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#include <Common/FieldVisitorToString.h>
#include <IO/WriteHelpers.h>
#include <IO/WriteBufferFromString.h>
#include <IO/Operators.h>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER;
}
template <typename T>
static inline String formatQuoted(T x)
{
WriteBufferFromOwnString wb;
writeQuoted(x, wb);
return wb.str();
}
template <typename T>
static inline void writeQuoted(const DecimalField<T> & x, WriteBuffer & buf)
{
writeChar('\'', buf);
writeText(x.getValue(), x.getScale(), buf, {});
writeChar('\'', buf);
}
/** In contrast to writeFloatText (and writeQuoted),
* even if number looks like integer after formatting, prints decimal point nevertheless (for example, Float64(1) is printed as 1.).
* - because resulting text must be able to be parsed back as Float64 by query parser (otherwise it will be parsed as integer).
*
* Trailing zeros after decimal point are omitted.
*
* NOTE: Roundtrip may lead to loss of precision.
*/
static String formatFloat(const Float64 x)
{
DoubleConverter<true>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = DoubleConverter<true>::instance().ToShortest(x, &builder);
if (!result)
throw Exception(ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER, "Cannot print float or double number");
return { buffer, buffer + builder.position() };
}
String FieldVisitorToString::operator() (const Null & x) const { return x.isNegativeInfinity() ? "-Inf" : (x.isPositiveInfinity() ? "+Inf" : "NULL"); }
String FieldVisitorToString::operator() (const UInt64 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const Int64 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const Float64 & x) const { return formatFloat(x); }
String FieldVisitorToString::operator() (const String & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const DecimalField<Decimal32> & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const DecimalField<Decimal64> & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const DecimalField<Decimal128> & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const DecimalField<Decimal256> & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const Int128 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const UInt128 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const UInt256 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const Int256 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const UUID & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const IPv4 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const IPv6 & x) const { return formatQuoted(x); }
String FieldVisitorToString::operator() (const AggregateFunctionStateData & x) const { return formatQuoted(x.data); }
String FieldVisitorToString::operator() (const bool & x) const { return x ? "true" : "false"; }
String FieldVisitorToString::operator() (const CustomType & x) const { return x.toString(); }
String FieldVisitorToString::operator() (const Array & x) const
{
WriteBufferFromOwnString wb;
wb << '[';
for (Array::const_iterator it = x.begin(); it != x.end(); ++it)
{
if (it != x.begin())
wb.write(", ", 2);
wb << applyVisitor(*this, *it);
}
wb << ']';
return wb.str();
}
String FieldVisitorToString::operator() (const Tuple & x) const
{
WriteBufferFromOwnString wb;
// For single-element tuples we must use the explicit tuple() function,
// or they will be parsed back as plain literals.
if (x.size() > 1)
{
wb << '(';
}
else
{
wb << "tuple(";
}
for (auto it = x.begin(); it != x.end(); ++it)
{
if (it != x.begin())
wb << ", ";
wb << applyVisitor(*this, *it);
}
wb << ')';
return wb.str();
}
String FieldVisitorToString::operator() (const Map & x) const
{
WriteBufferFromOwnString wb;
wb << '[';
for (auto it = x.begin(); it != x.end(); ++it)
{
if (it != x.begin())
wb << ", ";
wb << applyVisitor(*this, *it);
}
wb << ']';
return wb.str();
}
String FieldVisitorToString::operator() (const Object & x) const
{
WriteBufferFromOwnString wb;
wb << '{';
for (auto it = x.begin(); it != x.end(); ++it)
{
if (it != x.begin())
wb << ", ";
writeDoubleQuoted(it->first, wb);
wb << ": " << applyVisitor(*this, it->second);
}
wb << '}';
return wb.str();
}
String convertFieldToString(const Field & field)
{
if (field.getType() == Field::Types::Which::String)
return field.get<String>();
return applyVisitor(FieldVisitorToString(), field);
}
}
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