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Move formatter methods to the header

Browse Source 
and improve naming consistency
This commit is contained in:
vitaut 2015-12-03 09:38:06 -08:00
parent 6ced4230f4
commit 535dbdd1c8
2 changed files with 567 additions and 580 deletions
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468
format.cc
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@ -52,17 +52,6 @@
using fmt::internal::Arg;
// Check if exceptions are disabled.
#if defined(__GNUC__) && !defined(__EXCEPTIONS)
# define FMT_EXCEPTIONS 0
#endif
#if defined(_MSC_VER) && !_HAS_EXCEPTIONS
# define FMT_EXCEPTIONS 0
#endif
#ifndef FMT_EXCEPTIONS
# define FMT_EXCEPTIONS 1
#endif
#if FMT_EXCEPTIONS
# define FMT_TRY try
# define FMT_CATCH(x) catch (x)
@ -71,14 +60,6 @@ using fmt::internal::Arg;
# define FMT_CATCH(x) if (false)
#endif
#ifndef FMT_THROW
# if FMT_EXCEPTIONS
# define FMT_THROW(x) throw x
# else
# define FMT_THROW(x) assert(false)
# endif
#endif
#ifdef FMT_HEADER_ONLY
# define FMT_FUNC inline
#else
@ -253,50 +234,6 @@ class IsZeroInt : public fmt::internal::ArgVisitor<IsZeroInt, bool> {
bool visit_any_int(T value) { return value == 0; }
};
// 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.
template <typename Char>
int parse_nonnegative_int(const Char *&s) {
assert('0' <= *s && *s <= '9');
unsigned value = 0;
do {
unsigned new_value = value * 10 + (*s++ - '0');
// Check if value wrapped around.
if (new_value < value) {
value = UINT_MAX;
break;
}
value = new_value;
} while ('0' <= *s && *s <= '9');
if (value > INT_MAX)
FMT_THROW(fmt::FormatError("number is too big"));
return value;
}
template <typename Char>
inline bool is_name_start(Char c) {
return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || '_' == c;
}
inline void require_numeric_argument(const Arg &arg, char spec) {
if (arg.type > Arg::LAST_NUMERIC_TYPE) {
std::string message =
fmt::format("format specifier '{}' requires numeric argument", spec);
FMT_THROW(fmt::FormatError(message));
}
}
template <typename Char>
void check_sign(const Char *&s, const Arg &arg) {
char sign = static_cast<char>(*s);
require_numeric_argument(arg, sign);
if (arg.type == Arg::UINT || arg.type == Arg::ULONG_LONG) {
FMT_THROW(fmt::FormatError(fmt::format(
"format specifier '{}' requires signed argument", sign)));
}
++s;
}
// Checks if an argument is a valid printf width specifier and sets
// left alignment if it is negative.
class WidthHandler : public fmt::internal::ArgVisitor<WidthHandler, unsigned> {
@ -407,134 +344,20 @@ class CharConverter : public fmt::internal::ArgVisitor<CharConverter, void> {
namespace internal {
template <typename Impl, typename Char>
class BasicArgFormatter : public ArgVisitor<Impl, void> {
private:
BasicWriter<Char> &writer_;
FormatSpec &spec_;
FMT_DISALLOW_COPY_AND_ASSIGN(BasicArgFormatter);
void write_pointer(const void *p) {
spec_.flags_ = HASH_FLAG;
spec_.type_ = 'x';
writer_.write_int(reinterpret_cast<uintptr_t>(p), spec_);
}
protected:
BasicWriter<Char> &writer() { return writer_; }
FormatSpec &spec() { return spec_; }
void write(bool value) {
const char *str_value = value ? "true" : "false";
Arg::StringValue<char> str = { str_value, strlen(str_value) };
writer_.write_str(str, spec_);
}
void write(const char *value) {
Arg::StringValue<char> str = {value, value != 0 ? strlen(value) : 0};
writer_.write_str(str, spec_);
}
public:
BasicArgFormatter(BasicWriter<Char> &w, FormatSpec &s)
: writer_(w), spec_(s) {}
template <typename T>
void visit_any_int(T value) { writer_.write_int(value, spec_); }
template <typename T>
void visit_any_double(T value) { writer_.write_double(value, spec_); }
void visit_bool(bool value) {
if (spec_.type_)
return visit_any_int(value);
write(value);
}
void visit_char(int value) {
if (spec_.type_ && spec_.type_ != 'c') {
spec_.flags_ |= CHAR_FLAG;
writer_.write_int(value, spec_);
return;
}
if (spec_.align_ == ALIGN_NUMERIC || spec_.flags_ != 0)
FMT_THROW(FormatError("invalid format specifier for char"));
typedef typename BasicWriter<Char>::CharPtr CharPtr;
Char fill = internal::CharTraits<Char>::cast(spec_.fill());
CharPtr out = CharPtr();
const unsigned CHAR_WIDTH = 1;
if (spec_.width_ > CHAR_WIDTH) {
out = writer_.grow_buffer(spec_.width_);
if (spec_.align_ == ALIGN_RIGHT) {
std::fill_n(out, spec_.width_ - CHAR_WIDTH, fill);
out += spec_.width_ - CHAR_WIDTH;
} else if (spec_.align_ == ALIGN_CENTER) {
out = writer_.fill_padding(out, spec_.width_,
internal::check(CHAR_WIDTH), fill);
} else {
std::fill_n(out + CHAR_WIDTH, spec_.width_ - CHAR_WIDTH, fill);
}
} else {
out = writer_.grow_buffer(CHAR_WIDTH);
}
*out = internal::CharTraits<Char>::cast(value);
}
void visit_cstring(const char *value) {
if (spec_.type_ == 'p')
return write_pointer(value);
write(value);
}
void visit_string(Arg::StringValue<char> value) {
writer_.write_str(value, spec_);
}
using ArgVisitor<Impl, void>::visit_wstring;
void visit_wstring(Arg::StringValue<Char> value) {
writer_.write_str(value, spec_);
}
void visit_pointer(const void *value) {
if (spec_.type_ && spec_.type_ != 'p')
report_unknown_type(spec_.type_, "pointer");
write_pointer(value);
}
};
// An argument formatter.
