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uri(n) Tcl Uniform Resource Identifier Management uri(n)
NAME
uri - URI utilities
SYNOPSIS
package require Tcl 8.2
package require uri ?1.1.1?
uri::split url
uri::join ?key value?...
uri::resolve base url
uri::isrelative url
uri::geturl url ?options...?
uri::canonicalize uri
uri::register schemeList script
DESCRIPTION
This package contains two parts. First it provides regular expressions for a number of url/uri schemes. Second it provides a number of com-
mands for manipulating urls/uris and fetching data specified by them. For the latter this package analyses the requested url/uri and then
dispatches it to the appropriate package (http, ftp, ...) for actual fetching.
COMMANDS
uri::split url
uri::split takes a single url, decodes it and then returns a list of key/value pairs suitable for array set containing the con-
stituents of the url. If the scheme is missing from the url it defaults to http. Currently only the schemes http, ftp, mailto, urn
and file are supported. See section EXTENDING on how to expand that range.
uri::join ?key value?...
uri::join takes a list of key/value pairs (generated by uri::split, for example) and returns the canonical url they represent. Cur-
rently only the schemes http, ftp, mailto, urn and file are supported. See section EXTENDING on how to expand that range.
uri::resolve base url
uri::resolve resolves the specified url relative to base. In other words: A non-relative url is returned unchanged, whereas for a
relative url the missing parts are taken from base and prepended to it. The result of this operation is returned. For an empty url
the result is base.
uri::isrelative url
uri::isrelative determines whether the specified url is absolute or relative.
uri::geturl url ?options...?
uri::geturl decodes the specified url and then dispatches the request to the package appropriate for the scheme found in the url.
The command assumes that the package to handle the given scheme either has the same name as the scheme itself (including possible
capitalization) followed by ::geturl, or, in case of this failing, has the same name as the scheme itself (including possible capi-
talization). It further assumes that whatever package was loaded provides a geturl-command in the namespace of the same name as the
package itself. This command is called with the given url and all given options. Currently geturl does not handle any options
itself.
Note: file-urls are an exception to the rule described above. They are handled internally.
It is not possible to specify results of the command. They depend on the geturl-command for the scheme the request was dispatched
to.
uri::canonicalize uri
uri::canonicalize returns the canonical form of a URI. The canonical form of a URI is one where relative path specifications, ie. .
and .., have been resolved.
uri::register schemeList script
uri::register registers the first element of schemeList as a new scheme and the remaining elements as aliases for this scheme. It
creates the namespace for the scheme and executes the script in the new namespace. The script has to declare variables containing
the regular expressions relevant to the scheme. At least the variable schemepart has to be declared as that one is used to extend
the variables keeping track of the registered schemes.
SCHEMES
In addition to the commands mentioned above this package provides regular expression to recognize urls for a number of url schemes.
For each supported scheme a namespace of the same name as the scheme itself is provided inside of the namespace uri containing the variable
url whose contents are a regular expression to recognize urls of that scheme. Additional variables may contain regular expressions for
parts of urls for that scheme.
The variable uri::schemes contains a list of all supported schemes. Currently these are ftp, file, http, gopher, mailto, news, wais and
prospero.
EXTENDING
Extending the range of schemes supported by uri::split and uri::join is easy because both commands do not handle the request by themselves
but dispatch it to another command in the uri namespace using the scheme of the url as criterion.
uri::split and uri::join call Split[string totitle <scheme>] and Join[string totitle <scheme>] respectively.
CREDITS
Original code by Andreas Kupries. Modularisation by Steve Ball.
KEYWORDS
uri, url, fetching information, www, http, ftp, mailto, gopher, wais, prospero, file
uri 1.1.1 uri(n)