129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
/*
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* $Id$
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Harbour Project source code
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This file is a part of Harbour Runtime Library and it contains code
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that defined DO function ussed in DO <proc> WITH statement.
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Copyright (C) 1999 Ryszard Glab
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www - http://www.harbour-project.org
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version, with one exception:
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The exception is that if you link the Harbour Runtime Library (HRL)
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and/or the Harbour Virtual Machine (HVM) with other files to produce
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an executable, this does not by itself cause the resulting executable
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to be covered by the GNU General Public License. Your use of that
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executable is in no way restricted on account of linking the HRL
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and/or HVM code into it.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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their web site at http://www.gnu.org/).
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*/
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#include "extend.h"
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#include "itemapi.h"
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#include "errorapi.h"
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#include "ctoharb.h"
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/* $DOC$
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* $FUNCNAME$
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* DO()
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* $CATEGORY$
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* Utility
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* $ONELINER$
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* Calls a procedure or a function
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* $SYNTAX$
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* DO( <xFuncProc> [, <xArguments...>] )
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* $ARGUMENTS$
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* <xFuncProc> = Either a string with a function/procedure name to be called
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* or a codeblock to evaluate
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* <xArguments> = arguments passed to a called function/procedure or to
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* a codeblock
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* $RETURNS$
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* A value that was returned from called function
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* $DESCRIPTION$
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* This function can be called either by the harbour compiler or by user.
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* The compiler always passes the item of IT_SYMBOL type that stores the
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* name of procedure specified in DO <proc> WITH ... statement.
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* If called procedure/function doesn't exist then the runtime error
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* is generated.
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* This function can be used as replacement of macro operator.
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* It is also used internally to implement DO <proc> WITH <args...>
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* In this case <xFuncProc> is of type HB_SYMB
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* $EXAMPLES$
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* cbCode ={|x| MyFunc( x )}
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* DO( cbCode, 1 )
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*
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* cFunction := "MyFunc"
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* xRetVal :=DO( cFunction, 2 )
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*
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* Old style (slower):
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* DO &cFunction WITH 3
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*
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* $TESTS$
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*
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* $STATUS$
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*
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* $COMPLIANCE$
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*
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* $SEEALSO$
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*
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* $END$
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*/
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HARBOUR HB_DO( void )
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{
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PHB_ITEM pItem = hb_param( 1, IT_ANY );
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if( IS_STRING( pItem ) )
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{
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PHB_DYNS pDynSym = hb_dynsymGet( pItem->item.asString.value );
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if( pDynSym )
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{
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int i;
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hb_vmPushSymbol( pDynSym->pSymbol );
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hb_vmPushNil();
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for( i = 2; i <= hb_pcount(); i++ )
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hb_vmPush( hb_param( i, IT_ANY ) );
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hb_vmDo( hb_pcount() - 1 );
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}
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else
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hb_errRT_BASE( EG_NOFUNC, 1001, NULL, pItem->item.asString.value );
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}
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else if( IS_BLOCK( pItem ) )
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{
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int i;
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hb_vmPushSymbol( &symEval );
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hb_vmPush( pItem );
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for( i = 2; i <= hb_pcount(); i++ )
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hb_vmPush( hb_param( i, IT_ANY ) );
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hb_vmDo( hb_pcount() - 1 );
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}
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else if( IS_SYMBOL( pItem ) )
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{
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int i;
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hb_vmPushSymbol( pItem->item.asSymbol.value );
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hb_vmPushNil();
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for( i = 2; i <= hb_pcount(); i++ )
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hb_vmPush( hb_param( i, IT_ANY ) );
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hb_vmDo( hb_pcount() - 1 );
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}
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else
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hb_errRT_BASE( EG_ARG, 3012, NULL, "DO" );
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}
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