Source Code
! Copyright 2019 Khang Hoang Nguyen
!
! Permission is hereby granted, free of charge, to any person obtaining
! a copy of this software and associated documentation files
! (the "Software"), to deal in the Software without restriction,
! including without limitation the rights to use, copy, modify, merge,
! publish, distribute, sublicense, and/or sell copies of the Software,
! and to permit persons to whom the Software is furnished to do so,
! subject to the following conditions
!
! The above copyright notice and this permission notice shall be
! included in all copies or substantial portions of the Software.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
! EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
! MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
! NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
! BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
! ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
! CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.
!| author: Khang Hoang Nguyen
! license: <a href="https://github.com/kevinhng86/faiNumber-Fortran/blob/master/LICENSE">MIT</a>
! since: 1n.0.0.f
!
! <p>This module, <code>fniOctalUtil128</code> contains procedures for
! working with octal strings and int128 data type.
! </p>
!
! @note This module treats octal strings as bit values represented by
! octal digits and not real numbers. Thus, octal strings parse
! by this module will be converted to int128 values as if they
! are real bit values represented by octal digits.
!
! @note Procedures of this module are not pure procedures.
module fniOctalUtil128
use fniConsts
use fniConsts128
implicit none
integer(k_int128), parameter :: dmax128 = 7_k_int128
integer(k_int32) , parameter :: dmax32 = 7_k_int32
private :: dmax32, dmax128
contains
!| author: Khang Hoang Nguyen
! since: 1n.0.0.f
!
! <p>Parse the `input` string as bits represented by octal digits
! to an int128 value.
!
! <p>This function ignores leading and trailing whitespaces.
!
! <p>This function return a logical value of `.TRUE.` if an error
! has occurred during parsing, or `.FALSE.`, otherwise.
!
! <p>This function considers an error to has occurred:<br>
! 1. If the `input` string only contains empty spaces.<br>
! 2. If the `input` string have a length of zero.<br>
! 3. If the value for either the `startpos` or `endpos` arguments
! is incorrect.<br>
! 4. If the `input` string contains a value that is beyond the
! capacity of the int128 data type. <br>
! 5. If the `input` string is not a valid octal string.
! </p>
!
! @see <a href="|url|/page/startpos-endpos-explanation.html">
! startpos & endpos explanation</a>
logical function octalToInt128(input, output, startpos, endpos) result(error)
implicit none
character(len=*) , intent(in) :: input !! A string to be parsed as an octal string to an int128 value.
integer(k_int128), intent(out) :: output !! An int128 value of the <code>input</code> string if no error has occurred during parsing.
integer(k_int32) , intent(in), optional :: startpos !! An int32 value of the position(inclusive) of where to start parsing.
integer(k_int32) , intent(in), optional :: endpos !! An int32 value of the position(inclusive) of where to end parsing.
integer(k_int32) :: c, length, start, runlen
output = 0_k_int128 ; error = .TRUE.
length = len(input) ; start = 1
if ( present(endpos) ) then
if ( endpos < 1 ) return
if ( endpos < length ) length = endpos
end if
do while ( length > 0 )
if ( input(length:length) /= charspace ) exit
length = length - 1
end do
if ( present(startpos) ) then
if ( startpos > 1 ) start = startpos
end if
do while( start <= length )
if ( input(start:start) /= charspace ) exit
start = start + 1
end do
if ( start > length ) return
do while ( start <= length )
if ( input(start:start) /= charzero ) exit
start = start + 1
end do
runlen = (length + 1) - start
if ( runlen == 0 ) then
error = .FALSE.
return
end if
output = IEOR(ICHAR(input(start:start)), czero32)
if ( output > dmax128 ) return
start = start + 1
if ( runlen > 42 ) then
if ( runlen > 43 ) return
if ( output > 3_k_int128 ) return
end if
do while ( start <= length )
c = IEOR(ICHAR(input(start:start)), czero32)
if ( c > dmax32 ) return
output = ISHFT(output, 3) + INT(c, k_int128)
start = start + 1
end do
error = .FALSE.
end function octalToInt128
!| author: Khang Hoang Nguyen
! since: 1n.0.0.f
!
! <p>Parse the `input` string as bits represented by octal digits
! to an int128 value.
!
! <p>This function ignores leading and trailing whitespaces.
!
! <p>This function return an int32 value of 0 on successful parse
! cases or a true error code on unsuccessful parse cases.
!
! <p>Error codes:<br>
! 0 - none <br>
! 1 - empty strings<br>
! 2 - invalid format<br>
! 3 - value too large for data type<br>
! 5 - Invalid argument endpos/startpos<br>
! </p>
!
! @note This function may take longer on unsuccessful parse cases.
!
