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if not modules then modules = { } end modules ['typo-rep'] = {
version = 1.001,
comment = "companion to node-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This was rather boring to program (more of the same) but I could
-- endure it by listening to a couple cd's by The Scene and The Lau
-- on the squeezebox on my desk.
local trace_stripping = false trackers.register("nodes.stripping", function(v) trace_stripping = v end)
trackers.register("fonts.stripping", function(v) trace_stripping = v end)
local report_stripping = logs.reporter("fonts","stripping")
local nodes, node = nodes, node
local delete_node = nodes.delete
local replace_node = nodes.replace
local copy_node = node.copy
local has_attribute = node.has_attribute
local chardata = characters.data
local collected = false
local a_stripping = attributes.private("stripping")
local fontdata = fonts.hashes.identifiers
local tasks = nodes.tasks
local texattribute = tex.attribute
local unsetvalue = attributes.unsetvalue
local v_reset = interfaces.variables.reset
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
-- todo: other namespace -> typesetters
nodes.stripping = nodes.stripping or { } local stripping = nodes.stripping
stripping.glyphs = stripping.glyphs or { } local glyphs = stripping.glyphs
local function initialize()
for k,v in next, chardata do
if v.category == "cf" and v.visible ~= "yes" then
if not glyphs[k] then
glyphs[k] = true
end
end
end
initialize = nil
end
local function process(what,head,current,char)
if what == true then
if trace_stripping then
report_stripping("deleting 0x%05X from text",char)
end
head, current = delete_node(head,current)
elseif type(what) == "function" then
head, current = what(head,current)
current = current.next
if trace_stripping then
report_stripping("processing 0x%05X in text",char)
end
elseif what then -- assume node
head, current = replace_node(head,current,copy_node(what))
current = current.next
if trace_stripping then
report_stripping("replacing 0x%05X in text",char)
end
end
return head, current
end
function nodes.handlers.stripping(head)
local current, done = head, false
while current do
if current.id == glyph_code then
-- it's more efficient to keep track of what needs to be kept
local todo = has_attribute(current,a_stripping)
if todo == 1 then
local char = current.char
local what = glyphs[char]
if what then
head, current = process(what,head,current,char)
done = true
else -- handling of spacing etc has to be done elsewhere
current = current.next
end
else
current = current.next
end
else
current = current.next
end
end
return head, done
end
local enabled = false
function stripping.set(n) -- number or 'reset'
if n == v_reset then
n = unsetvalue
else
n = tonumber(n)
if n then
if not enabled then
if initialize then initialize() end
tasks.enableaction("processors","nodes.handlers.stripping")
enabled = true
end
else
n = unsetvalue
end
end
texattribute[a_stripping] = n
end
-- why not in task-ini?
tasks.appendaction("processors","fonts","nodes.handlers.stripping",nil,"nodes.handlers.characters")
tasks.disableaction("processors","nodes.handlers.stripping")
-- interface
commands.setcharacterstripping = stripping.set
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