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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 utfcharacters, utfvalues, utfbyte, utfchar = utf.characters, utf.values, utf.byte, utf.char
local min, max = math.min, math.max
local context = context
local implement = interfaces.implement
local variables = interfaces.variables
local v_before = variables.before
local v_after = variables.after
local is_letter = characters.is_letter
--[[
<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>
]]--
local urls = { }
languages.urls = urls
local characters = utilities.storage.allocate {
["!"] = "before",
['"'] = "before",
["#"] = "before",
["$"] = "before",
["%"] = "before",
["&"] = "before",
["("] = "before",
["*"] = "before",
["+"] = "before",
[","] = "before",
["-"] = "before",
["."] = "before",
["/"] = "before",
[":"] = "before",
[";"] = "before",
["<"] = "before",
["="] = "before",
[">"] = "before",
["?"] = "before",
["@"] = "before",
["["] = "before",
["\\"] = "before",
["^"] = "before",
["_"] = "before",
["`"] = "before",
["{"] = "before",
["|"] = "before",
["~"] = "before",
["'"] = "after",
[")"] = "after",
["]"] = "after",
["}"] = "after",
}
local mapping = utilities.storage.allocate {
-- [utfchar(0xA0)] = "~", -- nbsp (catch)
}
urls.characters = characters
urls.mapping = mapping
urls.lefthyphenmin = 2
urls.righthyphenmin = 3
urls.discretionary = nil
urls.packslashes = false
directives.register("hyphenators.urls.packslashes",function(v)
urls.packslashes = v
end)
local ctx_a = context.a
local ctx_b = context.b
local ctx_d = context.d
local ctx_c = context.c
local ctx_l = context.l
local ctx_C = context.C
local ctx_L = context.L
local function action(hyphenatedurl,str,left,right,disc)
--
left = max( left or urls.lefthyphenmin, 2)
right = min(#str-(right or urls.righthyphenmin)+2,#str)
disc = disc or urls.discretionary
--
local word = nil
local prev = nil
local pack = urls.packslashes
local length = 0
--
for char in utfcharacters(str) do
length = length + 1
char = mapping[char] or char
if prev == char and prev == "/" then
ctx_c(utfbyte(char))
elseif char == disc then
ctx_d()
else
if prev == "/" then
ctx_d()
end
local how = characters[char]
if how == v_before then
word = false
ctx_b(utfbyte(char))
elseif how == v_after then
word = false
ctx_a(utfbyte(char))
else
local letter = is_letter[char]
if length <= left or length >= right then
if word and letter then
ctx_L(utfbyte(char))
else
ctx_C(utfbyte(char))
end
elseif word and letter then
ctx_l(utfbyte(char))
else
ctx_c(utfbyte(char))
end
word = letter
end
end
if pack then
prev = char
end
end
end
-- urls.action = function(_,...) action(...) end -- sort of obsolete
table.setmetatablecall(hyphenatedurl,action) -- watch out: a caller
-- todo, no interface in mkiv yet
function urls.setcharacters(str,value) -- 1, 2 == before, after
for s in utfcharacters(str) do
characters[s] = value or v_before
end
end
-- .urls.setcharacters("')]}",2)
implement {
name = "sethyphenatedurlcharacters",
actions = urls.setcharacters,
arguments = { "string", "string" }
}
implement {
name = "hyphenatedurl",
scope = "private",
actions = function(...) action(hyphenatedurl,...) end,
arguments = { "string", "integer", "integer", "string" }
}
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