template <typename Char>
class ArgFormatter : public BasicArgFormatter<ArgFormatter<Char>, Char> {
private:
BasicFormatter<Char> &formatter_;
const Char *format_;
public:
ArgFormatter(BasicFormatter<Char> &f, FormatSpec &s, const Char *fmt)
: BasicArgFormatter<ArgFormatter<Char>, Char>(f.writer(), s),
formatter_(f), format_(fmt) {}
void visit_custom(Arg::CustomValue c) {
c.format(&formatter_, c.value, &format_);
}
};
template <typename Char>
class PrintfArgFormatter :
public BasicArgFormatter<PrintfArgFormatter<Char>, Char> {
public ArgFormatterBase<PrintfArgFormatter<Char>, Char> {
void write_null_pointer() {
this->spec().type_ = 0;
this->write("(nil)");
}
typedef BasicArgFormatter<PrintfArgFormatter<Char>, Char> Base;
typedef ArgFormatterBase<PrintfArgFormatter<Char>, Char> Base;
public:
PrintfArgFormatter(BasicWriter<Char> &w, FormatSpec &s)
: BasicArgFormatter<PrintfArgFormatter<Char>, Char>(w, s) {}
: ArgFormatterBase<PrintfArgFormatter<Char>, Char>(w, s) {}
void visit_bool(bool value) {
FormatSpec &fmt_spec = this->spec();
@ -827,68 +650,6 @@ void fmt::internal::FixedBuffer<Char>::grow(std::size_t) {
FMT_THROW(std::runtime_error("buffer overflow"));
}
template <typename Char>
template <typename StrChar>
void fmt::BasicWriter<Char>::write_str(
const Arg::StringValue<StrChar> &s, const FormatSpec &spec) {
// Check if StrChar is convertible to Char.
internal::CharTraits<Char>::convert(StrChar());
if (spec.type_ && spec.type_ != 's')
internal::report_unknown_type(spec.type_, "string");
const StrChar *str_value = s.value;
std::size_t str_size = s.size;
if (str_size == 0) {
if (!str_value) {
FMT_THROW(FormatError("string pointer is null"));
return;
}
}
std::size_t precision = spec.precision_;
if (spec.precision_ >= 0 && precision < str_size)
str_size = spec.precision_;
write_str(str_value, str_size, spec);
}
template <typename Char>
inline Arg fmt::BasicFormatter<Char>::get_arg(
BasicStringRef<Char> arg_name, const char *&error) {
if (check_no_auto_index(error)) {
map_.init(args());
const Arg *arg = map_.find(arg_name);
if (arg)
return *arg;
error = "argument not found";
}
return Arg();
}
template <typename Char>
inline Arg fmt::BasicFormatter<Char>::parse_arg_index(const Char *&s) {
const char *error = 0;
Arg arg = *s < '0' || *s > '9' ?
