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-'\"
-'\" Copyright (c) 2008 Peter Spjuth <pspjuth@users.sourceforge.net>
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.so man.macros
-.TH prefix n 8.6 Tcl "Tcl Built-In Commands"
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-tcl::prefix \- facilities for prefix matching
-.SH SYNOPSIS
-.nf
-\fB::tcl::prefix all\fR \fItable\fR \fIstring\fR
-\fB::tcl::prefix longest\fR \fItable\fR \fIstring\fR
-\fB::tcl::prefix match\fR \fI?option ...?\fR \fItable\fR \fIstring\fR
-.fi
-.BE
-.SH DESCRIPTION
-.PP
-This document describes commands looking up a prefix in a list of strings.
-The following commands are supported:
-.TP
-\fB::tcl::prefix all\fR \fItable\fR \fIstring\fR
-.
-Returns a list of all elements in \fItable\fR that begin with the prefix
-\fIstring\fR.
-.TP
-\fB::tcl::prefix longest\fR \fItable\fR \fIstring\fR
-.
-Returns the longest common prefix of all elements in \fItable\fR that
-begin with the prefix \fIstring\fR.
-.TP
-\fB::tcl::prefix match\fR ?\fIoptions\fR? \fItable\fR \fIstring\fR
-.
-If \fIstring\fR equals one element in \fItable\fR or is a prefix to exactly
-one element, the matched element is returned. If not, the result depends
-on the \fB\-error\fR option. (It is recommended that the \fItable\fR be sorted
-before use with this subcommand, so that the list of matches presented in the
-error message also becomes sorted, though this is not strictly necessary for
-the operation of this subcommand itself.)
-.RS
-.TP
-\fB\-exact\fR\0
-.
-Accept only exact matches.
-.TP
-\fB\-message\0\fIstring\fR
-.
-Use \fIstring\fR in the error message at a mismatch. Default is
-.QW option .
-.TP
-\fB\-error\0\fIoptions\fR
-.
-The \fIoptions\fR are used when no match is found. If \fIoptions\fR is empty,
-no error is generated and an empty string is returned. Otherwise the
-\fIoptions\fR are used as \fBreturn\fR options when generating the error
-message. The default corresponds to setting
-.QW "\-level 0" .
-Example: If
-.QW "\fB\-error\fR {\-errorcode MyError \-level 1}"
-is used, an error would be generated as:
-.RS
-.PP
-.CS
-return \-errorcode MyError \-level 1 \-code error \e
-       "ambiguous option ..."
-.CE
-.RE
-.RE
-.SH "EXAMPLES"
-.PP
-Basic use:
-.PP
-.CS
-namespace import ::tcl::prefix
-\fBprefix match\fR {apa bepa cepa} apa
-     \fI\(-> apa\fR
-\fBprefix match\fR {apa bepa cepa} a
-     \fI\(-> apa\fR
-\fBprefix match\fR \-exact {apa bepa cepa} a
-     \fI\(-> bad option "a": must be apa, bepa, or cepa\fR
-\fBprefix match\fR \-message "switch" {apa ada bepa cepa} a
-     \fI\(-> ambiguous switch "a": must be apa, ada, bepa, or cepa\fR
-\fBprefix longest\fR {fblocked fconfigure fcopy file fileevent flush} fc
-     \fI\(-> fco\fR
-\fBprefix all\fR {fblocked fconfigure fcopy file fileevent flush} fc
-     \fI\(-> fconfigure fcopy\fR
-.CE
-.PP
-Simplifying option matching:
-.PP
-.CS
-array set opts {\-apa 1 \-bepa "" \-cepa 0}
-foreach {arg val} $args {
-    set opts([\fBprefix match\fR {\-apa \-bepa \-cepa} $arg]) $val
-}
-.CE
-.PP
-Creating a \fBswitch\fR that supports prefixes:
-.PP
-.CS
-switch [\fBprefix match\fR {apa bepa cepa} $arg] {
-    apa  { }
-    bepa { }
-    cepa { }
-}
-.CE
-.SH "SEE ALSO"
-lsearch(n), namespace(n), string(n), Tcl_GetIndexFromObj(3)
-.SH "KEYWORDS"
-prefix, table lookup
-'\" Local Variables:
-'\" mode: nroff
-'\" End: