aboutsummaryrefslogtreecommitdiff
path: root/layout.f90
blob: 68badef081467ab13000c8f9c1ba6f3d25cf9995 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
! Copyright (c) 2020 Jeffrey Armstrong <jeff@rainbow-100.com>
!
! 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 shall be used for Good, not Evil.
!
! 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.

module layout
implicit none

    integer, parameter::line_type_text             = 1
    integer, parameter::line_type_preformatted     = 2
    integer, parameter::line_type_link             = 3
    integer, parameter::line_type_indicator        = 99

    type::line
        character(len=:), allocatable::text
        integer::line_type
        
        integer, dimension(:), pointer::breaks
        
        type(line), pointer::next
    end type line

contains

    subroutine layout_lines(first_line, rendering_engine)
    use render
    implicit none
    
        type(line), pointer::first_line
        class(renderer)::rendering_engine
        
        type(line), pointer::walker
        logical::laying_out
        
        walker => first_line
        laying_out = .true.
        
        call rendering_engine%prepare_for_layout()
        
        do while(laying_out)
            
            if(.not. associated(walker%breaks)) then
                select case (walker%line_type)
                    
                    case (line_type_text)
                        walker%breaks => calculate_wrapping(rendering_engine, walker%text)
                    
                    case (line_type_preformatted)
                        walker%breaks => calculate_stop(rendering_engine, walker%text)
                        
                end select
            end if

            select case (walker%line_type)

                case (line_type_text)
                    call render_proportional(rendering_engine, walker%text, walker%breaks)

                case (line_type_preformatted)
                    call render_preformatted(rendering_engine, walker%text, walker%breaks(1))

                case (line_type_link)
                    call render_link(rendering_engine, walker%text)

            end select

            laying_out = associated(walker%next)
            if(laying_out) then
                walker => walker%next
            end if

        end do
        
        call rendering_engine%layout_complete()

    end subroutine layout_lines

    subroutine clear_line_breaks(first_line)
    implicit none

        type(line), intent(inout), pointer::first_line
        type(line), pointer::walker

        walker => first_line

        do while(associated(walker))
            if(associated(walker%breaks)) then
                deallocate(walker%breaks)
                walker%breaks => null()
            end if

            walker => walker%next

        end do

    end subroutine clear_line_breaks

    subroutine free_lines(first_line)
    implicit none

        type(line), intent(inout), pointer::first_line

        type(line), pointer::walker, past

        call clear_line_breaks(first_line)

        walker => first_line

        do while(associated(walker))
            if(allocated(walker%text)) then
                deallocate(walker%text)
            end if

            past => walker
            walker => walker%next

            deallocate(past)

        end do

        first_line => null()

    end subroutine free_lines

end module layout