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Merge pull request #450 from nlohmann/TurpentineDistillery-feature/locale_independent_str_to_num

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TurpentineDistillery feature/locale independent str to num
This commit is contained in:
Niels Lohmann 2017-02-14 07:18:35 +01:00 committed by GitHub
commit 22b9a301d6
6 changed files with 634 additions and 364 deletions
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2
Makefile
View file

@ -94,7 +94,7 @@ cppcheck:
# run clang sanitize (we are overrding the CXXFLAGS provided by travis in order to use gcc's libstdc++)
clang_sanitize: clean
CXX=clang++ CXXFLAGS="-g -O2 -fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer" $(MAKE)
CXX=clang++ CXXFLAGS="-g -O2 -fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer" $(MAKE) check
##########################################################################

553
src/json.hpp
View file

@ -9444,7 +9444,9 @@ class basic_json
literal_false, ///< the `false` literal
literal_null, ///< the `null` literal
value_string, ///< a string -- use get_string() for actual value
value_number, ///< a number -- use get_number() for actual value
value_unsigned, ///< an unsigned integer -- use get_number() for actual value
value_integer, ///< a signed integer -- use get_number() for actual value
value_float, ///< an floating point number -- use get_number() for actual value
begin_array, ///< the character for array begin `[`
begin_object, ///< the character for object begin `{`
end_array, ///< the character for array end `]`
@ -9596,7 +9598,9 @@ class basic_json
return "null literal";
case token_type::value_string:
return "string literal";
case token_type::value_number:
case lexer::token_type::value_unsigned:
case lexer::token_type::value_integer:
case lexer::token_type::value_float:
return "number literal";
case token_type::begin_array:
return "'['";
@ -9869,11 +9873,11 @@ basic_json_parser_12:
}
if (yych <= '0')
{
goto basic_json_parser_13;
goto basic_json_parser_43;
}
if (yych <= '9')
{
goto basic_json_parser_15;
goto basic_json_parser_45;
}
goto basic_json_parser_5;
basic_json_parser_13:
@ -9883,23 +9887,23 @@ basic_json_parser_13:
{
if (yych == '.')
{
goto basic_json_parser_43;
goto basic_json_parser_47;
}
}
else
{
if (yych <= 'E')
{
goto basic_json_parser_44;
goto basic_json_parser_48;
}
if (yych == 'e')
{
goto basic_json_parser_44;
goto basic_json_parser_48;
}
}
basic_json_parser_14:
{
last_token_type = token_type::value_number;
last_token_type = token_type::value_unsigned;
break;
}
basic_json_parser_15:
@ -9918,7 +9922,7 @@ basic_json_parser_15:
{
if (yych == '.')
{
goto basic_json_parser_43;
goto basic_json_parser_47;
}
goto basic_json_parser_14;
}
@ -9926,11 +9930,11 @@ basic_json_parser_15:
{
if (yych <= 'E')
{
goto basic_json_parser_44;
goto basic_json_parser_48;
}
if (yych == 'e')
{
goto basic_json_parser_44;
goto basic_json_parser_48;
}
goto basic_json_parser_14;
}
@ -9957,7 +9961,7 @@ basic_json_parser_23:
yych = *(m_marker = ++m_cursor);
if (yych == 'a')
{
goto basic_json_parser_45;
goto basic_json_parser_49;
}
goto basic_json_parser_5;
basic_json_parser_24:
@ -9965,7 +9969,7 @@ basic_json_parser_24:
yych = *(m_marker = ++m_cursor);
if (yych == 'u')
{
goto basic_json_parser_46;
goto basic_json_parser_50;
}
goto basic_json_parser_5;
basic_json_parser_25:
@ -9973,7 +9977,7 @@ basic_json_parser_25:
yych = *(m_marker = ++m_cursor);
if (yych == 'r')
{
goto basic_json_parser_47;
goto basic_json_parser_51;
}
goto basic_json_parser_5;
basic_json_parser_26:
@ -10055,13 +10059,27 @@ basic_json_parser_31:
}
basic_json_parser_32:
m_cursor = m_marker;
if (yyaccept == 0)
if (yyaccept <= 1)
{
goto basic_json_parser_5;
if (yyaccept == 0)
{
goto basic_json_parser_5;
}
else
{
goto basic_json_parser_14;
}
}
else
{
goto basic_json_parser_14;
if (yyaccept == 2)
{
goto basic_json_parser_44;
}
else
{
goto basic_json_parser_55;
}
}
basic_json_parser_33:
++m_cursor;
@ -10142,7 +10160,7 @@ basic_json_parser_35:
}
if (yych <= 'u')
{
goto basic_json_parser_48;
goto basic_json_parser_52;
}
goto basic_json_parser_32;
}
@ -10261,6 +10279,71 @@ basic_json_parser_42:
}
goto basic_json_parser_32;
basic_json_parser_43:
yyaccept = 2;
yych = *(m_marker = ++m_cursor);
if (yych <= 'D')
{
if (yych == '.')
