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 %TITLE 'PRLINNUM - parse a line number'
MODULE PRLINNUM (				! Parse a command
		IDENT = '3-003'			! File: PRLINNUM.BLI Edit:GB3003
		) =
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:
!
!	Parse a line number and a number.
!
! ENVIRONMENT:	Runs on TOPS-20 only
!
! AUTHOR: Chris Gill, CREATION DATE: March 15, 1983
!
! MODIFIED BY:
! 3-002 - Check for control-C being typed. CJG 5-Jan-1984
! 3-003 - Handle line numbers with fractional part of 0. GB 19-Jun-1984

!--
%SBTTL 'DECLARATIONS'
!
! TABLE OF CONTENTS
!

REQUIRE 'EDTSRC:TRAROUNAM';

REQUIRE 'EDTSRC:PARLITS';

FORWARD ROUTINE
    EDT$$PA_LINE_NUM,				! Parse a line number
    EDT$$PA_NUMBER;				! Parse a number

!
! INCLUDE FILES
!

REQUIRE 'EDTSRC:EDTREQ';

REQUIRE 'SYS:JSYS';

!
! EXTERNAL REFERENCES
!
!	In the routines
!
!
! MACROS:
!
!	NONE
!
!
! OWN STORAGE
!
!	NONE
!


%SBTTL 'EDT$$PA_NUMBER - Parse a decimal number'

GLOBAL ROUTINE EDT$$PA_NUMBER =				! Parse a number


BEGIN

!+
! FUNCTIONAL DESCRIPTION
!
! This subroutine parses a number and returns its value.
!
! ROUTINE VALUE
!
!	+N - Value of number
!	-1 - Reparse required
!	-2 - JSYS error or number not found
!-

    EXTERNAL
	CSB,
	FD_VAL,
	CC,					! Control-C flag
	PA_NUMVAL : LN_BLOCK;

    LOCAL
	VAL : LN_BLOCK,				! Temp for line numbers
	C_FLAG,					! COMND flags
	C_DATA,					! COMND data or pointer
	C_FDB;					! FDB used in parse


    BEGIN
	IF (NOT COMMAND (FD_VAL)) THEN RETURN (-2);
	IF (.CC NEQ 0) THEN RETURN (-2);
	IF ((.C_FLAG AND CM_RPT) NEQ 0) THEN RETURN (-1);
	IF ((.C_FLAG AND CM_NOP) NEQ 0) THEN RETURN (-2);
	BUILDLINE (.C_DATA, VAL);
	MOVELINE (VAL, PA_NUMVAL);
	RETURN (.C_DATA);
    END;
END;

%SBTTL 'EDT$$PA_LINE_NUM - Build a line number'

GLOBAL ROUTINE EDT$$PA_LINE_NUM (
		OLD ) =				! Build a line number


BEGIN

!+
! FUNCTIONAL DESCRIPTION
!
! This routine builds a line number which is in the form nnn[.mmm].
! Spaces are not allowed in the number. PA_NUMVAL is set up with
! the line number.
!
! ROUTINE VALUE
!
!	-1 - JSYS error or number not found
!	 0 - Reparse required
!	+1 - All OK
!-

    EXTERNAL
	CSB,
	FD_DOT,
	PA_ERRNO,				! Error number
	PA_NUMVAL : LN_BLOCK,			! Numeric value
	CC,					! Control-C flag
	LNO0 : LNOVECTOR [14];

    LOCAL
	STS,
	VAL : LN_BLOCK,				! Temp for line numbers
	C_FLAG,					! COMND flags
	C_DATA,					! COMND data or pointer
	C_FDB;					! FDB used in parse

    MESSAGES ((NUMVALILL));


    BEGIN

!+
! If a value has already been parsed, then use it, else get a new one.
!-

	IF (.OLD LSS 0) THEN
	    BEGIN
	    STS = EDT$$PA_NUMBER ();
	    IF (.STS LSS 0) THEN RETURN (.STS+1);
	    END
	ELSE
	    BEGIN
	    BUILDLINE (.OLD, PA_NUMVAL);
	    END;
	MULTLINE (LNO0 [5], PA_NUMVAL, PA_NUMVAL);

!+
! If the next character is a dot, then keep going, else done now.
!-

	IF (NOT COMMAND (FD_DOT)) THEN RETURN (-1);
	IF (.CC NEQ 0) THEN RETURN (-1);
	IF ((.C_FLAG AND CM_NOP) NEQ 0) THEN RETURN (1);
	IF ((.C_FLAG AND CM_RPT) NEQ 0) THEN RETURN (0);
	MOVELINE (PA_NUMVAL, VAL);

!+
! Parse the next part of the line number (the fraction)
!-

	STS = EDT$$PA_NUMBER ();
	IF (.STS LSS 0) THEN RETURN (.STS+1);
	IF (.STS GEQ 100000) THEN
	    BEGIN
	    PA_ERRNO = EDT$_NUMVALILL;
	    RETURN (-1);
	    END;

!+
! Shift the fraction to the right place and add the integer part
!-

	IF (.PA_NUMVAL NEQ 0) THEN
	    UNTIL (.PA_NUMVAL GEQ 10000) DO
		(PA_NUMVAL = .PA_NUMVAL * 10);
	ADDLINE (VAL, PA_NUMVAL, PA_NUMVAL);
	RETURN (1);
    END;
END;

END
ELUDOM