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if not modules then modules = { } end modules ['lang-url'] = {
version = 1.001,
comment = "companion to lang-url.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local utf = unicode.utf8
local utfcharacters, utfvalues = string.utfcharacters, string.utfvalues
local utfbyte, utfgsub = utf.byte, utf.gsub
local ctxcatcodes = tex.ctxcatcodes
commands = commands or { }
--[[
<p>Hyphenating <l n='url'/>'s is somewhat tricky and a matter of taste. I did
consider using a dedicated hyphenation pattern or dealing with it by node
parsing, but the following solution suits as well. After all, we're mostly
dealing with <l n='ascii'/> characters.</p>
]]--
do
commands.hyphenatedurl = commands.hyphenatedurl or { }
commands.hyphenatedurl.characters = {
["!"] = 1,
["\""] = 1,
["#"] = 1,
["$"] = 1,
["%"] = 1,
["&"] = 1,
["("] = 1,
["*"] = 1,
["+"] = 1,
[","] = 1,
["-"] = 1,
["."] = 1,
["/"] = 1,
[":"] = 1,
[";"] = 1,
["<"] = 1,
["="] = 1,
[">"] = 1,
["?"] = 1,
["@"] = 1,
["["] = 1,
["\\"] = 1,
["^"] = 1,
["_"] = 1,
["`"] = 1,
["{"] = 1,
["|"] = 1,
["~"] = 1,
["'"] = 2,
[")"] = 2,
["]"] = 2,
["}"] = 2
}
commands.hyphenatedurl.lefthyphenmin = 2
commands.hyphenatedurl.righthyphenmin = 3
local chars = commands.hyphenatedurl.characters
function commands.hyphenatedurl.convert(str, left, right)
local n = 0
local b = math.max(left or commands.hyphenatedurl.lefthyphenmin,2)
local e = math.min(#str-(right or commands.hyphenatedurl.righthyphenmin)+2,#str)
str = utfgsub(str,"(.)",function(s)
n = n + 1
local c = chars[s]
if not c or n<=b or n>=e then
return "\\n{" .. utfbyte(s) .. "}"
elseif c == 1 then
return "\\b{" .. utfbyte(s) .. "}"
elseif c == 2 then
return "\\a{" .. utfbyte(s) .. "}"
end
end )
return str
end
function commands.hyphenatedurl.action(str, left, right)
tex.sprint(ctxcatcodes,commands.hyphenatedurl.convert(str, left, right))
end
-- todo, no interface in mkiv yet
function commands.hyphenatedurl.setcharacters(str,value) -- 1, 2 == before, after
for s in utfcharacters(str) do
chars[s] = value or 1
end
end
-- commands.hyphenatedurl.setcharacters("')]}",2)
end
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