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if not modules then modules = { } end modules ['l-url'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local char, gmatch, gsub, format, byte, find = string.char, string.gmatch, string.gsub, string.format, string.byte, string.find
local concat = table.concat
local tonumber, type = tonumber, type
local P, C, R, S, Cs, Cc, Ct = lpeg.P, lpeg.C, lpeg.R, lpeg.S, lpeg.Cs, lpeg.Cc, lpeg.Ct
local lpegmatch, lpegpatterns, replacer = lpeg.match, lpeg.patterns, lpeg.replacer
-- from wikipedia:
--
-- foo://username:password@example.com:8042/over/there/index.dtb?type=animal;name=narwhal#nose
-- \_/ \_______________/ \_________/ \__/ \___/ \_/ \______________________/ \__/
-- | | | | | | | |
-- | userinfo hostname port | | query fragment
-- | \________________________________/\_____________|____|/
-- scheme | | | |
-- | authority path | |
-- | | |
-- | path interpretable as filename
-- | ___________|____________ |
-- / \ / \ |
-- urn:example:animal:ferret:nose interpretable as extension
url = url or { }
local url = url
local tochar = function(s) return char(tonumber(s,16)) end
local colon = P(":")
local qmark = P("?")
local hash = P("#")
local slash = P("/")
local percent = P("%")
local endofstring = P(-1)
local hexdigit = R("09","AF","af")
local plus = P("+")
local nothing = Cc("")
local escaped = (plus / " ") + (percent * C(hexdigit * hexdigit) / tochar)
-- we assume schemes with more than 1 character (in order to avoid problems with windows disks)
local scheme = Cs((escaped+(1-colon-slash-qmark-hash))^2) * colon * slash * slash + nothing
local authority = Cs((escaped+(1- slash-qmark-hash))^0) + nothing
local path = slash * Cs((escaped+(1- qmark-hash))^0) + nothing
local query = qmark * Cs((escaped+(1- hash))^0) + nothing
local fragment = hash * Cs((escaped+(1- endofstring))^0) + nothing
local validurl = scheme * authority * path * query * fragment
local parser = Ct(validurl)
lpegpatterns.url = validurl
lpegpatterns.urlsplitter = parser
local escapes = { } ; for i=0,255 do escapes[i] = format("%%%02X",i) end
local escaper = Cs((R("09","AZ","az") + S("-./_") + P(1) / escapes)^0)
lpegpatterns.urlescaper = escaper
-- todo: reconsider Ct as we can as well have five return values (saves a table)
-- so we can have two parsers, one with and one without
local function split(str)
return (type(str) == "string" and lpegmatch(parser,str)) or str
end
local function hasscheme(str)
local scheme = lpegmatch(scheme,str) -- at least one character
return scheme and scheme ~= ""
end
-- todo: cache them
local rootletter = R("az","AZ")
+ S("_-+")
local separator = P("://")
local qualified = P(".")^0 * P("/")
+ rootletter * P(":")
+ rootletter^1 * separator
+ rootletter^1 * P("/")
local rootbased = P("/")
+ rootletter * P(":")
local barswapper = replacer("|",":")
local backslashswapper = replacer("\\","/")
local function hashed(str) -- not yet ok (/test?test)
local s = split(str)
local somescheme = s[1] ~= ""
local somequery = s[4] ~= ""
if not somescheme and not somequery then
s = {
scheme = "file",
authority = "",
path = str,
query = "",
fragment = "",
original = str,
noscheme = true,
filename = str,
}
else -- not always a filename but handy anyway
local authority, path, filename = s[2], s[3]
if authority == "" then
filename = path
else
filename = authority .. "/" .. path
end
s = {
scheme = s[1],
authority = authority,
path = path,
query = s[4],
fragment = s[5],
original = str,
noscheme = false,
filename = filename,
}
end
return s
end
-- Here we assume:
--
-- files: /// = relative
-- files: //// = absolute (!)
