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6-1-sources/chmmrkchg.bli
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%TITLE 'CHMMRKCHG - track changes in current line'
MODULE CHMMRKCHG ( ! Track changes in current line
IDENT = '3-001' ! File: CHMMRKCHG.BLI Edit: CJG3001
) =
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 keeps track of the bounds between which the
! current line must be updated.
!
! ENVIRONMENT: Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: Unknown
!
! MODIFIED BY:
!
! 2-001 - Recode to interface to the new screen updater. JBS 13-Sep-1982
! 2-002 - Version 2-001 was just a stub. This version is little better:
! it always marks the line for reapinting. JBS 17-Sep-1982
! 2-003 - Add logic for deleting lines and for skipping over deleted lines.
! JBS 20-Sep-1982
! 2-004 - Worry about the target line having a deleted neighbor. JBS 20-Sep-1982
! 2-005 - Call EDT$$SC_FNDREC, which contains the table searching code. JBS 24-Sep-1982
! 2-006 - Record the actual edits to a line, instead of just marking it for repaint. JBS 28-Sep-1982
! 2-007 - Change the parameters to SC_FNDREC. SMB 28-Sep-1982
! 2-008 - Put in temporary zeroing of screen buffer pointer. SMB 30-Sep-1982
! 2-009 - Remove yesterday's temporary change. SMB 01-Oct-1982
! 2-010 - Change the way SC_FNDREC is used. SMB 08-Oct-1982
! 2-011 - Don't run off the end of the edit buffer, and maintain SCR_EDIT_POS. JBS 18-Oct-1982
! 2-012 - Turn insert followed by delete into a null operation. JBS 24-Oct-1982
! 2-013 - Fix problems involving marking deleted characters. JBS 24-Oct-1982
! 2-014 - If we free the first screen pointer, update EDT$$A_FST_SCRPTR.
! 2-015 - Maintain SCR_EDIT_MINPOS. JBS 28-Oct-1982
! 2-016 - Use EDT$$SC_LNDEL to free line blocks. JBS 29-Oct-1982
! 2-017 - Fix a bad LOCAL declaration. SMB 31-Oct-1982
! 2-018 - Maintain MINPOS, even if we must repaint, to avoid extra repainting
! if we overflow the edit buffer, which is likely on the PDP-11. JBS 01-Dec-1982
! 2-019 - Maintain MINPOS even if the previous edit is a repaint. JBS 04-Dec-1982
! 2-020 - If we are editing the first character of a continuation line, mark the
! previous line as needing repainting at its end, in case we are inserting
! a character before a wide character that should really be painted at the
! end of the previous line. JBS 20-Dec-1982
! 2-021 - Remove the edit buffer. JBS 27-Dec-1982
! 2-022 - If we delete an inserted continuation or continued line,
! rebuild the screen data structure. JBS 05-Jan-1983
! 2-023 - If we are going to rebuild the screen data structure,
! don't update anything. JBS 17-Feb-1983
! 3-001 - Modify ASSERT macro to include error code. CJG 30-Jan-1984
!--
%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!
REQUIRE 'EDTSRC:TRAROUNAM';
FORWARD ROUTINE
EDT$$MRK_LNCHG : NOVALUE; ! Mark changes in the current line
!
! INCLUDE FILES:
!
REQUIRE 'EDTSRC:EDTREQ';
!
! MACROS:
!
! NONE
!
! EQUATED SYMBOLS:
!
! NONE
!
! OWN STORAGE:
!
! NONE
!
! EXTERNAL REFERENCES:
!
! In the routine
%SBTTL 'EDT$$MRK_LNCHG - mark changes in the current line'
GLOBAL ROUTINE EDT$$MRK_LNCHG ( ! Mark changes in the current line
CODE, ! Change code
POSITION ! Position in the record
) : NOVALUE =
!++
! FUNCTIONAL DESCRIPTION:
!
! Keep track of edits done to lines on the screen, so the screen
! updater can repaint them.
!
! FORMAL PARAMETERS:
!
! CODE The type of edit: delete line or modify
! POSITION The position in the record at which the operation takes place
!
! IMPLICIT INPUTS:
!
! SCR_BUF
! CUR_BUF
! SCR_REBUILD
!
! IMPLICIT OUTPUTS:
!
! LN_CHGD
! SCR_REBUILD
!
! ROUTINE VALUE:
!
! NONE
!
! SIDE EFFECTS:
!
! NONE
!
