1if not modules then modules = { } end modules [ ' l-boolean ' ] = {
2 version = 1 . 001 ,
3 comment = " companion to luat-lib.mkiv " ,
4 author = " Hans Hagen, PRAGMA-ADE, Hasselt NL " ,
5 copyright = " PRAGMA ADE / ConTeXt Development Team " ,
6 license = " see context related readme files "
7}
8
9local type , tonumber = type , tonumber
10
11boolean = boolean or { }
12local boolean = boolean
13
14function boolean . tonumber ( b )
15 if b then return 1 else return 0 end
16end
17
18function toboolean ( str , tolerant )
19 if str = = nil then
20 return false
21 elseif str = = false then
22 return false
23 elseif str = = true then
24 return true
25 elseif str = = " true " then
26 return true
27 elseif str = = " false " then
28 return false
29 elseif not tolerant then
30 return false
31 elseif str = = 0 then
32 return false
33 elseif ( tonumber ( str ) or 0 ) > 0 then
34 return true
35 else
36 return str = = " yes " or str = = " on " or str = = " t "
37 end
38end
39
40string . toboolean = toboolean
41
42function string . booleanstring ( str )
43 if str = = " 0 " then
44 return false
45 elseif str = = " 1 " then
46 return true
47 elseif str = = " " then
48 return false
49 elseif str = = " false " then
50 return false
51 elseif str = = " true " then
52 return true
53 elseif ( tonumber ( str ) or 0 ) > 0 then
54 return true
55 else
56 return str = = " yes " or str = = " on " or str = = " t "
57 end
58end
59
60function string . is_boolean ( str , default , strict )
61 if type ( str ) = = " string " then
62 if str = = " true " or str = = " yes " or str = = " on " or str = = " t " or ( not strict and str = = " 1 " ) then
63 return true
64 elseif str = = " false " or str = = " no " or str = = " off " or str = = " f " or ( not strict and str = = " 0 " ) then
65 return false
66 end
67 end
68 return default
69end
70 |