--~ table.print(hashed("file://c:/opt/tex/texmf-local")) -- c:/opt/tex/texmf-local
--~ table.print(hashed("file://opt/tex/texmf-local" )) -- opt/tex/texmf-local
--~ table.print(hashed("file:///opt/tex/texmf-local" )) -- opt/tex/texmf-local
--~ table.print(hashed("file:////opt/tex/texmf-local" )) -- /opt/tex/texmf-local
--~ table.print(hashed("file:///./opt/tex/texmf-local" )) -- ./opt/tex/texmf-local
--~ table.print(hashed("c:/opt/tex/texmf-local" )) -- c:/opt/tex/texmf-local
--~ table.print(hashed("opt/tex/texmf-local" )) -- opt/tex/texmf-local
--~ table.print(hashed("/opt/tex/texmf-local" )) -- /opt/tex/texmf-local
url.split = split
url.hasscheme = hasscheme
url.hashed = hashed
function url.addscheme(str,scheme) -- no authority
if hasscheme(str) then
return str
elseif not scheme then
return "file:///" .. str
else
return scheme .. ":///" .. str
end
end
function url.construct(hash) -- dodo: we need to escape !
local fullurl, f = { }, 0
local scheme, authority, path, query, fragment = hash.scheme, hash.authority, hash.path, hash.query, hash.fragment
if scheme and scheme ~= "" then
f = f + 1 ; fullurl[f] = scheme .. "://"
end
if authority and authority ~= "" then
f = f + 1 ; fullurl[f] = authority
end
if path and path ~= "" then
f = f + 1 ; fullurl[f] = "/" .. path
end
if query and query ~= "" then
f = f + 1 ; fullurl[f] = "?".. query
end
if fragment and fragment ~= "" then
f = f + 1 ; fullurl[f] = "#".. fragment
end
return lpegmatch(escaper,concat(fullurl))
end
function url.filename(filename)
local t = hashed(filename)
return (t.scheme == "file" and (gsub(t.path,"^/([a-zA-Z])([:|])/)","%1:"))) or filename
end
function url.query(str)
if type(str) == "string" then
local t = { }
for k, v in gmatch(str,"([^&=]*)=([^&=]*)") do
t[k] = v
end
return t
else
return str
end
end
--~ print(url.filename("file:///c:/oeps.txt"))
--~ print(url.filename("c:/oeps.txt"))
--~ print(url.filename("file:///oeps.txt"))
--~ print(url.filename("file:///etc/test.txt"))
--~ print(url.filename("/oeps.txt"))
--~ from the spec on the web (sort of):
--~ local function test(str)
--~ local t = url.hashed(str)
--~ t.constructed = url.construct(t)
--~ print(table.serialize(t))
--~ end
--~ test("sys:///./colo-rgb")
--~ test("/data/site/output/q2p-develop/resources/ecaboperception4_res/topicresources/58313733/figuur-cow.jpg")
--~ test("file:///M:/q2p/develop/output/q2p-develop/resources/ecaboperception4_res/topicresources/58313733")
--~ test("M:/q2p/develop/output/q2p-develop/resources/ecaboperception4_res/topicresources/58313733")
--~ test("file:///q2p/develop/output/q2p-develop/resources/ecaboperception4_res/topicresources/58313733")
--~ test("/q2p/develop/output/q2p-develop/resources/ecaboperception4_res/topicresources/58313733")
--~ test("file:///cow%20with%20spaces")
--~ test("file:///cow%20with%20spaces.pdf")
--~ test("cow%20with%20spaces.pdf")
--~ test("some%20file")
--~ test("/etc/passwords")
--~ test("http://www.myself.com/some%20words.html")
--~ test("file:///c:/oeps.txt")
--~ test("file:///c|/oeps.txt")
--~ test("file:///etc/oeps.txt")
--~ test("file://./etc/oeps.txt")
--~ test("file:////etc/oeps.txt")
--~ test("ftp://ftp.is.co.za/rfc/rfc1808.txt")
--~ test("http://www.ietf.org/rfc/rfc2396.txt")
--~ test("ldap://[2001:db8::7]/c=GB?objectClass?one#what")
--~ test("mailto:John.Doe@example.com")
--~ test("news:comp.infosystems.www.servers.unix")
--~ test("tel:+1-816-555-1212")
--~ test("telnet://192.0.2.16:80/")
--~ test("urn:oasis:names:specification:docbook:dtd:xml:4.1.2")
--~ test("http://www.pragma-ade.com/spaced%20name")
--~ test("zip:///oeps/oeps.zip#bla/bla.tex")
--~ test("zip:///oeps/oeps.zip?bla/bla.tex")
--~ table.print(url.hashed("/test?test"))
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