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sources/rannext.bli
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%TITLE 'RANNEXT - next line in a range'
MODULE RANNEXT ( ! Next line in a range
IDENT = '3-002' ! File: RANNEXT.BLI Edit: CJG3002
) =
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:
!
! Get the next line in a range.
!
! ENVIRONMENT: Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: February 3, 1978
!
! MODIFIED BY:
!
! 1-001 - Original. DJS 19-FEB-1981. This module was created by
! extracting routine EDT$$NXT_LNRNG from module RANGE.
! 1-003 - Use the ASSERT macro. JBS 01-Jun-1981
! 1-004 - If this is an ALL range, it must have a search string.
! JBS 31-Oct-1981
! 1-005 - Use the new PREV_RANGE field to find the ALL string. JBS 02-Nov-1981
! 1-006 - Modify the next range find for AND ranges. SMB 15-Feb-1982
! 1-007 - Type .,-,- now works at the [EOB]. TMV 18-FEB-1982
! 1-008 - Regularize format. JBS 04-May-1982
! 1-009 - Remove EDT$$A_STR_CMP. JBS 16-Jul-1982
! 1-010 - Put calls to edt$$rng_nxtln in line. STS 17-Sep-1982
! 1-011 - Put edt$$tst_eob in line. STS 22-Sep-1982
! 1-012 - Remove reference to edt$$rng_posfrst. STS 11-Oct-1982
! 3-001 - Add updates from V3 sources. GB 03-May-1983
! 3-002 - Modify ASSERT macro to include error code. CJG 30-Jan-1984
!--
%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!
REQUIRE 'EDTSRC:TRAROUNAM';
FORWARD ROUTINE
EDT$$NXT_LNRNG;
!
! INCLUDE FILES:
!
REQUIRE 'EDTSRC:EDTREQ';
!
! MACROS:
!
! NONE
!
! EQUATED SYMBOLS:
!
! NONE
!
! OWN STORAGE:
!
! NONE
!
! EXTERNAL REFERENCES:
!
! In the routine
%SBTTL 'EDT$$NXT_LNRNG - next line in a range'
GLOBAL ROUTINE EDT$$NXT_LNRNG ( ! Get the next line in a range
DELETED ! 1 = last line was deleted
) =
!++
! FUNCTIONAL DESCRIPTION:
!
! This routine returns the next line in a range. The position
! routine must have been called first if this routine is to
! work properly.
!
! FORMAL PARAMETERS:
!
! DELETED Indicate whether the last line was deleted.
!
! IMPLICIT INPUTS:
!
! RNG_CURRNG
! RNG_EOL
! RNG_MORELN
! RNG_NOOFLN
! SEA_STRLEN
! WK_LN
! EXCT_MATCH
!
! IMPLICIT OUTPUTS:
!
! RNG_FRSTLN
!
! ROUTINE VALUE:
!
! 0 = No more lines exist in this range
! 1 = A line was sucessfully located
!
!
! SIDE EFFECTS:
!
! The current text buffer is re-positioned.
!
!--
BEGIN
EXTERNAL ROUTINE
EDT$$RNG_REPOS,
EDT$$CMP_LNO,
EDT$$RD_NXTLN,
EDT$$STR_CMP; ! Compare two strings of equal length
EXTERNAL
RNG_CURRNG : REF NODE_BLOCK, ! The current range node
RNG_EOL : LN_BLOCK, ! The line number at which this range ends
RNG_MORELN, ! Used by EDT$$NXT_LNRNG to indicate more lines.
RNG_FRSTLN, ! Indicates first line in a range.
RNG_NOOFLN, ! Count of number of lines in a range.
SEA_STRLEN, ! Length of search string.
EOB_LN,
EXCT_MATCH, ! The type of string matching
WK_LN : REF LIN_BLOCK; ! The current line pointer.
LABEL
LOOP;
LOCAL
DEL_FLAG;
!+
! Get a local copy of the delete flag, since if this is an ALL range,
! we will loop, and the delete flag will be turned off after the first
! time though.
!-
DEL_FLAG = .DELETED;
!+
! Loop until we find a line which contains the ALL string. If no all
! string, we will get out the first time through.
!-
LOOP :
BEGIN
WHILE 1 DO
BEGIN
!+
! If we are at the end of the buffer, or the RNG_MORELN flag is zero,
! then there are no more lines. Exit with a 0.
!-
IF .RNG_MORELN EQL 0 THEN RETURN (0);
!+
! Case on the range type.
