hawk/hawk/lib/Hawk-Sed.hpp

/*
 * $Id$
 *
    Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
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    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
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 */

#ifndef _HAWK_SED_HPP_
#define _HAWK_SED_HPP_

#include <hawk-sed.h>
#include <Hawk.hpp>

/// \file
/// This file defines C++ classes that you can use when you create a stream
/// editor. The C++ classes encapsulates the C data types and functions in 
/// a more object-oriented manner.
///
/// \todo support sed tracer
///

/////////////////////////////////
HAWK_BEGIN_NAMESPACE(HAWK)
/////////////////////////////////

///
/// The Sed class implements a stream editor by wrapping around #hawk_hawk_sed_t.
///
class HAWK_EXPORT Sed: public Uncopyable, public Mmged
{
public:
	///
	/// The Stream class is a abstract class for I/O operation during
	/// execution.
	///
	class HAWK_EXPORT Stream
	{
	public:
		/// The Mode type defines I/O modes.
		enum Mode
		{
			READ,  ///< open for read
			WRITE  ///< open for write
		};

		/// The Data class conveys information need for I/O operations. 
		class HAWK_EXPORT Data
		{
		public:
			friend class Sed;

		protected:
			Data (Sed* sed, Mode mode, hawk_sed_io_arg_t* arg):
				sed (sed), mode (mode), arg (arg) {}

		public:
			/// The getMode() function returns the I/O mode
			/// requested.
			Mode getMode() const { return this->mode; }

			/// The getHandle() function returns the I/O handle 
			/// saved by setHandle().
			void* getHandle () const { return this->arg->handle; }

			/// The setHandle() function sets an I/O handle
			/// typically in the Stream::open() function. 
			void setHandle (void* handle) { this->arg->handle = handle; }

			/// The getName() function returns an I/O name.
			/// \return #HAWK_NULL for the main data stream,
			///         file path for explicit file stream
			const hawk_ooch_t* getName () const { return this->arg->path; }

			/// The Sed* operator returns the associated Sed class.
			operator Sed* () const { return this->sed; }

			/// The hawk_sed_t* operator returns a pointer to the 
			/// underlying stream editor.
			operator hawk_sed_t* () const { return this->sed->getHandle(); }

			operator hawk_gem_t* () const { return hawk_sed_getgem(this->sed->getHandle()); }

		protected:
			Sed* sed;
			Mode mode;
			hawk_sed_io_arg_t* arg;
		};

		/// The Stream() function constructs a stream.
		Stream () {}

		/// The Stream() function destructs a stream.
		virtual ~Stream () {}

		/// The open() function should be implemented by a subclass
		/// to open a stream. It can get the mode requested by calling
		/// the Data::getMode() function over the I/O parameter \a io.
		///
		/// The return value of 0 may look a bit tricky. Easygoers 
		/// can just return 1 on success and never return 0 from open().
		/// - If 0 is returned for the #READ mode, Sed::execute()
		///   returns success after having called close() as it has
		///   opened a console but has reached EOF.
		/// - If 0 is returned for the #WRITE mode and there are
		///   any write() calls, the Sed::execute() function returns
		///   failure after having called close() as it cannot write
		///   further on EOF.
		///
		/// \return -1 on failure, 1 on success, 
		///         0 on success but reached EOF.
		virtual int open (Data& io) = 0;

		/// The close() function should be implemented by a subclass
		/// to open a stream.
		virtual int close (Data& io) = 0;

		virtual hawk_ooi_t read (Data& io, hawk_ooch_t* buf, hawk_oow_t len) = 0;
		virtual hawk_ooi_t write (Data& io, const hawk_ooch_t* buf, hawk_oow_t len) = 0;

	private:
		Stream (const Stream&);
		Stream& operator= (const Stream&);
	};

	///
	/// The Sed() function creates an uninitialized stream editor.
	///
	Sed (Mmgr* mmgr);

	///
	/// The ~Sed() function destroys a stream editor. 
	/// \note The close() function is not called by this destructor.
	///       To avoid resource leaks, You should call close() before
	///       a stream editor is destroyed if it has been initialized
	///       with open().
	///
	virtual ~Sed () {}


	hawk_cmgr_t* getCmgr () const;
	void setCmgr (hawk_cmgr_t* cmgr);

	///
	/// The open() function initializes a stream editor and makes it
	/// ready for subsequent use.
	/// \return 0 on success, -1 on failure.
	///
	int open ();

	///
	/// The close() function finalizes a stream editor.
	///
	void close ();

	///
	/// The compile() function compiles a script from a stream 
	/// \a iostream.
	/// \return 0 on success, -1 on failure
	///
	int compile (Stream& sstream);

	///
	/// The execute() function executes compiled commands over the I/O
	/// streams defined through I/O handlers
	/// \return 0 on success, -1 on failure
	///
	int execute (Stream& iostream);

	///
	/// The halt() function makes a request to break a running loop
	/// inside execute(). Note that this does not affect blocking 
	/// operations in user-defined stream handlers.
	///
	void halt ();

	///
	/// The isHalt() function returns true if halt() has been called
	/// since the last call to execute(), false otherwise.
	///
	bool isHalt () const;

	///
	/// The getTrait() function gets the current traits.
	/// \return 0 or current options ORed of #trait_t enumerators.
	///
	int getTrait () const;

	///
	/// The setTrait() function sets traits for a stream editor.
	/// The option code \a opt is 0 or OR'ed of #trait_t enumerators.
	///
	void setTrait (
		int trait ///< option code
	);

