: case INT:
*arg_format_ptr++ = type ? type : 'd'; FormatInt(arg.int_value, flags, width, type);
*arg_format_ptr = '\0';
if (is_floating_point)
FormatBuiltinArg<double>(arg_format, arg.int_value, width, precision);
else
FormatBuiltinArg(arg_format, arg.int_value, width, precision);
break; break;
case UINT: case UINT:
*arg_format_ptr++ = type ? type : 'u'; FormatInt(arg.uint_value, flags, width, type);
*arg_format_ptr = '\0';
if (is_floating_point)
FormatBuiltinArg<double>(arg_format, arg.uint_value, width, precision);
else
FormatBuiltinArg(arg_format, arg.uint_value, width, precision);
break; break;
case LONG: case LONG:
*arg_format_ptr++ = 'l'; FormatInt(arg.long_value, flags, width, type);
*arg_format_ptr++ = type ? type : 'd';
*arg_format_ptr = '\0';
if (is_floating_point)
FormatBuiltinArg<double>(arg_format, arg.long_value, width, precision);
else
FormatBuiltinArg(arg_format, arg.long_value, width, precision);
break; break;
case ULONG: case ULONG:
*arg_format_ptr++ = 'l'; FormatInt(arg.ulong_value, flags, width, type);
*arg_format_ptr++ = type ? type : 'u';
*arg_format_ptr = '\0';
if (is_floating_point)
FormatBuiltinArg<double>(arg_format, arg.ulong_value, width, precision);
else
FormatBuiltinArg(arg_format, arg.ulong_value, width, precision);
break; break;
case DOUBLE: case DOUBLE:
*arg_format_ptr++ = type ? type : 'g'; FormatDouble(arg.double_value, flags, width, precision, type);
*arg_format_ptr = '\0';
FormatBuiltinArg(arg_format, arg.double_value, width, precision);
break; break;
case LONG_DOUBLE: case LONG_DOUBLE:
*arg_format_ptr++ = 'L'; FormatDouble(arg.long_double_value, flags, width, precision, type);
*arg_format_ptr++ = type ? type : 'g';
*arg_format_ptr = '\0';
FormatBuiltinArg(arg_format, arg.long_double_value, width, precision);
break;
case POINTER:
// TODO: don't allow any type specifiers other than 'p'
*arg_format_ptr++ = 'p';
*arg_format_ptr = '\0';
FormatBuiltinArg(arg_format, arg.pointer_value, width, precision);
break; break;
case CHAR: case CHAR:
// TODO: check if type is 'c' or none // TODO: check if type is 'c' or none
if (width <= 1) { buffer_.reserve(std::max(width, 1));
buffer_.push_back(arg.int_value); buffer_.push_back(arg.int_value);
break; if (width > 1)
} buffer_.resize(buffer_.size() + width - 1, ' ');
*arg_format_ptr++ = 'c';
*arg_format_ptr = '\0';
FormatBuiltinArg(arg_format, arg.int_value, width, precision);
break; break;
case STRING: case STRING: {
// TODO: check if type is 's' or none const char *str = arg.string_value;
if (width == -1 || width <= arg.size) { size_t size = arg.size;
const char *str = arg.string_value; if (size == 0 && *str)
size_t size = arg.size; size = std::strlen(str);
if (size == 0 && *str) buffer_.reserve(buffer_.size() + std::max<size_t>(width, size));
size = std::strlen(str); buffer_.insert(buffer_.end(), str, str + size);
buffer_.reserve(buffer_.size() + size + 1); if (width > size)
buffer_.insert(buffer_.end(), str, str + size); buffer_.resize(buffer_.size() + width - size, ' ');
break;
}
*arg_format_ptr++ = 's';
*arg_format_ptr = '\0';
FormatBuiltinArg(arg_format, arg.string_value, width, precision);
break; break;
case WSTRING: }
// TODO: check if type is 's' or none case POINTER:
*arg_format_ptr++ = 'l'; // TODO: don't allow type specifiers other than 'p'
*arg_format_ptr++ = 's'; FormatInt(reinterpret_cast<uintptr_t>(
*arg_format_ptr = '\0'; arg.pointer_value), HEX_PREFIX_FLAG, width, 'x');
FormatBuiltinArg(arg_format, arg.wstring_value, width, precision);
break; break;
case CUSTOM: case CUSTOM:
// TODO: check if type is 's' or none // TODO: check if type is 's' or none

38
format.h
View File

@ -53,7 +53,6 @@ class Formatter {
struct { struct {
union { union {
const char *string_value; const char *string_value;
const wchar_t *wstring_value;
const void *pointer_value; const void *pointer_value;
}; };
std::size_t size; std::size_t size;
@ -74,7 +73,6 @@ class Formatter {
explicit Arg(char value) : type(CHAR), int_value(value) {} explicit Arg(char value) : type(CHAR), int_value(value) {}
explicit Arg(const char *value, std::size_t size = 0) explicit Arg(const char *value, std::size_t size = 0)
: type(STRING), string_value(value), size(size) {} : type(STRING), string_value(value), size(size) {}
explicit Arg(const wchar_t *value) : type(WSTRING), wstring_value(value) {}
explicit Arg(const void *value) : type(POINTER), pointer_value(value) {} explicit Arg(const void *value) : type(POINTER), pointer_value(value) {}
explicit Arg(const void *value, FormatFunc f) explicit Arg(const void *value, FormatFunc f)
: type(CUSTOM), custom_value(value), format(f) {} : type(CUSTOM), custom_value(value), format(f) {}
@ -92,10 +90,14 @@ class Formatter {
args_.push_back(arg); args_.push_back(arg);
} }
// Formats an argument of a built-in type, such as "int" or "double". // Formats an integer.
template <typename T> template <typename T>
void FormatBuiltinArg( void FormatInt(T value, unsigned flags, int width, char type);
const char *format, const T &arg, int width, int precision);
// Formats a floating point number.
template <typename T>
void FormatDouble(
T value, unsigned flags, int width, int precision, char type);
// Formats an argument of a custom type, such as a user-defined class. // Formats an argument of a custom type, such as a user-defined class.
template <typename T> template <typename T>
@ -199,11 +201,6 @@ class ArgFormatter {
return *this; return *this;
} }
ArgFormatter &operator<<(const wchar_t *value) {
formatter_->Add(Formatter::Arg(value));
return *this;
}
ArgFormatter &operator<<(const std::string &value) { ArgFormatter &operator<<(const std::string &value) {
formatter_->Add(Formatter::Arg(value.c_str(), value.size())); formatter_->Add(Formatter::Arg(value.c_str(), value.size()));
return *this; return *this;
@ -214,10 +211,16 @@ class ArgFormatter {
return *this; return *this;
} }
// This method is not implemented intentionally to disallow output of // This method contains a deliberate error to disallow formatting
// arbitrary pointers. If you want to output a pointer cast it to void*. // arbitrary pointers. If you want to output a pointer cast it to void*.
template <typename T> template <typename T>
ArgFormatter &operator<<(const T *value); ArgFormatter &operator<<(const T *value) {
"Formatting arbitrary pointers is not allowed" = value;
}
// This method is not implemented intentionally to disallow formatting
// wide characters.