{
goto basic_json_parser_47;
}
}
else
{
if (yych <= 'E')
{
goto basic_json_parser_48;
}
if (yych == 'e')
{
goto basic_json_parser_48;
}
}
basic_json_parser_44:
{
last_token_type = token_type::value_integer;
break;
}
basic_json_parser_45:
yyaccept = 2;
m_marker = ++m_cursor;
if ((m_limit - m_cursor) < 3)
{
fill_line_buffer(3); // LCOV_EXCL_LINE
}
yych = *m_cursor;
if (yych <= '9')
{
if (yych == '.')
{
goto basic_json_parser_47;
}
if (yych <= '/')
{
goto basic_json_parser_44;
}
goto basic_json_parser_45;
}
else
{
if (yych <= 'E')
{
if (yych <= 'D')
{
goto basic_json_parser_44;
}
goto basic_json_parser_48;
}
else
{
if (yych == 'e')
{
goto basic_json_parser_48;
}
goto basic_json_parser_44;
}
}
basic_json_parser_47:
yych = *++m_cursor;
if (yych <= '/')
{
@ -10268,16 +10351,16 @@ basic_json_parser_43:
}
if (yych <= '9')
{
goto basic_json_parser_49;
goto basic_json_parser_53;
}
goto basic_json_parser_32;
basic_json_parser_44:
basic_json_parser_48:
yych = *++m_cursor;
if (yych <= ',')
{
if (yych == '+')
{
goto basic_json_parser_51;
goto basic_json_parser_56;
}
goto basic_json_parser_32;
}
@ -10285,7 +10368,7 @@ basic_json_parser_44:
{
if (yych <= '-')
{
goto basic_json_parser_51;
goto basic_json_parser_56;
}
if (yych <= '/')
{
@ -10293,32 +10376,32 @@ basic_json_parser_44:
}
if (yych <= '9')
{
goto basic_json_parser_52;
goto basic_json_parser_57;
}
goto basic_json_parser_32;
}
basic_json_parser_45:
basic_json_parser_49:
yych = *++m_cursor;
if (yych == 'l')
{
goto basic_json_parser_54;
goto basic_json_parser_59;
}
goto basic_json_parser_32;
basic_json_parser_46:
basic_json_parser_50:
yych = *++m_cursor;
if (yych == 'l')
{
goto basic_json_parser_55;
goto basic_json_parser_60;
}
goto basic_json_parser_32;
basic_json_parser_47:
basic_json_parser_51:
yych = *++m_cursor;
if (yych == 'u')
{
goto basic_json_parser_56;
goto basic_json_parser_61;
}
goto basic_json_parser_32;
basic_json_parser_48:
basic_json_parser_52:
++m_cursor;
if (m_limit <= m_cursor)
{
@ -10333,7 +10416,7 @@ basic_json_parser_48:
}
if (yych <= '9')
{
goto basic_json_parser_57;
goto basic_json_parser_62;
}
goto basic_json_parser_32;
}
@ -10341,7 +10424,7 @@ basic_json_parser_48:
{
if (yych <= 'F')
{
goto basic_json_parser_57;
goto basic_json_parser_62;
}
if (yych <= '`')
{
@ -10349,12 +10432,12 @@ basic_json_parser_48:
}
if (yych <= 'f')
{
goto basic_json_parser_57;
goto basic_json_parser_62;
}
goto basic_json_parser_32;
}
basic_json_parser_49:
yyaccept = 1;
basic_json_parser_53:
yyaccept = 3;
m_marker = ++m_cursor;
if ((m_limit - m_cursor) < 3)
{
@ -10365,27 +10448,30 @@ basic_json_parser_49:
{
if (yych <= '/')
{
goto basic_json_parser_14;
goto basic_json_parser_55;
}
if (yych <= '9')
{
goto basic_json_parser_49;
goto basic_json_parser_53;
}
goto basic_json_parser_14;
}
else
{
if (yych <= 'E')
{
goto basic_json_parser_44;
goto basic_json_parser_48;
}
if (yych == 'e')
{
goto basic_json_parser_44;
goto basic_json_parser_48;
}
goto basic_json_parser_14;
}
basic_json_parser_51:
basic_json_parser_55:
{
last_token_type = token_type::value_float;
break;
}
basic_json_parser_56:
yych = *++m_cursor;
if (yych <= '/')
{
@ -10395,7 +10481,7 @@ basic_json_parser_51:
{
goto basic_json_parser_32;
}
basic_json_parser_52:
basic_json_parser_57:
++m_cursor;
if (m_limit <= m_cursor)
{
@ -10404,35 +10490,35 @@ basic_json_parser_52:
yych = *m_cursor;
if (yych <= '/')
{
goto basic_json_parser_14;
goto basic_json_parser_55;
}
if (yych <= '9')
{
goto basic_json_parser_52;
goto basic_json_parser_57;
}
goto basic_json_parser_14;
basic_json_parser_54:
goto basic_json_parser_55;
basic_json_parser_59:
yych = *++m_cursor;
if (yych == 's')
{
goto basic_json_parser_58;
goto basic_json_parser_63;
}
goto basic_json_parser_32;
basic_json_parser_55:
