home *** CD-ROM | disk | FTP | other *** search
- '\"
- '\" Copyright (c) 1993 The Regents of the University of California.
- '\" All rights reserved.
- '\"
- '\" Permission is hereby granted, without written agreement and without
- '\" license or royalty fees, to use, copy, modify, and distribute this
- '\" documentation for any purpose, provided that the above copyright
- '\" notice and the following two paragraphs appear in all copies.
- '\"
- '\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
- '\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- '\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
- '\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- '\"
- '\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- '\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- '\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- '\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
- '\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- '\"
- '\" $Header: /user6/ouster/tcl/man/RCS/switch.n,v 1.2 93/06/17 13:31:26 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
- .\"
- .\" .HS name section [date [version]]
- .\" Replacement for .TH in other man pages. See below for valid
- .\" section names.
- .\"
- .\" .AP type name in/out [indent]
- .\" Start paragraph describing an argument to a library procedure.
- .\" type is type of argument (int, etc.), in/out is either "in", "out",
- .\" or "in/out" to describe whether procedure reads or modifies arg,
- .\" and indent is equivalent to second arg of .IP (shouldn't ever be
- .\" needed; use .AS below instead)
- .\"
- .\" .AS [type [name]]
- .\" Give maximum sizes of arguments for setting tab stops. Type and
- .\" name are examples of largest possible arguments that will be passed
- .\" to .AP later. If args are omitted, default tab stops are used.
- .\"
- .\" .BS
- .\" Start box enclosure. From here until next .BE, everything will be
- .\" enclosed in one large box.
- .\"
- .\" .BE
- .\" End of box enclosure.
- .\"
- .\" .VS
- .\" Begin vertical sidebar, for use in marking newly-changed parts
- .\" of man pages.
- .\"
- .\" .VE
- .\" End of vertical sidebar.
- .\"
- .\" .DS
- .\" Begin an indented unfilled display.
- .\"
- .\" .DE
- .\" End of indented unfilled display.
- .\"
- '\" # Heading for Tcl/Tk man pages
- .de HS
- .ds ^3 \\0
- .if !"\\$3"" .ds ^3 \\$3
- .if '\\$2'cmds' .TH \\$1 1 \\*(^3 \\$4
- .if '\\$2'lib' .TH \\$1 3 \\*(^3 \\$4
- .if '\\$2'tcl' .TH \\$1 n \\*(^3 Tcl "Tcl Built-In Commands"
- .if '\\$2'tk' .TH \\$1 n \\*(^3 Tk "Tk Commands"
- .if '\\$2'tclc' .TH \\$1 3 \\*(^3 Tcl "Tcl Library Procedures"
- .if '\\$2'tkc' .TH \\$1 3 \\*(^3 Tk "Tk Library Procedures"
- .if '\\$2'tclcmds' .TH \\$1 1 \\*(^3 Tk "Tcl Applications"
- .if '\\$2'tkcmds' .TH \\$1 1 \\*(^3 Tk "Tk Applications"
- .if t .wh -1.3i ^B
- .nr ^l \\n(.l
- .ad b
- ..
- '\" # Start an argument description
- .de AP
- .ie !"\\$4"" .TP \\$4
- .el \{\
- . ie !"\\$2"" .TP \\n()Cu
- . el .TP 15
- .\}
- .ie !"\\$3"" \{\
- .ta \\n()Au \\n()Bu
- \&\\$1 \\fI\\$2\\fP (\\$3)
- .\".b
- .\}
- .el \{\
- .br
- .ie !"\\$2"" \{\
- \&\\$1 \\fI\\$2\\fP
- .\}
- .el \{\
- \&\\fI\\$1\\fP
- .\}
- .\}
- ..
- '\" # define tabbing values for .AP
- .de AS
- .nr )A 10n
- .if !"\\$1"" .nr )A \\w'\\$1'u+3n
- .nr )B \\n()Au+15n
- .\"
- .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
- .nr )C \\n()Bu+\\w'(in/out)'u+2n
- ..
- '\" # BS - start boxed text
- '\" # ^y = starting y location
- '\" # ^b = 1
- .de BS
- .br
- .mk ^y
- .nr ^b 1u
- .if n .nf
- .if n .ti 0
- .if n \l'\\n(.lu\(ul'
- .if n .fi
- ..
- '\" # BE - end boxed text (draw box now)
- .de BE
- .nf
- .ti 0
- .mk ^t
- .ie n \l'\\n(^lu\(ul'
- .el \{\
- .\" Draw four-sided box normally, but don't draw top of
- .\" box if the box started on an earlier page.
- .ie !\\n(^b-1 \{\
- \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
- .\}
- .el \}\
- \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
- .\}
- .\}
- .fi
- .br
- .nr ^b 0
- ..
- '\" # VS - start vertical sidebar
- '\" # ^Y = starting y location
- '\" # ^v = 1 (for troff; for nroff this doesn't matter)
- .de VS
- .mk ^Y
- .ie n 'mc \s12\(br\s0
- .el .nr ^v 1u
- ..
