diff options
Diffstat (limited to 'lualibs-url.lua')
| -rw-r--r-- | lualibs-url.lua | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/lualibs-url.lua b/lualibs-url.lua new file mode 100644 index 0000000..e3e6f81 --- /dev/null +++ b/lualibs-url.lua @@ -0,0 +1,134 @@ +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 = string.char, string.gmatch, string.gsub +local tonumber, type = tonumber, type +local lpegmatch = lpeg.match + +-- from the spec (on the web): +-- +-- foo://example.com:8042/over/there?name=ferret#nose +-- \_/ \______________/\_________/ \_________/ \__/ +-- | | | | | +-- scheme authority path query fragment +-- | _____________________|__ +-- / \ / \ +-- urn:example:animal:ferret:nose + +url = url or { } + +local function tochar(s) + return char(tonumber(s,16)) +end + +local colon, qmark, hash, slash, percent, endofstring = lpeg.P(":"), lpeg.P("?"), lpeg.P("#"), lpeg.P("/"), lpeg.P("%"), lpeg.P(-1) + +local hexdigit = lpeg.R("09","AF","af") +local plus = lpeg.P("+") +local escaped = (plus / " ") + (percent * lpeg.C(hexdigit * hexdigit) / tochar) + +-- we assume schemes with more than 1 character (in order to avoid problems with windows disks) + +local scheme = lpeg.Cs((escaped+(1-colon-slash-qmark-hash))^2) * colon + lpeg.Cc("") +local authority = slash * slash * lpeg.Cs((escaped+(1- slash-qmark-hash))^0) + lpeg.Cc("") +local path = slash * lpeg.Cs((escaped+(1- qmark-hash))^0) + lpeg.Cc("") +local query = qmark * lpeg.Cs((escaped+(1- hash))^0) + lpeg.Cc("") +local fragment = hash * lpeg.Cs((escaped+(1- endofstring))^0) + lpeg.Cc("") + +local parser = lpeg.Ct(scheme * authority * path * query * fragment) + +-- 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 + +function url.split(str) + return (type(str) == "string" and lpegmatch(parser,str)) or str +end + +-- todo: cache them + +function url.hashed(str) + local s = url.split(str) + local somescheme = s[1] ~= "" + return { + scheme = (somescheme and s[1]) or "file", + authority = s[2], + path = s[3], + query = s[4], + fragment = s[5], + original = str, + noscheme = not somescheme, + } +end + +function url.hasscheme(str) + return url.split(str)[1] ~= "" +end + +function url.addscheme(str,scheme) + return (url.hasscheme(str) and str) or ((scheme or "file:///") .. str) +end + +function url.construct(hash) + local fullurl = hash.sheme .. "://".. hash.authority .. hash.path + if hash.query then + fullurl = fullurl .. "?".. hash.query + end + if hash.fragment then + fullurl = fullurl .. "?".. hash.fragment + end + return fullurl +end + +function url.filename(filename) + local t = url.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): +--~ +--~ function test(str) +--~ print(table.serialize(url.hashed(str))) +--~ end +--~ +--~ test("%56pass%20words") +--~ 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("/etc/passwords") +--~ test("http://www.pragma-ade.com/spaced%20name") + +--~ test("zip:///oeps/oeps.zip#bla/bla.tex") +--~ test("zip:///oeps/oeps.zip?bla/bla.tex") |