next_arg(error) : get_arg(parse_nonnegative_int(s), error);
if (error) {
FMT_THROW(FormatError(
*s != '}' && *s != ':' ? "invalid format string" : error));
}
return arg;
}
template <typename Char>
inline Arg fmt::BasicFormatter<Char>::parse_arg_name(const Char *&s) {
assert(is_name_start(*s));
const Char *start = s;
Char c;
do {
c = *++s;
} while (is_name_start(c) || ('0' <= c && c <= '9'));
const char *error = 0;
Arg arg = get_arg(fmt::BasicStringRef<Char>(start, s - start), error);
if (error)
FMT_THROW(fmt::FormatError(error));
return arg;
}
FMT_FUNC Arg fmt::internal::FormatterBase::do_get_arg(
unsigned arg_index, const char *&error) {
Arg arg = args_[arg_index];
@ -904,28 +665,6 @@ FMT_FUNC Arg fmt::internal::FormatterBase::do_get_arg(
return arg;
}
inline Arg fmt::internal::FormatterBase::next_arg(const char *&error) {
if (next_arg_index_ >= 0)
return do_get_arg(next_arg_index_++, error);
error = "cannot switch from manual to automatic argument indexing";
return Arg();
}
inline bool fmt::internal::FormatterBase::check_no_auto_index(
const char *&error) {
if (next_arg_index_ > 0) {
error = "cannot switch from automatic to manual argument indexing";
return false;
}
next_arg_index_ = -1;
return true;
}
inline Arg fmt::internal::FormatterBase::get_arg(
unsigned arg_index, const char *&error) {
return check_no_auto_index(error) ? do_get_arg(arg_index, error) : Arg();
}
template <typename Char>
void fmt::internal::PrintfFormatter<Char>::parse_flags(
FormatSpec &spec, const Char *&s) {
@ -1098,196 +837,6 @@ void fmt::internal::PrintfFormatter<Char>::format(
write(writer, start, s);
}
template <typename Char>
const Char *fmt::BasicFormatter<Char>::format(
const Char *&format_str, const Arg &arg) {
const Char *s = format_str;
FormatSpec spec;
if (*s == ':') {
if (arg.type == Arg::CUSTOM) {
arg.custom.format(this, arg.custom.value, &s);
return s;
}
++s;
// Parse fill and alignment.
if (Char c = *s) {
const Char *p = s + 1;
spec.align_ = ALIGN_DEFAULT;
do {
switch (*p) {
case '<':
spec.align_ = ALIGN_LEFT;
break;
case '>':
spec.align_ = ALIGN_RIGHT;
break;
case '=':
spec.align_ = ALIGN_NUMERIC;
break;
case '^':
spec.align_ = ALIGN_CENTER;
break;
}
if (spec.align_ != ALIGN_DEFAULT) {
if (p != s) {
if (c == '}') break;
if (c == '{')
FMT_THROW(FormatError("invalid fill character '{'"));
s += 2;
spec.fill_ = c;
} else ++s;
if (spec.align_ == ALIGN_NUMERIC)
require_numeric_argument(arg, '=');
break;
}
} while (--p >= s);
}
// Parse sign.
switch (*s) {
case '+':
check_sign(s, arg);
spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
break;
case '-':
check_sign(s, arg);
spec.flags_ |= MINUS_FLAG;
break;
case ' ':
check_sign(s, arg);
spec.flags_ |= SIGN_FLAG;
break;
}
if (*s == '#') {
require_numeric_argument(arg, '#');
spec.flags_ |= HASH_FLAG;
++s;
}
// Parse zero flag.
if (*s == '0') {
require_numeric_argument(arg, '0');
spec.align_ = ALIGN_NUMERIC;
spec.fill_ = '0';
++s;
}
// Parse width.
if ('0' <= *s && *s <= '9') {
spec.width_ = parse_nonnegative_int(s);
} else if (*s == '{') {
++s;
Arg width_arg = is_name_start(*s) ?
parse_arg_name(s) : parse_arg_index(s);
if (*s++ != '}')
FMT_THROW(FormatError("invalid format string"));
ULongLong value = 0;
switch (width_arg.type) {
case Arg::INT:
if (width_arg.int_value < 0)
FMT_THROW(FormatError("negative width"));
value = width_arg.int_value;
break;
case Arg::UINT:
value = width_arg.uint_value;
break;
case Arg::LONG_LONG:
if (width_arg.long_long_value < 0)
FMT_THROW(FormatError("negative width"));
value = width_arg.long_long_value;
break;
case Arg::ULONG_LONG:
value = width_arg.ulong_long_value;
break;
default:
FMT_THROW(FormatError("width is not integer"));
}
if (value > INT_MAX)
FMT_THROW(FormatError("number is too big"));
spec.width_ = static_cast<int>(value);
}
// Parse precision.
if (*s == '.') {
++s;
spec.precision_ = 0;
if ('0' <= *s && *s <= '9') {
spec.precision_ = parse_nonnegative_int(s);
} else if (*s == '{') {
++s;
Arg precision_arg =
is_name_start(*s) ? parse_arg_name(s) : parse_arg_index(s);
if (*s++ != '}')
FMT_THROW(FormatError("invalid format string"));
ULongLong value = 0;
switch (precision_arg.type) {
case Arg::INT:
if (precision_arg.int_value < 0)
FMT_THROW(FormatError("negative precision"));
value = precision_arg.int_value;
break;
case Arg::UINT:
value = precision_arg.uint_value;
break;
case Arg::LONG_LONG:
if (precision_arg.long_long_value < 0)
FMT_THROW(FormatError("negative precision"));
value = precision_arg.long_long_value;
break;
case Arg::ULONG_LONG:
value = precision_arg.ulong_long_value;
break;
default:
FMT_THROW(FormatError("precision is not integer"));
}
if (value > INT_MAX)
FMT_THROW(FormatError("number is too big"));
spec.precision_ = static_cast<int>(value);
} else {
FMT_THROW(FormatError("missing precision specifier"));
}
if (arg.type <= Arg::LAST_INTEGER_TYPE || arg.type == Arg::POINTER) {
FMT_THROW(FormatError(
fmt::format("precision not allowed in {} format specifier",
arg.type == Arg::POINTER ? "pointer" : "integer")));
}
}
// Parse type.