!-
CASE .RNG_CURRNG [RAN_TYPE] FROM RAN_NULL TO NUM_RAN OF
SET
!+
! For all the single line ranges, if RNG_FRSTLN is on, then return
! success and turn it off. If it is not then check to see if it
! was part of an AND list; if so, position to the next line in
! the list.
!-
[RAN_NUMBER, RAN_DOT, RAN_STR, RAN_BEGIN, RAN_LAST, RAN_END, RAN_MINUS, RAN_PLUS, RAN_NULL,
RAN_MINSTR, RAN_ORIG] :
BEGIN
IF .RNG_FRSTLN !
THEN
RNG_FRSTLN = 0
ELSE
IF (.RNG_CURRNG [NEXT_RANGE] EQL 0)
THEN
RETURN (0)
ELSE
IF EDT$$RNG_REPOS (.RNG_CURRNG [NEXT_RANGE])
THEN
RNG_FRSTLN = 0
ELSE
RETURN (0);
END;
!+
! For WHOLE or REST, just move to the next line.
!-
[RAN_WHOLE, RAN_REST] :
BEGIN
IF (.WK_LN EQLA EOB_LN) THEN RETURN (0);
IF NOT .DEL_FLAG
THEN
IF (NOT .RNG_FRSTLN)
THEN
EDT$$RD_NXTLN()
ELSE
RNG_FRSTLN = 0;
END;
!+
! For FOR and SELECT, the range block contains the number of lines
! to include. Count it down, returning failure if it becomes negative.
!-
[RAN_FOR, RAN_SELECT] :
BEGIN
IF (.WK_LN EQLA EOB_LN) THEN RETURN (0);
RNG_CURRNG [RAN_VAL] = .RNG_CURRNG [RAN_VAL] - 1;
IF (.RNG_CURRNG [RAN_VAL] LSS 0)
THEN
RETURN (0)
ELSE
IF NOT .DEL_FLAG
THEN
IF NOT .RNG_FRSTLN
THEN
EDT$$RD_NXTLN()
ELSE
RNG_FRSTLN = 0;
END;
!+
! The THRU and BEFORE ranges have saved away the last line to be
! included. Move to the next line in the range, then compare it
! to the last line number. If it is greater, return failure.
!-
[RAN_THRU, RAN_BEFORE] :
BEGIN
IF (.WK_LN EQLA EOB_LN) THEN RETURN (0);
IF NOT .DEL_FLAG
THEN
IF NOT .RNG_FRSTLN
THEN
EDT$$RD_NXTLN()
ELSE
RNG_FRSTLN = 0;
IF (EDT$$CMP_LNO (WK_LN [LIN_NUM], RNG_EOL) GTR 0) THEN RETURN (0);
END;
[INRANGE] :
; ! some ranges (such as ALL) can never get here.
[OUTRANGE] :
ASSERT (19, 0);
TES;
!+
! If there was an ALL, insure that the string exists in the line.
! If it does not, continue through the loop again looking either
! for one that does contain the string or the end of the range.
!-
BEGIN
BIND
ALL_RAN = .RNG_CURRNG [PREV_RANGE] : NODE_BLOCK;
LOCAL
CH_POINT;
IF (ALL_RAN EQLA 0) THEN LEAVE LOOP;
IF ((ALL_RAN NEQA 0) AND (.WK_LN EQLA EOB_LN)) THEN RETURN (0);
IF (.ALL_RAN [RAN_TYPE] NEQ RAN_ALL) THEN LEAVE LOOP;
!+
! An ALL range must have a string.
!-
ASSERT (19, .ALL_RAN [STR_PNT] NEQA 0);
CH_POINT = CH$PTR (WK_LN [LIN_TEXT],, BYTE_SIZE);
DECR I FROM .WK_LN [LIN_LENGTH] - .SEA_STRLEN TO 0 DO
IF EDT$$STR_CMP (.CH_POINT, .ALL_RAN [STR_PNT], .ALL_RAN [RAN_VAL], .EXCT_MATCH)
THEN
LEAVE LOOP ! This line has the string
ELSE
CH_POINT = CH$PLUS (.CH_POINT, 1); ! Keep looking
DEL_FLAG = 0;
END;
END;
END;
!+
! Count one more line found in the range.
!-
RNG_NOOFLN = .RNG_NOOFLN + 1;
RETURN (1);
END; ! of routine EDT$$NXT_LNRNG
END
ELUDOM