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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_hspacing = false trackers.register("nodes.hspacing", function(v) trace_hspacing = v end)
local report_spacing = logs.new("spacing")
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 make_penalty_node = nodes.penalty
local make_glue_node = nodes.glue
local glyph = node.id("glyph")
local fontdata = fonts.identifiers
local quaddata = fonts.quads
spacings = spacings or { }
spacings.mapping = spacings.mapping or { }
spacings.attribute = attributes.private("spacing")
storage.register("spacings/mapping", spacings.mapping, "spacings.mapping")
function spacings.setspacing(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.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 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, right, alternative = map.left, map.right, 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_hspacing then
report_spacing("removing penalty and space before %s", utfchar(start.char))
end
head, _ = remove_node(head,prev,true)
head, _ = remove_node(head,prevprev,true)
else
local somespace = nodes.somespace(prev,true)
if somespace then
if trace_hspacing then
report_spacing("removing space before %s", utfchar(start.char))
end
head, _ = remove_node(head,prev,true)
end
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_hspacing then
report_spacing("inserting penalty and space before %s", utfchar(start.char))
end
insert_node_before(head,start,make_penalty_node(10000))
insert_node_before(head,start,make_glue_node(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_hspacing then
report_spacing("removing penalty and space after %s", 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_hspacing then
report_spacing("removing space after %s", 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_hspacing then
report_spacing("inserting penalty and space after %s", utfchar(start.char))
end
insert_node_after(head,start,make_glue_node(tex.scale(quad,right)))
insert_node_after(head,start,make_penalty_node(10000))
done = true
end
end
end
end
end
end
start = start.next
end
return head, done
end
lists.handle_spacing = nodes.install_attribute_handler {
name = "spacing",
namespace = spacings,
processor = spacings.process,
}
function spacings.enable()
tasks.enableaction("processors","lists.handle_spacing")
end
--~ local data = {
--~ name = "spacing",
--~ namespace = spacings,
--~ processor = spacings.process,
--~ }
--~ nodes.process_attribute = process_attribute
--~ function lists.handle_spacing(head)
--~ return process_attribute(head,data)
--~ end
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