if (*s != '}' && *s)
spec.type_ = static_cast<char>(*s++);
}
if (*s++ != '}')
FMT_THROW(FormatError("missing '}' in format string"));
// Format argument.
internal::ArgFormatter<Char>(*this, spec, s - 1).visit(arg);
return s;
}
template <typename Char>
void fmt::BasicFormatter<Char>::format(BasicCStringRef<Char> format_str) {
const Char *s = format_str.c_str();
const Char *start = s;
while (*s) {
Char c = *s++;
if (c != '{' && c != '}') continue;
if (*s == c) {
write(writer_, start, s);
start = ++s;
continue;
}
if (c == '}')
FMT_THROW(FormatError("unmatched '}' in format string"));
write(writer_, start, s - 1);
Arg arg = is_name_start(*s) ? parse_arg_name(s) : parse_arg_index(s);
start = s = format(s, arg);
}
write(writer_, start, s);
}
FMT_FUNC void fmt::report_system_error(
int error_code, fmt::StringRef message) FMT_NOEXCEPT {
// 'fmt::' is for bcc32.
@ -1341,10 +890,7 @@ template struct fmt::internal::BasicData<void>;
template void fmt::internal::FixedBuffer<char>::grow(std::size_t);
template const char *fmt::BasicFormatter<char>::format(
const char *&format_str, const fmt::internal::Arg &arg);
template void fmt::BasicFormatter<char>::format(CStringRef format);
template void fmt::internal::ArgMap<char>::init(const fmt::ArgList &args);
template void fmt::internal::PrintfFormatter<char>::format(
BasicWriter<char> &writer, CStringRef format);
@ -1361,11 +907,7 @@ template int fmt::internal::CharTraits<char>::format_float(
template void fmt::internal::FixedBuffer<wchar_t>::grow(std::size_t);
template const wchar_t *fmt::BasicFormatter<wchar_t>::format(
const wchar_t *&format_str, const fmt::internal::Arg &arg);
template void fmt::BasicFormatter<wchar_t>::format(
BasicCStringRef<wchar_t> format);
template void fmt::internal::ArgMap<wchar_t>::init(const fmt::ArgList &args);
template void fmt::internal::PrintfFormatter<wchar_t>::format(
BasicWriter<wchar_t> &writer, WCStringRef format);

679
format.h
View File

@ -39,6 +39,7 @@ typedef long long intmax_t;
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <limits>
#include <stdexcept>
@ -188,6 +189,25 @@ inline uint32_t clzll(uint64_t x) {
# endif
#endif
// Check if exceptions are disabled.
#if defined(__GNUC__) && !defined(__EXCEPTIONS)
# define FMT_EXCEPTIONS 0
#endif
#if defined(_MSC_VER) && !_HAS_EXCEPTIONS
# define FMT_EXCEPTIONS 0
#endif
#ifndef FMT_EXCEPTIONS
# define FMT_EXCEPTIONS 1
#endif
#ifndef FMT_THROW
# if FMT_EXCEPTIONS
# define FMT_THROW(x) throw x
# else
# define FMT_THROW(x) assert(false)
# endif
#endif
// A macro to disallow the copy constructor and operator= functions
// This should be used in the private: declarations for a class
#ifndef FMT_USE_DELETED_FUNCTIONS
@ -384,7 +404,7 @@ class BasicStringRef {
// Lexicographically compare this string reference to other.
int compare(BasicStringRef other) const {
std::size_t size = std::min(size_, other.size_);
std::size_t size = (std::min)(size_, other.size_);
int result = std::char_traits<Char>::compare(data_, other.data_, size);
if (result == 0)
result = size_ == other.size_ ? 0 : (size_ < other.size_ ? -1 : 1);
@ -1312,9 +1332,6 @@ class RuntimeError : public std::runtime_error {
RuntimeError() : std::runtime_error("") {}
};
template <typename Impl, typename Char>
class BasicArgFormatter;
template <typename Char>
class PrintfArgFormatter;
@ -1386,114 +1403,6 @@ class ArgList {
}
};
struct FormatSpec;
namespace internal {
template <typename Char>
class ArgMap {
private:
typedef std::map<fmt::BasicStringRef<Char>, internal::Arg> MapType;
typedef typename MapType::value_type Pair;
MapType map_;
public:
void init(const ArgList &args);
const internal::Arg* find(const fmt::BasicStringRef<Char> &name) const {
typename MapType::const_iterator it = map_.find(name);
return it != map_.end() ? &it->second : 0;
}
};
class FormatterBase {
private:
ArgList args_;
int next_arg_index_;
// Returns the argument with specified index.
