corelib/include/ebcl/SRDIO.hh

/******************************************************************************/
/* SRD - INPUT AND OUTPUT *****************************************************/
/******************************************************************************/

#ifndef _H_EBCL_SRDIO
#define _H_EBCL_SRDIO
#include <ebcl/SRDData.hh>
namespace ebcl {


/*= INPUT / OUTPUT ABSTRACTIONS ==============================================*/

// A_SRDWriter - Abstract SRD writer
class A_SRDWriter
{
   protected:
	A_SRDWriter( ) = default;

   public:
	A_SRDWriter( A_SRDWriter const& ) = delete;
	A_SRDWriter( A_SRDWriter&& ) = delete;

	virtual ~A_SRDWriter( ) = 0;

	virtual A_SRDWriter& start( ) = 0;

	virtual A_SRDWriter& startList( ) = 0;
	virtual A_SRDWriter& endList( ) = 0;

	A_SRDWriter& putList( T_SRDList const& list );
	A_SRDWriter& putToken( T_SRDToken const& token );

	virtual A_SRDWriter& putText( T_String const& text ) = 0;
	virtual A_SRDWriter& putWord( T_String const& word ) = 0;
	virtual A_SRDWriter& putString( T_String const& string ) = 0;

	virtual A_SRDWriter& putComment( T_String const& comment ) = 0;

	virtual A_SRDWriter& putVariable( T_String const& var ) = 0;

	virtual A_SRDWriter& putBinary( T_Buffer< uint8_t > const& binary ) = 0;

	virtual A_SRDWriter& putInteger( int64_t value ) = 0;
	virtual A_SRDWriter& putInt32( int32_t value ) = 0;
	virtual A_SRDWriter& putInt64( int64_t value ) = 0;

	virtual A_SRDWriter& putFloat( double value ) = 0;

	virtual A_SRDWriter& end( ) = 0;
};
M_ABSTRACT_POINTERS( SRDWriter );

/*----------------------------------------------------------------------------*/

// A_SRDReaderTarget - Abstract token receiver for SRD readers
class A_SRDReaderTarget
{
   public:
	virtual ~A_SRDReaderTarget( ) = 0;
	virtual void start( T_SRDErrors& errors ) = 0;
	virtual void push( T_SRDErrors& errors , T_SRDToken&& token ) = 0;
	virtual void end( T_SRDErrors& errors ) = 0;
};
M_ABSTRACT_POINTERS( SRDReaderTarget );

/*----------------------------------------------------------------------------*/

// A_SRDReader - Abstract token reader
class A_SRDReader
{
   protected:
	A_SRDReaderTarget& target_;

   public:
	A_SRDReader( A_SRDReaderTarget& target );

	virtual ~A_SRDReader( ) = 0;
	virtual void read( T_String const& name , A_InputStream& input ) = 0;
};
M_ABSTRACT_POINTERS( SRDReader );

/*----------------------------------------------------------------------------*/

// X_SRDWriterError - SRD writer exception
class X_SRDWriterError : public std::exception
{
   private:
	char const* msg_;

   public:
	X_SRDWriterError( char const* msg ) noexcept;

	X_SRDWriterError( ) = delete;
	X_SRDWriterError( X_SRDWriterError const& ) = default;
	X_SRDWriterError( X_SRDWriterError&& ) = default;

	char const * what( ) const noexcept override;
};


/*= HELPERS ==================================================================*/

// T_SRDReaderTargetHelper - Calls start() and end() using RAII
class T_SRDReaderTargetHelper
{
   private:
	A_SRDReaderTarget& target_;
	T_SRDErrors& errors_;

   public:
	T_SRDReaderTargetHelper( A_SRDReaderTarget& target , T_SRDErrors& errors );
	~T_SRDReaderTargetHelper( );
};

/*----------------------------------------------------------------------------*/

// T_SRDListFixer - A stage that adds missing EOL's and discards extraneous
// EOL's, emitting errors as it does so.
class T_SRDListFixer final : public A_SRDReaderTarget
{
    private:
	A_SRDReaderTarget& output_;
	T_AutoArray< T_SRDLocation , 32 > listStarts_;

    public:
	explicit T_SRDListFixer( A_SRDReaderTarget& output ) noexcept;

	void start( T_SRDErrors& errors ) override;
	void push( T_SRDErrors& errors ,
			T_SRDToken&& token ) override;
	void end( T_SRDErrors& errors ) override;
};

/*----------------------------------------------------------------------------*/

// T_SRDMemoryTarget - Stores the reader's output as a T_SRDList
class T_SRDMemoryTarget : public A_SRDReaderTarget
{
   private:
	const bool structured_;
	bool clearFlushToken_;
	T_SRDToken list_;
	RP_SRDToken current_;
	T_Array< RP_SRDToken > stack_;

   public:
	// If structured is set, the generated token list will include sub-lists
	// as E_SRDTokenType::LIST tokens; if it isn't, the list will feature
	// only start and end of list tokens.
	explicit T_SRDMemoryTarget( bool structured = true );

	// Set/get flush token handling
	void clearFlushToken( bool clearIt ) noexcept;
	bool clearFlushToken( ) const noexcept;

	void start( T_SRDErrors& errors ) override;
	void push( T_SRDErrors& errors , T_SRDToken&& token ) override;
	void end( T_SRDErrors& errors ) override;

	// Get the list
	T_SRDList const& list( ) const;
	// Does the list only contains complete items?
	bool complete( ) const;
};
M_CLASS_POINTERS( SRDMemoryTarget );

/*----------------------------------------------------------------------------*/

// T_SRDWriterTarget - Forwards token that are read to a writer
class T_SRDWriterTarget : public A_SRDReaderTarget
{
   private:
	A_SRDWriter& writer_;

   public:
	explicit T_SRDWriterTarget( A_SRDWriter& writer );

	void start( T_SRDErrors& errors ) override;
	void push( T_SRDErrors& errors , T_SRDToken&& token ) override;
	void end( T_SRDErrors& errors ) override;
};
M_CLASS_POINTERS( SRDWriterTarget );


} // namespace
#include <ebcl/inline/SRDIO.hh>
#endif // _H_EBCL_SRDIO