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tex-compiler/texmf-dist/tex/luatex/lualibs/lualibs-url.lua

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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, format, byte = string.char, string.format, string.byte
local concat = table.concat
local tonumber, type, next = tonumber, type, next
local P, C, R, S, Cs, Cc, Ct, Cf, Cg, V = lpeg.P, lpeg.C, lpeg.R, lpeg.S, lpeg.Cs, lpeg.Cc, lpeg.Ct, lpeg.Cf, lpeg.Cg, lpeg.V
local lpegmatch, lpegpatterns, replacer = lpeg.match, lpeg.patterns, lpeg.replacer
local sortedhash = table.sortedhash
-- 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
--
-- also nice: http://url.spec.whatwg.org/ (maybe some day ...)
url = url or { }
local url = url
local unescapes = { }
local escapes = { }
setmetatable(unescapes, { __index = function(t,k)
local v = char(tonumber(k,16))
t[k] = v
return v
end })
setmetatable(escapes, { __index = function(t,k)
local v = format("%%%02X",byte(k))
t[k] = v
return v
end })
-- okay:
local colon = P(":")
local qmark = P("?")
local hash = P("#")
local slash = P("/")
local atsign = P("@")
local percent = P("%")
local endofstring = P(-1)
local hexdigit = R("09","AF","af")
local plus = P("+")
local nothing = Cc("")
local okay = R("09","AZ","az") + S("-_.,:=+*~!'()@&$")
local escapedchar = (percent * C(hexdigit * hexdigit)) / unescapes
local unescapedchar = P(1) / escapes
local escaped = (plus / " ") + escapedchar -- so no loc://foo++.tex
local noslash = P("/") / ""
local plustospace = P("+")/" "
local decoder = Cs( (
plustospace
+ escapedchar
+ P("\r\n")/"\n"
+ P(1)
)^0 )
local encoder = Cs( (
R("09","AZ","az")^1
+ S("-./_")^1
+ P(" ")/"+"
+ P("\n")/"\r\n"
+ unescapedchar
)^0 )
lpegpatterns.urldecoder = decoder
lpegpatterns.urlencoder = encoder
function url.decode (str) return str and lpegmatch(decoder, str) or str end
function url.encode (str) return str and lpegmatch(encoder, str) or str end
function url.unescape(str) return str and lpegmatch(unescaper,str) or str end
-- we assume schemes with more than 1 character (in order to avoid problems with windows disks)
-- we also assume that when we have a scheme, we also have an authority
--
-- maybe we should already split the query (better for unescaping as = & can be part of a value
local schemestr = Cs((escaped+(1-colon-slash-qmark-hash))^2)
local authoritystr = Cs((escaped+(1- slash-qmark-hash))^0)
local pathstr = Cs((escaped+(1- qmark-hash))^0)
----- querystr = Cs((escaped+(1- hash))^0)
local querystr = Cs(( (1- hash))^0)
local fragmentstr = Cs((escaped+(1- endofstring))^0)
local scheme = schemestr * colon + nothing
local authority = slash * slash * authoritystr + nothing
local path = slash * pathstr + nothing
local query = qmark * querystr + nothing
local fragment = hash * fragmentstr + nothing
local validurl = scheme * authority * path * query * fragment
local parser = Ct(validurl)
lpegpatterns.url = validurl
lpegpatterns.urlsplitter = parser
local escaper = Cs((R("09","AZ","az")^1 + P(" ")/"%%20" + S("-./_:")^1 + P(1) / escapes)^0) -- space happens most
local unescaper = Cs((escapedchar + 1)^0)
local getcleaner = Cs((P("+++")/"%%2B" + P("+")/"%%20" + P(1))^1)
lpegpatterns.urlunescaped = escapedchar
lpegpatterns.urlescaper = escaper
lpegpatterns.urlunescaper = unescaper
lpegpatterns.urlgetcleaner = getcleaner
function url.unescapeget(str)
return lpegmatch(getcleaner,str)
end
-- 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 isscheme = schemestr * colon * slash * slash -- this test also assumes authority
local function hasscheme(str)
if str then
local scheme = lpegmatch(isscheme,str) -- at least one character
return scheme ~= "" and scheme or false
else
return false
end
end
--~ print(hasscheme("home:"))
--~ print(hasscheme("home://"))
-- 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("\\","/")
-- queries:
local equal = P("=")
local amp = P("&")
local key = Cs(((plustospace + escapedchar + 1) - equal )^0)
local value = Cs(((plustospace + escapedchar + 1) - amp - endofstring)^0)
local splitquery = Cf ( Ct("") * P { "sequence",
sequence = V("pair") * (amp * V("pair"))^0,
pair = Cg(key * equal * value),
}, rawset)
-- hasher
local userpart = (1-atsign-colon)^1
local serverpart = (1-colon)^1
local splitauthority = ((Cs(userpart) * colon * Cs(userpart) + Cs(userpart) * Cc(nil)) * atsign + Cc(nil) * Cc(nil))