Arg do_get_arg(unsigned arg_index, const char *&error);
protected:
const ArgList &args() const { return args_; }
explicit FormatterBase(const ArgList &args) {
args_ = args;
next_arg_index_ = 0;
}
// Returns the next argument.
Arg next_arg(const char *&error);
// Checks if manual indexing is used and returns the argument with
// specified index.
Arg get_arg(unsigned arg_index, const char *&error);
bool check_no_auto_index(const char *&error);
template <typename Char>
void write(BasicWriter<Char> &w, const Char *start, const Char *end) {
if (start != end)
w << BasicStringRef<Char>(start, end - start);
}
};
// A printf formatter.
template <typename Char>
class PrintfFormatter : private FormatterBase {
private:
void parse_flags(FormatSpec &spec, const Char *&s);
// Returns the argument with specified index or, if arg_index is equal
// to the maximum unsigned value, the next argument.
Arg get_arg(const Char *s,
unsigned arg_index = (std::numeric_limits<unsigned>::max)());
// Parses argument index, flags and width and returns the argument index.
unsigned parse_header(const Char *&s, FormatSpec &spec);
public:
explicit PrintfFormatter(const ArgList &args) : FormatterBase(args) {}
void format(BasicWriter<Char> &writer, BasicCStringRef<Char> format_str);
};
} // namespace internal
// A formatter.
template <typename CharType>
class BasicFormatter : private internal::FormatterBase {
public:
typedef CharType Char;
private:
BasicWriter<Char> &writer_;
internal::ArgMap<Char> map_;
FMT_DISALLOW_COPY_AND_ASSIGN(BasicFormatter);
using internal::FormatterBase::get_arg;
// Checks if manual indexing is used and returns the argument with
// specified name.
internal::Arg get_arg(BasicStringRef<Char> arg_name, const char *&error);
// Parses argument index and returns corresponding argument.
internal::Arg parse_arg_index(const Char *&s);
// Parses argument name and returns corresponding argument.
internal::Arg parse_arg_name(const Char *&s);
public:
BasicFormatter(const ArgList &args, BasicWriter<Char> &w)
: internal::FormatterBase(args), writer_(w) {}
BasicWriter<Char> &writer() { return writer_; }
void format(BasicCStringRef<Char> format_str);
const Char *format(const Char *&format_str, const internal::Arg &arg);
};
enum Alignment {
ALIGN_DEFAULT, ALIGN_LEFT, ALIGN_RIGHT, ALIGN_CENTER, ALIGN_NUMERIC
};
@ -1715,6 +1624,242 @@ inline StrFormatSpec<wchar_t> pad(
return StrFormatSpec<wchar_t>(str, width, fill);
}
namespace internal {
template <typename Char>
class ArgMap {
private:
typedef std::map<fmt::BasicStringRef<Char>, internal::Arg> MapType;
typedef typename MapType::value_type Pair;
MapType map_;
public:
void init(const ArgList &args);
const internal::Arg* find(const fmt::BasicStringRef<Char> &name) const {
typename MapType::const_iterator it = map_.find(name);
return it != map_.end() ? &it->second : 0;
}
};
template <typename Impl, typename Char>
class ArgFormatterBase : public ArgVisitor<Impl, void> {
private:
BasicWriter<Char> &writer_;
FormatSpec &spec_;
FMT_DISALLOW_COPY_AND_ASSIGN(ArgFormatterBase);
void write_pointer(const void *p) {
spec_.flags_ = HASH_FLAG;
spec_.type_ = 'x';
writer_.write_int(reinterpret_cast<uintptr_t>(p), spec_);
}
protected:
BasicWriter<Char> &writer() { return writer_; }
FormatSpec &spec() { return spec_; }
void write(bool value) {
const char *str_value = value ? "true" : "false";
Arg::StringValue<char> str = { str_value, std::strlen(str_value) };
writer_.write_str(str, spec_);
}
void write(const char *value) {
Arg::StringValue<char> str = {value, value != 0 ? std::strlen(value) : 0};
writer_.write_str(str, spec_);
}
public:
ArgFormatterBase(BasicWriter<Char> &w, FormatSpec &s)
: writer_(w), spec_(s) {}
template <typename T>
void visit_any_int(T value) { writer_.write_int(value, spec_); }
template <typename T>
void visit_any_double(T value) { writer_.write_double(value, spec_); }
void visit_bool(bool value) {
if (spec_.type_)
return visit_any_int(value);
write(value);
}
void visit_char(int value) {
if (spec_.type_ && spec_.type_ != 'c') {
spec_.flags_ |= CHAR_FLAG;
writer_.write_int(value, spec_);
return;
}
if (spec_.align_ == ALIGN_NUMERIC || spec_.flags_ != 0)
FMT_THROW(FormatError("invalid format specifier for char"));
typedef typename BasicWriter<Char>::CharPtr CharPtr;
Char fill = internal::CharTraits<Char>::cast(spec_.fill());
CharPtr out = CharPtr();
const unsigned CHAR_WIDTH = 1;
if (spec_.width_ > CHAR_WIDTH) {
out = writer_.grow_buffer(spec_.width_);
if (spec_.align_ == ALIGN_RIGHT) {
std::fill_n(out, spec_.width_ - CHAR_WIDTH, fill);
out += spec_.width_ - CHAR_WIDTH;
} else if (spec_.align_ == ALIGN_CENTER) {
out = writer_.fill_padding(out, spec_.width_,
internal::check(CHAR_WIDTH), fill);
} else {
std::fill_n(out + CHAR_WIDTH, spec_.width_ - CHAR_WIDTH, fill);
}
} else {
out = writer_.grow_buffer(CHAR_WIDTH);
}
*out = internal::CharTraits<Char>::cast(value);
}
void visit_cstring(const char *value) {
if (spec_.type_ == 'p')
return write_pointer(value);
write(value);
}
void visit_string(Arg::StringValue<char> value) {
writer_.write_str(value, spec_);
}
using ArgVisitor<Impl, void>::visit_wstring;
void visit_wstring(Arg::StringValue<Char> value) {
writer_.write_str(value, spec_);
}
void visit_pointer(const void *value) {
if (spec_.type_ && spec_.type_ != 'p')
report_unknown_type(spec_.type_, "pointer");
write_pointer(value);
}
};
// An argument formatter.
