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 %TITLE 'PRPUSH - new parse node'
MODULE PRPUSH (				! New parse node
		IDENT = '3-001'			! File: PRPUSH.BLI Edit: CJG3001
		) =
BEGIN
!COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1981, 1988.  ALL RIGHTS RESERVED.
!
!THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED ONLY
!IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE INCLUSION OF 
!THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY OTHER COPIES THEREOF MAY 
!NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY OTHER PERSON.  NO TITLE
!TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
!
!THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND 
!SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT CORPORATION.
!
!DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS 
!SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
!
!
!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	Create a new parse node.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: December 12, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 25-Feb-1981.  This module was created by
!	extracting routine PUSH from module PARSER.
! 1-002	- Regularize headers.  JBS 12-Mar-1981
! 1-003	- Use new message codes.  JBS 04-Aug-1981
! 3-001 - Fix the clear operation for TOPS-20. CJG 9-Mar-83
!--

%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$PA_CRERNGNOD,
    EDT$$PA_NEW_NOD;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

REQUIRE 'EDTSRC:PARLITS';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$PA_NEW_NOD  - new parse node'

GLOBAL ROUTINE EDT$$PA_NEW_NOD (		! New parse node
	NT, 					! Stored in [NODE_TYPE]
	TYP					! Stored in [COM_NUM]
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Create a semantic node of the specified type and subtype.  If the
!	stack overflows, return a 0 otherwise, return the address of the new
!	node.
!
! FORMAL PARAMETERS:
!
!  NT			Stored in [NODE_TYPE]
!
!  TYP			Stored in [COM_NUM]
!
! IMPLICIT INPUTS:
!
!	PA_STK
!	PA_SP
!
! IMPLICIT OUTPUTS:
!
!	PA_ERRNO
!	PA_STK
!	PA_SP
!
! ROUTINE VALUE:
!
!	0 = parse stack overflow
!	non-zero = address of new parse semantic node
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL
	PA_ERRNO,			! Error number of parsing error.
	PA_STK : BLOCKVECTOR [NUM_NODES, NODE_SIZE] FIELD (NODE_FIELDS),
	PA_SP;

    MESSAGES ((PARSTKOVF));

    LOCAL
	NODE : REF NODE_BLOCK;

    PA_SP = .PA_SP + 1;

    IF (.PA_SP GEQU NUM_NODES)
    THEN
	BEGIN
	PA_ERRNO = EDT$_PARSTKOVF;
	RETURN (0);
	END;

    NODE = PA_STK [.PA_SP, NODE_TYPE];
    CH$FILL (0, NODE_SIZE, CH$PTR (.NODE, 0, 36));
    NODE [NODE_TYPE] = .NT;
    NODE [COM_NUM] = .TYP;
    RETURN (.NODE);
    END;

%SBTTL 'EDT$$PA_CRERNGNOD  - create a range node'

GLOBAL ROUTINE EDT$$PA_CRERNGNOD (		! Create a range node
	RANTYP					! Type of range
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Create a range node of the type which has one numeric value.
!
! FORMAL PARAMETERS:
!
!  RANTYP		Type of range
!
! IMPLICIT INPUTS:
!
!	PA_CURRNG
!
! IMPLICIT OUTPUTS:
!
!	PA_CURRNG
!
! ROUTINE VALUE:
!
!	0 = unable to create the range node
!	1 = range node created
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL
	PA_CURRNG : REF NODE_BLOCK;	! the current range node

    LOCAL
	NEWRANGE : REF NODE_BLOCK;

    IF ((NEWRANGE = EDT$$PA_NEW_NOD ()) EQL 0) THEN RETURN (0);

    EDT$$CPY_MEM (NODE_SIZE, .PA_CURRNG, .NEWRANGE);
    PA_CURRNG [SUB_RANGE] = .NEWRANGE;
    PA_CURRNG [RAN_TYPE] = .RANTYP;
    PA_CURRNG [RAN_VAL] = 1;
    RETURN (1);
    END;


END
ELUDOM