findWords.F90

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!! NOTICE
!!  Copyright 2022 UChicago Argonne, LLC and contributors
!!
!!  Licensed under the Apache License, Version 2.0 (the "License");
!!  you may not use this file except in compliance with the License.
!!
!!  Unless required by applicable law or agreed to in writing, software
!!  distributed under the License is distributed on an "AS IS" BASIS,
!!  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
!!  See the License for the specific language governing permissions and
!!  limitations under the License.
!!
      
subroutine findWords (string, first, last, n, nwords)
  
  implicit none
 
#include "constants.h"
  
  character(len=*), intent(inout)   :: string
  integer, intent(in)               :: n 
  integer, intent(inout)            :: nwords, first(n), last(n)
  
  integer, parameter :: ndel = 2, nsym = 1
  !The deliminator characters must be a space and a TAB.
  character    :: delimiters(ndel) = (/' ', TAB_CHAR/)
  character    :: symbols(nsym)    = (/'='/)
  integer              :: i, j, k, strlen
  logical              :: is_delimiter, is_symbol
 
  
  
  
  strlen = len(string)
  nwords = 0
  k      = 1
  
  do i = 1, strlen
     
     is_delimiter = .false.
     do j = 1, ndel
        if (string(i:i) == delimiters(j)) is_delimiter = .true.
     enddo
     is_symbol = .false.
     do j = 1, nsym
        if (string(i:i) == symbols(j)) is_symbol = .true.
     enddo
     
     if (is_delimiter .or. is_symbol) then
        if (i > k) then
           nwords = nwords + 1
           first(nwords) = k
           last(nwords)  = i - 1
        endif
        k = i + 1
     endif
     if (is_symbol) then
        nwords = nwords + 1
        first(nwords) = i
        last(nwords)  = i
     endif
     
  enddo
  
  !               If we ended without a delimiter or symbol, record the last
  !               word.
  
  if (.not. (is_delimiter .or. is_symbol)) then
     nwords = nwords + 1
     first(nwords) = k
     last(nwords)  = strlen
  endif
  
  
  return
end subroutine findWords