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test3.f90
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test3.f90
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! Test the Fortran PCRE wrapper
!
! Examples taken from
! https://github.com/niklongstone/regular-expression-cheat-sheet
program test_pcre
use, intrinsic :: iso_c_binding
use pcre_module
implicit none
type token_type
character(len=:), allocatable :: token
end type token_type
integer :: number_failed = 0
! Start of string or line
number_failed = number_failed + test_valid_pattern("^foam", "foam", "foam")
number_failed = number_failed + test_invalid_pattern("^foam", "bath foam")
! Start of string, any match mode
number_failed = number_failed + test_valid_pattern("\Afoam", "foam", "foam")
number_failed = number_failed + test_invalid_pattern("\Afoam", "bath foam")
! End of string or line
number_failed = number_failed + test_valid_pattern("finish$", "finish", "finish")
number_failed = number_failed + test_invalid_pattern("finish$", "finnish")
! End of string, any match mode
number_failed = number_failed + test_valid_pattern("finish\Z", "finish", "finish")
number_failed = number_failed + test_invalid_pattern("finish\Z", "finnish")
! Word boundary
number_failed = number_failed + test_valid_pattern("\bis\b", "This island is beautiful", "is")
number_failed = number_failed + test_invalid_pattern("\bis\b", "This island isn't beautiful")
! Not word boundary
number_failed = number_failed + test_valid_pattern("\Bland", "island", "land")
number_failed = number_failed + test_invalid_pattern("\Bland", "peninsula")
! Positive lookahead
number_failed = number_failed + test_valid_pattern("question(?=s)", "questions", "question")
number_failed = number_failed + test_invalid_pattern("question(?=s)", "question")
! Negative lookahead
number_failed = number_failed + test_valid_pattern("answer(?!s)", "answer", "answer")
number_failed = number_failed + test_invalid_pattern("answer(?!s)", "answers")
! Positive look-behind
number_failed = number_failed + test_valid_pattern("(?<=appl)e", "apple", "e")
number_failed = number_failed + test_invalid_pattern("(?<=appl)e", "orange")
! Negative look-behind
number_failed = number_failed + test_valid_pattern("(?<!goo)d", "mood", "d")
number_failed = number_failed + test_invalid_pattern("(?<!goo)d", "good")
! Character class definition
number_failed = number_failed + test_valid_pattern("[axf]", "a, x, f", "a x f")
number_failed = number_failed + test_invalid_pattern("[axf]", "b")
! Character class range
number_failed = number_failed + test_valid_pattern("[a-c]", "a, b, c", "a b c")
number_failed = number_failed + test_invalid_pattern("[a-c]", "d")
! Escape in character class
number_failed = number_failed + test_valid_pattern("[a-f\.]", "a, b, .", "a b .")
number_failed = number_failed + test_invalid_pattern("[a-f\.]", "g")
! Not in class
number_failed = number_failed + test_valid_pattern("[^abc]", "de", "d e")
number_failed = number_failed + test_invalid_pattern("[^abc]", "a")
! Any character except newline
number_failed = number_failed + test_valid_pattern("b.ttle", "battle, bottle", "battle bottle")
number_failed = number_failed + test_invalid_pattern("b.ttle", "bttle")
! Whitespace
number_failed = number_failed + test_valid_pattern("good\smorning", "good morning", "good morning")
number_failed = number_failed + test_invalid_pattern("good\smorning", "good.morning")
! Not whitespace
number_failed = number_failed + test_valid_pattern("good\Smorning", "good.morning", "good.morning")
number_failed = number_failed + test_invalid_pattern("good\Smorning", "good morning")
! Digit
number_failed = number_failed + test_valid_pattern("\d+", "0101", "0101")
number_failed = number_failed + test_invalid_pattern("\d+", "string")
! Not a digit
number_failed = number_failed + test_valid_pattern("\D+", "string", "string")
number_failed = number_failed + test_invalid_pattern("\D+", "0101")
! Word character
number_failed = number_failed + test_valid_pattern("\w+", "string01", "string01")
number_failed = number_failed + test_invalid_pattern("\w+", ".$?%")
! Not a word character
number_failed = number_failed + test_valid_pattern("\W+", ".$?%", ".$?%")
number_failed = number_failed + test_invalid_pattern("\W+", "string01")
! Alternation
number_failed = number_failed + test_valid_pattern("apple|orange", "orange, apple", "orange apple")
number_failed = number_failed + test_invalid_pattern("apple|orange", "melon")
! Subpattern
number_failed = number_failed + test_valid_pattern("foot(er|ball)", "footer, football", "footer er football ball")
number_failed = number_failed + test_invalid_pattern("foot(er|ball)", "footpath")
! Non-capturing subpattern
number_failed = number_failed + test_valid_pattern("foot(?:er|ball)", "footer, football", "footer football")
number_failed = number_failed + test_invalid_pattern("foot(?:er|ball)", "footpath")
! One or more
number_failed = number_failed + test_valid_pattern("ye+ah", "yeah, yeeeeeah", "yeah yeeeeeah")
number_failed = number_failed + test_invalid_pattern("ye+ah", "yah")
! Zero or more
number_failed = number_failed + test_valid_pattern("ye*ah", "yeah, yeeeeeah, yah", "yeah yeeeeeah yah")
number_failed = number_failed + test_invalid_pattern("ye*ah", "yeh")
! Zero or one
number_failed = number_failed + test_valid_pattern("yes?", "yes, ye", "yes ye")
number_failed = number_failed + test_invalid_pattern("yes?$", "yesss")
! n times exactly
number_failed = number_failed + test_valid_pattern("fo{2}", "foo", "foo")
number_failed = number_failed + test_invalid_pattern("fo{2}", "fo")
! Between n and m times
number_failed = number_failed + test_valid_pattern("go{2,3}d", "good, goood", "good goood")
number_failed = number_failed + test_invalid_pattern("go{2,3}d", "gooood")
! At least n times
number_failed = number_failed + test_valid_pattern("go{2,}", "goo, gooo", "goo gooo")
number_failed = number_failed + test_invalid_pattern("go{2,}", "go")
print*, new_line('A') // new_line('A')
if (number_failed > 0) then
print*, "Some tests failed:", number_failed
else
print*, "All tests passed!"
