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Simplify the delimiters

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This commit is contained in:
ADAM David Alan Martin
2023-10-31 02:17:27 -04:00
parent 4a74921cb8
commit bb51660272
6 changed files with 64 additions and 145 deletions
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2
IOStreams/IStreamable.h
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@ -34,7 +34,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: istreamable_module
const auto commentChar= line.find( "#" );
if( commentChar != std::string::npos ) line= line.substr( line.find( "#" ) );
const auto delim= getFieldDelimiter( is );
const auto delim= getDelimiter( fieldDelimiter, is );
const auto tokens= split( line, delim );
auto decomposed= Alepha::Reflection::tuplizeAggregate( istreamable );

2
IOStreams/OStreamable.h
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@ -45,7 +45,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: ostreamable_module
// aggregates, so we'll go with this simple case for now...
tuple_for_each( decomposed ) <=[&]( const auto &element )
{
if( not first ) os << FieldDelimiter;
if( not first ) os << fieldDelimiter;
first= false;
os << element;
};

12
IOStreams/OStreamable.test/0.cc
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@ -31,8 +31,9 @@ namespace
stringify_specific( const Agg &agg, const std::string delim )
{
std::ostringstream oss;
Alepha::IOStreams::setGlobalFieldDelimiter( "YOU SHOULD NOT SEE THIS" );
oss << Alepha::IOStreams::setFieldDelimiter( delim );
using Alepha::IOStreams::fieldDelimiter;
Alepha::IOStreams::setGlobalDelimiter( fieldDelimiter, "YOU SHOULD NOT SEE THIS" );
oss << Alepha::IOStreams::setDelimiter( fieldDelimiter, delim );
oss << agg;
return std::move( oss ).str();
}
@ -41,7 +42,8 @@ namespace
stringify_global( const Agg &agg, const std::string delim )
{
std::ostringstream oss;
Alepha::IOStreams::setGlobalFieldDelimiter( delim );
using Alepha::IOStreams::fieldDelimiter;
Alepha::IOStreams::setGlobalDelimiter( fieldDelimiter, delim );
oss << agg;
return std::move( oss ).str();
}
@ -81,8 +83,8 @@ static auto init= Alepha::Utility::enroll <=[]
[]( const Agg agg, const std::string delim )
{
using Alepha::IOStreams::String;
using Alepha::IOStreams::setFieldDelimiter;
return String{} << setFieldDelimiter( delim ) << agg << FinishString;
using Alepha::IOStreams::fieldDelimiter;
return String{} << setDelimiter( fieldDelimiter, delim ) << agg << FinishString;
}
>
::Cases

39
IOStreams/StreamState.h
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@ -11,7 +11,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
{
inline namespace exports
{
template< typename Tag, typename Type, auto Default= [] { return Type{}; } >
template< typename >
class StreamState;
}
@ -20,7 +20,14 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
{
private:
const int index= std::ios::xalloc();
std::function< Type () > build;
public:
explicit
StreamState( const std::function< Type () > build )
: build( build ) {}
private:
static Type *&
get_ptr( std::ios_base &ios, const int idx )
{
@ -30,7 +37,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
Type *&
get_ptr( std::ios_base &ios )
{
get_ptr( ios, index );
return get_ptr( ios, index );
}
static void
@ -50,7 +57,7 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
}
else if( event == std::ios_base::copyfmt_event )
{
get_ptr( ios, idx )= new Type{ get( ios, idx ) };
get_ptr( ios, idx )= new Type{ *get_ptr( ios, idx ) };
}
}
@ -63,13 +70,13 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
void
init( std::ios_base &ios )
{
if( not ios.iword( idx ) )
if( not ios.iword( index ) )
{
ios.iword( index() )= 1;
ios.register_callback( callback, idx );
ios.iword( index )= 1;
ios.register_callback( callback, index );
}
auto *&ptr= get_ptr( ios, idx );
if( not ptr ) ptr= new Type{ Default() };
auto *&ptr= get_ptr( ios, index );
if( not ptr ) ptr= new Type{ build() };
}
public:
@ -80,6 +87,12 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
return *get_ptr( ios );
}
void
setDefault( const Type value )
{
build= [value] { return value; };
}
struct Setter
{
StreamState *state;
@ -88,17 +101,23 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: stream_state
friend std::ostream &
operator << ( std::ostream &os, const Setter &s )
{
s.get( os )= s.val;
s.state->get( os )= s.val;
return os;
}
friend std::istream &
operator >> ( std::istream &is, const Setter &s )
{
s.get( is )= s.val;
s.state->get( is )= s.val;
return is;
}
};
auto
makeSetter( const Type val )
{
return Setter{ this, val };
}
};
}