basic_json_parser_60:
yych = *++m_cursor;
if (yych == 'l')
{
goto basic_json_parser_59;
goto basic_json_parser_64;
}
goto basic_json_parser_32;
basic_json_parser_56:
basic_json_parser_61:
yych = *++m_cursor;
if (yych == 'e')
{
goto basic_json_parser_61;
goto basic_json_parser_66;
}
goto basic_json_parser_32;
basic_json_parser_57:
basic_json_parser_62:
++m_cursor;
if (m_limit <= m_cursor)
{
@ -10447,7 +10533,7 @@ basic_json_parser_57:
}
if (yych <= '9')
{
goto basic_json_parser_63;
goto basic_json_parser_68;
}
goto basic_json_parser_32;
}
@ -10455,7 +10541,7 @@ basic_json_parser_57:
{
if (yych <= 'F')
{
goto basic_json_parser_63;
goto basic_json_parser_68;
}
if (yych <= '`')
{
@ -10463,30 +10549,30 @@ basic_json_parser_57:
}
if (yych <= 'f')
{
goto basic_json_parser_63;
goto basic_json_parser_68;
}
goto basic_json_parser_32;
}
basic_json_parser_58:
basic_json_parser_63:
yych = *++m_cursor;
if (yych == 'e')
{
goto basic_json_parser_64;
goto basic_json_parser_69;
}
goto basic_json_parser_32;
basic_json_parser_59:
basic_json_parser_64:
++m_cursor;
{
last_token_type = token_type::literal_null;
break;
}
basic_json_parser_61:
basic_json_parser_66:
++m_cursor;
{
last_token_type = token_type::literal_true;
break;
}
basic_json_parser_63:
basic_json_parser_68:
++m_cursor;
if (m_limit <= m_cursor)
{
@ -10501,7 +10587,7 @@ basic_json_parser_63:
}
if (yych <= '9')
{
goto basic_json_parser_66;
goto basic_json_parser_71;
}
goto basic_json_parser_32;
}
@ -10509,7 +10595,7 @@ basic_json_parser_63:
{
if (yych <= 'F')
{
goto basic_json_parser_66;
goto basic_json_parser_71;
}
if (yych <= '`')
{
@ -10517,17 +10603,17 @@ basic_json_parser_63:
}
if (yych <= 'f')
{
goto basic_json_parser_66;
goto basic_json_parser_71;
}
goto basic_json_parser_32;
}
basic_json_parser_64:
basic_json_parser_69:
++m_cursor;
{
last_token_type = token_type::literal_false;
break;
}
basic_json_parser_66:
basic_json_parser_71:
++m_cursor;
if (m_limit <= m_cursor)
{
@ -10838,59 +10924,155 @@ basic_json_parser_66:
return result;
}
/*!
@brief parse floating point number
This function (and its overloads) serves to select the most appropriate
standard floating point number parsing function based on the type
supplied via the first parameter. Set this to @a
static_cast<number_float_t*>(nullptr).
@param[in,out] endptr receives a pointer to the first character after
the number
@return the floating point number
*/
long double str_to_float_t(long double* /* type */, char** endptr) const
{
return std::strtold(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
}
/*!
@brief parse floating point number
@brief parse string into a built-in arithmetic type as if the current
locale is POSIX.
This function (and its overloads) serves to select the most appropriate
standard floating point number parsing function based on the type
supplied via the first parameter. Set this to @a
static_cast<number_float_t*>(nullptr).
@note in floating-point case strtod may parse past the token's end -
this is not an error
@param[in,out] endptr receives a pointer to the first character after
the number
@return the floating point number
@note any leading blanks are not handled
*/
double str_to_float_t(double* /* type */, char** endptr) const
struct strtonum
{
return std::strtod(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
}
public:
strtonum(const char* start, const char* end)
: m_start(start), m_end(end)
{}
/*!
@brief parse floating point number
/*!
@return true iff parsed successfully as number of type T
This function (and its overloads) serves to select the most appropriate
standard floating point number parsing function based on the type
supplied via the first parameter. Set this to @a
static_cast<number_float_t*>(nullptr).
