| 1 | module bracket_matching_module |
| 2 | use text_buffer_module |
| 3 | implicit none |
| 4 | private |
| 5 | |
| 6 | public :: find_matching_bracket, is_opening_bracket, is_closing_bracket |
| 7 | public :: get_bracket_pair |
| 8 | |
| 9 | contains |
| 10 | |
| 11 | logical function is_opening_bracket(ch) |
| 12 | character(len=1), intent(in) :: ch |
| 13 | is_opening_bracket = (ch == '(' .or. ch == '[' .or. ch == '{') |
| 14 | end function is_opening_bracket |
| 15 | |
| 16 | logical function is_closing_bracket(ch) |
| 17 | character(len=1), intent(in) :: ch |
| 18 | is_closing_bracket = (ch == ')' .or. ch == ']' .or. ch == '}') |
| 19 | end function is_closing_bracket |
| 20 | |
| 21 | character(len=1) function get_bracket_pair(ch) |
| 22 | character(len=1), intent(in) :: ch |
| 23 | |
| 24 | select case(ch) |
| 25 | case('(') |
| 26 | get_bracket_pair = ')' |
| 27 | case(')') |
| 28 | get_bracket_pair = '(' |
| 29 | case('[') |
| 30 | get_bracket_pair = ']' |
| 31 | case(']') |
| 32 | get_bracket_pair = '[' |
| 33 | case('{') |
| 34 | get_bracket_pair = '}' |
| 35 | case('}') |
| 36 | get_bracket_pair = '{' |
| 37 | case default |
| 38 | get_bracket_pair = '' |
| 39 | end select |
| 40 | end function get_bracket_pair |
| 41 | |
| 42 | subroutine find_matching_bracket(buffer, start_line, start_col, & |
| 43 | found, match_line, match_col) |
| 44 | type(buffer_t), intent(in) :: buffer |
| 45 | integer, intent(in) :: start_line, start_col |
| 46 | logical, intent(out) :: found |
| 47 | integer, intent(out) :: match_line, match_col |
| 48 | character(len=:), allocatable :: line |
| 49 | character(len=1) :: start_char, target_char |
| 50 | integer :: depth, current_line, current_col |
| 51 | integer :: line_count, line_len |
| 52 | logical :: search_forward |
| 53 | |
| 54 | found = .false. |
| 55 | match_line = 0 |
| 56 | match_col = 0 |
| 57 | |
| 58 | ! Get the character at the starting position |
| 59 | line = buffer_get_line(buffer, start_line) |
| 60 | if (start_col < 1 .or. start_col > len(line)) then |
| 61 | if (allocated(line)) deallocate(line) |
| 62 | return |
| 63 | end if |
| 64 | |
| 65 | start_char = line(start_col:start_col) |
| 66 | if (allocated(line)) deallocate(line) |
| 67 | |
| 68 | ! Check if it's a bracket |
| 69 | if (.not. is_opening_bracket(start_char) .and. & |
| 70 | .not. is_closing_bracket(start_char)) then |
| 71 | return |
| 72 | end if |
| 73 | |
| 74 | ! Get the matching bracket character |
| 75 | target_char = get_bracket_pair(start_char) |
| 76 | if (target_char == '') return |
| 77 | |
| 78 | ! Determine search direction |
| 79 | search_forward = is_opening_bracket(start_char) |
| 80 | |
| 81 | ! Initialize depth counter |
| 82 | depth = 1 |
| 83 | line_count = buffer_get_line_count(buffer) |
| 84 | |
| 85 | if (search_forward) then |
| 86 | ! Search forward for closing bracket |
| 87 | current_line = start_line |
| 88 | current_col = start_col + 1 |
| 89 | |
| 90 | do while (current_line <= line_count) |
| 91 | line = buffer_get_line(buffer, current_line) |
| 92 | line_len = len(line) |
| 93 | |
| 94 | ! If we're starting a new line, reset column |
| 95 | if (current_line > start_line) then |
| 96 | current_col = 1 |
| 97 | end if |
| 98 | |
| 99 | do while (current_col <= line_len) |
| 100 | if (line(current_col:current_col) == start_char) then |
| 101 | depth = depth + 1 |
| 102 | else if (line(current_col:current_col) == target_char) then |
| 103 | depth = depth - 1 |
| 104 | if (depth == 0) then |
| 105 | found = .true. |
| 106 | match_line = current_line |
| 107 | match_col = current_col |
| 108 | if (allocated(line)) deallocate(line) |
| 109 | return |
| 110 | end if |
| 111 | end if |
| 112 | current_col = current_col + 1 |
| 113 | end do |
| 114 | |
| 115 | if (allocated(line)) deallocate(line) |
| 116 | current_line = current_line + 1 |
| 117 | end do |
| 118 | else |
| 119 | ! Search backward for opening bracket |
| 120 | current_line = start_line |
| 121 | current_col = start_col - 1 |
| 122 | |
| 123 | do while (current_line >= 1) |
| 124 | line = buffer_get_line(buffer, current_line) |
| 125 | line_len = len(line) |
| 126 | |
| 127 | ! If we're starting a new line, reset column to end |
| 128 | if (current_line < start_line) then |
| 129 | current_col = line_len |
| 130 | end if |
| 131 | |
| 132 | do while (current_col >= 1) |
| 133 | if (line(current_col:current_col) == start_char) then |
| 134 | depth = depth + 1 |
| 135 | else if (line(current_col:current_col) == target_char) then |
| 136 | depth = depth - 1 |
| 137 | if (depth == 0) then |
| 138 | found = .true. |
| 139 | match_line = current_line |
| 140 | match_col = current_col |
| 141 | if (allocated(line)) deallocate(line) |
| 142 | return |
| 143 | end if |
| 144 | end if |
| 145 | current_col = current_col - 1 |
| 146 | end do |
| 147 | |
| 148 | if (allocated(line)) deallocate(line) |
| 149 | current_line = current_line - 1 |
| 150 | end do |
| 151 | end if |
| 152 | end subroutine find_matching_bracket |
| 153 | |
| 154 | end module bracket_matching_module |