!--
BEGIN
EXTERNAL ROUTINE
EDT$$SC_FNDREC, ! Find a record in the screen data base
EDT$$SC_LNDEL : NOVALUE; ! Free a record from the screen data base
EXTERNAL
SCR_BUF,
CUR_BUF : REF TBCB_BLOCK, ! Pointer to the current text buffer control block
LN_CHGD, ! The current record has been changed
SCR_REBUILD; ! 1 = the screen data base has to be rebuilt
LOCAL
DISP, ! Displacement from cursor screen pointer
SCRPTR : REF SCREEN_LINE, ! Pointer to our screen line
RECORD_NO : LN_BLOCK, ! Record number of our screen line
EDIT_CODE, ! Do this to this record
REL_POS, ! Position in this line
MIN_RELPOS; ! Minimum edit position on this line
!+
! Make sure the work file system knows that the current record has been
! changed, so it will write the record back to the work file system.
!-
LN_CHGD = 1;
!+
! If we are going to rebuild the screen data base anyway, don't bother to update it.
!-
IF .SCR_REBUILD THEN RETURN;
!+
! Point to the current line in the screen data base.
!-
ASSERT (7, .POSITION LEQ 255);
SCRPTR = EDT$$SC_FNDREC (.POSITION, DISP);
!+
! If the line is not in the screen data base, just return.
!-
IF (.SCRPTR EQLA 0) THEN RETURN;
!+
! Check for delete of an inserted line. It is very special.
!-
EDIT_CODE = .CODE;
IF ((.EDIT_CODE EQL SCR_EDIT_DELLN) AND ((.SCRPTR [SCR_EDIT_FLAGS] AND SCR_EDIT_INSLN) NEQ 0))
THEN
BEGIN
!+
! We are deleting an inserted line. Back out the insert so that
! the screen updater will see nothing.
!-
LOCAL
NEXT_SCRPTR : REF SCREEN_LINE;
!+
! If this is a continued or continuation line, rebuild the screen data base.
!-
IF (.SCRPTR [SCR_LINE_IDX] NEQ 0)
THEN
BEGIN
SCR_REBUILD = 1;
RETURN;
END;
NEXT_SCRPTR = .SCRPTR [SCR_NXT_LINE];
IF (.NEXT_SCRPTR NEQA 0)
THEN
BEGIN
IF (.NEXT_SCRPTR [SCR_LINE_IDX] NEQ 0)
THEN
BEGIN
SCR_REBUILD = 1;
RETURN;
END;
END;
EDT$$SC_LNDEL (.SCRPTR);
RETURN;
END;
!+
! Maintain the record of the minimum edit position.
!-
REL_POS = .POSITION - .SCRPTR [SCR_CHR_FROM];
MIN_RELPOS = MINU (.REL_POS, .SCRPTR [SCR_EDIT_MINPOS]);
SCRPTR [SCR_EDIT_MINPOS] = .MIN_RELPOS;
SCRPTR [SCR_EDIT_MAXPOS] = 255;
!+
! If we are editing at the front of a continuation line, mark the previous line as needing
! an edit at its end. This is in case we are inserting a narrow character in front of a
! wide character; the narrow character may want to be displayed at the end of the previous line.
!-
IF ((.REL_POS EQL 0) AND (.SCRPTR [SCR_CHR_FROM] NEQ 0)) !
THEN
EDT$$MRK_LNCHG (SCR_EDIT_MODIFY, .POSITION - 1);
!+
! Mark the edit for this line.
!-
SCRPTR [SCR_EDIT_FLAGS] = .SCRPTR [SCR_EDIT_FLAGS] OR .EDIT_CODE;
!+
! After any edit to a line, mark all subsequent lines for the
! same record for repainting. This means that in NOTRUNCATE mode,
! if you edit a line all later lines for that record are repainted.
! This is important even for replaces, since the width of a character
! may change. Note that deleting a line causes the subsequent
! records to be marked as deleted.
!-
WHILE ((.SCRPTR [SCR_CHR_TO] NEQ 255) AND (.SCRPTR [SCR_NXT_LINE] NEQA 0)) DO
BEGIN
SCRPTR = .SCRPTR [SCR_NXT_LINE];
SCRPTR [SCR_EDIT_MINPOS] = 0;
SCRPTR [SCR_EDIT_MAXPOS] = 255;
SCRPTR [SCR_EDIT_FLAGS] = .SCRPTR [SCR_EDIT_FLAGS] OR .EDIT_CODE;
END; ! Repaint later lines for this record
END; ! of routine EDT$$MRK_LNCNG
!<BLF/PAGE>
END ! of module EDT$CHMMRKCHG
ELUDOM