@param[in,out] val shall contain parsed value, or undefined value
if could not parse
*/
template<typename T, typename = typename std::enable_if<std::is_arithmetic<T>::value>::type>
bool to(T& val) const
{
return parse(val, std::is_integral<T>());
}
@param[in,out] endptr receives a pointer to the first character after
the number
private:
const char* const m_start = nullptr;
const char* const m_end = nullptr;
@return the floating point number
*/
float str_to_float_t(float* /* type */, char** endptr) const
{
return std::strtof(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
}
// floating-point conversion
// overloaded wrappers for strtod/strtof/strtold
// that will be called from parse<floating_point_t>
static void strtof(float& f, const char* str, char** endptr)
{
f = std::strtof(str, endptr);
}
static void strtof(double& f, const char* str, char** endptr)
{
f = std::strtod(str, endptr);
}
static void strtof(long double& f, const char* str, char** endptr)
{
f = std::strtold(str, endptr);
}
template<typename T>
bool parse(T& value, /*is_integral=*/std::false_type) const
{
// replace decimal separator with locale-specific version,
// when necessary; data will point to either the original
// string, or buf, or tempstr containing the fixed string.
std::string tempstr;
std::array<char, 64> buf;
const size_t len = static_cast<size_t>(m_end - m_start);
// lexer will reject empty numbers
assert(len > 0);
// since dealing with strtod family of functions, we're
// getting the decimal point char from the C locale facilities
// instead of C++'s numpunct facet of the current std::locale
const auto loc = localeconv();
assert(loc != nullptr);
const char decimal_point_char = (loc->decimal_point == nullptr) ? '.' : loc->decimal_point[0];
const char* data = m_start;
if (decimal_point_char != '.')
{
const size_t ds_pos = static_cast<size_t>(std::find(m_start, m_end, '.') - m_start);
if (ds_pos != len)
{
// copy the data into the local buffer or tempstr, if
// buffer is too small; replace decimal separator, and
// update data to point to the modified bytes
if ((len + 1) < buf.size())
{
std::copy(m_start, m_end, buf.data());
buf[len] = 0;
buf[ds_pos] = decimal_point_char;
data = buf.data();
}
else
{
tempstr.assign(m_start, m_end);
tempstr[ds_pos] = decimal_point_char;
data = tempstr.c_str();
}
}
}
char* endptr = nullptr;
value = 0;
// this calls appropriate overload depending on T
strtof(value, data, &endptr);
// parsing was successful iff strtof parsed exactly the number
// of characters determined by the lexer (len)
const bool ok = (endptr == (data + len));
if (ok and (value == 0.0) and (*data == '-'))
{
// some implementations forget to negate the zero
value = -0.0;
}
return ok;
}
// integral conversion
signed long long parse_integral(char** endptr, /*is_signed*/std::true_type) const
{
return std::strtoll(m_start, endptr, 10);
}
unsigned long long parse_integral(char** endptr, /*is_signed*/std::false_type) const
{
return std::strtoull(m_start, endptr, 10);
}
template<typename T>
bool parse(T& value, /*is_integral=*/std::true_type) const
{
char* endptr = nullptr;
errno = 0; // these are thread-local
const auto x = parse_integral(&endptr, std::is_signed<T>());
// called right overload?
static_assert(std::is_signed<T>() == std::is_signed<decltype(x)>(), "");
value = static_cast<T>(x);
return (x == static_cast<decltype(x)>(value)) // x fits into destination T
and (x < 0) == (value < 0) // preserved sign
//and ((x != 0) or is_integral()) // strto[u]ll did nto fail
and (errno == 0) // strto[u]ll did not overflow
and (m_start < m_end) // token was not empty
and (endptr == m_end); // parsed entire token exactly
}
};
/*!
@brief return number value for number tokens
@ -10899,125 +11081,84 @@ basic_json_parser_66:
number type (either integer, unsigned integer or floating point),
which is passed back to the caller via the result parameter.
This function parses the integer component up to the radix point or
exponent while collecting information about the 'floating point
representation', which it stores in the result parameter. If there is
no radix point or exponent, and the number can fit into a @ref
number_integer_t or @ref number_unsigned_t then it sets the result
parameter accordingly.
integral numbers that don't fit into the the range of the respective
type are parsed as number_float_t
If the number is a floating point number the number is then parsed
using @a std:strtod (or @a std:strtof or @a std::strtold).
floating-point values do not satisfy std::isfinite predicate
are converted to value_t::null
@param[out] result @ref basic_json object to receive the number, or
NAN if the conversion read past the current token. The latter case
needs to be treated by the caller function.
throws if the entire string [m_start .. m_cursor) cannot be
interpreted as a number
@param[out] result @ref basic_json object to receive the number.
@param[in] token the type of the number token
*/
void get_number(basic_json& result) const
bool get_number(basic_json& result, const token_type token) const
{
assert(m_start != nullptr);
assert(m_start < m_cursor);
assert((token == token_type::value_unsigned) or
(token == token_type::value_integer) or
(token == token_type::value_float));
const lexer::lexer_char_t* curptr = m_start;
strtonum num_converter(reinterpret_cast<const char*>(m_start),
reinterpret_cast<const char*>(m_cursor));
// accumulate the integer conversion result (unsigned for now)
number_unsigned_t value = 0;
// maximum absolute value of the relevant integer type
number_unsigned_t max;
// temporarily store the type to avoid unnecessary bitfield access
value_t type;
// look for sign
if (*curptr == '-')
switch (token)
{
type = value_t::number_integer;
max = static_cast<uint64_t>((std::numeric_limits<number_integer_t>::max)()) + 1;
curptr++;
}
else
{
type = value_t::number_unsigned;
max = static_cast<uint64_t>((std::numeric_limits<number_unsigned_t>::max)());
}
// count the significant figures
for (; curptr < m_cursor; curptr++)
{
// quickly skip tests if a digit
if (*curptr < '0' or* curptr > '9')
case lexer::token_type::value_unsigned:
{
if (*curptr == '.')
