124 lines
3.2 KiB
Factor
124 lines
3.2 KiB
Factor
! Copyright (C) 2003, 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: strings USING: generic kernel kernel-internals lists math
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sequences ;
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BUILTIN: string 12 [ 1 "string-length" f ] [ 2 hashcode f ] ;
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M: string = string= ;
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BUILTIN: sbuf 13 ;
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M: sbuf = sbuf= ;
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UNION: text string integer ;
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M: string length string-length ;
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M: string nth string-nth ;
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: f-or-"" ( obj -- ? )
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dup not swap "" = or ;
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: string-length< ( str str -- boolean )
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#! Compare string lengths.
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swap string-length swap string-length < ;
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: cat ( [ "a" "b" "c" ] -- "abc" )
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! If f appears in the list, it is not appended to the
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! string.
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80 <sbuf> swap [ [ over sbuf-append ] when* ] each sbuf>string ;
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: cat2 ( "a" "b" -- "ab" )
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swap
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80 <sbuf>
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dup >r sbuf-append r>
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dup >r sbuf-append r>
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sbuf>string ;
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: cat3 ( "a" "b" "c" -- "abc" )
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[ ] cons cons cons cat ;
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: index-of ( string substring -- index )
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0 -rot index-of* ;
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: string> ( str1 str2 -- ? )
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! Returns if the first string lexicographically follows str2
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string-compare 0 > ;
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: string-head ( index str -- str )
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#! Returns a new string, from the beginning of the string
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#! until the given index.
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0 -rot substring ;
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: string-contains? ( substr str -- ? )
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swap index-of -1 = not ;
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: string-tail ( index str -- str )
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#! Returns a new string, from the given index until the end
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#! of the string.
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[ string-length ] keep substring ;
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: string/ ( str index -- str str )
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#! Returns 2 strings, that when concatenated yield the
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#! original string.
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[ swap string-head ] 2keep swap string-tail ;
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: string// ( str index -- str str )
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#! Returns 2 strings, that when concatenated yield the
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#! original string, without the character at the given
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#! index.
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[ swap string-head ] 2keep 1 + swap string-tail ;
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: string-head? ( str begin -- ? )
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2dup string-length< [
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2drop f
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] [
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dup string-length rot string-head =
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] ifte ;
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: ?string-head ( str begin -- str ? )
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2dup string-head? [
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string-length swap string-tail t
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] [
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drop f
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] ifte ;
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: string-tail? ( str end -- ? )
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2dup string-length< [
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2drop f
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] [
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dup string-length pick string-length swap - rot string-tail =
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] ifte ;
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: ?string-tail ( str end -- ? )
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2dup string-tail? [
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string-length swap [ string-length swap - ] keep string-head t
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] [
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drop f
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] ifte ;
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: split1 ( string split -- before after )
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2dup index-of dup -1 = [
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2drop f
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] [
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[ swap string-length + over string-tail ] keep
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rot string-head swap
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] ifte ;
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PREDICATE: integer blank " \t\n\r" string-contains? ;
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PREDICATE: integer letter CHAR: a CHAR: z between? ;
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PREDICATE: integer LETTER CHAR: A CHAR: Z between? ;
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PREDICATE: integer digit CHAR: 0 CHAR: 9 between? ;
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PREDICATE: integer printable CHAR: \s CHAR: ~ between? ;
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: quotable? ( ch -- ? )
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#! In a string literal, can this character be used without
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#! escaping?
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dup printable? swap "\"\\" string-contains? not and ;
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: url-quotable? ( ch -- ? )
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#! In a URL, can this character be used without
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#! URL-encoding?
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dup letter?
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over LETTER? or
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over digit? or
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swap "/_?." string-contains? or ;
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