ArgFormatter &operator<<(wchar_t value);
template <typename T> template <typename T>
ArgFormatter &operator<<(T *value) { ArgFormatter &operator<<(T *value) {
@ -253,13 +256,10 @@ void Formatter::FormatCustomArg(const void *arg, int width) {
std::ostringstream os; std::ostringstream os;
os << value; os << value;
std::string str(os.str()); std::string str(os.str());
if (width < 0) { buffer_.reserve(buffer_.size() + std::max<std::size_t>(width, str.size()));
// Extra char is reserved for terminating '\0'. buffer_.insert(buffer_.end(), str.begin(), str.end());
buffer_.reserve(buffer_.size() + str.size() + 1); if (width > str.size())
buffer_.insert(buffer_.end(), str.begin(), str.end()); buffer_.resize(buffer_.size() + width - str.size(), ' ');
return;
}
FormatBuiltinArg("%-*s", str.c_str(), width, -1);
} }
inline ArgFormatter Formatter::operator()(const char *format) { inline ArgFormatter Formatter::operator()(const char *format) {

132
format_test.cc
View File

@ -71,7 +71,7 @@ TEST(FormatterTest, NoArgs) {
EXPECT_EQ("test", str(Format("test"))); EXPECT_EQ("test", str(Format("test")));
} }
TEST(FormatterTest, Args) { TEST(FormatterTest, ArgsInDifferentPositions) {
EXPECT_EQ("42", str(Format("{0}") << 42)); EXPECT_EQ("42", str(Format("{0}") << 42));
EXPECT_EQ("before 42", str(Format("before {0}") << 42)); EXPECT_EQ("before 42", str(Format("before {0}") << 42));
EXPECT_EQ("42 after", str(Format("{0} after") << 42)); EXPECT_EQ("42 after", str(Format("{0} after") << 42));
@ -86,13 +86,13 @@ TEST(FormatterTest, ArgErrors) {
EXPECT_THROW_MSG(Format("{}"), FormatError, EXPECT_THROW_MSG(Format("{}"), FormatError,
"missing argument index in format string"); "missing argument index in format string");
EXPECT_THROW_MSG(Format("{0"), FormatError, "unmatched '{' in format"); EXPECT_THROW_MSG(Format("{0"), FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0}"), std::out_of_range, EXPECT_THROW_MSG(Format("{0}"), FormatError,
"argument index is out of range in format"); "argument index is out of range in format");
char format[256]; char format[256];
std::sprintf(format, "{%u", UINT_MAX); std::sprintf(format, "{%u", UINT_MAX);
EXPECT_THROW_MSG(Format(format), FormatError, "unmatched '{' in format"); EXPECT_THROW_MSG(Format(format), FormatError, "unmatched '{' in format");
std::sprintf(format, "{%u}", UINT_MAX); std::sprintf(format, "{%u}", UINT_MAX);
EXPECT_THROW_MSG(Format(format), std::out_of_range, EXPECT_THROW_MSG(Format(format), FormatError,
"argument index is out of range in format"); "argument index is out of range in format");
if (ULONG_MAX > UINT_MAX) { if (ULONG_MAX > UINT_MAX) {
std::sprintf(format, "{%lu", UINT_MAX + 1l); std::sprintf(format, "{%lu", UINT_MAX + 1l);
@ -130,8 +130,6 @@ TEST(FormatterTest, PlusFlag) {
FormatError, "format specifier '+' requires numeric argument"); FormatError, "format specifier '+' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:+}") << "abc", EXPECT_THROW_MSG(Format("{0:+}") << "abc",
FormatError, "format specifier '+' requires numeric argument"); FormatError, "format specifier '+' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:+}") << L"abc",
FormatError, "format specifier '+' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:+}") << reinterpret_cast<void*>(0x42), EXPECT_THROW_MSG(Format("{0:+}") << reinterpret_cast<void*>(0x42),
FormatError, "format specifier '+' requires numeric argument"); FormatError, "format specifier '+' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:+}") << TestString(), EXPECT_THROW_MSG(Format("{0:+}") << TestString(),
@ -152,8 +150,6 @@ TEST(FormatterTest, ZeroFlag) {
FormatError, "format specifier '0' requires numeric argument"); FormatError, "format specifier '0' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:05}") << "abc", EXPECT_THROW_MSG(Format("{0:05}") << "abc",