- '\" # VE - end of vertical sidebar
- .de VE
- .ie n 'mc
- .el \{\
- .ev 2
- .nf
- .ti 0
- .mk ^t
- \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n'
- .sp -1
- .fi
- .ev
- .\}
- .nr ^v 0
- ..
- '\" # Special macro to handle page bottom: finish off current
- '\" # box/sidebar if in box/sidebar mode, then invoked standard
- '\" # page bottom macro.
- .de ^B
- .ev 2
- 'ti 0
- 'nf
- .mk ^t
- .if \\n(^b \{\
- .\" Draw three-sided box if this is the box's first page,
- .\" draw two sides but no top otherwise.
- .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
- .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
- .\}
- .if \\n(^v \{\
- .nr ^x \\n(^tu+1v-\\n(^Yu
- \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
- .\}
- .bp
- 'fi
- .ev
- .if \\n(^b \{\
- .mk ^y
- .nr ^b 2
- .\}
- .if \\n(^v \{\
- .mk ^Y
- .\}
- ..
- '\" # DS - begin display
- .de DS
- .RS
- .nf
- .sp
- ..
- '\" # DE - end display
- .de DE
- .fi
- .RE
- .sp .5
- ..
- .HS switch tcl 7.0
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- switch \- Evaluate one of several scripts, depending on a given value
- .SH SYNOPSIS
- \fBswitch\fI \fR?\fIoptions\fR?\fI string \fIpattern body \fR?\fIpattern body \fR...?
- .br
- \fBswitch\fI \fR?\fIoptions\fR?\fI string \fR{\fIpattern body \fR?\fIpattern body \fR...?}
- .BE
-
- .SH DESCRIPTION
- .PP
- The \fBswitch\fR command matches its \fIstring\fR argument against each of
- the \fIpattern\fR arguments in order.
- As soon as it finds a \fIpattern\fR that matches \fIstring\fR it
- evaluates the following \fIbody\fR argument by passing it recursively
- to the Tcl interpreter and returns the result of that evaluation.
- If the last \fIpattern\fR argument is \fBdefault\fR then it matches
- anything.
- If no \fIpattern\fR argument
- matches \fIstring\fR and no default is given, then the \fBswitch\fR
- command returns an empty string.
- .PP
- If the initial arguments to \fBswitch\fR start with \fB\-\fR then
- they are treated as options. The following options are
- currently supported:
- .TP 10
- \fB\-exact\fR
- Use exact matching when comparing \fIstring\fR to a pattern. This
- is the default.
- .TP 10
- \fB\-glob\fR
- When matching \fIstring\fR to the patterns, use glob-style matching
- (i.e. the same as implemented by the \fBstring match\fR command).
- .TP 10
- \fB\-regexp\fR
- When matching \fIstring\fR to the patterns, use regular
- expression matching
- (i.e. the same as implemented by the \fBregexp\fR command).
- .TP 10
- \fB\-\|\-\fR
- Marks the end of options. The argument following this one will
- be treated as \fIstring\fR even if it starts with a \fB\-.
- .PP
- Two syntaxes are provided for the \fIpattern\fR and \fIbody\fR arguments.
- The first uses a separate argument for each of the patterns and commands;
- this form is convenient if substitutions are desired on some of the
- patterns or commands.
- The second form places all of the patterns and commands together into
- a single argument; the argument must have proper list structure, with
- the elements of the list being the patterns and commands.
- The second form makes it easy to construct multi-line switch commands,
- since the braces around the whole list make it unnecessary to include a
- backslash at the end of each line.
- Since the \fIpattern\fR arguments are in braces in the second form,
- no command or variable substitutions are performed on them; this makes
- the behavior of the second form different than the first form in some
- cases.
- .PP
- If a \fIbody\fR is specified as ``\fB\-\fR'' it means that the \fIbody\fR
- for the next pattern should also be used as the body for this
- pattern (if the next pattern also has a body of ``\fB\-\fR''
- then the body after that is used, and so on).
- This feature makes it possible to share a single \fIbody\fR among
- several patterns.
- .PP
- Below are some examples of \fBswitch\fR commands:
- .DS
- \fBswitch\0abc\0a\0\-\0b\0{format 1}\0abc\0{format 2}\0default\0{format 3}
- .DE
- will return \fB2\fR,
- .DS
- .ta .5c 1c
- \fBswitch\0\-regexp\0aaab {
- ^a.*b$\0\-
- b\0{format 1}
- a*\0{format 2}
- default\0{format 3}
- }
- .DE
- will return \fB1\fR, and
- .DS
- .ta .5c 1c
- \fBswitch\0xyz {
- a
- \-
- b
- {format 1}
- a*
- {format 2}
- default
- {format 3}
- }
- .DE
- will return \fB3\fR.
-
- .SH KEYWORDS
- switch, match, regular expression
-