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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 next = next
local utfcharacters, utfbyte, utfchar = utf.characters, utf.byte, utf.char
local min, max = math.min, math.max
local setmetatableindex = table.setmetatableindex
local context = context
local ctx_pushcatcodes = context.pushcatcodes
local ctx_popcatcodes = context.popcatcodes
local implement = interfaces.implement
local variables = interfaces.variables
local v_before = variables.before
local v_after = variables.after
local is_letter = characters.is_letter
-- Hyphenating 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 ASCII
-- characters.
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 trace = false trackers.register("hyphenators.urls",function(v) trace = v end)
local report = logs.reporter("hyphenators","urls")
-- 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
-- local b = utfbyte(char)
-- if prev == char and prev == "/" then
-- ctx_c(b)
-- 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(b)
-- elseif how == v_after then
-- word = false
-- ctx_a(b)
-- else
-- local letter = is_letter[char]
-- if length <= left or length >= right then
-- if word and letter then
-- ctx_L(b)
-- else
-- ctx_C(b)
-- end
-- elseif word and letter then
-- ctx_l(b)
-- else
-- ctx_c(b)
-- end
-- word = letter
-- end
-- end
-- if pack then
-- prev = char
-- else
-- prev = nil
-- end
-- end
-- end
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 pack = urls.packslashes
local length = 0
local list = utf.split(str)
local size = #list
local prev = nil
for i=1,size do
local what = nil
local dodi = false
local char = list[i]
length = length + 1
char = mapping[char] or char
if char == disc then
dodi = true
elseif pack and char == "/" and (list[i+1] == "/" or prev == "/") then
what = "c"
else
local how = characters[char]
if how == v_before then
what = "b"
elseif how == v_after then
word = false
what = "a"
else
local letter = is_letter[char]
if length <= left or length >= right then
if word and letter then
what = "L"
else
what = "C"
end
elseif word and letter then
what = "l"
else
what = "c"
end
word = letter
end
end
if dodi then
list[i] = "\\lang_url_d "
else
list[i] = "\\lang_url_" .. what .. "{" .. utfbyte(char) .. "}"
end
prev = char
end
if trace then
report("old : %s",str)
report("new : %t",list)
end
ctx_pushcatcodes("prtcatcodes")
context("%t",list)
ctx_popcatcodes()
end
-- urls.action = function(_,...) action(...) end -- sort of obsolete
table.setmetatablecall(hyphenatedurl,action) -- watch out: a caller
-- todo, no interface in mkiv yet
local registerfunction = context.functions.register
local unregisterfunction = context.functions.unregister
local savelua = token.savelua
local function restorevalues(savedchars,restore)
for k, v in next, savedchars do
characters[k] = v
end
unregisterfunction(restore)
end
function urls.setcharacters(str,value) -- 1, 2 == before, after
local savedchars = { }
local newvalue = value or v_before
for s in utfcharacters(str) do
local oldvalue = characters[s]
if oldvalue ~= newvalue then
savedchars[s] = oldvalue
characters[s] = newvalue
end
end
if next(savedchars) then
local restore = nil
restore = registerfunction(function() restorevalues(savedchars,restore) end)
savelua(restore)
end
end
-- .urls.setcharacters("')]}",2)
implement {
name = "sethyphenatedurlcharacters",
actions = urls.setcharacters,
arguments = "2 strings",
}
implement {
name = "hyphenatedurl",
scope = "private",
actions = function(...) action(hyphenatedurl,...) end,
arguments = { "string", "integer", "integer", "string" }
}
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