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🔨 make lexer distinguishes number types

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This commit is contained in:
Niels Lohmann
2017-02-11 16:54:25 +01:00
parent 9f5dccbab5
commit c2d55109c1
3 changed files with 275 additions and 215 deletions
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136
src/json.hpp.re2c
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@ -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_integer, ///< an unsigned integer -- use get_number() for actual value
value_signed_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_integer:
case lexer::token_type::value_signed_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_integer; break; }
number_signed = minus int;
number_signed { last_token_type = token_type::value_signed_integer; break; }
number_float = minus? int frac? exp?;
number_float { last_token_type = token_type::value_float; break; }
// string
quotation_mark = "\"";
@ -10017,42 +10025,6 @@ class basic_json
return parse(val, std::is_integral<T>());
}
/*!
This is a helper to determine whether to parse the token into
floating-point or integral type.
@note We wouldn't need it if we had separate token types for
integral and floating-point cases.
@return true iff token matches `^[+-]\d+$`
*/
bool is_integral() const
{
const char* p = m_start;
if (p == nullptr)
{
return false; // LCOV_EXCL_LINE
}
if ((*p == '-') or (*p == '+'))
{
++p;
}
if (p == m_end)
{
return false; // LCOV_EXCL_LINE
}
while ((p < m_end) and (*p >= '0') and (*p <= '9'))
{
++p;
}
return (p == m_end);
}
private:
const char* const m_start = nullptr;
const char* const m_end = nullptr;
@ -10161,7 +10133,7 @@ class basic_json
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 ((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
@ -10185,46 +10157,56 @@ class basic_json
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
void 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_integer) or
(token == token_type::value_signed_integer) or
(token == token_type::value_float));
strtonum num(reinterpret_cast<const char*>(m_start),
reinterpret_cast<const char*>(m_cursor));
const bool is_negative = (*m_start == '-');
result.m_type = value_t::discarded;
if (not num.is_integral())
switch (token)
{
// will parse as float below
}
else if (is_negative)
{
number_integer_t val{0};
if (num.to(val))
case lexer::token_type::value_unsigned_integer:
{
result.m_type = value_t::number_integer;
result.m_value = val;
number_unsigned_t val{0};
if (num.to(val))
{
result.m_type = value_t::number_unsigned;
result.m_value = val;
return;
}
break;
}
}
else
{
number_unsigned_t val{0};
if (num.to(val))
case lexer::token_type::value_signed_integer:
{
result.m_type = value_t::number_unsigned;
result.m_value = val;
number_integer_t val{0};
if (num.to(val))
{
result.m_type = value_t::number_integer;
result.m_value = val;
return;
}
break;
}
default:
{
break;
}
}
number_float_t val{0};
if (result.m_type != value_t::discarded or (not num.to(val)))
if (not num.to(val))
{
// already have a value from above or couldn't parse as float_t
// couldn't parse as float_t
result.m_type = value_t::discarded;
return;
}
@ -10480,9 +10462,11 @@ class basic_json
break;
}
case lexer::token_type::value_number:
case lexer::token_type::value_unsigned_integer:
case lexer::token_type::value_signed_integer:
case lexer::token_type::value_float:
{
m_lexer.get_number(result);
m_lexer.get_number(result, last_token);
get_token();
break;
}