148
IOStreams/delimiters.h
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@ -24,146 +24,44 @@ namespace Alepha::Hydrogen::IOStreams ::detail:: delimiters_m
struct Delimiter : boost::noncopyable
{
std::string current;
StreamState state;
StreamState< std::string > state;
explicit
Delimiter( const std::string current )
: current( current )
{
}
Delimiter( const std::string dflt )
: state( [dflt] { return dflt; } ) {}
};
template< ConstexprString s >
using CreateDelimiter= void ( const DelimiterParamType< s > & );
template< typename T >
constexpr is_delimiter_v= false;
template< ConstexprString s >
constexpr is_delimiter_v< CreateDelimiter< s > >;
inline StaticValue< std::map< void (*)( const DelimiterBase & ), StreamState< Delim, std::string, globalDelimiter<
template< typename Delimiter >
using DelimiterStateByValue= StreamState< Delim, std::string, globalDelimiter< Delim > >;
inline namespace exports
{
Delimiter< "\t"_cs > FieldDelimiter;
Delimiter< "\t"_cs > FieldDelimiter2;
static_assert( FieldDelimiter != FieldDelimiter2 );
Delimiter< "\n"_cs > RecordDelimiter;
}
namespace storage
{
template< auto Delim >
inline StaticValue< std::optional< std::string > > globalDelimiter;
}
template< auto Delim >
std::string &
globalDelimiter()
{
if( not storage::globalDelimiter< Delim >().has_value() )
{
storage::globalDelimiter()= std::string{} + static_cast< char >( Delim );
}
assert( storage::globalDelimiter< Delim >().has_value() );
return storage::globalFieldDelimiter().value();
}
namespace exports
{
template< auto Delim >
void
setGlobaDelimiter( const std::string delim )
{
storage::globalDelimiter< Delim >()= delim;
}
}
template< auto Delim >
using DelimiterStateByValue= StreamState< Delim, std::string, globalDelimiter< Delim > >;
template< typename DelimType >
using DelimiterState= StreamState< Delim, std::string, globalDelimiter >;
struct DelimWrap
{
template< typename Delim >
Delim val;
};
std::ostream &
operator << ( std::ostream &os, auto DelimVal )
{
return os << DelimiterState< decltype( DelimVal ) >::get( os );
}
namespace exports
{
auto
setFieldDelimiter( const std::string delim )
{
return FieldDelimiterState::Setter{ delim };
}
const auto &
getFieldDelimiter( std::ios_base &ios )
{
return FieldDelimiterState::get( ios );
}
}
inline const int recordIndex= std::ios::xalloc();
inline void
setRecordDelimiterOnIOS( std::ios &ios, const char ch )
{
ios.iword( recordIndex )= ch;
}
inline char
getRecordDelimiter( std::ios &ios )
{
if( ios.iword( recordIndex ) == 0 ) setRecordDelimiterOnIOS( ios, globalRecordDelimiter() );
return ios.iword( recordIndex );
inline Delimiter fieldDelimiter{ "\t" };
inline Delimiter recordDelimiter{ "\n" };
}
inline std::ostream &
operator << ( std::ostream &os, decltype( RecordDelimiter ) )
operator << ( std::ostream &os, Delimiter &delim )
{
return os << getRecordDelimiter( os );
const auto &s= delim.state.get( os );
return os << s;
}
struct RecordDelimiterSetter
{
const char ch;
friend std::ostream &
operator << ( std::ostream &os, const RecordDelimiterSetter &s )
{
setRecordDelimiterOnIOS( os, s.ch );
return os;
}
};
namespace exports
{
auto
setRecordDelimiter( const char ch )
inline std::string
getDelimiter( Delimiter &delim, std::ios_base &ios )
{
return RecordDelimiterSetter{ ch };
return delim.state.get( ios );
}
inline auto
setDelimiter( Delimiter &delim, const std::string s )
{
return delim.state.makeSetter( s );
}
inline void
setGlobalDelimiter( Delimiter &delim, const std::string s )
{
return delim.state.setDefault( s );
}
}
}

6
IOStreams/streamable.test/0.cc
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@ -31,14 +31,14 @@ namespace
std::string
roundTripString( const std::string text, const std::string delim )
{
using namespace Alepha::IOStreams::exports::delimiters;
using namespace Alepha::IOStreams::exports::delimiters_m;
std::istringstream iss{ text };
Agg agg;
iss >> setFieldDelimiter( delim ) >> agg;
iss >> setDelimiter( fieldDelimiter, delim ) >> agg;
std::ostringstream oss;
oss << setFieldDelimiter( delim ) << agg;
oss << setDelimiter( fieldDelimiter, delim ) << agg;
return oss.str();
}