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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 flush_node_list = node.flush_list
local hpack_node_list = node.hpack
local vpack_node_list = node.vpack
local write_node = node.write
local typesetters = nodes.typesetters
local tonodes = typesetters.tonodes
local tohpack = typesetters.tohpack
local tohpackfast = typesetters.tohpackfast
local tovpack = typesetters.tovpack
local tovpackfast = typesetters.tovpackfast
blobs = blobs or { }
-- provide copies here (nicer for manuals)
blobs.tonodes = tonodes
blobs.tohpack = tohpack
blobs.tohpackfast = tohpackfast
blobs.tovpack = tovpack
blobs.tovpackfast = tovpackfast
-- end of helpers
local newline = lpeg.patterns.newline
local space = lpeg.patterns.spacer
local newpar = (space^0*newline*space^0)^2
local ctxtextcapture = lpeg.Ct ( ( space^0 * ( newpar + lpeg.Cs(((space^1/" " + 1)-newpar)^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) -- compare concat and link
local typ = type(str)
local dummy = nil
if typ == "number" then
str = tostring(str)
typ = "string"
end
if typ == "string" then
local pars = lpegmatch(ctxtextcapture,str)
local list = t.list
for p=1,#pars do
local head, tail = tonodes(pars[p],nil,nil)
list[#list+1] = { head = head, tail = tail }
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 = vpack_node_list(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:
local function strwd(str)
local l = tohpack(str)
local w = l.width
flush_node_list(l)
return w
end
local function strht(str)
local l = tohpack(str)
local h = l.height
flush_node_list(l)
return h
end
local function strdp(str)
local l = tohpack(str)
local d = l.depth
flush_node_list(l)
return d
end
local function strhd(str)
local l = tohpack(str)
local s = l.height + l.depth
flush_node_list(l)
return s
end
blobs.strwd = strwd
blobs.strht = strht
blobs.strdp = strdp
blobs.strhd = strhd
function commands.strwd(str) context(strwd(str)) end
function commands.strht(str) context(strht(str)) end
function commands.strdp(str) context(strdp(str)) end
function commands.strhd(str) context(strhd(str)) 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
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