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if not modules then modules = { } end modules ['typo-cap'] = {
version = 1.001,
comment = "companion to typo-cap.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type = next, type
local format, insert = string.format, table.insert
local trace_casing = false trackers.register("nodes.casing", function(v) trace_casing = v end)
local has_attribute = node.has_attribute
local unset_attribute = node.unset_attribute
local set_attribute = node.set_attribute
local traverse_id = node.traverse_id
local glyph = node.id("glyph")
local kern = node.id("kern")
local fontdata = fonts.ids
local fontchar = fonts.chr
local chardata = characters.data
cases = cases or { }
cases.actions = { }
cases.attribute = attributes.private("case")
local actions = cases.actions
local lastfont = nil
-- we use char0 as placeholder for the larger font
local function helper(start, code, codes, special, attribute, once)
local char = start.char
local dc = chardata[char]
if dc then
local fnt = start.font
if special then
if start.char == 0 then
lastfont = fnt
local prev, next = start.prev, start.next
prev.next = next
if next then
next.prev = prev
end
return prev, true
elseif lastfont and start.prev.id ~= glyph then
fnt = lastfont
start.font = lastfont
end
end
-- local ifc = fontdata[fnt].characters
local ifc = fontchar[fnt]
local ucs = dc[codes]
if ucs then
local ok = true
for i=1,#ucs do
ok = ok and ifc[ucs[i]]
end
if ok then
local prev, original = start, start
for i=1,#ucs do
local chr = ucs[i]
prev = start
if i == 1 then
start.char = chr
else
local g = copy_node(original)
g.char = chr
local next = start.next
g.prev = start
if next then
g.next = next
start.next = g
next.prev = g
end
start = g
end
end
if once then lastfont = nil end
return prev, true
end
if once then lastfont = nil end
return start, false
end
local uc = dc[code]
if uc and ifc[uc] then
start.char = uc
if once then lastfont = nil end
return start, true
end
end
if once then lastfont = nil end
return start, false
end
actions[1] = function(start,attribute)
lastfont = nil
return helper(start,'uccode','uccodes')
end
actions[2] = function(start,attribute)
lastfont = nil
return helper(start,'lccode','lccodes')
end
actions[3] = function(start,attribute)
lastfont = nil
local prev = start.prev
if prev and prev.id == kern and prev.subtype == 0 then
prev = prev.prev
end
if not prev or prev.id ~= glyph then
--- only the first character is treated
for n in traverse_id(glyph,start.next) do
if has_attribute(n,attribute) then
unset_attribute(n,attribute)
end
end
return helper(start,'uccode','uccodes')
else
return start, false
end
end
actions[4] = function(start,attribute)
lastfont = nil
local prev = start.prev
if prev and prev.id == kern and prev.subtype == 0 then
prev = prev.prev
end
if not prev or prev.id ~= glyph then
return helper(start,'uccode','uccodes')
else
return start, false
end
end
actions[5] = function(start,attribute) -- 3
return helper(start,'uccode','uccodes',true,attribute,true)
end
actions[6] = function(start,attribute) -- 4
return helper(start,'uccode','uccodes',true,attribute,false)
end
actions[8] = function(start)
lastfont = nil
local ch = start.char
local mr = math.random
-- local tfm = fontdata[start.font].characters
local tfm = fontchar[start.font]
if chardata[ch].lccode then
while true do
local d = chardata[mr(1,0xFFFF)]
if d then
local uc = d.uccode
if uc and tfm[uc] then
start.char = uc
return start, true
end
end
end
elseif chardata[ch].uccode then
while true do
local d = chardata[mr(1,0xFFFF)]
if d then
local lc = d.lccode
if lc and tfm[lc] then
start.char = lc
return start, true
end
end
end
else
return start, false
end
end
-- node.traverse_id_attr
function cases.process(namespace,attribute,head) -- not real fast but also not used on much data
lastfont = nil
local done = false
for start in traverse_id(glyph,head) do
local attr = has_attribute(start,attribute)
if attr and attr > 0 then
unset_attribute(start,attribute)
local action = actions[attr]
if action then
local _, ok = action(start,attribute)
done = done and ok
end
end
end
lastfont = nil
return head, done
end
chars.handle_casing = nodes.install_attribute_handler {
name = "case",
namespace = cases,
processor = cases.process,
}
function cases.enable()
tasks.enableaction("processors","chars.handle_casing")
end
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