end if
contains
integer function test_valid_pattern(pattern, valid_match, expected)
character(len=*), intent(in) :: pattern
character(len=*), intent(in) :: valid_match
character(len=*), intent(in) :: expected
logical :: status
type(token_type), dimension(:), allocatable :: tokens
character(len=:), allocatable :: string
print('(A,A,A,A,A)'), "Searching '", valid_match, "' for '", pattern, "'"
print('(A,A)'), "Should match: ", expected
tokens = tokeniser(pattern, valid_match)
if (size(tokens) > 0) then
string = print_tokens(tokens)
if (string == expected) then
test_valid_pattern = 0
else
test_valid_pattern = 1
print*, " *** FAILED ***"
end if
else
test_valid_pattern = 1
print*, " *** FAILED ***"
end if
print('(A)'), "--------------------"
end function test_valid_pattern
integer function test_invalid_pattern(pattern, invalid_match)
character(len=*), intent(in) :: pattern
character(len=*), intent(in) :: invalid_match
logical :: status
type(token_type), dimension(:), allocatable :: tokens
character(len=:), allocatable :: string
print('(A,A,A,A,A)'), "Searching '", invalid_match, "' for '", pattern, "'"
print('(A)'), "Should not match"
tokens = tokeniser(pattern, invalid_match)
if (size(tokens) > 0) then
string = print_tokens(tokens)
test_invalid_pattern = 1
print*, " *** FAILED ***"
else
test_invalid_pattern = 0
end if
print('(A)'), "--------------------"
end function test_invalid_pattern
function print_tokens(tokens) result(string)
type(token_type), dimension(:), intent(in) :: tokens
character(len=:), allocatable :: string
integer :: i
string = ""
do i=1, size(tokens)
write(*,'(A," ")', advance='no') tokens(i)%token
string = string // tokens(i)%token // " "
end do
print*, ""
string = trim(string)
end function print_tokens
!> Finds all instances of pattern in
!> subject, but only the first group from each instance
function tokeniser(pattern, subject) result(tokens)
use, intrinsic :: iso_c_binding
use pcre_module
implicit none
character(len=*), intent(in) :: pattern, subject
type(token_type), dimension(:), allocatable :: tokens
type(pcre_type) :: regex
integer, parameter :: ovecsize = 30
integer, dimension(0:ovecsize-1) :: ovector
integer :: error
integer :: total_matches
regex = pcre_compile(pattern, 0)
if (.not. c_associated(regex%regex)) then
print*,"PCRE compilation failed"
allocate(tokens(0))
return
end if
error = pcre_exec(regex, c_null_ptr, subject, 0, 0, ovector)
if (error < 0) then
select case(error)
case (PCRE_ERROR_NOMATCH)
print*,"No match"
case default
print*,"Matching error ", error
end select
allocate(tokens(0))
return
end if
if (error == 0) then
error = ovecsize / 3
print('(A,I0,A)'),"ovector only has room for ", error - 1, " captured substrings"
end if
total_matches = error
allocate(tokens(total_matches))
block
integer :: substring_start
integer :: substring_end
integer :: i
do i = 0, error - 1
substring_start = ovector(2*i) + 1
substring_end = ovector(2*i + 1)
tokens(i+1) = token_type(subject(substring_start:substring_end))
end do
end block
block
integer :: options
integer :: start_offset
do
options = 0
start_offset = ovector(1)
if (ovector(0) == ovector(1)) then
if (ovector(0) == len(subject)) exit
end if
error = pcre_exec(regex, c_null_ptr, subject, start_offset, options, ovector)
if (error == PCRE_ERROR_NOMATCH) then
if (options == 0) exit
ovector(1) = start_offset + 1
continue
end if
if (error < 0) then
print('(A,I0)'), "Matching error ", error
allocate(tokens(0))
return
end if
block
integer :: i
integer :: substring_start
integer :: substring_end
type(token_type) :: found_token
do i = 0, error-1
total_matches = total_matches + 1
substring_start = ovector(2*i) + 1
substring_end = ovector((2*i)+1)
found_token = token_type(subject(substring_start:substring_end))
tokens = [tokens, found_token]
end do
end block
end do
end block
end function tokeniser
end program test_pcre