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if not modules then modules = { } end modules ['blob-ini'] = {
version = 1.001,
comment = "companion to blob-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- later we will consider an OO variant.
-- This module is just a playground. Occasionally we need to typeset
-- at the lua and and this is one method. In principle we can construct
-- pages this way too which sometimes makes sense in dumb cases. Actually,
-- if one only needs this, one does not really need tex, okay maybe the
-- parbuilder but that one can be simplified as well then.
-- set fonts, attributes
-- rest already done in packers etc
-- add local par whatsit (or wait till cleaned up)
-- collapse or new pars
-- interline spacing etc
-- DON'T USE THESE FUNCTIONS AS THEY WILL CHANGE!
local type = type
local utfvalues = string.utfvalues
local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
local fontdata = fonts.identifiers
local new_glyph_node = nodes.glyph
local new_glue_node = nodes.glyph
local copy_node = node.copy
local copy_node_list = node.copy_list
local insert_node_after = node.insert_after
local flush_node_list = node.flush_list
local hpack_node_list = node.hpack
local vpack_node_list = node.vpack
local write_node = node.write
local current_font = font.current
blobs = blobs or { }
local newline = lpegpatterns.newline
local space = lpegpatterns.spacer
local spacing = newline * space^0
local content = (space^1)/" " + (1-spacing)
local ctxtextcapture = lpeg.Ct ( (
space^0 * (
newline^2 * space^0 * lpeg.Cc("")
+ newline * space^0 * lpeg.Cc(" ")
+ lpeg.Cs(content^1)
)
)^0)
local function tonodes(str,fnt,attr) -- (str,template_glyph)
if not str or str == "" then
return
end
local head, tail, space, fnt, template = nil, nil, nil, nil, nil
if not fnt then
fnt = current_font()
elseif type(fnt) ~= "number" and fnt.id == "glyph" then
fnt, template = nil, fnt
-- else
-- already a number
end
for s in utfvalues(str) do
local n
if s == 32 then
if not space then
local parameters = fontdata[fnt].parameters
space = new_glue_node(parameters.space,parameters.space_stretch,parameters.space_shrink)
n = space
else
n = copy_node(space)
end
elseif template then
n = copy_node(template)
n.char = s
else
n = new_glyph_node(fnt,s)
end
if attr then -- normall false when template
n.attr = copy_node_list(attr)
end
if head then
insert_node_after(head,tail,n)
else
head = n
end
tail = n
end
return head, tail
end
blobs.tonodes = tonodes
function blobs.new()
return {
list = { },
}
end
function blobs.append(t,str)
local kind = type(str)
local dummy = nil
if kind == "string" then
local pars = lpegmatch(ctxtextcapture,str)
local list = t.list
for p=1,#pars do
local str = pars[p]
if #str == 0 then
list[#list+1 ] = { head = nil, tail = nil }
else
local l = list[#list]
if not l then
l = { head = nil, tail = nil }
list[#list+1 ] = l
end
local head, tail = tonodes(str,nil,nil)
if head then
if l.head then
l.tail.next = head
head.prev = l.tail
l.tail = tail
else
l.head, l.tail = head, tail
end
end
end
end
end
end
function blobs.pack(t,how)
local list = t.list
for i=1,#list do
local pack = list[i].pack
if pack then
flush_node_list(node.pack)
end
if how == "vertical" then
-- we need to prepend a local par node
-- list[i].pack = node.vpack(list[i].head,"exactly")
logs.report("blobs","vpack not yet supported")
else
list[i].pack = hpack_node_list(list[i].head,"exactly")
end
end
end
function blobs.write(t)
local list = t.list
for i=1,#list do
local pack = list[i].pack
if pack then
write_node(pack)
end
end
end
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