template <typename Char>
class BasicArgFormatter :
public ArgFormatterBase<BasicArgFormatter<Char>, Char> {
private:
BasicFormatter<Char> &formatter_;
const Char *format_;
public:
BasicArgFormatter(BasicFormatter<Char> &f, FormatSpec &s, const Char *fmt)
: ArgFormatterBase<BasicArgFormatter<Char>, Char>(f.writer(), s),
formatter_(f), format_(fmt) {}
void visit_custom(Arg::CustomValue c) {
c.format(&formatter_, c.value, &format_);
}
};
class FormatterBase {
private:
ArgList args_;
int next_arg_index_;
// Returns the argument with specified index.
Arg do_get_arg(unsigned arg_index, const char *&error);
protected:
const ArgList &args() const { return args_; }
explicit FormatterBase(const ArgList &args) {
args_ = args;
next_arg_index_ = 0;
}
// Returns the next argument.
Arg next_arg(const char *&error) {
if (next_arg_index_ >= 0)
return do_get_arg(next_arg_index_++, error);
error = "cannot switch from manual to automatic argument indexing";
return Arg();
}
// Checks if manual indexing is used and returns the argument with
// specified index.
Arg get_arg(unsigned arg_index, const char *&error) {
return check_no_auto_index(error) ? do_get_arg(arg_index, error) : Arg();
}
bool check_no_auto_index(const char *&error) {
if (next_arg_index_ > 0) {
error = "cannot switch from automatic to manual argument indexing";
return false;
}
next_arg_index_ = -1;
return true;
}
template <typename Char>
void write(BasicWriter<Char> &w, const Char *start, const Char *end) {
if (start != end)
w << BasicStringRef<Char>(start, end - start);
}
};
// A printf formatter.
template <typename Char>
class PrintfFormatter : private FormatterBase {
private:
void parse_flags(FormatSpec &spec, const Char *&s);
// Returns the argument with specified index or, if arg_index is equal
// to the maximum unsigned value, the next argument.
Arg get_arg(const Char *s,
unsigned arg_index = (std::numeric_limits<unsigned>::max)());
// Parses argument index, flags and width and returns the argument index.
unsigned parse_header(const Char *&s, FormatSpec &spec);
public:
explicit PrintfFormatter(const ArgList &args) : FormatterBase(args) {}
void format(BasicWriter<Char> &writer, BasicCStringRef<Char> format_str);
};
} // namespace internal
// A formatter.
template <typename CharType>
class BasicFormatter : private internal::FormatterBase {
public:
typedef CharType Char;
private:
BasicWriter<Char> &writer_;
internal::ArgMap<Char> map_;
FMT_DISALLOW_COPY_AND_ASSIGN(BasicFormatter);
using internal::FormatterBase::get_arg;
// Checks if manual indexing is used and returns the argument with
// specified name.
internal::Arg get_arg(BasicStringRef<Char> arg_name, const char *&error);
// Parses argument index and returns corresponding argument.
internal::Arg parse_arg_index(const Char *&s);
// Parses argument name and returns corresponding argument.
internal::Arg parse_arg_name(const Char *&s);
public:
BasicFormatter(const ArgList &args, BasicWriter<Char> &w)
: internal::FormatterBase(args), writer_(w) {}
BasicWriter<Char> &writer() { return writer_; }
void format(BasicCStringRef<Char> format_str);
const Char *format(const Char *&format_str, const internal::Arg &arg);
};
// Generates a comma-separated list with results of applying f to
// numbers 0..n-1.
