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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 commands = commands
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>
]]--
commands.hyphenatedurl = commands.hyphenatedurl or { }
local hyphenatedurl = commands.hyphenatedurl
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)
}
hyphenatedurl.characters = characters
hyphenatedurl.mapping = mapping
hyphenatedurl.lefthyphenmin = 2
hyphenatedurl.righthyphenmin = 3
hyphenatedurl.discretionary = nil
-- more fun is to write nodes .. maybe it's nicer to do this
-- in an attribute handler anyway
-- local ctx_a = context.a
-- local ctx_b = context.b
-- local ctx_d = context.d
-- local ctx_n = context.n
-- local ctx_s = context.s
-- local function action(hyphenatedurl,str,left,right,disc)
-- local n = 0
-- local b = math.max( left or hyphenatedurl.lefthyphenmin, 2)
-- local e = math.min(#str-(right or hyphenatedurl.righthyphenmin)+2,#str)
-- local d = disc or hyphenatedurl.discretionary
-- local p = nil
-- for s in utfcharacters(str) do
-- n = n + 1
-- s = mapping[s] or s
-- if n > 1 then
-- ctx_s() -- can be option
-- end
-- if s == d then
-- ctx_d(utfbyte(s))
-- else
-- local c = characters[s]
-- if not c or n <= b or n >= e then
-- ctx_n(utfbyte(s))
-- elseif c == 1 then
-- ctx_b(utfbyte(s))
-- elseif c == 2 then
-- ctx_a(utfbyte(s))
-- end
-- end
-- p = s
-- end
-- 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)
local n = 0
local b = math.max( left or hyphenatedurl.lefthyphenmin, 2)
local e = math.min(#str-(right or hyphenatedurl.righthyphenmin)+2,#str)
local d = disc or hyphenatedurl.discretionary
local p = nil
for s in utfcharacters(str) do
n = n + 1
s = mapping[s] or s
if s == d then
ctx_d(utfbyte(s))
else
local c = characters[s]
if c == v_before then
p = false
ctx_b(utfbyte(s))
elseif c == v_after then
p = false
ctx_a(utfbyte(s))
else
local l = is_letter[s]
if n <= b or n >= e then
if p and l then
ctx_L(utfbyte(s))
else
ctx_C(utfbyte(s))
end
elseif p and l then
ctx_l(utfbyte(s))
else
ctx_c(utfbyte(s))
end
p = l
end
end
end
end
-- hyphenatedurl.action = function(_,...) action(...) end -- sort of obsolete
table.setmetatablecall(hyphenatedurl,action) -- watch out: a caller
-- todo, no interface in mkiv yet
function hyphenatedurl.setcharacters(str,value) -- 1, 2 == before, after
for s in utfcharacters(str) do
characters[s] = value or v_before
end
end
-- .hyphenatedurl.setcharacters("')]}",2)
implement {
name = "sethyphenatedurlcharacters",
actions = hyphenatedurl.setcharacters,
arguments = { "string", "string" }
}
implement {
name = "hyphenatedurl",
scope = "private",
actions = function(...) action(hyphenatedurl,...) end,
arguments = { "string", "integer", "integer", "string" }
}
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