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-- Copyright 2012 Patrick Gundlach (patrick@gundla.ch)
-- Public repository: https://github.com/pgundlach/lua-check-hyphen
-- Licensed under the MIT license. See the file 'mit-license.txt' for exact terms.
-- Version: 0.3
-- for debugging purpuse:
-- function w( ... )
-- texio.write_nl(string.format(...))
-- end
local explode = function(s,p)
local t = { }
for s in unicode.utf8.gmatch(s,p) do
if s ~= "" then
t[#t+1] = s
end
end
return t
end
luacheckhyphen = {}
local hyphenattr = luatexbase.new_attribute("hyphenattr")
luacheckhyphen.hyphenwords = {}
luacheckhyphen.all_hyphenatedwords = {}
luacheckhyphen.word_whitelist = {}
luacheckhyphen.rectangle = node.new("whatsit","pdf_literal")
luacheckhyphen.rectangle.data = string.format("q 0 0 10 10 re f S Q")
local a_glyph_node = node.id("glyph")
local a_disc_node = node.id("disc")
local a_glue_node = node.id("glue")
local a_whatsit_node = node.id("whatsit")
local subtype_rightskip = 9
luacheckhyphen.deligature = function ( glyph_node )
local sln = unicode.utf8
local head = glyph_node.components
local str = ""
while head do
if head.id == a_glyph_node then
if head.components then
str = str .. luacheckhyphen.deligature(head)
else
str = str .. sln.char(head.char)
end
end
head = head.next
end
return str
end
luacheckhyphen.collect_discs = function(head)
local word_start
local word
-- this is where we store all the breakpoints
local thisbreakpoint
local word_with_hyphen
local c
local hyphencounter = #luacheckhyphen.hyphenwords + 1
local sln = unicode.utf8
local ligature_chars
while head do
if head.id == 0 then
elseif head.id == a_disc_node then
word_start = head
word_end = head
while word_start.prev and word_start.prev.id ~= a_glue_node do
word_start = word_start.prev
end
word = ""
c = 0
while word_start and word_start.id ~= a_glue_node do
if word_start == head then -- disc
-- there is a breakpoint after letter c
node.set_attribute(head,hyphenattr,hyphencounter)
thisbreakpoint = c
elseif word_start.id == a_glyph_node then
if word_start.components then
ligature_chars = luacheckhyphen.deligature(word_start)
word = word .. ligature_chars
c = c + string.len(ligature_chars)
elseif sln.match(sln.char(word_start.char),"%a") then
c = c + 1
word = word .. sln.char(word_start.char)
end
end
word_start = word_start.next
end
if thisbreakpoint then
word_with_hyphen = sln.sub(word,1,thisbreakpoint) .. "-" .. sln.sub(word,thisbreakpoint+1,-1)
luacheckhyphen.hyphenwords[hyphencounter] = word_with_hyphen
hyphencounter = #luacheckhyphen.hyphenwords + 1
end
end
head = head.next
end
return true
end
luacheckhyphen.check_discs = function (head,parent)
local c
local word
local tmp
while head do
if head.id < 2 then -- a box, recurse
luacheckhyphen.check_discs(head.list,head)
-- package luashowhyphens has disc-whatsit-rightskip, without luashowhyphens it is disc-rightskip
elseif head.id == a_disc_node and head.next and head.next.id == a_glue_node and head.next.subtype == subtype_rightskip or
head.id == a_disc_node and head.next and head.next.next and head.next.id == a_whatsit_node and head.next.next.id == a_glue_node and head.next.next.subtype == subtype_rightskip then
c = node.has_attribute(head,hyphenattr)
word = luacheckhyphen.hyphenwords[c]
if luacheckhyphen.word_whitelist[word] then
-- word found, but OK (whitelisted)
else
luacheckhyphen.all_hyphenatedwords[word] = true
if luacheckhyphen.drawmarks then
tmp = node.copy(luacheckhyphen.rectangle)
node.insert_after(parent,head,tmp)
end
end
end
head = head.next
end
return true
end
luacheckhyphen.listhyphenatedwords = function()
if luacheckhyphen.final == "true" then
return
end
-- don't write if the use has turned that off!
if not luacheckhyphen.nofile then
local unknown_hyphenation_filename = tex.jobname .. ".uhy"
local unknown_hyphenation_file = io.open(unknown_hyphenation_filename,"w")
for k,v in pairs(luacheckhyphen.all_hyphenatedwords) do
unknown_hyphenation_file:write(k .. "\n")
end
unknown_hyphenation_file:close()
end
texio.write_nl("log","All words with unknown hyphenation below")
for k,v in pairs(luacheckhyphen.all_hyphenatedwords) do
texio.write_nl("log",k)
end
end
luacheckhyphen.enable = function()
if luacheckhyphen.final == "true" then
return
end
local whitelistfile,err
local filecontents
if luacheckhyphen.whitelist then
for i,v in ipairs(string.explode(luacheckhyphen.whitelist,",")) do
whitelistfile,err = io.open(v)
if not whitelistfile then
texio.write_nl(err)
else
filecontents = whitelistfile:read("*a")
for _,entry in ipairs(explode(filecontents,"[^%s]+")) do
luacheckhyphen.word_whitelist[entry] = true
end
end
end
end
if luacheckhyphen.mark == "true" then
luacheckhyphen.drawmarks = true
end
luatexbase.add_to_callback("pre_linebreak_filter", luacheckhyphen.collect_discs,"collect_discs")
luatexbase.add_to_callback("post_linebreak_filter",luacheckhyphen.check_discs,"check_discs")
end
return luacheckhyphen
-- end of file
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