51 lines
1.3 KiB
Factor
51 lines
1.3 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
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USING: generic kernel kernel-internals lists math sequences ;
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! Strings
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DEFER: string?
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BUILTIN: string 12 string? [ 1 length f ] [ 2 hashcode f ] ;
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M: string =
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over string? [
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over hashcode over hashcode number= [
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string-compare 0 eq?
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] [
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2drop f
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] ifte
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] [
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2drop f
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] ifte ;
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M: string nth ( n str -- ch )
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bounds-check char-slot ;
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GENERIC: >string ( seq -- string )
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M: string >string ;
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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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! Characters
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PREDICATE: integer blank " \t\n\r" 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 "\"\\" 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 "/_?." contains? or ;
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