* Cs(serverpart) * (colon * (serverpart/tonumber) + Cc(nil))
local function hashed(str) -- not yet ok (/test?test)
if not str or str == "" then
return {
scheme = "invalid",
original = str,
}
end
local detailed = split(str)
local rawscheme = ""
local rawquery = ""
local somescheme = false
local somequery = false
if detailed then
rawscheme = detailed[1]
rawquery = detailed[4]
somescheme = rawscheme ~= ""
somequery = rawquery ~= ""
end
if not somescheme and not somequery then
return {
scheme = "file",
authority = "",
path = str,
query = "",
fragment = "",
original = str,
noscheme = true,
filename = str,
}
end
-- not always a filename but handy anyway
local authority = detailed[2]
local path = detailed[3]
local filename -- = nil
local username -- = nil
local password -- = nil
local host -- = nil
local port -- = nil
if authority ~= "" then
-- these can be invalid
username, password, host, port = lpegmatch(splitauthority,authority)
end
if authority == "" then
filename = path
elseif path == "" then
filename = ""
else
-- this one can be can be invalid
filename = authority .. "/" .. path
end
return {
scheme = rawscheme,
authority = authority,
path = path,
query = lpegmatch(unescaper,rawquery), -- unescaped, but possible conflict with & and =
queries = lpegmatch(splitquery,rawquery), -- split first and then unescaped
fragment = detailed[5],
original = str,
noscheme = false,
filename = filename,
--
host = host,
port = port,
-- usename = username,
-- password = password,
}
end
-- inspect(hashed())
-- inspect(hashed(""))
-- inspect(hashed("template:///test"))
-- inspect(hashed("template:///test++.whatever"))
-- inspect(hashed("template:///test%2B%2B.whatever"))
-- inspect(hashed("template:///test%x.whatever"))
-- inspect(hashed("tem%2Bplate:///test%x.whatever"))
-- 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 result, r = { }, 0
local scheme = hash.scheme
local authority = hash.authority
local path = hash.path
local queries = hash.queries
local fragment = hash.fragment
if scheme and scheme ~= "" then
r = r + 1 ; result[r] = lpegmatch(escaper,scheme)
r = r + 1 ; result[r] = "://"
end
if authority and authority ~= "" then
r = r + 1 ; result[r] = lpegmatch(escaper,authority)
end
if path and path ~= "" then
r = r + 1 ; result[r] = "/"
r = r + 1 ; result[r] = lpegmatch(escaper,path)
end
if queries then
local done = false
for k, v in sortedhash(queries) do
r = r + 1 ; result[r] = done and "&" or "?"
r = r + 1 ; result[r] = lpegmatch(escaper,k) -- is this escaped
r = r + 1 ; result[r] = "="
r = r + 1 ; result[r] = lpegmatch(escaper,v) -- is this escaped
done = true
end
end
if fragment and fragment ~= "" then
r = r + 1 ; result[r] = "#"
r = r + 1 ; result[r] = lpegmatch(escaper,fragment)
end
return concat(result)
end
local pattern = Cs(slash^-1/"" * R("az","AZ") * ((S(":|")/":") + P(":")) * slash * P(1)^0)
function url.filename(filename)
local spec = hashed(filename)
local path = spec.path
return (spec.scheme == "file" and path and lpegmatch(pattern,path)) or filename
end
-- print(url.filename("/c|/test"))
-- print(url.filename("/c/test"))
-- print(url.filename("file:///t:/sources/cow.svg"))
local function escapestring(str)
return lpegmatch(escaper,str)
end
url.escape = escapestring
function url.query(str)
if type(str) == "string" then
return lpegmatch(splitquery,str) or ""
else
return str
end
end
function url.toquery(data)
local td = type(data)
if td == "string" then
return #str and escape(data) or nil -- beware of double escaping
elseif td == "table" then
if next(data) then
local t = { }
for k, v in next, data do
t[#t+1] = format("%s=%s",k,escapestring(v))
end
return concat(t,"&")
end
else
-- nil is a signal that no query
end
end
-- /test/ | /test | test/ | test => test
local pattern = Cs(noslash^0 * (1 - noslash * P(-1))^0)
function url.barepath(path)
if not path or path == "" then
return ""
else
return lpegmatch(pattern,path)
end
end
-- print(url.barepath("/test"),url.barepath("test/"),url.barepath("/test/"),url.barepath("test"))
-- print(url.barepath("/x/yz"),url.barepath("x/yz/"),url.barepath("/x/yz/"),url.barepath("x/yz"))
--~ 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
--~ inspect(url.hashed("http://www.pragma-ade.com/test%20test?test=test%20test&x=123%3d45"))
--~ inspect(url.hashed("http://www.pragma-ade.com/test%20test?test=test%20test&x=123%3d45"))
--~ 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"))