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if not modules then modules = { } end modules ['spac-chr'] = {
version = 1.001,
comment = "companion to spac-chr.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local byte, lower = string.byte, string.lower
-- beware: attribute copying is bugged ... there will be a proper luatex helper
-- for this
-- to be redone: characters will become tagged spaces instead as then we keep track of
-- spaceskip etc
trace_characters = false trackers.register("typesetters.characters", function(v) trace_characters = v end)
report_characters = logs.reporter("typesetting","characters")
local nodes, node = nodes, node
local insert_node_after = node.insert_after
local remove_node = nodes.remove -- ! nodes
local copy_node_list = node.copy_list
local nodepool = nodes.pool
local tasks = nodes.tasks
local new_penalty = nodepool.penalty
local new_glue = nodepool.glue
local nodecodes = nodes.nodecodes
local skipcodes = nodes.skipcodes
local glyph_code = nodecodes.glyph
local glue_code = nodecodes.glue
local space_skip_code = skipcodes["spaceskip"]
local chardata = characters.data
local typesetters = typesetters
local characters = { }
typesetters.characters = characters
local fonthashes = fonts.hashes
local fontparameters = fonthashes.parameters
local fontcharacters = fonthashes.characters
local fontquads = fonthashes.quads
local a_character = attributes.private("characters")
local a_alignstate = attributes.private("alignstate")
local c_zero = byte('0')
local c_period = byte('.')
local function inject_quad_space(unicode,head,current,fraction)
local attr = current.attr
if fraction ~= 0 then
fraction = fraction * fontquads[current.font]
end
local glue = new_glue(fraction)
-- glue.attr = copy_node_list(attr)
glue.attr = attr
current.attr = nil
glue[a_character] = unicode
head, current = insert_node_after(head,current,glue)
return head, current
end
local function inject_char_space(unicode,head,current,parent)
local attr = current.attr
local font = current.font
local char = fontcharacters[font][parent]
local glue = new_glue(char and char.width or fontparameters[font].space)
-- glue.attr = copy_node_list(current.attr)
glue.attr = current.attr
current.attr = nil
glue[a_character] = unicode
head, current = insert_node_after(head,current,glue)
return head, current
end
local function inject_nobreak_space(unicode,head,current,space,spacestretch,spaceshrink)
local attr = current.attr
local glue = new_glue(space,spacestretch,spaceshrink)
local penalty = new_penalty(10000)
-- glue.attr = copy_node_list(attr)
glue.attr = attr
current.attr = nil
-- penalty.attr = attr
glue[a_character] = unicode
head, current = insert_node_after(head,current,penalty)
head, current = insert_node_after(head,current,glue)
return head, current
end
local methods = {
-- The next one uses an attribute assigned to the character but still we
-- don't have the 'local' value.
[0x00A0] = function(head,current) -- nbsp
local para = fontparameters[current.font]
if current[a_alignstate] == 1 then -- flushright
head, current = inject_nobreak_space(0x00A0,head,current,para.space,0,0)
current.subtype = space_skip_code
else
head, current = inject_nobreak_space(0x00A0,head,current,para.space,para.spacestretch,para.spaceshrink)
end
return head, current
end,
[0x2000] = function(head,current) -- enquad
return inject_quad_space(0x2000,head,current,1/2)
end,
[0x2001] = function(head,current) -- emquad
return inject_quad_space(0x2001,head,current,1)
end,
[0x2002] = function(head,current) -- enspace
return inject_quad_space(0x2002,head,current,1/2)
end,
[0x2003] = function(head,current) -- emspace
return inject_quad_space(0x2003,head,current,1)
end,
[0x2004] = function(head,current) -- threeperemspace
return inject_quad_space(0x2004,head,current,1/3)
end,
[0x2005] = function(head,current) -- fourperemspace
return inject_quad_space(0x2005,head,current,1/4)
end,
[0x2006] = function(head,current) -- sixperemspace
return inject_quad_space(0x2006,head,current,1/6)
end,
[0x2007] = function(head,current) -- figurespace
return inject_char_space(0x2007,head,current,c_zero)
end,
[0x2008] = function(head,current) -- punctuationspace
return inject_char_space(0x2008,head,current,c_period)
end,
[0x2009] = function(head,current) -- breakablethinspace
return inject_quad_space(0x2009,head,current,1/8) -- same as next
end,
[0x200A] = function(head,current) -- hairspace
return inject_quad_space(0x200A,head,current,1/8) -- same as previous (todo)
end,
[0x200B] = function(head,current) -- zerowidthspace
return inject_quad_space(0x200B,head,current,0)
end,
[0x202F] = function(head,current) -- narrownobreakspace
return inject_nobreak_space(0x202F,head,current,fontquads[current.font]/8)
end,
[0x205F] = function(head,current) -- math thinspace
return inject_nobreak_space(0x205F,head,current,fontparameters[current.font].space/8)
end,
-- [0xFEFF] = function(head,current) -- zerowidthnobreakspace
-- return head, current
-- end,
}
function characters.handler(head)
local current = head
local done = false
while current do
local id = current.id
if id == glyph_code then
local next = current.next
local char = current.char
local method = methods[char]
if method then
if trace_characters then
report_characters("replacing character %C, description %a",char,lower(chardata[char].description))
end
head = method(head,current)
head = remove_node(head,current,true)
done = true
end
current = next
else
current = current.next
end
end
return head, done
end
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