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Diffstat (limited to 'doc/lsearch.n')
| -rw-r--r-- | doc/lsearch.n | 52 |
1 files changed, 41 insertions, 11 deletions
diff --git a/doc/lsearch.n b/doc/lsearch.n index f7c4976..44ebce4 100644 --- a/doc/lsearch.n +++ b/doc/lsearch.n @@ -7,7 +7,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -.TH lsearch n 8.5 Tcl "Tcl Built-In Commands" +.TH lsearch n 8.6 Tcl "Tcl Built-In Commands" .so man.macros .BS '\" Note: do not modify the .SH NAME line immediately below! @@ -16,7 +16,6 @@ lsearch \- See if a list contains a particular element .SH SYNOPSIS \fBlsearch \fR?\fIoptions\fR? \fIlist pattern\fR .BE - .SH DESCRIPTION .PP This command searches the elements of \fIlist\fR to see if one @@ -27,24 +26,29 @@ If not, the command returns \fB\-1\fR. The \fIoption\fR arguments indicates how the elements of the list are to be matched against \fIpattern\fR and must have one of the values below: .SS "MATCHING STYLE OPTIONS" +.PP If all matching style options are omitted, the default matching style is \fB\-glob\fR. If more than one matching style is specified, the last matching style given takes precedence. .TP \fB\-exact\fR +. \fIPattern\fR is a literal string that is compared for exact equality against each list element. .TP \fB\-glob\fR +. \fIPattern\fR is a glob-style pattern which is matched against each list element using the same rules as the \fBstring match\fR command. .TP \fB\-regexp\fR +. \fIPattern\fR is treated as a regular expression and matched against each list element using the rules described in the \fBre_syntax\fR reference page. .TP \fB\-sorted\fR +. The list elements are in sorted order. If this option is specified, \fBlsearch\fR will use a more efficient searching algorithm to search \fIlist\fR. If no other options are specified, \fIlist\fR is assumed @@ -53,6 +57,7 @@ option is mutually exclusive with \fB\-glob\fR and \fB\-regexp\fR, and is treated exactly like \fB\-exact\fR when either \fB\-all\fR or \fB\-not\fR are specified. .SS "GENERAL MODIFIER OPTIONS" +.PP These options may be given with all matching styles. .TP \fB\-all\fR @@ -63,32 +68,36 @@ indices will be in numeric order. If values are returned, the order of the values will be the order of those values within the input \fIlist\fR. .TP \fB\-inline\fR +. The matching value is returned instead of its index (or an empty string if no value matches.) If \fB\-all\fR is also specified, then the result of the command is the list of all values that matched. .TP \fB\-not\fR +. This negates the sense of the match, returning the index of the first non-matching value in the list. .TP \fB\-start\fR\0\fIindex\fR +. The list is searched starting at position \fIindex\fR. -.VS 8.5 The interpretation of the \fIindex\fR value is the same as for the command \fBstring index\fR, supporting simple index arithmetic and indices relative to the end of the list. -.VE 8.5 .SS "CONTENTS DESCRIPTION OPTIONS" +.PP These options describe how to interpret the items in the list being searched. They are only meaningful when used with the \fB\-exact\fR and \fB\-sorted\fR options. If more than one is specified, the last one takes precedence. The default is \fB\-ascii\fR. .TP \fB\-ascii\fR +. The list elements are to be examined as Unicode strings (the name is for backward-compatibility reasons.) .TP \fB\-dictionary\fR +. The list elements are to be compared using dictionary-style comparisons (see \fBlsort\fR for a fuller description). Note that this only makes a meaningful difference from the \fB\-ascii\fR option when @@ -96,49 +105,67 @@ the \fB\-sorted\fR option is given, because values are only dictionary-equal when exactly equal. .TP \fB\-integer\fR +. The list elements are to be compared as integers. -.VS 8.5 .TP \fB\-nocase\fR +. Causes comparisons to be handled in a case-insensitive manner. Has no effect if combined with the \fB\-dictionary\fR, \fB\-integer\fR, or \fB\-real\fR options. -.VE 8.5 .TP \fB\-real\fR +. The list elements are to be compared as floating-point values. .SS "SORTED LIST OPTIONS" +.PP These options (only meaningful with the \fB\-sorted\fR option) specify how the list is sorted. If more than one is given, the last one takes precedence. The default option is \fB\-increasing\fR. .TP \fB\-decreasing\fR +. The list elements are sorted in decreasing order. This option is only meaningful when used with \fB\-sorted\fR. .TP \fB\-increasing\fR +. The list elements are sorted in increasing order. This option is only meaningful when used with \fB\-sorted\fR. +.TP +\fB\-bisect\fR +.VS 8.6 +Inexact search when the list elements are in sorted order. For an increasing +list the last index where the element is less than or equal to the pattern +is returned. For a decreasing list the last index where the element is greater +than or equal to the pattern is returned. If the pattern is before the first +element or the list is empty, -1 is returned. +This option implies \fB\-sorted\fR and cannot be used with either \fB\-all\fR +or \fB\-not\fR. +.VE 8.6 .SS "NESTED LIST OPTIONS" -.VS 8.5 +.PP These options are used to search lists of lists. They may be used with any other options. .TP \fB\-index\fR\0\fIindexList\fR +. This option is designed for use when searching within nested lists. The \fIindexList\fR argument gives a path of indices (much as might be used with the \fBlindex\fR or \fBlset\fR commands) within each element to allow the location of the term being matched against. .TP \fB\-subindices\fR +. If this option is given, the index result from this command (or every index result when \fB\-all\fR is also specified) will be a complete path (suitable for use with \fBlindex\fR or \fBlset\fR) within the overall list to the term found. This option has no effect unless the -\fI\-index\fR is also specified, and is just a convenience short-cut. -.VE 8.5 +\fB\-index\fR is also specified, and is just a convenience short-cut. .SH EXAMPLES +.PP Basic searching: +.PP .CS \fBlsearch\fR {a b c d e} c \fI\(-> 2\fR @@ -147,6 +174,7 @@ Basic searching: .CE .PP Using \fBlsearch\fR to filter lists: +.PP .CS \fBlsearch\fR -inline {a20 b35 c47} b* \fI\(-> b35\fR @@ -161,18 +189,21 @@ Using \fBlsearch\fR to filter lists: This can even do a .QW set-like removal operation: +.PP .CS \fBlsearch\fR -all -inline -not -exact {a b c a d e a f g a} a \fI\(-> b c d e f g\fR .CE .PP Searching may start part-way through the list: +.PP .CS \fBlsearch\fR -start 3 {a b c a b c} c \fI\(-> 5\fR .CE .PP It is also possible to search inside elements: +.PP .CS \fBlsearch\fR -index 1 -all -inline {{a abc} {b bcd} {c cde}} *bc* \fI\(-> {a abc} {b bcd}\fR @@ -180,10 +211,9 @@ It is also possible to search inside elements: .SH "SEE ALSO" foreach(n), list(n), lappend(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n), lrange(n), lreplace(n), -.VS 8.5 string(n) -.VE .SH KEYWORDS +binary search, linear search, list, match, pattern, regular expression, search, string '\" Local Variables: '\" mode: nroff |