'\"
'\" Generated from file 'uri\&.man' by tcllib/doctools with format 'nroff'
'\"
.TH "uri" 3tcl 1\&.2\&.6 tcllib "Tcl Uniform Resource Identifier Management"
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.BS
.SH NAME
uri \- URI utilities
.SH SYNOPSIS
package require \fBTcl  8\&.2\fR
.sp
package require \fBuri  ?1\&.2\&.6?\fR
.sp
\fBuri::split\fR \fIurl\fR ?\fIdefaultscheme\fR?
.sp
\fBuri::join\fR ?\fIkey\fR \fIvalue\fR?\&.\&.\&.
.sp
\fBuri::resolve\fR \fIbase\fR \fIurl\fR
.sp
\fBuri::isrelative\fR \fIurl\fR
.sp
\fBuri::geturl\fR \fIurl\fR ?\fIoptions\fR\&.\&.\&.?
.sp
\fBuri::canonicalize\fR \fIuri\fR
.sp
\fBuri::register\fR \fIschemeList\fR \fIscript\fR
.sp
.BE
.SH DESCRIPTION
This package contains two parts\&. First it provides regular expressions
for a number of url/uri schemes\&. Second it provides a number of
commands 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\&.
.PP
The package currently does not conform to
RFC 2396 (\fIhttp://www\&.rfc-editor\&.org/rfc/rfc2396\&.txt\fR),
but quite likely should be\&. Patches and other help are welcome\&.
.SH COMMANDS
.TP
\fBuri::split\fR \fIurl\fR ?\fIdefaultscheme\fR?
\fBuri::split\fR takes an \fIurl\fR, decodes it and then returns a
list of key/value pairs suitable for \fBarray set\fR containing the
constituents of the \fIurl\fR\&. If the scheme is missing from the url
it defaults to the value of \fIdefaultscheme\fR if it was specified,
or \fIhttp\fR else\&. Currently only the schemes \fIhttp\fR,
\fIftp\fR, \fImailto\fR, \fIurn\fR, \fInews\fR, \fIldap\fR and
\fIfile\fR are supported by the package itself\&.
See section \fBEXTENDING\fR on how to expand that range\&.
.sp
The set of constituents of an url (= the set of keys in the returned
dictionary) is dependent on the scheme of the url\&. The only key which
is therefore always present is \fBscheme\fR\&. For the following
schemes the constituents and their keys are known:
.RS
.TP
ftp
\fBuser\fR, \fBpwd\fR, \fBhost\fR, \fBport\fR,
\fBpath\fR, \fBtype\fR
.TP
http(s)
\fBuser\fR, \fBpwd\fR, \fBhost\fR, \fBport\fR,
\fBpath\fR, \fBquery\fR, \fBfragment\fR\&. The fragment
is optional\&.
.TP
file
\fBpath\fR, \fBhost\fR\&. The host is optional\&.
.TP
mailto
\fBuser\fR, \fBhost\fR\&. The host is optional\&.
.TP
news
Either \fBmessage-id\fR or \fBnewsgroup-name\fR\&.
.RE
.sp
.TP
\fBuri::join\fR ?\fIkey\fR \fIvalue\fR?\&.\&.\&.
\fBuri::join\fR takes a list of key/value pairs (generated by
\fBuri::split\fR, for example) and returns the canonical url they
represent\&. Currently only the schemes \fIhttp\fR, \fIftp\fR,
\fImailto\fR, \fIurn\fR, \fInews\fR, \fIldap\fR and \fIfile\fR
are supported\&. See section \fBEXTENDING\fR on how to expand that
range\&.
.TP
\fBuri::resolve\fR \fIbase\fR \fIurl\fR
\fBuri::resolve\fR resolves the specified \fIurl\fR relative to
\fIbase\fR\&. In other words: A non-relative \fIurl\fR is returned
unchanged, whereas for a relative \fIurl\fR the missing parts are
taken from \fIbase\fR and prepended to it\&. The result of this
operation is returned\&. For an empty \fIurl\fR the result is
\fIbase\fR\&.
.TP
\fBuri::isrelative\fR \fIurl\fR
\fBuri::isrelative\fR determines whether the specified \fIurl\fR is
absolute or relative\&.
.TP
\fBuri::geturl\fR \fIurl\fR ?\fIoptions\fR\&.\&.\&.?
\fBuri::geturl\fR decodes the specified \fIurl\fR 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 \fB::geturl\fR, or, in case of this
failing, has the same name as the scheme itself (including possible
capitalization)\&. It further assumes that whatever package was loaded
provides a \fBgeturl\fR-command in the namespace of the same name as
the package itself\&. This command is called with the given \fIurl\fR
and all given \fIoptions\fR\&. Currently \fBgeturl\fR does not handle
any options itself\&.
.sp
\fINote:\fR \fIfile\fR-urls are an exception to the rule
described above\&. They are handled internally\&.
.sp
It is not possible to specify results of the command\&. They depend on
the \fBgeturl\fR-command for the scheme the request was dispatched to\&.
.TP
\fBuri::canonicalize\fR \fIuri\fR
\fBuri::canonicalize\fR returns the canonical form of a URI\&.  The
canonical form of a URI is one where relative path specifications,
ie\&. \&. and \&.\&., have been resolved\&.
.TP
\fBuri::register\fR \fIschemeList\fR \fIscript\fR
\fBuri::register\fR registers the first element of \fIschemeList\fR as
a new scheme and the remaining elements as aliases for this scheme\&. It
creates the namespace for the scheme and executes the \fIscript\fR in
the new namespace\&. The script has to declare variables containing the
regular expressions relevant to the scheme\&. At least the variable
\fBschemepart\fR has to be declared as that one is used to extend
the variables keeping track of the registered schemes\&.
.PP
.SH SCHEMES
In addition to the commands mentioned above this package provides
regular expression to recognize urls for a number of url schemes\&.
.PP
For each supported scheme a namespace of the same name as the scheme
itself is provided inside of the namespace \fIuri\fR containing the
variable \fBurl\fR 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\&.
.PP
The variable \fBuri::schemes\fR contains a list of all supported
schemes\&. Currently these are \fIftp\fR, \fIldap\fR, \fIfile\fR,
\fIhttp\fR, \fIgopher\fR, \fImailto\fR, \fInews\fR,
\fIwais\fR and \fIprospero\fR\&.
.SH EXTENDING
Extending the range of schemes supported by \fBuri::split\fR and
\fBuri::join\fR is easy because both commands do not handle the
request by themselves but dispatch it to another command in the
\fIuri\fR namespace using the scheme of the url as criterion\&.
.PP
\fBuri::split\fR and \fBuri::join\fR
call \fBSplit[string totitle <scheme>]\fR
and  \fBJoin[string totitle <scheme>]\fR respectively\&.
.SH CREDITS
.PP
Original code (regular expressions) by Andreas Kupries\&.
Modularisation by Steve Ball, also the split/join/resolve
functionality\&.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIuri\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
fetching information, file, ftp, gopher, http, ldap, mailto, news, prospero, rfc 2255, rfc 2396, uri, url, wais, www
.SH CATEGORY
Networking