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Implement runtime precision.

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This commit is contained in:
Victor Zverovich 2012-12-12 15:21:11 -08:00
parent db306cfb22
commit 363352754c
3 changed files with 181 additions and 46 deletions
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117
format.cc
View File

@ -36,6 +36,7 @@
#include <algorithm>
using std::size_t;
using fmt::Formatter;
#if _MSC_VER
# define snprintf _snprintf
@ -46,21 +47,6 @@ namespace {
// Flags.
enum { PLUS_FLAG = 1, ZERO_FLAG = 2, HEX_PREFIX_FLAG = 4 };
// Throws Exception(message) if format contains '}', otherwise throws
// FormatError reporting unmatched '{'. The idea is that unmatched '{'
// should override other errors.
void ReportError(const char *s, const std::string &message) {
for (int num_open_braces = 1; *s; ++s) {
if (*s == '{') {
++num_open_braces;
} else if (*s == '}') {
if (--num_open_braces == 0)
throw fmt::FormatError(message);
}
}
throw fmt::FormatError("unmatched '{' in format");
}
void ReportUnknownType(char code, const char *type) {
if (std::isprint(code)) {
throw fmt::FormatError(
@ -71,20 +57,6 @@ void ReportUnknownType(char code, const char *type) {
<< static_cast<unsigned>(code) << type));
}
// 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.
ReportError(s, "number is too big in format");
value = new_value;
} while ('0' <= *s && *s <= '9');
return value;
}
// Information about an integer type.
template <typename T>
struct IntTraits {
@ -111,8 +83,23 @@ template <>
struct IsLongDouble<long double> { enum {VALUE = 1}; };
}
// Throws Exception(message) if format contains '}', otherwise throws
// FormatError reporting unmatched '{'. The idea is that unmatched '{'
// should override other errors.
void Formatter::ReportError(const char *s, const std::string &message) const {
for (int num_open_braces = num_open_braces_; *s; ++s) {
if (*s == '{') {
++num_open_braces;
} else if (*s == '}') {
if (--num_open_braces == 0)
throw fmt::FormatError(message);
}
}
throw fmt::FormatError("unmatched '{' in format");
}
template <typename T>
void fmt::Formatter::FormatInt(T value, unsigned flags, int width, char type) {
void Formatter::FormatInt(T value, unsigned flags, int width, char type) {
int size = 0;
char sign = 0;
typedef typename IntTraits<T>::UnsignedType UnsignedType;
@ -189,7 +176,7 @@ void fmt::Formatter::FormatInt(T value, unsigned flags, int width, char type) {
}
template <typename T>
void fmt::Formatter::FormatDouble(
void Formatter::FormatDouble(
T value, unsigned flags, int width, int precision, char type) {
// Check type.
switch (type) {
@ -199,7 +186,10 @@ void fmt::Formatter::FormatDouble(
case 'e': case 'E': case 'f': case 'g': case 'G':
break;
case 'F':
#ifdef _MSC_VER
// MSVC's printf doesn't support 'F'.
type = 'f';
#endif
break;
default:
ReportUnknownType(type, "double");
@ -248,7 +238,30 @@ void fmt::Formatter::FormatDouble(
}
}
void fmt::Formatter::DoFormat() {
// 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 Formatter::ParseUInt(const char *&s) const {
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.
ReportError(s, "number is too big in format");
value = new_value;
} while ('0' <= *s && *s <= '9');
return value;
}
const Formatter::Arg &Formatter::ParseArgIndex(const char *&s) const {
if (*s < '0' || *s > '9')
ReportError(s, "missing argument index in format string");
unsigned arg_index = ParseUInt(s);
if (arg_index >= args_.size())
ReportError(s, "argument index is out of range in format");
return *args_[arg_index];
}
void Formatter::DoFormat() {
const char *start = format_;
format_ = 0;
const char *s = start;
@ -262,15 +275,10 @@ void fmt::Formatter::DoFormat() {
}
if (c == '}')
throw FormatError("unmatched '}' in format");
num_open_braces_= 1;
buffer_.append(start, s - 1);
// Parse argument index.
if (*s < '0' || *s > '9')
ReportError(s, "missing argument index in format string");
unsigned arg_index = ParseUInt(s);
if (arg_index >= args_.size())
ReportError(s, "argument index is out of range in format");
const Arg &arg = *args_[arg_index];
const Arg &arg = ParseArgIndex(s);
unsigned flags = 0;
int width = 0;
@ -312,6 +320,37 @@ void fmt::Formatter::DoFormat() {
if (value > INT_MAX)
ReportError(s, "number is too big in format");
precision = value;
} else if (*s == '{') {
++s;
++num_open_braces_;
const Arg &precision_arg = ParseArgIndex(s);
unsigned long value = 0;
switch (precision_arg.type) {
case INT:
if (precision_arg.int_value < 0)
ReportError(s, "negative precision in format");
value = precision_arg.int_value;
break;
case UINT:
value = precision_arg.uint_value;
break;
case LONG:
if (precision_arg.long_value < 0)
ReportError(s, "negative precision in format");
value = precision_arg.long_value;
break;
case ULONG:
value = precision_arg.ulong_value;
break;
default:
ReportError(s, "precision is not integer");
}
if (value > INT_MAX)
ReportError(s, "number is too big in format");
precision = value;
if (*s++ != '}')
throw FormatError("unmatched '{' in format");
--num_open_braces_;
} else {
ReportError(s, "missing precision in format");
}

