/****************************************************************
 *								*
 *	Copyright 2001, 2011 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

#include "mdef.h"
#include "compiler.h"
#include "opcode.h"
#include "zstep.h"
#include "toktyp.h"
#include "nametabtyp.h"
#include "mdq.h"
#include "advancewindow.h"
#include "cmd.h"
#include "namelook.h"

GBLREF short int 	source_column;

error_def(ERR_INVZSTEP);
error_def(ERR_ZSTEPARG);

static readonly nametabent zstep_names[] =
{
	 { 1, "I"}, { 4, "INTO"}
	,{ 2,"OU" }, { 5,"OUTOF" }
	,{ 2,"OV" }, { 4,"OVER" }
};
static readonly unsigned char zstep_index[27] =
{
	0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2
	,2, 2, 6, 6, 6, 6, 6, 6, 6, 6, 6
	,6, 6, 6
};

static readonly char zstep_type[]={ ZSTEP_INTO, ZSTEP_INTO,
				    ZSTEP_OUTOF, ZSTEP_OUTOF,
				    ZSTEP_OVER, ZSTEP_OVER
};

int m_zstep(void)
{
	char	type;
	int	x;
	oprtype action;
	opctype	op;
	triple *head;
	DCL_THREADGBL_ACCESS;

	SETUP_THREADGBL_ACCESS;
	assert((SIZEOF(zstep_names) / SIZEOF(nametabent)) == zstep_index[26]);
	op = OC_ZSTEP;
	switch (TREF(window_token))
	{
	case TK_SPACE:
	case TK_EOL:
		type = ZSTEP_OVER;
		break;
	case TK_IDENT:
		if (0 > (x = namelook(zstep_index, zstep_names, (TREF(window_ident)).addr, (TREF(window_ident)).len)))
		{	/* NOTE assignment above*/
			stx_error(ERR_INVZSTEP);
			return FALSE;
		}
		type = zstep_type[x];
		advancewindow();
		break;
	default:
		stx_error(ERR_ZSTEPARG);
		return FALSE;
		break;
	}
	if (TK_COLON == TREF(window_token))
	{	advancewindow();
		if (EXPR_FAIL == expr(&action, MUMPS_EXPR))
			return FALSE;
		op = OC_ZSTEPACT;
	}
	head = maketriple(op);
	head->operand[0] = put_ilit(type);
	if (OC_ZSTEPACT == op)
		head->operand[1] = action;
	ins_triple(head);
	return TRUE;
}