ADAS Subroutine baprs1

       SUBROUTINE BAPRS1(NDMET,STRING,WNO,CPL,NPT,IPLA,ZPLA,IFAIL)
C
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: BAPRS1 *********************
C
C  PURPOSE:  TO ANALYSE THE TAIL CHARACTER STRING OF A LEVEL DATA LINE
C            OF A SPECIFIC ION FILE INTO WAVE-NUMBER AND SETS OF
C            (PARENT IDENTIFIER, EFFECTIVE ZETA FOR THE PARENT) PAIRS.
C
C  CALLING PROGRAM: ADAS210
C
C  NOTES: DETECT  -  LEVEL WAVE NUMBER WHICH PRECEEDS FIRST '{'
C                 -  SETS OF   PARENT INDEX CONTAINED IN '{.}'
C                              FOLLOWED BY EFFECTIVE ZETA
C         NB. 'X' AS FIRST PARENT ASSIGNMENT MEANS EXCLUDE IONISATION
C             FROM THIS LEVEL.
C             NO PARENT ASSIGNMENT MEANS TAKE LOWEST PARENT WITH
C             ZETA =1.
C             LOWEST PARENT BUT NO ZETA MEANS TAKE ZETA =1.
C             IF THERE IS MORE THAN ONE PARENT THEN ZETA'S MUST BE IN.
C
C
C  SUBROUTINE:
C
C  INPUT : (I*4)  NDMET    =  MAXIMUM NUMBER OF PARENTS
C  INPUT : (C*(*))STRING   =  STRING TO BE PARSED
C
C  OUTPUT: (R*8)  WNO      =  EXCITATION WAVE NUMBER OF LEVEL RELATIVE
C                             TO LOWEST PARENT
C  OUTPUT: (C*1)  CPL      =  LEAD PARENT FOR IONISATION  OR 'X'
C  OUTPUT: (I*4)  NPT      =  NUMBER OF PARENTS DETECTED
C  OUTPUT: (I*4)  IPLA()   =  PARENT INDICES.
C  OUTPUT: (R*8)  ZPLA()   =  EFFECTIVE ZETA FOR PARENT IPLA()
C  OUTPUT: (I*4)  IFAIL    =  0 - SUBROUTINE CONCLUDES CORRECTLY
C                             1 - FAULT DETECTED IN SUBROUTINE
C                             2 - SINGLE IONISATION POTENTIAL DETECTED
C
C          (I*4)  MAXWRD   =  MAXIMUM NUMBER OF WORDS SOUGHT INITIALLY
C                             INITIALLY, FINALLY NUMBER ACTUALLY FOUND
C          (I*4)  NFIRST   =  FIRST WORD TO BE EXTRACTED FROM STRING
C          (I*4)  IFIRST() =  INDEX OF FIRST CHAR. OF WORD () IN STRING
C          (I*4)  ILAST()  =  INDEX OF LAST  CHAR. OF WORD () IN STRING
C          (I*4)  IWORDS   =  NUMBER OF WORDS FOUND IN STRING
C
C          (L*4)  LSET     =  .TRUE.  -  WAVE NUMBER PART SET
C                             .FALSE. -  WAVE NUMBER PART NOT SET
C          (L*4)  LWNO     =  .TRUE.  -  IN THE WAVE NUMBER PART
C                             .FALSE. -  NOT IN THE WAVE NUMBER PART
C          (L*4)  LPRNT    =  .TRUE.  -  IN A PARENT SPECIFIER
C                             .FALSE. -  NOT IN A PARENT SPECIFIER
C          (L*4)  LZETA    =  .TRUE.  -  IN A ZETA SPECIFIER
C                             .FALSE. -  NOT IN A ZETA SPECIFIER
C          (I*4)  IC       =  GENERAL USE
C          (I*4)  IABT     =  FAILURE NUMBER FROM R8FCTN
C          (I*4)  NCHAR    =  NUMBER OF CHARACTERS IN SUBSTRING
C          (C*15) SSTRNG   =  ISOLATED SUBSTRING
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          -------------------------------------------------------------
C          I4UNIT     ADAS      FETCH UNIT NUMBER FOR OUTPUT OF MESSAGES
C          R8FCTN     ADAS      CONVERTS FROM CHARACTER TO REAL VARIABLE
C          I4FCTN     ADAS      CONVERTS FROM CHAR. TO INTEGER  VARIABLE
C          XXWORD     ADAS      PARSES A STRING INTO SEPARATE WORDS
C                               FOR ' ()<>{}' DELIMITERS
C
C AUTHOR:  HP SUMMERS
C          K1/1/57
C          JET EXT. 4941
C
C DATE:    22/06/92
C
C UPDATE:   8/07/93 - HPS  ALTERED TO USE XXWORD PARSING ROUTINE
C
C UPDATE:  21/12/95 - DHB  INCREASED SIZE OF IFIRST & ILAST TO 12 IN 
C                          LINE WITH CHANGE TO NDMET
C
C UNIX-IDL PORT:
C
C VERSION: 1.1                          DATE: 22-1-96
C MODIFIED: TIM HAMMOND (TESSELLA SUPPORT SERVICES PLC)
C               - PUT UNDER SCCS CONTROL
C
C-----------------------------------------------------------------------
      CHARACTER           CPL
      CHARACTER*(*)       STRING
      INTEGER             IFAIL,       IPLA(NDMET), NDMET,       NPT
      REAL*8              WNO,         ZPLA(NDMET)