FormatError, "format specifier '0' requires numeric argument"); FormatError, "format specifier '0' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:05}") << L"abc",
FormatError, "format specifier '0' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:05}") << reinterpret_cast<void*>(0x42), EXPECT_THROW_MSG(Format("{0:05}") << reinterpret_cast<void*>(0x42),
FormatError, "format specifier '0' requires numeric argument"); FormatError, "format specifier '0' requires numeric argument");
EXPECT_THROW_MSG(Format("{0:05}") << TestString(), EXPECT_THROW_MSG(Format("{0:05}") << TestString(),
@ -189,9 +185,8 @@ TEST(FormatterTest, Width) {
EXPECT_EQ(" 0xcafe", EXPECT_EQ(" 0xcafe",
str(Format("{0:10}") << reinterpret_cast<void*>(0xcafe))); str(Format("{0:10}") << reinterpret_cast<void*>(0xcafe)));
EXPECT_EQ("x ", str(Format("{0:11}") << 'x')); EXPECT_EQ("x ", str(Format("{0:11}") << 'x'));
EXPECT_EQ("narrow ", str(Format("{0:12}") << "narrow")); EXPECT_EQ("str ", str(Format("{0:12}") << "str"));
EXPECT_EQ("wide ", str(Format("{0:13}") << L"wide")); EXPECT_EQ("test ", str(Format("{0:13}") << TestString("test")));
EXPECT_EQ("test ", str(Format("{0:14}") << TestString("test")));
} }
TEST(FormatterTest, Precision) { TEST(FormatterTest, Precision) {
@ -224,55 +219,97 @@ TEST(FormatterTest, Precision) {
FormatError, "unmatched '{' in format"); FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:.2}") << 42, EXPECT_THROW_MSG(Format("{0:.2}") << 42,
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_EQ("42.00", str(Format("{0:.2f}") << 42)); EXPECT_THROW_MSG(Format("{0:.2f}") << 42,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2}") << 42u, EXPECT_THROW_MSG(Format("{0:.2}") << 42u,
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_EQ("42.00", str(Format("{0:.2f}") << 42u)); EXPECT_THROW_MSG(Format("{0:.2f}") << 42u,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2}") << 42l, EXPECT_THROW_MSG(Format("{0:.2}") << 42l,
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_EQ("42.00", str(Format("{0:.2f}") << 42l)); EXPECT_THROW_MSG(Format("{0:.2f}") << 42l,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2}") << 42ul, EXPECT_THROW_MSG(Format("{0:.2}") << 42ul,
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_EQ("42.00", str(Format("{0:.2f}") << 42ul)); EXPECT_THROW_MSG(Format("{0:.2f}") << 42ul,
FormatError, "precision specifier requires floating-point argument");
EXPECT_EQ("1.2", str(Format("{0:.2}") << 1.2345)); EXPECT_EQ("1.2", str(Format("{0:.2}") << 1.2345));
EXPECT_EQ("1.2", str(Format("{0:.2}") << 1.2345l)); EXPECT_EQ("1.2", str(Format("{0:.2}") << 1.2345l));
EXPECT_THROW_MSG(Format("{0:.2}") << reinterpret_cast<void*>(0xcafe), EXPECT_THROW_MSG(Format("{0:.2}") << reinterpret_cast<void*>(0xcafe),
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2f}") << reinterpret_cast<void*>(0xcafe), EXPECT_THROW_MSG(Format("{0:.2f}") << reinterpret_cast<void*>(0xcafe),
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2}") << 'x', EXPECT_THROW_MSG(Format("{0:.2}") << 'x',
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2f}") << 'x', EXPECT_THROW_MSG(Format("{0:.2f}") << 'x',
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2}") << "str", EXPECT_THROW_MSG(Format("{0:.2}") << "str",
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2f}") << "str", EXPECT_THROW_MSG(Format("{0:.2f}") << "str",
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2}") << L"str",
FormatError, "precision specifier requires floating-point type");
EXPECT_THROW_MSG(Format("{0:.2f}") << L"str",
FormatError, "precision specifier requires floating-point type");
EXPECT_THROW_MSG(Format("{0:.2}") << TestString(), EXPECT_THROW_MSG(Format("{0:.2}") << TestString(),