# define FMT_GEN(n, f) FMT_GEN##n(f)
@ -2092,12 +2237,11 @@ class BasicWriter {
// Writes a formatted string.
template <typename StrChar>
CharPtr write_str(
const StrChar *s, std::size_t size, const AlignSpec &spec);
CharPtr write_str(const StrChar *s, std::size_t size, const AlignSpec &spec);
template <typename StrChar>
void write_str(
const internal::Arg::StringValue<StrChar> &str, const FormatSpec &spec);
void write_str(const internal::Arg::StringValue<StrChar> &str,
const FormatSpec &spec);
// This following methods are private to disallow writing wide characters
// and strings to a char stream. If you want to print a wide string as a
@ -2117,7 +2261,7 @@ class BasicWriter {
void append_float_length(Char *&, T) {}
template <typename Impl, typename Char_>
friend class internal::BasicArgFormatter;
friend class internal::ArgFormatterBase;
friend class internal::PrintfArgFormatter<Char>;
@ -2312,6 +2456,28 @@ typename BasicWriter<Char>::CharPtr BasicWriter<Char>::write_str(
return out;
}
template <typename Char>
template <typename StrChar>
void BasicWriter<Char>::write_str(
const internal::Arg::StringValue<StrChar> &s, const FormatSpec &spec) {
// Check if StrChar is convertible to Char.
internal::CharTraits<Char>::convert(StrChar());
if (spec.type_ && spec.type_ != 's')
internal::report_unknown_type(spec.type_, "string");
const StrChar *str_value = s.value;
std::size_t str_size = s.size;
if (str_size == 0) {
if (!str_value) {
FMT_THROW(FormatError("string pointer is null"));
return;
}
}
std::size_t precision = spec.precision_;
if (spec.precision_ >= 0 && precision < str_size)
str_size = spec.precision_;
write_str(str_value, str_size, spec);
}
template <typename Char>
typename BasicWriter<Char>::CharPtr
BasicWriter<Char>::fill_padding(
@ -3195,6 +3361,285 @@ FMT_VARIADIC(int, fprintf, std::FILE *, CStringRef)
void print(std::ostream &os, CStringRef format_str, ArgList args);
FMT_VARIADIC(void, print, std::ostream &, CStringRef)
#endif
namespace internal {
template <typename Char>
inline bool is_name_start(Char c) {
return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || '_' == c;
}
// 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.
template <typename Char>
int parse_nonnegative_int(const Char *&s) {
assert('0' <= *s && *s <= '9');
unsigned value = 0;
do {
unsigned new_value = value * 10 + (*s++ - '0');
// Check if value wrapped around.
if (new_value < value) {
value = (std::numeric_limits<unsigned>::max)();
break;
}
value = new_value;
} while ('0' <= *s && *s <= '9');
if (value > (std::numeric_limits<int>::max)())
FMT_THROW(FormatError("number is too big"));
return value;
}
inline void require_numeric_argument(const Arg &arg, char spec) {
if (arg.type > Arg::LAST_NUMERIC_TYPE) {
std::string message =
fmt::format("format specifier '{}' requires numeric argument", spec);
FMT_THROW(fmt::FormatError(message));
}
}
template <typename Char>
void check_sign(const Char *&s, const Arg &arg) {
char sign = static_cast<char>(*s);
require_numeric_argument(arg, sign);
if (arg.type == Arg::UINT || arg.type == Arg::ULONG_LONG) {
FMT_THROW(FormatError(fmt::format(
"format specifier '{}' requires signed argument", sign)));
}
++s;
}
} // namespace internal
template <typename Char>
inline internal::Arg BasicFormatter<Char>::get_arg(
BasicStringRef<Char> arg_name, const char *&error) {
if (check_no_auto_index(error)) {
map_.init(args());
const internal::Arg *arg = map_.find(arg_name);
if (arg)
return *arg;
error = "argument not found";
}
return internal::Arg();
}
template <typename Char>
inline internal::Arg BasicFormatter<Char>::parse_arg_index(const Char *&s) {
const char *error = 0;
internal::Arg arg = *s < '0' || *s > '9' ?
next_arg(error) : get_arg(internal::parse_nonnegative_int(s), error);
if (error) {
FMT_THROW(FormatError(
*s != '}' && *s != ':' ? "invalid format string" : error));
}
return arg;
}
template <typename Char>
inline internal::Arg BasicFormatter<Char>::parse_arg_name(const Char *&s) {
assert(internal::is_name_start(*s));
const Char *start = s;
Char c;
do {
c = *++s;
} while (internal::is_name_start(c) || ('0' <= c && c <= '9'));
const char *error = 0;
internal::Arg arg = get_arg(BasicStringRef<Char>(start, s - start), error);
if (error)
FMT_THROW(FormatError(error));
return arg;
}
// Should be after FormatSpec
template <typename Char>
const Char *BasicFormatter<Char>::format(
const Char *&format_str, const internal::Arg &arg) {
using internal::Arg;
const Char *s = format_str;
FormatSpec spec;
if (*s == ':') {
if (arg.type == Arg::CUSTOM) {
arg.custom.format(this, arg.custom.value, &s);
return s;
}
++s;
// Parse fill and alignment.