number_unsigned_t val;
if (num_converter.to(val))
{
// don't count '.' but change to float
type = value_t::number_float;
continue;
// parsing successful
result.m_type = value_t::number_unsigned;
result.m_value = val;
return true;
}
// assume exponent (if not then will fail parse): change to
// float, stop counting and record exponent details
type = value_t::number_float;
break;
}
// skip if definitely not an integer
if (type != value_t::number_float)
case lexer::token_type::value_integer:
{
auto digit = static_cast<number_unsigned_t>(*curptr - '0');
// overflow if value * 10 + digit > max, move terms around
// to avoid overflow in intermediate values
if (value > (max - digit) / 10)
number_integer_t val;
if (num_converter.to(val))
{
// overflow
type = value_t::number_float;
}
else
{
// no overflow
value = value * 10 + digit;
// parsing successful
result.m_type = value_t::number_integer;
result.m_value = val;
return true;
}
break;
}
default:
{
break;
}
}
// save the value (if not a float)
if (type == value_t::number_unsigned)
// parse float (either explicitly or because a previous conversion
// failed)
number_float_t val;
if (num_converter.to(val))
{
result.m_value.number_unsigned = value;
}
else if (type == value_t::number_integer)
{
// invariant: if we parsed a '-', the absolute value is between
// 0 (we allow -0) and max == -INT64_MIN
assert(value >= 0);
assert(value <= max);
if (value == max)
{
// we cannot simply negate value (== max == -INT64_MIN),
// see https://github.com/nlohmann/json/issues/389
result.m_value.number_integer = static_cast<number_integer_t>(INT64_MIN);
}
else
{
// all other values can be negated safely
result.m_value.number_integer = -static_cast<number_integer_t>(value);
}
}
else
{
// parse with strtod
result.m_value.number_float = str_to_float_t(static_cast<number_float_t*>(nullptr), nullptr);
// parsing successful
result.m_type = value_t::number_float;
result.m_value = val;
// replace infinity and NAN by null
if (not std::isfinite(result.m_value.number_float))
{
type = value_t::null;
result.m_type = value_t::null;
result.m_value = basic_json::json_value();
}
return true;
}
// save the type
result.m_type = type;
// couldn't parse number in any format
return false;
}
private:
@ -11261,10 +11402,20 @@ basic_json_parser_66:
break;
}
case lexer::token_type::value_number:
case lexer::token_type::value_unsigned:
case lexer::token_type::value_integer:
case lexer::token_type::value_float:
{
m_lexer.get_number(result);
const bool ok = m_lexer.get_number(result, last_token);
get_token();
// if number conversion was unsuccessful, then is is
// because the number was directly followed by an
// unexpected character (e.g. "01" where "1" is unexpected)
if (not ok)
{
unexpect(last_token);
}
break;
}

371
src/json.hpp.re2c
View file

@ -9444,7 +9444,9 @@ class basic_json
literal_false, ///< the `false` literal
literal_null, ///< the `null` literal
value_string, ///< a string -- use get_string() for actual value
value_number, ///< a number -- use get_number() for actual value
value_unsigned, ///< an unsigned integer -- use get_number() for actual value
value_integer, ///< a signed integer -- use get_number() for actual value
value_float, ///< an floating point number -- use get_number() for actual value
begin_array, ///< the character for array begin `[`
begin_object, ///< the character for object begin `{`
end_array, ///< the character for array end `]`
@ -9596,7 +9598,9 @@ class basic_json
return "null literal";
case token_type::value_string:
return "string literal";
case token_type::value_number:
case lexer::token_type::value_unsigned:
case lexer::token_type::value_integer:
case lexer::token_type::value_float:
return "number literal";
case token_type::begin_array:
return "'['";
@ -9684,18 +9688,22 @@ class basic_json
"false" { last_token_type = token_type::literal_false; break; }
// number
decimal_point = ".";
digit = [0-9];
digit_1_9 = [1-9];
e = "e" | "E";
minus = "-";
plus = "+";
zero = "0";
exp = e (minus | plus)? digit+;
frac = decimal_point digit+;
int = (zero | digit_1_9 digit*);
number = minus? int frac? exp?;
number { last_token_type = token_type::value_number; break; }
decimal_point = ".";
digit = [0-9];
digit_1_9 = [1-9];
e = "e" | "E";
minus = "-";
plus = "+";
zero = "0";
exp = e (minus | plus)? digit+;
frac = decimal_point digit+;
int = (zero | digit_1_9 digit*);
number_unsigned = int;
number_unsigned { last_token_type = token_type::value_unsigned; break; }
number_integer = minus int;
number_integer { last_token_type = token_type::value_integer; break; }
number_float = minus? int frac? exp?;
number_float { last_token_type = token_type::value_float; break; }
// string
quotation_mark = "\"";
@ -9988,59 +9996,155 @@ class basic_json
return result;
}
/*!
