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Trailing-Edge - PDP-10 Archives - BB-R775C-BM - sources/chmspllin.bli
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 %TITLE 'CHMSPLLIN - split line'
MODULE CHMSPLLIN (				! Split line
		IDENT = '3-001'			! File: CHMSPLLIN.BLI Edit: GB3001
		) =
BEGIN
!
!			  COPYRIGHT (c) 1981, 1985 BY
!	      DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
!		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 WHICH IS NOT SUPPLIED BY DIGITAL.
!

!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	This module splits a line of text at the current cursor position.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: Unknown
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 04-Feb-1981.  This module was created by
!	extracting the routines EDT$$SPLT_LN  and SPLIT_LINE from
!	module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 03-Mar-1981
! 1-003	- Change SPLIT_LINE to EDT$$SPLT_LNINS .  JBS 27-Mar-1981
! 1-004	- Use the ASSERT macro.  JBS 01-Jun-1981
! 1-005	- EDT$$SEL_RNGPOS  has 3 values.  JBS 02-Jun-1981
! 1-006	- New screen update logic.  JBS 13-Sep-1982
! 1-007	- Remove EDT$$G_LN_NO for new screen update logic.  JBS 29-Sep-1982
! 1-008 - Make code dependent on length of inserted line.  SMB 16-Nov-1982
! 1-009 - Reorganize to fix bugs in line numbering.  SMB 17-Nov-1982
! 1-010	- Save the end of the old line in heap storage rather than
!	   on the stack.  Saving it on the stack uses too much
!	   stack on the PDP-11.  JBS 18-Nov-1982
! 1-011	- Change the call to EDT$$MRK_LNCHG.  JBS 27-Dec-1982
! 1-012	- Do things the stupid way if there is a select active, so tha.
!	   the select range will be updated properly.  JBS 22-Feb-1983
! 3-001 - Add updates from V3 sources.  GB 27-Apr-1983
!--
%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$SPLT_LN : NOVALUE,			! Split a line of text at the current cursor position
    EDT$$SPLT_LNINS : NOVALUE;			! Split a line of text at the current cursor position

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routines
%SBTTL 'EDT$$SPLT_LN  - split line'

GLOBAL ROUTINE EDT$$SPLT_LN 			! Split line
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Split a line of text at the current cursor position.
!
!	The characters in front of the cursor become a new line, inserted
!	in front of the current one.  The cursor is left on the original
!	line.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	LN_BUF
!	LN_END
!	LN_PTR
!
! IMPLICIT OUTPUTS:
!
!	LN_PTR
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$MRK_LNCHG : NOVALUE,		! Track line update bounds
	EDT$$UPD_LNLEN : NOVALUE,		! Update the length of the current line
	EDT$$INS_LN;				! Insert a line into buffer
    EXTERNAL
	LN_BUF,				! Current line buffer
	LN_END,				! End of current line pointer
	LN_PTR;				! Current character pointer

    LOCAL
	LEN;

!+
! Get length of the new line.
!-
    LEN = CH$DIFF (.LN_PTR, CH$PTR (LN_BUF, 0, BYTE_SIZE));

!+
! Insert the new line.
!-
    EDT$$INS_LN (CH$PTR (LN_BUF, 0, BYTE_SIZE), .LEN);

    IF (.LEN NEQ 0)
    THEN
	BEGIN
	EDT$$CPY_STR (CH$DIFF (.LN_END, .LN_PTR), .LN_PTR, CH$PTR (LN_BUF, 0, BYTE_SIZE));
	EDT$$MRK_LNCHG (SCR_EDIT_MODIFY, 0);
	EDT$$UPD_LNLEN (-.LEN);
	END;

    LN_PTR = CH$PTR (LN_BUF, 0, BYTE_SIZE);
    END;
%SBTTL 'EDT$$SPLT_LNINS  - split a line'

GLOBAL ROUTINE EDT$$SPLT_LNINS (		! Split a line
    LENGTH_OPT					! 1 = use length optimizer
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Split a line of text at the current cursor position.
!
! FORMAL PARAMETERS:
!
!	LENGTH_OPT		! 1 = length is greater than zero so insert
!				! after current line
!
!
! IMPLICIT INPUTS:
!
!	LN_LEN
!	LN_BUF
!	LN_END
!	LN_PTR
!	WK_LN
!	EOB_LN
!
! IMPLICIT OUTPUTS:
!
!	LN_LEN
!	LN_BUF
!	LN_END
!	LN_PTR
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	Calls EDT$$SPLT_LN
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$MRK_LNCHG : NOVALUE,		! Track line updates
	EDT$$UPD_LNLEN : NOVALUE,		! Update the length of the current line
	EDT$$INS_LN : NOVALUE,			! Insert a line into buffer
	EDT$$RPL_CHGDLN : NOVALUE,		! Replace a changed workfile line
	EDT$$RD_NXTLN,				! Read next work file record
	EDT$$RD_PRVLN,				! Read previous record
	EDT$$START_INS : NOVALUE,		! Start an insert sequence
	EDT$$END_INS : NOVALUE,			! End an insert sequence
	EDT$$ALO_HEAP,				! Allocate heap storage
	EDT$$DEA_HEAP : NOVALUE;		! Deallocate heap storage

