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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) 1983, 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:
!
!	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