@brief parse floating point number
This function (and its overloads) serves to select the most appropriate
standard floating point number parsing function based on the type
supplied via the first parameter. Set this to @a
static_cast<number_float_t*>(nullptr).
@param[in,out] endptr receives a pointer to the first character after
the number
@return the floating point number
*/
long double str_to_float_t(long double* /* type */, char** endptr) const
{
return std::strtold(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
}
/*!
@brief parse floating point number
@brief parse string into a built-in arithmetic type as if the current
locale is POSIX.
This function (and its overloads) serves to select the most appropriate
standard floating point number parsing function based on the type
supplied via the first parameter. Set this to @a
static_cast<number_float_t*>(nullptr).
@note in floating-point case strtod may parse past the token's end -
this is not an error
@param[in,out] endptr receives a pointer to the first character after
the number
@return the floating point number
@note any leading blanks are not handled
*/
double str_to_float_t(double* /* type */, char** endptr) const
struct strtonum
{
return std::strtod(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
}
public:
strtonum(const char* start, const char* end)
: m_start(start), m_end(end)
{}
/*!
@brief parse floating point number
/*!
@return true iff parsed successfully as number of type T
This function (and its overloads) serves to select the most appropriate
standard floating point number parsing function based on the type
supplied via the first parameter. Set this to @a
static_cast<number_float_t*>(nullptr).
@param[in,out] val shall contain parsed value, or undefined value
if could not parse
*/
template<typename T, typename = typename std::enable_if<std::is_arithmetic<T>::value>::type>
bool to(T& val) const
{
return parse(val, std::is_integral<T>());
}
@param[in,out] endptr receives a pointer to the first character after
the number
private:
const char* const m_start = nullptr;
const char* const m_end = nullptr;
@return the floating point number
*/
float str_to_float_t(float* /* type */, char** endptr) const
{
return std::strtof(reinterpret_cast<typename string_t::const_pointer>(m_start), endptr);
}
// floating-point conversion
// overloaded wrappers for strtod/strtof/strtold
// that will be called from parse<floating_point_t>
static void strtof(float& f, const char* str, char** endptr)
{
f = std::strtof(str, endptr);
}
static void strtof(double& f, const char* str, char** endptr)
{
f = std::strtod(str, endptr);
}
static void strtof(long double& f, const char* str, char** endptr)
{
f = std::strtold(str, endptr);
}
template<typename T>
bool parse(T& value, /*is_integral=*/std::false_type) const
{
// replace decimal separator with locale-specific version,
// when necessary; data will point to either the original
// string, or buf, or tempstr containing the fixed string.
std::string tempstr;
std::array<char, 64> buf;
const size_t len = static_cast<size_t>(m_end - m_start);
// lexer will reject empty numbers
assert(len > 0);
// since dealing with strtod family of functions, we're
// getting the decimal point char from the C locale facilities
// instead of C++'s numpunct facet of the current std::locale
const auto loc = localeconv();
assert(loc != nullptr);
const char decimal_point_char = (loc->decimal_point == nullptr) ? '.' : loc->decimal_point[0];
const char* data = m_start;
if (decimal_point_char != '.')
{
const size_t ds_pos = static_cast<size_t>(std::find(m_start, m_end, '.') - m_start);
if (ds_pos != len)
{
// copy the data into the local buffer or tempstr, if
// buffer is too small; replace decimal separator, and
// update data to point to the modified bytes
if ((len + 1) < buf.size())
{
std::copy(m_start, m_end, buf.data());
buf[len] = 0;
buf[ds_pos] = decimal_point_char;
data = buf.data();
}
else
{
tempstr.assign(m_start, m_end);
tempstr[ds_pos] = decimal_point_char;
data = tempstr.c_str();
}
}
}
char* endptr = nullptr;
value = 0;
// this calls appropriate overload depending on T
strtof(value, data, &endptr);
// parsing was successful iff strtof parsed exactly the number
// of characters determined by the lexer (len)
const bool ok = (endptr == (data + len));
if (ok and (value == 0.0) and (*data == '-'))
{
// some implementations forget to negate the zero
value = -0.0;
}
return ok;
}
// integral conversion
signed long long parse_integral(char** endptr, /*is_signed*/std::true_type) const
{
return std::strtoll(m_start, endptr, 10);
}
unsigned long long parse_integral(char** endptr, /*is_signed*/std::false_type) const
{
return std::strtoull(m_start, endptr, 10);
}
template<typename T>
bool parse(T& value, /*is_integral=*/std::true_type) const
{
char* endptr = nullptr;
errno = 0; // these are thread-local
const auto x = parse_integral(&endptr, std::is_signed<T>());
// called right overload?
static_assert(std::is_signed<T>() == std::is_signed<decltype(x)>(), "");
value = static_cast<T>(x);
return (x == static_cast<decltype(x)>(value)) // x fits into destination T
and (x < 0) == (value < 0) // preserved sign
//and ((x != 0) or is_integral()) // strto[u]ll did nto fail
and (errno == 0) // strto[u]ll did not overflow
and (m_start < m_end) // token was not empty
and (endptr == m_end); // parsed entire token exactly
}
};
/*!
