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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"
}
-- Experimental ... names and functionality will change ... just a
-- place to collect code, so:
--
-- DON'T USE THESE FUNCTIONS AS THEY WILL CHANGE!
--
-- 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
-- blob.char
-- blob.line
-- blob.paragraph
-- blob.page
local type, tostring = type, tostring
local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
local report_blobs = logs.reporter("blobs")
local t_tonodes = typesetters.tonodes
local t_hpack = typesetters.hpack
local flush_node_list = node.flush_list
local hpack_node_list = node.hpack
local vpack_node_list = node.vpack
local write_node = node.write
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 ( ( -- needs checking (see elsewhere)
space^0 * (
newline^2 * space^0 * lpeg.Cc("")
+ newline * space^0 * lpeg.Cc(" ")
+ lpeg.Cs(content^1)
)
)^0)
function blobs.new()
return {
list = { },
}
end
function blobs.dispose(t)
local list = t.list
for i=1,#list do
local li = list[i]
local pack = li.pack
if pack then
flush_node_list(pack)
li.pack = nil
end
end
end
function blobs.append(t,str) -- will be link nodes.link
local typ = type(str)
local dummy = nil
if typ == "number" then
str = tostring(str)
typ = "string"
end
local list = t.list
if typ == "string" then
local pars = lpegmatch(ctxtextcapture,str)
local noflist = #list
for p=1,#pars do
local str = pars[p]
if #str == 0 then
noflist = noflist + 1
list[noflist] = { head = nil, tail = nil }
else
local l = list[noflist]
if not l then
l = { head = nil, tail = nil }
noflist = noflist + 1
list[noflist] = l
end
local head, tail = t_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")
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 li = list[i]
local pack = li.pack
if pack then
write_node(pack)
flush_node_list(pack)
li.pack = nil
end
end
end
function blobs.dimensions(t)
local list = t.list
local first = list and list[1]
if first then
local pack = first.pack
return pack.width, pack.height, pack.depth
else
return 0, 0, 0
end
end
-- blob.char
-- blob.line: head, tail
-- blob.paragraph
-- blob.page
--~ local lineblob = {
--~ type = "line",
--~ head = false,
--~ tail = false,
--~ pack = false,
--~ properties = { },
--~ end
--~ local parblob = {
--~ type = "line",
--~ head = false,
--~ tail = false,
--~ pack = false,
--~ properties = { },
--~ end
-- for the moment here:
function commands.widthofstring(str)
local l = t_hpack(str)
context(number.todimen(l.width))
flush_node_list(l)
end
-- less efficient:
--
-- function commands.widthof(str)
-- local b = blobs.new()
-- blobs.append(b,str)
-- blobs.pack(b)
-- local w = blobs.dimensions(b)
-- context(number.todimen(w))
-- blobs.dispose(b)
-- end
|