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.2f}") << TestString(), EXPECT_THROW_MSG(Format("{0:.2f}") << TestString(),
FormatError, "precision specifier requires floating-point type"); FormatError, "precision specifier requires floating-point argument");
} }
TEST(FormatterTest, FormatInt) { TEST(FormatterTest, Type) {
EXPECT_THROW_MSG(Format("{0:v") << 42,
FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:v}") << 42,
FormatError, "unknown format code 'v' for integer");
}
TEST(FormatterTest, FormatDec) {
EXPECT_EQ("0", str(Format("{0}") << 0));
EXPECT_EQ("42", str(Format("{0}") << 42)); EXPECT_EQ("42", str(Format("{0}") << 42));
EXPECT_EQ("-1234", str(Format("{0}") << -1234)); EXPECT_EQ("42", str(Format("{0:d}") << 42));
std::ostringstream os; EXPECT_EQ("42", str(Format("{0}") << 42u));
os << INT_MIN; EXPECT_EQ("-42", str(Format("{0}") << -42));
EXPECT_EQ(os.str(), str(Format("{0}") << INT_MIN)); EXPECT_EQ("12345", str(Format("{0}") << 12345));
os.str(std::string()); EXPECT_EQ("67890", str(Format("{0}") << 67890));
os << INT_MAX; char buffer[256];
EXPECT_EQ(os.str(), str(Format("{0}") << INT_MAX)); sprintf(buffer, "%d", INT_MIN);
EXPECT_EQ(buffer, str(Format("{0}") << INT_MIN));
sprintf(buffer, "%d", INT_MAX);
EXPECT_EQ(buffer, str(Format("{0}") << INT_MAX));
sprintf(buffer, "%u", UINT_MAX);
EXPECT_EQ(buffer, str(Format("{0}") << UINT_MAX));
sprintf(buffer, "%ld", 0ul - LONG_MIN);
EXPECT_EQ(buffer, str(Format("{0}") << LONG_MIN));
sprintf(buffer, "%ld", LONG_MAX);
EXPECT_EQ(buffer, str(Format("{0}") << LONG_MAX));
sprintf(buffer, "%lu", ULONG_MAX);
EXPECT_EQ(buffer, str(Format("{0}") << ULONG_MAX));
}
TEST(FormatterTest, FormatHex) {
EXPECT_EQ("0", str(Format("{0:x}") << 0));
EXPECT_EQ("42", str(Format("{0:x}") << 0x42));
EXPECT_EQ("42", str(Format("{0:x}") << 0x42u));
EXPECT_EQ("-42", str(Format("{0:x}") << -0x42));
EXPECT_EQ("12345678", str(Format("{0:x}") << 0x12345678));
EXPECT_EQ("90abcdef", str(Format("{0:x}") << 0x90abcdef));
EXPECT_EQ("12345678", str(Format("{0:X}") << 0x12345678));
EXPECT_EQ("90ABCDEF", str(Format("{0:X}") << 0x90ABCDEF));
char buffer[256];
sprintf(buffer, "-%x", 0u - INT_MIN);
EXPECT_EQ(buffer, str(Format("{0:x}") << INT_MIN));
sprintf(buffer, "%x", INT_MAX);
EXPECT_EQ(buffer, str(Format("{0:x}") << INT_MAX));
sprintf(buffer, "%x", UINT_MAX);
EXPECT_EQ(buffer, str(Format("{0:x}") << UINT_MAX));
sprintf(buffer, "-%lx", 0ul - LONG_MIN);
EXPECT_EQ(buffer, str(Format("{0:x}") << LONG_MIN));
sprintf(buffer, "%lx", LONG_MAX);
EXPECT_EQ(buffer, str(Format("{0:x}") << LONG_MAX));
sprintf(buffer, "%lx", ULONG_MAX);
EXPECT_EQ(buffer, str(Format("{0:x}") << ULONG_MAX));
} }
TEST(FormatterTest, FormatChar) { TEST(FormatterTest, FormatChar) {
@ -283,8 +320,25 @@ TEST(FormatterTest, FormatString) {
EXPECT_EQ("test", str(Format("{0}") << std::string("test"))); EXPECT_EQ("test", str(Format("{0}") << std::string("test")));
} }
TEST(FormatterTest, FormatPointer) {
EXPECT_EQ("0x0", str(Format("{0}") << reinterpret_cast<void*>(0)));
}
class Date {
int year_, month_, day_;
public:
Date(int year, int month, int day) : year_(year), month_(month), day_(day) {}
friend std::ostream &operator<<(std::ostream &os, const Date &d) {
os << d.year_ << '-' << d.month_ << '-' << d.day_;
return os;
}
};
TEST(FormatterTest, FormatCustomArg) { TEST(FormatterTest, FormatCustomArg) {
EXPECT_EQ("a string", str(Format("{0}") << TestString("a string"))); EXPECT_EQ("a string", str(Format("{0}") << TestString("a string")));
std::string s = str(fmt::Format("The date is {0}") << Date(2012, 12, 9));
EXPECT_EQ("The date is 2012-12-9", s);
} }
TEST(FormatterTest, FormatStringFromSpeedTest) { TEST(FormatterTest, FormatStringFromSpeedTest) {