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Start to migrate delimiter code to common helper.

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This commit is contained in:
ADAM David Alan Martin
2023-10-25 03:40:57 -04:00
parent 2bbaa65d68
commit 5e86b58987
3 changed files with 116 additions and 38 deletions
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45
IOStreams/delimiters.h
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@ -10,6 +10,8 @@ static_assert( __cplusplus > 2020'00 );
#include <Alepha/StaticValue.h>
#include <Alepha/IOStreams/StreamState.h>
namespace Alepha::Hydrogen::IOStreams ::detail:: delimiters
{
inline namespace exports
@ -18,19 +20,21 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: delimiters
enum { RecordDelimiter };
}
using FieldDelimiterState= StreamState< decltype( FieldDelimiter ), std::string >;
namespace C
{
const char defaultFieldDelimiter= '\t';
const std::string defaultFieldDelimiter= "\t";
const char defaultRecordDelimiter= '\n';
}
namespace storage
{
inline StaticValue< std::optional< char > > globalFieldDelimiter;
inline StaticValue< std::optional< std::string > > globalFieldDelimiter;
inline StaticValue< std::optional< char > > globalRecordDelimiter;
}
inline char
inline std::string
globalFieldDelimiter()
{
if( not storage::globalFieldDelimiter().has_value() ) storage::globalFieldDelimiter()= C::defaultFieldDelimiter;
@ -43,48 +47,19 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: delimiters
if( not storage::globalRecordDelimiter().has_value() ) storage::globalRecordDelimiter()= C::defaultRecordDelimiter;
return storage::globalRecordDelimiter().value();
}
inline const int fieldIndex= std::ios::xalloc();
inline void
setFieldDelimiterOnIOS( std::ios &ios, const char ch )
{
ios.iword( fieldIndex )= ch;
}
inline char
getFieldDelimiter( std::ios &ios )
{
if( ios.iword( fieldIndex ) == 0 ) setFieldDelimiterOnIOS( ios, globalFieldDelimiter() );
return ios.iword( fieldIndex );
}
inline std::ostream &
operator << ( std::ostream &os, decltype( FieldDelimiter ) )
{
return os << getFieldDelimiter( os );
return os << FieldDelimiterState::get( os );
}
struct FieldDelimiterSetter
{
const char ch;
friend std::ostream &
operator << ( std::ostream &os, const FieldDelimiterSetter &s )
{
setFieldDelimiterOnIOS( os, s.ch );
return os;
}
};
namespace exports
{
auto
setFieldDelimiter( const char ch )
setFieldDelimiter( const std::string delim )
{
return FieldDelimiterSetter{ ch };
return FieldDelimiterState::Setter{ delim };
}
}