if (Char c = *s) {
const Char *p = s + 1;
spec.align_ = ALIGN_DEFAULT;
do {
switch (*p) {
case '<':
spec.align_ = ALIGN_LEFT;
break;
case '>':
spec.align_ = ALIGN_RIGHT;
break;
case '=':
spec.align_ = ALIGN_NUMERIC;
break;
case '^':
spec.align_ = ALIGN_CENTER;
break;
}
if (spec.align_ != ALIGN_DEFAULT) {
if (p != s) {
if (c == '}') break;
if (c == '{')
FMT_THROW(FormatError("invalid fill character '{'"));
s += 2;
spec.fill_ = c;
} else ++s;
if (spec.align_ == ALIGN_NUMERIC)
require_numeric_argument(arg, '=');
break;
}
} while (--p >= s);
}
// Parse sign.
switch (*s) {
case '+':
check_sign(s, arg);
spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
break;
case '-':
check_sign(s, arg);
spec.flags_ |= MINUS_FLAG;
break;
case ' ':
check_sign(s, arg);
spec.flags_ |= SIGN_FLAG;
break;
}
if (*s == '#') {
require_numeric_argument(arg, '#');
spec.flags_ |= HASH_FLAG;
++s;
}
// Parse zero flag.
if (*s == '0') {
require_numeric_argument(arg, '0');
spec.align_ = ALIGN_NUMERIC;
spec.fill_ = '0';
++s;
}
// Parse width.
if ('0' <= *s && *s <= '9') {
spec.width_ = internal::parse_nonnegative_int(s);
} else if (*s == '{') {
++s;
Arg width_arg = internal::is_name_start(*s) ?
parse_arg_name(s) : parse_arg_index(s);
if (*s++ != '}')
FMT_THROW(FormatError("invalid format string"));
ULongLong value = 0;
switch (width_arg.type) {
case Arg::INT:
if (width_arg.int_value < 0)
FMT_THROW(FormatError("negative width"));
value = width_arg.int_value;
break;
case Arg::UINT:
value = width_arg.uint_value;
break;
case Arg::LONG_LONG:
if (width_arg.long_long_value < 0)
FMT_THROW(FormatError("negative width"));
value = width_arg.long_long_value;
break;
case Arg::ULONG_LONG:
value = width_arg.ulong_long_value;
break;
default:
FMT_THROW(FormatError("width is not integer"));
}
if (value > (std::numeric_limits<int>::max)())
FMT_THROW(FormatError("number is too big"));
spec.width_ = static_cast<int>(value);
}
// Parse precision.
if (*s == '.') {
++s;
spec.precision_ = 0;
if ('0' <= *s && *s <= '9') {
spec.precision_ = internal::parse_nonnegative_int(s);
} else if (*s == '{') {
++s;
Arg precision_arg = internal::is_name_start(*s) ?
parse_arg_name(s) : parse_arg_index(s);
if (*s++ != '}')
FMT_THROW(FormatError("invalid format string"));
ULongLong value = 0;
switch (precision_arg.type) {
case Arg::INT:
if (precision_arg.int_value < 0)
FMT_THROW(FormatError("negative precision"));
value = precision_arg.int_value;
break;
case Arg::UINT:
value = precision_arg.uint_value;
break;
case Arg::LONG_LONG:
if (precision_arg.long_long_value < 0)
FMT_THROW(FormatError("negative precision"));
value = precision_arg.long_long_value;
break;
case Arg::ULONG_LONG:
value = precision_arg.ulong_long_value;
break;
default:
FMT_THROW(FormatError("precision is not integer"));
}
if (value > (std::numeric_limits<int>::max)())
FMT_THROW(FormatError("number is too big"));
spec.precision_ = static_cast<int>(value);
} else {
FMT_THROW(FormatError("missing precision specifier"));
}
if (arg.type <= Arg::LAST_INTEGER_TYPE || arg.type == Arg::POINTER) {
FMT_THROW(FormatError(
fmt::format("precision not allowed in {} format specifier",
arg.type == Arg::POINTER ? "pointer" : "integer")));
}
}
// Parse type.
if (*s != '}' && *s)
spec.type_ = static_cast<char>(*s++);
}
if (*s++ != '}')
FMT_THROW(FormatError("missing '}' in format string"));
// Format argument.
internal::BasicArgFormatter<Char>(*this, spec, s - 1).visit(arg);
return s;
}
template <typename Char>
void BasicFormatter<Char>::format(BasicCStringRef<Char> format_str) {
const Char *s = format_str.c_str();
const Char *start = s;
while (*s) {
Char c = *s++;
if (c != '{' && c != '}') continue;
if (*s == c) {
write(writer_, start, s);
start = ++s;
continue;
}
if (c == '}')
FMT_THROW(FormatError("unmatched '}' in format string"));
write(writer_, start, s - 1);
internal::Arg arg = internal::is_name_start(*s) ?
parse_arg_name(s) : parse_arg_index(s);
start = s = format(s, arg);
}
write(writer_, start, s);
}
} // namespace fmt
#if FMT_USE_USER_DEFINED_LITERALS