1if not modules then modules = { } end modules [ ' font-imp-combining ' ] = {
2 version = 1 . 001 ,
3 comment = " companion to font-ini.mkiv " ,
4 author = " Hans Hagen, PRAGMA ADE " ,
5 copyright = " ConTeXt Development Team " ,
6 license = " see context related readme files "
7}
8
9if not context then return end
10
11local next , unpack = next , unpack
12local sort , copy , insert = table . sort , table . copy , table . insert
13local setmetatableindex = table . setmetatableindex
14
15local fontdata = fonts . hashes . identifiers
16local otf = fonts . handlers . otf
17
18local nuts = nodes . nuts
19
20local nextnode = nuts . traversers . node
21local ischar = nuts . ischar
22local getprev = nuts . getprev
23local getnext = nuts . getnext
24local setprev = nuts . setprev
25local setnext = nuts . setnext
26local setboth = nuts . setboth
27local setlink = nuts . setlink
28local exchange = nuts . exchange
29
30local class = { }
31local point = { }
32local classes = { }
33local sorters = { }
34local slide = { }
35local count = 0
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59classes . hebr = {
60 [ 0x05C1 ] = 1 , [ 0x05C2 ] = 1 ,
61 [ 0x05BC ] = 2 ,
62 [ 0x05BF ] = 3 ,
63 [ 0x05B9 ] = 4 , [ 0x05BA ] = 4 ,
64 [ 0x0591 ] = 5 , [ 0x0596 ] = 5 , [ 0x059B ] = 5 , [ 0x05A2 ] = 5 , [ 0x05A3 ] = 5 , [ 0x05A4 ] = 5 ,
65 [ 0x05A5 ] = 5 , [ 0x05A6 ] = 5 , [ 0x05A7 ] = 5 , [ 0x05AA ] = 5 , [ 0x05B0 ] = 5 , [ 0x05B1 ] = 5 ,
66 [ 0x05B2 ] = 5 , [ 0x05B3 ] = 5 , [ 0x05B4 ] = 5 , [ 0x05B5 ] = 5 , [ 0x05B6 ] = 5 , [ 0x05B7 ] = 5 ,
67 [ 0x05B8 ] = 5 , [ 0x05BB ] = 5 , [ 0x05BD ] = 5 , [ 0x05C5 ] = 5 , [ 0x05C7 ] = 5 ,
68 [ 0x059A ] = 6 , [ 0x05AD ] = 6 ,
69 [ 0x0307 ] = 7 , [ 0x0593 ] = 7 , [ 0x0594 ] = 7 , [ 0x0595 ] = 7 , [ 0x0597 ] = 7 , [ 0x0598 ] = 7 ,
70 [ 0x059C ] = 7 , [ 0x059D ] = 7 , [ 0x059E ] = 7 , [ 0x059F ] = 7 , [ 0x05A0 ] = 7 , [ 0x05A1 ] = 7 ,
71 [ 0x05A8 ] = 7 , [ 0x05AB ] = 7 , [ 0x05AC ] = 7 , [ 0x05AF ] = 7 , [ 0x05C4 ] = 7 ,
72 [ 0x0592 ] = 8 , [ 0x0599 ] = 8 , [ 0x05A9 ] = 8 , [ 0x05AE ] = 8 ,
73}
74
75sorters . hebr = function ( a , b )
76 return class [ a ] < class [ b ]
77end
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95local function reorder ( head )
96 if count = = 2 then
97 local first = slide [ 1 ]
98 local last = slide [ 2 ]
99 if sorter ( last , first ) then
100 head = exchange ( head , first , last )
101 end
102 elseif count > 1 then
103 local first = slide [ 1 ]
104 local last = slide [ count ]
105 local before = getprev ( first )
106 local after = getnext ( last )
107 setprev ( first )
108 setnext ( last )
109 sort ( slide , sorter )
110 setlink ( unpack ( slide ) )
111 local first = slide [ 1 ]
112 local last = slide [ count ]
113 if before then
114 setlink ( before , first )
115 end
116 setlink ( last , after )
117 if first = = head then
118 head = first
119 end
120 end
121 count = 0
122 return head
123end
124
125local function reorderprocessor ( head , font , attr )
126 local tfmdata = fontdata [ font ]
127 local script = otf . scriptandlanguage ( tfmdata , attr )
128 sorter = sorters [ script ]
129 if sorter then
130 local classes = classes [ script ]
131 for n in nextnode , head do
132 local char , id = ischar ( n , font )
133 if char then
134 local c = classes [ char ]
135 if c then
136 if count = = 0 then
137 count = 1
138 slide = { n }
139 else
140 count = count + 1
141 slide [ count ] = n
142 end
143 class [ n ] = c
144 point [ n ] = char
145 elseif count > 0 then
146 head = reorder ( head )
147 end
148 elseif count > 0 then
149 head = reorder ( head )
150 end
151 end
152 if count > 0 then
153 head = reorder ( head )
154 end
155 end
156 return head
157end
158
159fonts . constructors . features . otf . register {
160 name = " reordercombining " ,
161 description = " reorder combining characters " ,
162
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166 processors = {
167 position = 1 ,
168 node = reorderprocessor ,
169 }
170}
171 |
