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if not modules then modules = { } end modules ['typo-drp'] = {
version = 1.001,
comment = "companion to typo-drp.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This ons is sensitive for order (e.g. when combined with first line
-- processing.
local tonumber, type, next = tonumber, type, next
local ceil = math.ceil
local utfbyte = utf.byte
local utfchar = utf.char
local trace_initials = false trackers.register("typesetters.initials", function(v) trace_initials = v end)
local report_initials = logs.reporter("nodes","initials")
local initials = typesetters.paragraphs or { }
typesetters.initials = initials or { }
local nodes = nodes
local tasks = nodes.tasks
local hpack_nodes = nodes.hpack
local nodecodes = nodes.nodecodes
local whatsitcodes = nodes.whatsitcodes
local nodepool = nodes.pool
local new_kern = nodepool.kern
local insert_before = nodes.insert_before
local insert_after = nodes.insert_after
local variables = interfaces.variables
local v_default = variables.default
local v_margin = variables.margin
local texget = tex.get
local texsetattribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local glyph_code = nodecodes.glyph
local hlist_code = nodecodes.hlist
local kern_node = nodecodes.kern
local whatsit_code = nodecodes.whatsit
local localpar_code = whatsitcodes.localpar
local actions = { }
initials.actions = actions
local a_initial = attributes.private("initial")
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local a_colorspace = attributes.private('colormodel')
local settings = nil
function initials.set(specification)
settings = specification or { }
settings.enabled = true
tasks.enableaction("processors","typesetters.initials.handler")
if trace_initials then
report_initials("enabling initials")
end
texsetattribute(a_initial,1)
end
commands.setinitial = initials.set
-- dropped caps experiment (will be done properly when luatex
-- stores the state in the local par node) .. btw, search still
-- works with dropped caps, as does an export
-- we need a 'par' attribute and in fact for dropped caps we don't need
-- need an attribute ... dropit will become s state counter (or end up
-- in the localpar user data
-- for the moment, each paragraph gets a number as id (attribute) ..problem
-- with nesting .. or anyhow, needed for tagging anyway
-- todo: prevent linebreak .. but normally a initial ends up at the top of
-- a page so this has a low priority
actions[v_default] = function(head,setting)
local done = false
if head.id == whatsit_code and head.subtype == localpar_code then
-- begin of par
local first = head.next
-- parbox .. needs to be set at 0
if first and first.id == hlist_code then
first = first.next
end
-- we need to skip over kerns and glues (signals)
while first and first.id ~= glyph_code do
first = first.next
end
if first and first.id == glyph_code then
local char = first.char
local prev = first.prev
local next = first.next
-- if prev.id == hlist_code then
-- -- set the width to 0
-- end
if next and next.id == kern_node then
next.kern = 0
end
if setting.font then
first.font = setting.font
end
if setting.dynamic > 0 then
first[0] = setting.dynamic
end
-- can be a helper
local ma = setting.ma or 0
local ca = setting.ca
local ta = setting.ta
if ca and ca > 0 then
first[a_colorspace] = ma == 0 and 1 or ma
first[a_color] = ca
end
if ta and ta > 0 then
first[a_transparency] = ta
end
--
local width = first.width
local height = first.height
local depth = first.depth
local distance = setting.distance or 0
local voffset = setting.voffset or 0
local hoffset = setting.hoffset or 0
local parindent = tex.parindent
local baseline = texget("baselineskip").width
local lines = tonumber(setting.n) or 0
--
first.xoffset = - width - hoffset - distance - parindent
first.yoffset = - voffset -- no longer - height here
-- We pack so that successive handling cannot touch the dropped cap. Packaging
-- in a hlist is also needed because we cannot locally adapt e.g. parindent (not
-- yet stored in with localpar).
first.prev = nil
first.next = nil
local h = hpack_nodes(first)
h.width = 0
h.height = 0
h.depth = 0
prev.next = h
next.prev = h
h.next = next
h.prev = prev
-- end of packaging
if setting.location == v_margin then
-- okay
else
if lines == 0 then -- safeguard, not too precise
lines = ceil((height+voffset) / baseline)
end
-- We cannot set parshape yet ... when we can I'll add a slope
-- option (positive and negative, in emwidth).
local hangafter = - lines
local hangindent = width + distance + parindent
if trace_initials then
report_initials("setting hangafter to %i and hangindent to %p",hangafter,hangindent)
end
tex.hangafter = hangafter
tex.hangindent = hangindent
if parindent ~= 0 then
insert_after(first,first,new_kern(-parindent))
end
end
done = true
end
end
return head, done
end
local function process(namespace,attribute,head)
local start = head
local attr = nil
while start do
attr = start[attribute]
if attr then
break
elseif start.id == glyph then
break
else
start = start.next
end
end
if attr then
-- here as we can process nested boxes first so we need to keep state
tasks.disableaction("processors","typesetters.initials.handler")
-- texsetattribute(attribute,unsetvalue)
local alternative = settings.alternative or v_default
local action = actions[alternative] or actions[v_default]
if action then
if trace_initials then
report_initials("processing initials, alternative %a",alternative)
end
local head, done = action(head,settings)
return head, done
end
end
return head, false
end
initials.attribute = a_initial
initials.handler = nodes.installattributehandler {
name = "initials",
namespace = initials,
processor = process,
}
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