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author | William Joye <wjoye@cfa.harvard.edu> | 2019-04-22 15:47:07 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2019-04-22 15:47:07 (GMT) |
commit | b195c291bad9f664e91ed5458ca45561c67874a5 (patch) | |
tree | e2072eea51f523a4f4de726a92e8dcf741c14337 /tcl8.6/doc/array.n | |
parent | 7e8909a08b8e425eeaa69085cbe86e848f2f5650 (diff) | |
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backout tcl/tk 8.6.9
Diffstat (limited to 'tcl8.6/doc/array.n')
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diff --git a/tcl8.6/doc/array.n b/tcl8.6/doc/array.n new file mode 100644 index 0000000..25ad0c6 --- /dev/null +++ b/tcl8.6/doc/array.n @@ -0,0 +1,187 @@ +'\" +'\" Copyright (c) 1993-1994 The Regents of the University of California. +'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH array n 8.3 Tcl "Tcl Built-In Commands" +.so man.macros +.BS +'\" Note: do not modify the .SH NAME line immediately below! +.SH NAME +array \- Manipulate array variables +.SH SYNOPSIS +\fBarray \fIoption arrayName\fR ?\fIarg arg ...\fR? +.BE +.SH DESCRIPTION +.PP +This command performs one of several operations on the +variable given by \fIarrayName\fR. +Unless otherwise specified for individual commands below, +\fIarrayName\fR must be the name of an existing array variable. +The \fIoption\fR argument determines what action is carried +out by the command. +The legal \fIoptions\fR (which may be abbreviated) are: +.TP +\fBarray anymore \fIarrayName searchId\fR +Returns 1 if there are any more elements left to be processed +in an array search, 0 if all elements have already been +returned. +\fISearchId\fR indicates which search on \fIarrayName\fR to +check, and must have been the return value from a previous +invocation of \fBarray startsearch\fR. +This option is particularly useful if an array has an element +with an empty name, since the return value from +\fBarray nextelement\fR will not indicate whether the search +has been completed. +.TP +\fBarray donesearch \fIarrayName searchId\fR +This command terminates an array search and destroys all the +state associated with that search. \fISearchId\fR indicates +which search on \fIarrayName\fR to destroy, and must have +been the return value from a previous invocation of +\fBarray startsearch\fR. Returns an empty string. +.TP +\fBarray exists \fIarrayName\fR +Returns 1 if \fIarrayName\fR is an array variable, 0 if there +is no variable by that name or if it is a scalar variable. +.TP +\fBarray get \fIarrayName\fR ?\fIpattern\fR? +Returns a list containing pairs of elements. The first +element in each pair is the name of an element in \fIarrayName\fR +and the second element of each pair is the value of the +array element. The order of the pairs is undefined. +If \fIpattern\fR is not specified, then all of the elements of the +array are included in the result. +If \fIpattern\fR is specified, then only those elements whose names +match \fIpattern\fR (using the matching rules of +\fBstring match\fR) are included. +If \fIarrayName\fR is not the name of an array variable, or if +the array contains no elements, then an empty list is returned. +If traces on the array modify the list of elements, the elements +returned are those that exist both before and after the call to +\fBarray get\fR. +.TP +\fBarray names \fIarrayName\fR ?\fImode\fR? ?\fIpattern\fR? +Returns a list containing the names of all of the elements in +the array that match \fIpattern\fR. \fIMode\fR may be one of +\fB\-exact\fR, \fB\-glob\fR, or \fB\-regexp\fR. If specified, \fImode\fR +designates which matching rules to use to match \fIpattern\fR against +the names of the elements in the array. If not specified, \fImode\fR +defaults to \fB\-glob\fR. See the documentation for \fBstring match\fR +for information on glob style matching, and the documentation for +\fBregexp\fR for information on regexp matching. +If \fIpattern\fR is omitted then the command returns all of +the element names in the array. If there are no (matching) elements +in the array, or if \fIarrayName\fR is not the name of an array +variable, then an empty string is returned. +.TP +\fBarray nextelement \fIarrayName searchId\fR +Returns the name of the next element in \fIarrayName\fR, or +an empty string if all elements of \fIarrayName\fR have +already been returned in this search. The \fIsearchId\fR +argument identifies the search, and must have +been the return value of an \fBarray startsearch\fR command. +Warning: if elements are added to or deleted from the array, +then all searches are automatically terminated just as if +\fBarray donesearch\fR had been invoked; this will cause +\fBarray nextelement\fR operations to fail for those searches. +.TP +\fBarray set \fIarrayName list\fR +Sets the values of one or more elements in \fIarrayName\fR. +\fIlist\fR must have a form like that returned by \fBarray get\fR, +consisting of an even number of elements. +Each odd-numbered element in \fIlist\fR is treated as an element +name within \fIarrayName\fR, and the following element in \fIlist\fR +is used as a new value for that array element. +If the variable \fIarrayName\fR does not already exist +and \fIlist\fR is empty, +\fIarrayName\fR is created with an empty array value. +.TP +\fBarray size \fIarrayName\fR +Returns a decimal string giving the number of elements in the +array. +If \fIarrayName\fR is not the name of an array then 0 is returned. +.TP +\fBarray startsearch \fIarrayName\fR +This command initializes an element-by-element search through the +array given by \fIarrayName\fR, such that invocations of the +\fBarray nextelement\fR command will return the names of the +individual elements in the array. +When the search has been completed, the \fBarray donesearch\fR +command should be invoked. +The return value is a +search identifier that must be used in \fBarray nextelement\fR +and \fBarray donesearch\fR commands; it allows multiple +searches to be underway simultaneously for the same array. +It is currently more efficient and easier to use either the \fBarray +get\fR or \fBarray names\fR, together with \fBforeach\fR, to iterate +over all but very large arrays. See the examples below for how to do +this. +.TP +\fBarray statistics \fIarrayName\fR +Returns statistics about the distribution of data within the hashtable +that represents the array. This information includes the number of +entries in the table, the number of buckets, and the utilization of +the buckets. +.TP +\fBarray unset \fIarrayName\fR ?\fIpattern\fR? +Unsets all of the elements in the array that match \fIpattern\fR (using the +matching rules of \fBstring match\fR). If \fIarrayName\fR is not the name +of an array variable or there are no matching elements in the array, no +error will be raised. If \fIpattern\fR is omitted and \fIarrayName\fR is +an array variable, then the command unsets the entire array. +The command always returns an empty string. +.SH EXAMPLES +.CS +\fBarray set\fR colorcount { + red 1 + green 5 + blue 4 + white 9 +} + +foreach {color count} [\fBarray get\fR colorcount] { + puts "Color: $color Count: $count" +} + \fB\(->\fR Color: blue Count: 4 + Color: white Count: 9 + Color: green Count: 5 + Color: red Count: 1 + +foreach color [\fBarray names\fR colorcount] { + puts "Color: $color Count: $colorcount($color)" +} + \fB\(->\fR Color: blue Count: 4 + Color: white Count: 9 + Color: green Count: 5 + Color: red Count: 1 + +foreach color [lsort [\fBarray names\fR colorcount]] { + puts "Color: $color Count: $colorcount($color)" +} + \fB\(->\fR Color: blue Count: 4 + Color: green Count: 5 + Color: red Count: 1 + Color: white Count: 9 + +\fBarray statistics\fR colorcount + \fB\(->\fR 4 entries in table, 4 buckets + number of buckets with 0 entries: 1 + number of buckets with 1 entries: 2 + number of buckets with 2 entries: 1 + number of buckets with 3 entries: 0 + number of buckets with 4 entries: 0 + number of buckets with 5 entries: 0 + number of buckets with 6 entries: 0 + number of buckets with 7 entries: 0 + number of buckets with 8 entries: 0 + number of buckets with 9 entries: 0 + number of buckets with 10 or more entries: 0 + average search distance for entry: 1.2 +.CE +.SH "SEE ALSO" +list(n), string(n), variable(n), trace(n), foreach(n) +.SH KEYWORDS +array, element names, search |