! @see <a href="|url|/page/startpos-endpos-explanation.html">
! startpos & endpos explanation</a>
integer(k_int32) function octalToInt128TrueError(input, output, startpos, endpos) result(error)
implicit none
character(len=*) , intent(in) :: input !! A string to be parsed as an octal string to an int128 value.
integer(k_int128), intent(out) :: output !! An int128 value of the <code>input</code> string if no error has occurred during parsing.
integer(k_int32) , intent(in), optional :: startpos !! An int32 value of the position(inclusive) of where to start parsing.
integer(k_int32) , intent(in), optional :: endpos !! An int32 value of the position(inclusive) of where to end parsing.
integer(k_int32) :: c, length, start, runlen
output = 0_k_int128 ; error = 0
length = len(input) ; start = 1
if ( present(endpos) ) then
if ( endpos < 1 ) goto 5
if ( present(startpos) ) then
if ( endpos < startpos ) goto 5
end if
if ( endpos < length ) length = endpos
end if
do while ( length > 0 )
if ( input(length:length) /= charspace ) exit
length = length - 1
end do
if ( present(startpos) ) then
if ( startpos > length ) goto 5
if ( startpos > 1 ) start = startpos
end if
do while( start <= length )
if ( input(start:start) /= charspace ) exit
start = start + 1
end do
if ( start > length ) goto 1
do while ( start <= length )
if ( input(start:start) /= charzero ) exit
start = start + 1
end do
runlen = (length + 1) - start
if ( runlen == 0 ) return
output = IEOR(ICHAR(input(start:start)), czero32)
if ( output > dmax32 ) goto 2
start = start + 1
if ( runlen > 42 ) then
if ( runlen > 43 ) goto 10
if ( output > 3_k_int128 ) goto 3
end if
do while ( start <= length )
c = IEOR(ICHAR(input(start:start)), czero32)
if ( c > dmax32 ) goto 2
output = ISHFT(output, 3) + INT(c, k_int128)
start = start + 1
end do
return
1 continue
error = 1
return
2 continue
error = 2
return
3 continue
error = 3
return
5 continue
error = 5
return
10 continue
do while ( start <= length )
c = IEOR(ICHAR(input(start:start)), czero32)
if ( c > dmax32 ) goto 2
start = start + 1
end do
goto 3
end function octalToInt128TrueError
!| author: Khang Hoang Nguyen
! since: 1n.0.0.f
!
! <p>Compare two strings as octal string by parsing them to
! int128 values first.
!
! <p>This function will return a logical value of `.TRUE.` if
! an error has occurred during parsing either one of the `input`
! strings. Otherwise, a logical `.FALSE.` value will be returned.
! </p>
!
! @note Octal strings are being parsed as bits represented by
! octal digits to a signed type.
!
! @see [[octalToInt128]]
logical function octalCompareAsInt128(firstString, secondString, output) result(error)
implicit none
character(len=*), intent(in) :: firstString !! A string to be compared to the string <code>secondString</code>.
character(len=*), intent(in) :: secondString !! A string to be compared to the string <code>firstString</code>.
integer(k_int32), intent(out) :: output !! An int32 value of 1 if the `firstString` is larger than the `secondString`, 0 if they are both equal, or -1 if the `firstString` is smaller than the `secondString`. This value may not be a correct value if an error has occurred during parsing either one of the `input` strings.
integer(k_int128) :: n1, n2
output = 0 ; error = .FALSE.
if ( (octalToInt128(firstString, n1) .eqv. .TRUE.) .OR. &
(octalToInt128(secondString, n2) .eqv. .TRUE.) ) then
error = .TRUE.
return
end if
if ( n1 > n2 ) output = 1
if ( n1 < n2 ) output = -1
end function octalCompareAsInt128
!| author: Khang Hoang Nguyen
! since: 1n.0.0.f
!
! <p>Compare two strings bases on the content of the strings
! reference to int128 values. If the strings are valid octal
! strings that can be parsed to int128 values then they will be
! compared base on their int128 values. Otherwise, the strings will
! be compared base on the priority ranking order below.
!
! <p>This function return an int32 value of 1 if the `firstString`
! is larger than the `secondString`, 0 if they are both equal, or
! -1 if the `firstString` is smaller than the `secondString`.
!
! <p>Priority order ranking: (lo - hi)</br>
! 0 - invalid format<br/>
! 1 - value too large for data type<br/>
! 2 - empty string (0 length or empty space)<br/>
! 3 - valid int128
! </p>
!
! @note Octal strings are being parsed as bits represented by
! octal digits to a signed type.
!
! @see [[octalToInt128TrueError]]
integer(k_int32) function octalInt128OrSmaller(firstString, secondString)
implicit none
character(len=*), intent(in) :: firstString !! A string to be compared to the string <code>secondString</code>.
character(len=*), intent(in) :: secondString !! A string to be compared to the string <code>firstString</code>.
integer(k_int128) :: n1, n2
integer(k_int32) :: e1, e2
octalInt128OrSmaller = 0
e1 = octalToInt128TrueError(firstString, n1)
e2 = octalToInt128TrueError(secondString, n2)
if ( e1 == 1 ) then
if ( e2 == 1 ) return
if ( e2 /= 0 ) then
octalInt128OrSmaller = 1
else
octalInt128OrSmaller = -1
end if
return
else if ( e2 == 1 ) then
if ( e1 /= 0 ) then
octalInt128OrSmaller = -1
else
octalInt128OrSmaller = 1
end if
return
end if
if ( e1 == 0 ) then
if ( e2 == 0 ) then
if ( n1 > n2 ) octalInt128OrSmaller = 1
if ( n1 < n2 ) octalInt128OrSmaller = -1
return
end if
octalInt128OrSmaller = 1
return
else if ( e2 == 0 ) then
octalInt128OrSmaller = -1
return
end if
if ( e1 > e2 ) octalInt128OrSmaller = 1
if ( e1 < e2 ) octalInt128OrSmaller = -1
end function octalInt128OrSmaller
end module fniOctalUtil128