8
format.h
View File

@ -244,6 +244,7 @@ class Formatter {
internal::Array<const Arg*, NUM_INLINE_ARGS> args_; // Format arguments.
const char *format_; // Format string.
int num_open_braces_;
friend class internal::ArgInserter;
@ -251,6 +252,8 @@ class Formatter {
args_.push_back(&arg);
}
void ReportError(const char *s, const std::string &message) const;
// Formats an integer.
template <typename T>
void FormatInt(T value, unsigned flags, int width, char type);
@ -264,6 +267,11 @@ class Formatter {
template <typename T>
void FormatCustomArg(const void *arg, int width);
unsigned ParseUInt(const char *&s) const;
// Parses argument index and returns an argument with this index.
const Arg &ParseArgIndex(const char *&s) const;
void DoFormat();
void Format() {

102
format_test.cc
View File

@ -45,13 +45,13 @@ using fmt::FormatError;
GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
if (::testing::internal::ConstCharPtr gtest_msg = "") { \
bool gtest_caught_expected = false; \
std::string actual_message; \
try { \
GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement); \
} \
catch (expected_exception const& e) { \
gtest_caught_expected = true; \
actual_message = e.what(); \
if (std::strcmp(message, e.what()) != 0) \
throw; \
} \
catch (...) { \
gtest_msg.value = \
@ -64,11 +64,6 @@ using fmt::FormatError;
"Expected: " #statement " throws an exception of type " \
#expected_exception ".\n Actual: it throws nothing."; \
goto GTEST_CONCAT_TOKEN_(gtest_label_testthrow_, __LINE__); \
} else if (actual_message != message) {\
gtest_msg.value = \
"Expected: " #statement " throws an exception of type " \
#expected_exception "."; \
goto GTEST_CONCAT_TOKEN_(gtest_label_testthrow_, __LINE__); \
} \
} else \
GTEST_CONCAT_TOKEN_(gtest_label_testthrow_, __LINE__): \
@ -380,6 +375,99 @@ TEST(FormatterTest, Precision) {
FormatError, "precision specifier requires floating-point argument");
}
TEST(FormatterTest, RuntimePrecision) {
char format[256];
if (ULONG_MAX > UINT_MAX) {
std::sprintf(format, "{0:.{%lu", INT_MAX + 1l);
EXPECT_THROW_MSG(Format(format) << 0,
FormatError, "unmatched '{' in format");
std::sprintf(format, "{0:.{%lu}", INT_MAX + 1l);
EXPECT_THROW_MSG(Format(format) << 0,
FormatError, "unmatched '{' in format");
std::sprintf(format, "{0:.{%lu}}", UINT_MAX + 1l);
EXPECT_THROW_MSG(Format(format) << 0,
FormatError, "number is too big in format");
} else {
std::sprintf(format, "{0:.{%u0", UINT_MAX);
EXPECT_THROW_MSG(Format(format) << 0,
FormatError, "unmatched '{' in format");
std::sprintf(format, "{0:.{%u0}", UINT_MAX);
EXPECT_THROW_MSG(Format(format) << 0,
FormatError, "unmatched '{' in format");
std::sprintf(format, "{0:.{%u0}}", UINT_MAX);
EXPECT_THROW_MSG(Format(format) << 0,
FormatError, "number is too big in format");
}
EXPECT_THROW_MSG(Format("{0:.{") << 0,
FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:.{}") << 0,
FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:.{}}") << 0,
FormatError, "missing argument index in format string");
EXPECT_THROW_MSG(Format("{0:.{1}") << 0 << 0,
FormatError, "unmatched '{' in format");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0,
FormatError, "argument index is out of range in format");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << -1,
FormatError, "negative precision in format");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << (INT_MAX + 1u),
FormatError, "number is too big in format");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << -1l,
FormatError, "negative precision in format");
if (sizeof(long) > sizeof(int)) {
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << (INT_MAX + 1l),
FormatError, "number is too big in format");
}
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << (INT_MAX + 1ul),
FormatError, "number is too big in format");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << '0',
FormatError, "precision is not integer");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 0 << 0.0,
FormatError, "precision is not integer");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 42 << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << 42 << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 42u << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << 42u << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 42l << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << 42l << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 42ul << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << 42ul << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_EQ("1.2", str(Format("{0:.{1}}") << 1.2345 << 2));
EXPECT_EQ("1.2", str(Format("{1:.{0}}") << 2 << 1.2345l));
EXPECT_THROW_MSG(Format("{0:.{1}}") << reinterpret_cast<void*>(0xcafe) << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << reinterpret_cast<void*>(0xcafe) << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}}") << 'x' << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << 'x' << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}}") << "str" << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << "str" << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}}") << TestString() << 2,
FormatError, "precision specifier requires floating-point argument");
EXPECT_THROW_MSG(Format("{0:.{1}f}") << TestString() << 2,
FormatError, "precision specifier requires floating-point argument");
}
template <typename T>
void CheckUnknownTypes(
const T &value, const char *types, const char *type_name) {