@brief return number value for number tokens
@ -10049,125 +10153,84 @@ class basic_json
number type (either integer, unsigned integer or floating point),
which is passed back to the caller via the result parameter.
This function parses the integer component up to the radix point or
exponent while collecting information about the 'floating point
representation', which it stores in the result parameter. If there is
no radix point or exponent, and the number can fit into a @ref
number_integer_t or @ref number_unsigned_t then it sets the result
parameter accordingly.
integral numbers that don't fit into the the range of the respective
type are parsed as number_float_t
If the number is a floating point number the number is then parsed
using @a std:strtod (or @a std:strtof or @a std::strtold).
floating-point values do not satisfy std::isfinite predicate
are converted to value_t::null
@param[out] result @ref basic_json object to receive the number, or
NAN if the conversion read past the current token. The latter case
needs to be treated by the caller function.
throws if the entire string [m_start .. m_cursor) cannot be
interpreted as a number
@param[out] result @ref basic_json object to receive the number.
@param[in] token the type of the number token
*/
void get_number(basic_json& result) const
bool get_number(basic_json& result, const token_type token) const
{
assert(m_start != nullptr);
assert(m_start < m_cursor);
assert((token == token_type::value_unsigned) or
(token == token_type::value_integer) or
(token == token_type::value_float));
const lexer::lexer_char_t* curptr = m_start;
strtonum num_converter(reinterpret_cast<const char*>(m_start),
reinterpret_cast<const char*>(m_cursor));
// accumulate the integer conversion result (unsigned for now)
number_unsigned_t value = 0;
// maximum absolute value of the relevant integer type
number_unsigned_t max;
// temporarily store the type to avoid unnecessary bitfield access
value_t type;
// look for sign
if (*curptr == '-')
switch (token)
{
type = value_t::number_integer;
max = static_cast<uint64_t>((std::numeric_limits<number_integer_t>::max)()) + 1;
curptr++;
}
else
{
type = value_t::number_unsigned;
max = static_cast<uint64_t>((std::numeric_limits<number_unsigned_t>::max)());
}
// count the significant figures
for (; curptr < m_cursor; curptr++)
{
// quickly skip tests if a digit
if (*curptr < '0' or* curptr > '9')
case lexer::token_type::value_unsigned:
{
if (*curptr == '.')
number_unsigned_t val;
if (num_converter.to(val))
{
// don't count '.' but change to float
type = value_t::number_float;
continue;
// parsing successful
result.m_type = value_t::number_unsigned;
result.m_value = val;
return true;
}
// assume exponent (if not then will fail parse): change to
// float, stop counting and record exponent details
type = value_t::number_float;
break;
}
// skip if definitely not an integer
if (type != value_t::number_float)
case lexer::token_type::value_integer:
{
auto digit = static_cast<number_unsigned_t>(*curptr - '0');
// overflow if value * 10 + digit > max, move terms around
// to avoid overflow in intermediate values
if (value > (max - digit) / 10)
number_integer_t val;
if (num_converter.to(val))
{
// overflow
type = value_t::number_float;
}
else
{
// no overflow
value = value * 10 + digit;
// parsing successful
result.m_type = value_t::number_integer;
result.m_value = val;
return true;
}
break;
}
default:
{
break;
}
}
// save the value (if not a float)
if (type == value_t::number_unsigned)
// parse float (either explicitly or because a previous conversion
// failed)
number_float_t val;
if (num_converter.to(val))
{
result.m_value.number_unsigned = value;
}
else if (type == value_t::number_integer)
{
// invariant: if we parsed a '-', the absolute value is between
// 0 (we allow -0) and max == -INT64_MIN
assert(value >= 0);
assert(value <= max);
if (value == max)
{
// we cannot simply negate value (== max == -INT64_MIN),
// see https://github.com/nlohmann/json/issues/389
result.m_value.number_integer = static_cast<number_integer_t>(INT64_MIN);
}
else
{
// all other values can be negated safely
result.m_value.number_integer = -static_cast<number_integer_t>(value);
}
}
else
{
// parse with strtod
result.m_value.number_float = str_to_float_t(static_cast<number_float_t*>(nullptr), nullptr);
// parsing successful
result.m_type = value_t::number_float;
result.m_value = val;
// replace infinity and NAN by null
if (not std::isfinite(result.m_value.number_float))
{
type = value_t::null;
result.m_type = value_t::null;
result.m_value = basic_json::json_value();
}
return true;
}
// save the type
result.m_type = type;
// couldn't parse number in any format
return false;
}
private:
@ -10411,10 +10474,20 @@ class basic_json
break;
}
case lexer::token_type::value_number:
case lexer::token_type::value_unsigned:
case lexer::token_type::value_integer:
case lexer::token_type::value_float:
{
m_lexer.get_number(result);
const bool ok = m_lexer.get_number(result, last_token);
get_token();
// if number conversion was unsuccessful, then is is
