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 %TITLE 'LTADJ - TABS ADJUST line-mode command'
MODULE LTADJ (				! TABS ADJUST line-mode command
		IDENT = '3-002'			! File: LTADJ.BLI Edit: GB3002
		) =
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 executes the line mode TAB ADJUST command.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: February 3, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 30-JAN-1981.  This module was created by
!	extracting the routine EDT$$TSADJ_CMD  from the module EXEC.BLI.
! 1-002	- Regularize headers.  JBS 20-Mar-1981
! 1-003 - Stop processing on bad select range.  SMB 01-Jul-1982
! 1-004	- Mark the screen changed, unless we get an error.  JBS 07-Jul-1982
! 1-005 - Put EDT$$TST_EOB in line. STS 22-Sep-1982
! 1-006	- Remove EDT$$G_SCR_CHGD, the new screen logic doesn't need it.  JBS 09-Oct-1982
! 1-007 - Put code for edt$$rng_posfrst in line. STS 11-Oct-1982
! 1-008	- Can't restore from saved position because we are modifying the work file,
!	   so the saved position may be invalid.  Also, mark lines as changed in case
!	   we are under EXT.  JBS 21-Dec-1982
! 1-009	- Change the call to EDT$$MRK_LNCHG.  JBS 27-Dec-1982
! 1-010	- Don't forget to initialize NLINES.  JBS 17-Jan-1983
! 3-001 - Fix argument to PUT_CH and introduce BYTE_SIZE for greater than 7 bit bytes.  GB 1-Mar-1983
! 3-002 - Make argument to RPL_LN a string ptr.  GB 16-Mar-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$TSADJ_CMD : NOVALUE;			! Process the TABS ADJUST command

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$TSADJ_CMD  - TABS ADJUST line-mode command'

GLOBAL ROUTINE EDT$$TSADJ_CMD 			! TABS ADJUST line-mode command
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Command processing routine for TABS ADJUST.
!
!	Process each line in the range as follows:
!
!		1. Count the leading tabs and spaces.
!		2. Remove them all.
!		3. Add the tab increment value.
!		4. Re-insert a standard sequence of tabs and spaces.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	TAB_SIZ
!	LN_BUF
!	WK_LN
!	EXE_CURCMD
!	EXT_MOD
!
! IMPLICIT OUTPUTS:
!
!	LN_LEN
!	SCR_CHGD
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$FMT_CHWID,				! Compute the width of a character
	EDT$$PUT_CH : NOVALUE,
	EDT$$NXT_LNRNG,				! Get next line in range
	EDT$$RNG_REPOS,
	EDT$$RPL_LN,				! Replace a line in the work file
	EDT$$RD_PRVLN,				! Read the previous line from the work file
	EDT$$MRK_LNCHG : NOVALUE;		! Mark a line as changed

    EXTERNAL
	TAB_SIZ,
	RNG_FRSTLN,
	RNG_SAVPOS : POS_BLOCK,
	CUR_BUF : REF TBCB_BLOCK,
	RNG_ORIGPOS : POS_BLOCK,
	LN_BUF : VECTOR [CH$ALLOCATION (255, BYTE_SIZE)],
	LN_LEN,
	EOB_LN,
	WK_LN : REF LIN_BLOCK,
	EXE_CURCMD : REF NODE_BLOCK;	! Pointer to the current command.

    LOCAL
	RANGE : REF NODE_BLOCK,			! The range block
	CP,					! Character position
	EP,					! Position of end of line
	TC,					! Column number
	NLINES;					! Number of lines processed

!+
! Examine the range and, if null, default to SELECT.
!-
    RANGE = .EXE_CURCMD [RANGE1];

    IF (.RANGE [RAN_TYPE] EQL RAN_NULL) THEN RANGE [RAN_TYPE] = RAN_SELECT;

!+
! Position to the first line in the range.
!-

     RNG_FRSTLN = 1;
    EDT$$CPY_MEM (POS_SIZE, .CUR_BUF, RNG_ORIGPOS);

    IF ( NOT EDT$$RNG_REPOS (.RANGE)) THEN RETURN;

!+
! Process each line in the range.
!-

    NLINES = 0;

    WHILE (EDT$$NXT_LNRNG (0) AND (.WK_LN NEQA EOB_LN)) DO
	BEGIN
!+
! Initialize pointers to the beginning and end of the current line.
!-
	CP = CH$PTR (WK_LN [LIN_TEXT], 0, BYTE_SIZE);
	EP = CH$PLUS (.CP, .WK_LN [LIN_LENGTH]);
!+
! Initialize the current column number.
!-
	TC = 0;
!+
! Look for the first non-blank, non-tab character.
!-

	WHILE CH$PTR_NEQ (.CP, .EP) DO
	    BEGIN

	    SELECTONE CH$RCHAR (.CP) OF
		SET

		[%C' '] :
		    TC = .TC + 1;

		[ASC_K_TAB] :
		    TC = .TC + EDT$$FMT_CHWID (ASC_K_TAB, .TC);

		[OTHERWISE] :
		    EXITLOOP;
		TES;

	    CP = CH$PLUS (.CP, 1);
	    END;

!+
! Determine the number of columns the line should be indented.  Do
! not let it go below zero.
!-
	TC = MAX (0, .TC + .EXE_CURCMD [TAB_COUNT]*.TAB_SIZ);
	LN_LEN = 0;
!+
! Insert tabs and spaces into the new line.
!-

	INCR I FROM 1 TO .TC/8 DO
	    EDT$$PUT_CH (ASC_K_TAB);

	INCR I FROM 1 TO .TC MOD 8 DO
	    EDT$$PUT_CH (%C' ');

!+
! And move the remainder of the old line.
!-
	CH$MOVE (CH$DIFF (.EP, .CP), .CP, CH$PTR (LN_BUF, .LN_LEN, BYTE_SIZE));
	LN_LEN = .LN_LEN + CH$DIFF (.EP, .CP);
!+
! Replace it in the text buffer.
!-
	EDT$$RPL_LN (CH$PTR (LN_BUF, 0, BYTE_SIZE), .LN_LEN);
	END;

!+
! Re-position to first line in the range.
!-
! We cannot used the saved position because we have modified the work file,
! so any saved position will be inaccurate.
!-
    NLINES = .NLINES - 1;

    WHILE (.NLINES GTR 0) DO
	BEGIN
	EDT$$RD_PRVLN ();
	NLINES = .NLINES - 1;
	END;

    END;					! of routine EDT$$TSADJ_CMD

!<BLF/PAGE>

END						! of module EDT$LTADJ

ELUDOM