Command.hpp #5

#ifndef _JAM_COMMAND_HPP_
#define _JAM_COMMAND_HPP_


#include "Rules.hpp"

/*
 * Copyright 1994 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*
 * command.h - the CMD structure and routines to manipulate them
 *
 * Both ACTION and CMD contain a rule, targets, and sources.  An
 * ACTION describes a rule to be applied to the given targets and
 * sources; a CMD is what actually gets executed by the shell.  The
 * differences are due to:
 *
 *	ACTIONS must be combined if 'actions together' is given.
 *	ACTIONS must be split if 'actions piecemeal' is given.
 *	ACTIONS must have current sources omitted for 'actions updated'.
 *
 * The CMD datatype holds a single command that is to be executed 
 * against a target, and they can chain together to represent the 
 * full collection of commands used to update a target.
 *
 * Structures:
 *
 * 	CMD - an action, ready to be formatted into a buffer and executed
 *
 * External routines:
 *
 * 	cmd_new() - return a new CMD or 0 if too many args
 *	cmd_free() - delete CMD and its parts
 *	cmd_next() - walk the CMD chain
 */

/*
 * CMD - an action, ready to be formatted into a buffer and executed
 */

namespace Jam
{
	class Command
	{
	public:
		static Command* CreateInstance(
			RULE	*rule,		/* rule (referenced) */
			Jam::List	*targets,	/* $(<) (freed) */
			Jam::List	*sources,	/* $(>) (freed) */
			Jam::List	*shell );	/* $(SHELL) (freed) */

		static void DeleteInstance(Command* pInstance);

		Command* GetNext(void) const;

	public:
		Command	*next;
		Command	*tail;		/* valid on in head */
		RULE	*rule;		/* rule->actions contains shell script */
		Jam::List	*shell;		/* $(SHELL) value */
		LOL	args;		/* LISTs for $(<), $(>) */
		char	buf[ MAXLINE ];	/* actual commands */
	} ;
}


#endif _JAM_COMMAND_HPP_