	///
	/// The getErrorMessage() function gets the description of the last 
	/// error occurred. It returns an empty string if the stream editor
	/// has not been initialized with the open() function.
	///
	const hawk_ooch_t* getErrorMessage() const;
	const hawk_uch_t* getErrorMessageU () const;
	const hawk_bch_t* getErrorMessageB () const;

	///
	/// The getErrorLocation() function gets the location where
	/// the last error occurred. The line and the column of the #hawk_loc_t 
	/// structure retruend are 0 if the stream editor has not been 
	/// initialized with the open() function.
	///
	hawk_loc_t getErrorLocation () const;

	///
	/// The getErrorNumber() function gets the number of the last 
	/// error occurred. It returns HAWK_SED_ENOERR if the stream editor
	/// has not been initialized with the open() function.
	///
	hawk_errnum_t getErrorNumber () const;

	///
	/// The setError() function sets information on an error occurred.
	///
	void setError (
		hawk_errnum_t      num,             ///< error number
		const hawk_oocs_t* args = HAWK_NULL, ///< string array for formatting
		                               ///  an error message
		const hawk_loc_t*  loc = HAWK_NULL   ///< error location
	);

	const hawk_ooch_t* getCompileId () const;

	const hawk_ooch_t* setCompileId (
		const hawk_ooch_t* id
	);

	///
	/// The getConsoleLine() function returns the current line
	/// number from an input console. 
	/// \return current line number
	///
	hawk_oow_t getConsoleLine ();

	///
	/// The setConsoleLine() function changes the current line
	/// number from an input console. 
	///
	void setConsoleLine (
		hawk_oow_t num ///< a line number
	);

protected:
	///
	/// The getErrorString() function returns an error formatting string
	/// for the error number \a num. A subclass wishing to customize
	/// an error formatting string may override this function.
	/// 
	virtual const hawk_ooch_t* getErrorString (
		hawk_errnum_t num ///< an error number
	) const;

public:
	// use this with care
	hawk_sed_t* getHandle() const { return this->sed; }

protected:
	hawk_cmgr_t* _cmgr;
	/// handle to a primitive sed object
	hawk_sed_t* sed;
	/// default error formatting string getter
	hawk_errstr_t dflerrstr; 
	/// Stream to read script from
	Stream* sstream;
	/// I/O stream to read data from and write output to.
	Stream* iostream;


private:

	static hawk_ooi_t sin (hawk_sed_t* s, hawk_sed_io_cmd_t cmd, hawk_sed_io_arg_t* arg, hawk_ooch_t* buf, hawk_oow_t len);
	static hawk_ooi_t xin (hawk_sed_t* s, hawk_sed_io_cmd_t cmd, hawk_sed_io_arg_t* arg, hawk_ooch_t* buf, hawk_oow_t len);
	static hawk_ooi_t xout (hawk_sed_t* s, hawk_sed_io_cmd_t cmd, hawk_sed_io_arg_t* arg, hawk_ooch_t* dat, hawk_oow_t len);
	static const hawk_ooch_t* xerrstr (hawk_sed_t* s, hawk_errnum_t num);
};


///
/// The StdSed class inherits the Sed class, implements a standard
/// I/O stream class, and sets the default memory manager.
///
class HAWK_EXPORT SedStd: public Sed
{
public:
	SedStd (Mmgr* mmgr = MmgrStd::getDFL()): Sed(mmgr) {}

	///
	/// The FileStream class implements a stream over input
	/// and output files.
	///
	class HAWK_EXPORT FileStream: public Stream
	{
	public:
		FileStream (const hawk_ooch_t* infile = HAWK_NULL,
		            const hawk_ooch_t* outfile = HAWK_NULL,
		            hawk_cmgr_t* cmgr = HAWK_NULL): 
			infile(infile), outfile(outfile), cmgr(cmgr) 
		{
		}

		int open (Data& io);
		int close (Data& io);
		hawk_ooi_t read (Data& io, hawk_ooch_t* buf, hawk_oow_t len);
		hawk_ooi_t write (Data& io, const hawk_ooch_t* buf, hawk_oow_t len);

	protected:
		const hawk_ooch_t* infile;
		const hawk_ooch_t* outfile;
		hawk_cmgr_t*   cmgr;
	};

	///
	/// The StringStream class implements a stream over a string
	///
	class HAWK_EXPORT StringStream: public Stream
	{
	public:
		StringStream (const hawk_ooch_t* in);
		StringStream (const hawk_ooch_t* in, hawk_oow_t len);
		~StringStream ();

		int open (Data& io);
		int close (Data& io);
		hawk_ooi_t read (Data& io, hawk_ooch_t* buf, hawk_oow_t len);
		hawk_ooi_t write (Data& io, const hawk_ooch_t* buf, hawk_oow_t len);

		const hawk_ooch_t* getInput (hawk_oow_t* len = HAWK_NULL) const;
		const hawk_ooch_t* getOutput (hawk_oow_t* len = HAWK_NULL) const;

	protected:
		struct
		{
			const hawk_ooch_t* ptr; 
			const hawk_ooch_t* end; 
			const hawk_ooch_t* cur;
		} in;

		struct
		{
			bool inited;
			hawk_ooecs_t buf;
		} out;
	};
};

/////////////////////////////////
HAWK_END_NAMESPACE(HAWK)
/////////////////////////////////

#endif