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if not modules then modules = { } end modules ['typo-spa'] = {
version = 1.001,
comment = "companion to typo-spa.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- get rid of tex.scale here
local utf = unicode.utf8
local next, type = next, type
local utfchar = utf.char
local trace_spacing = false trackers.register("typesetters.spacing", function(v) trace_spacing = v end)
local report_spacing = logs.reporter("typesetting","spacing")
local nodes, fonts, node = nodes, fonts, node
local has_attribute = node.has_attribute
local unset_attribute = node.unset_attribute
local insert_node_before = node.insert_before
local insert_node_after = node.insert_after
local remove_node = nodes.remove
local fonthashes = fonts.hashes
local fontdata = fonthashes.identifiers
local quaddata = fonthashes.quads
local texattribute = tex.attribute
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local nodepool = nodes.pool
local tasks = nodes.tasks
local new_penalty = nodepool.penalty
local new_glue = nodepool.glue
typesetters = typesetters or { }
local typesetters = typesetters
typesetters.spacings = typesetters.spacings or { }
local spacings = typesetters.spacings
spacings.mapping = spacings.mapping or { }
local a_spacings = attributes.private("spacing")
spacings.attribute = a_spacings
storage.register("typesetters/spacings/mapping", spacings.mapping, "typesetters.spacings.mapping")
local function process(namespace,attribute,head)
local done, mapping = false, spacings.mapping
local start = head
-- head is always begin of par (whatsit), so we have at least two prev nodes
-- penalty followed by glue
while start do
if start.id == glyph_code then
local attr = has_attribute(start,attribute)
if attr and attr > 0 then
local map = mapping[attr]
if map then
map = map[start.char]
unset_attribute(start,attribute) -- needed?
if map then
local left = map.left
local right = map.right
local alternative = map.alternative
local quad = quaddata[start.font]
local prev = start.prev
if left and left ~= 0 and prev then
local ok = false
if alternative == 1 then
local somespace = nodes.somespace(prev,true)
if somespace then
local prevprev = prev.prev
local somepenalty = nodes.somepenalty(prevprev,10000)
if somepenalty then
if trace_spacing then
report_spacing("removing penalty and space before %s (left)", utfchar(start.char))
end
head, _ = remove_node(head,prev,true)
head, _ = remove_node(head,prevprev,true)
else
if trace_spacing then
report_spacing("removing space before %s (left)", utfchar(start.char))
end
head, _ = remove_node(head,prev,true)
end
end
ok = true
else
ok = not (nodes.somespace(prev,true) and nodes.somepenalty(prev.prev,true)) or nodes.somespace(prev,true)
end
if ok then
if trace_spacing then
report_spacing("inserting penalty and space before %s (left)", utfchar(start.char))
end
insert_node_before(head,start,new_penalty(10000))
insert_node_before(head,start,new_glue(tex.scale(quad,left)))
done = true
end
end
local next = start.next
if right and right ~= 0 and next then
local ok = false
if alternative == 1 then
local somepenalty = nodes.somepenalty(next,10000)
if somepenalty then
local nextnext = next.next
local somespace = nodes.somespace(nextnext,true)
if somespace then
if trace_spacing then
report_spacing("removing penalty and space after %s (right)", utfchar(start.char))
end
head, _ = remove_node(head,next,true)
head, _ = remove_node(head,nextnext,true)
end
else
local somespace = nodes.somespace(next,true)
if somespace then
if trace_spacing then
report_spacing("removing space after %s (right)", utfchar(start.char))
end
head, _ = remove_node(head,next,true)
end
end
ok = true
else
ok = not (nodes.somepenalty(next,10000) and nodes.somespace(next.next,true)) or nodes.somespace(next,true)
end
if ok then
if trace_spacing then
report_spacing("inserting penalty and space after %s (right)", utfchar(start.char))
end
insert_node_after(head,start,new_glue(tex.scale(quad,right)))
insert_node_after(head,start,new_penalty(10000))
done = true
end
end
end
end
end
end
start = start.next
end
return head, done
end
local enabled = false
function spacings.setup(id,char,left,right,alternative)
local mapping = spacings.mapping[id]
if not mapping then
mapping = { }
spacings.mapping[id] = mapping
end
local map = mapping[char]
if not map then
map = { }
mapping[char] = map
end
map.left, map.right, map.alternative = left, right, alternative
end
function spacings.set(id)
if not enabled then
tasks.enableaction("processors","typesetters.spacings.handler")
enabled = true
end
texattribute[a_spacings] = id
end
spacings.handler = nodes.installattributehandler {
name = "spacing",
namespace = spacings,
processor = process,
}
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