// because the number was directly followed by an
// unexpected character (e.g. "01" where "1" is unexpected)
if (not ok)
{
unexpect(last_token);
}
break;
}

36
test/src/unit-class_lexer.cpp
View file

@ -65,25 +65,37 @@ TEST_CASE("lexer class")
SECTION("numbers")
{
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("0"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("1"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("2"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("3"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("4"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("5"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("6"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("7"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("8"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("9"),
1).scan() == json::lexer::token_type::value_number));
1).scan() == json::lexer::token_type::value_unsigned));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("-0"),
2).scan() == json::lexer::token_type::value_integer));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("-1"),
2).scan() == json::lexer::token_type::value_integer));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("1.1"),
3).scan() == json::lexer::token_type::value_float));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("-1.1"),
4).scan() == json::lexer::token_type::value_float));
CHECK((json::lexer(reinterpret_cast<const json::lexer::lexer_char_t*>("1E10"),
4).scan() == json::lexer::token_type::value_float));
}
SECTION("whitespace")
@ -109,7 +121,9 @@ TEST_CASE("lexer class")
CHECK((json::lexer::token_type_name(json::lexer::token_type::literal_false) == "false literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::literal_null) == "null literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::value_string) == "string literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::value_number) == "number literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::value_unsigned) == "number literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::value_integer) == "number literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::value_float) == "number literal"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::begin_array) == "'['"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::begin_object) == "'{'"));
CHECK((json::lexer::token_type_name(json::lexer::token_type::end_array) == "']'"));

8
test/src/unit-class_parser.cpp
View file

@ -101,6 +101,7 @@ TEST_CASE("parser class")
CHECK_THROWS_WITH(json::parser("\"\b\"").parse(), "parse error - unexpected '\"'");
// improve code coverage
CHECK_THROWS_AS(json::parser("\uFF01").parse(), std::invalid_argument);
CHECK_THROWS_AS(json::parser("[-4:1,]").parse(), std::invalid_argument);
// unescaped control characters
CHECK_THROWS_AS(json::parser("\"\x00\"").parse(), std::invalid_argument);
CHECK_THROWS_AS(json::parser("\"\x01\"").parse(), std::invalid_argument);
@ -269,6 +270,11 @@ TEST_CASE("parser class")
}
}
SECTION("overflow")
{
CHECK(json::parser("1.18973e+4932").parse() == json());
}
SECTION("invalid numbers")
{
CHECK_THROWS_AS(json::parser("01").parse(), std::invalid_argument);
@ -293,7 +299,7 @@ TEST_CASE("parser class")
CHECK_THROWS_AS(json::parser("+0").parse(), std::invalid_argument);
CHECK_THROWS_WITH(json::parser("01").parse(),
"parse error - unexpected number literal; expected end of input");
"parse error - unexpected number literal");
CHECK_THROWS_WITH(json::parser("--1").parse(), "parse error - unexpected '-'");
CHECK_THROWS_WITH(json::parser("1.").parse(),
"parse error - unexpected '.'; expected end of input");

28
test/src/unit-regression.cpp
View file

@ -383,7 +383,7 @@ TEST_CASE("regression tests")
};
// change locale to mess with decimal points
std::locale::global(std::locale(std::locale(), new CommaDecimalSeparator));
auto orig_locale = std::locale::global(std::locale(std::locale(), new CommaDecimalSeparator));
CHECK(j1a.dump() == "23.42");
CHECK(j1b.dump() == "23.42");
@ -407,8 +407,34 @@ TEST_CASE("regression tests")
CHECK(j3c.dump() == "10000");
//CHECK(j3b.dump() == "1E04"); // roundtrip error
//CHECK(j3c.dump() == "1e04"); // roundtrip error
std::locale::global(orig_locale);
}
SECTION("issue #379 - locale-independent str-to-num")
{
setlocale(LC_NUMERIC, "de_DE.UTF-8");
// disabled, because locale-specific beharivor is not
// triggered in AppVeyor for some reason
#ifndef _MSC_VER
{
// verify that strtod now uses commas as decimal-separator
CHECK(std::strtod("3,14", nullptr) == 3.14);
// verify that strtod does not understand dots as decimal separator
CHECK(std::strtod("3.14", nullptr) == 3);
}
#endif
// verify that parsed correctly despite using strtod internally
CHECK(json::parse("3.14").get<double>() == 3.14);
// check a different code path
CHECK(json::parse("1.000000000000000000000000000000000000000000000000000000000000000000000000").get<double>() == 1.0);
}
SECTION("issue #233 - Can't use basic_json::iterator as a base iterator for std::move_iterator")
{
json source = {"a", "b", "c"};