    EXTERNAL
	LN_LEN,				! Length of the current line
	LN_BUF,				! Current line buffer
	LN_END,				! End of current line pointer
	LN_PTR,				! Current character pointer
	WK_LN,				! Current work line
	EOB_LN,				! EOB line
	SEL_BUF : REF TBCB_BLOCK;	! Select buffer, 0 = none

    LOCAL
	LEN,					! New length of old line
	ENDLEN,					! Ending line length
	INSERT_AFTER,				! Insert after current record
	INSERT_DONE;				! 1 = the insert has been done

    INSERT_DONE = 0;
!+
! Don't do the length optinization if we are at [EOB] or if there is an active select.
!-

    IF ((.WK_LN EQLA EOB_LN) OR (.SEL_BUF NEQA 0))
    THEN
	INSERT_AFTER = 0
    ELSE
	INSERT_AFTER = .LENGTH_OPT;

    IF (.INSERT_AFTER NEQ 0)
    THEN
	BEGIN
	LEN = CH$DIFF (.LN_PTR, CH$PTR (LN_BUF, 0, BYTE_SIZE));
	ENDLEN = CH$DIFF (.LN_END, .LN_PTR);
!+
! Use the length optimizer, which says insert below the current line
! if we're positioned anywhere except at the beginning of a line.
!-

	IF (.LEN EQL 0)
	THEN
	    BEGIN
!+
! We are at the beginning of the line.  Just insert a 0-length line before this one.
!-
	    EDT$$START_INS ();			! Perform initialization for text insertion
	    EDT$$INS_LN (CH$PTR (LN_BUF, 0, BYTE_SIZE), 0);
	    EDT$$END_INS ();			! End the insertion sequence
	    LN_PTR = CH$PTR (LN_BUF, 0, BYTE_SIZE);
	    INSERT_DONE = 1;
	    END
	ELSE
	    BEGIN
!+
! Adjust the old line and mark for repaint.
!-

	    LOCAL
		SAV_LN_BUF,			! Place to save the end of the old line
		GOT_HEAP;			! 1 = we got (or don't need) heap storage

!+
! Copy the end of the old line into heap storage, so we can insert it later.
!-

	    IF (.ENDLEN NEQ 0) THEN GOT_HEAP = EDT$$ALO_HEAP (ENDLEN, SAV_LN_BUF) ELSE GOT_HEAP = 1;

	    IF .GOT_HEAP
	    THEN
		BEGIN

		IF (.ENDLEN NEQ 0)
		THEN
		    BEGIN
		    EDT$$CPY_STR (.ENDLEN, .LN_PTR, CH$PTR (.SAV_LN_BUF, 0, BYTE_SIZE));
!+
! Shorten the current line
!-
		    EDT$$UPD_LNLEN (-.ENDLEN);
		    EDT$$MRK_LNCHG (SCR_EDIT_MODIFY, .LEN);
		    END;

		EDT$$RPL_CHGDLN ();
!+
! Insert the tail as the new line.
!-

		IF (.ENDLEN NEQ 0)
		THEN
		    BEGIN
		    EDT$$CPY_STR (.ENDLEN, CH$PTR (.SAV_LN_BUF, 0, BYTE_SIZE),
			 CH$PTR (LN_BUF, 0, BYTE_SIZE));
		    EDT$$DEA_HEAP (ENDLEN, SAV_LN_BUF);
		    END;

		EDT$$RD_NXTLN ();
		EDT$$START_INS ();		! Perform initialization for text insertion
!+
! Adjust the line pointer to the new line.
!-
		EDT$$INS_LN (CH$PTR (LN_BUF, 0, BYTE_SIZE), .ENDLEN);
		LN_LEN = .ENDLEN + .LEN;
		EDT$$UPD_LNLEN (-.LEN);
		EDT$$END_INS ();		! End the insertion sequence
		EDT$$RD_PRVLN ();
		LN_PTR = CH$PTR (LN_BUF, 0, BYTE_SIZE);
		INSERT_DONE = 1;
		END;

	    END;

	END;

!+
! If we haven't done the insert, perhaps because we have run out of heap storage,
! do it the stupid way.
!-

    IF ( NOT .INSERT_DONE)
    THEN
	BEGIN
	EDT$$START_INS ();			! Perform initialization for text insertion
	EDT$$SPLT_LN ();			! Split the line
	EDT$$END_INS ();			! End the insertion sequence
	END;

    END;					! of routine EDT$$SPLT_LNINS

!<BLF/PAGE>
END						! of module EDT$CHMSPLLIN

ELUDOM