factor/core/strings/strings.factor

! Copyright (C) 2003, 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel math.private sequences kernel.private
math sequences.private slots.private byte-arrays
alien.accessors ;
IN: strings

<PRIVATE

: string-hashcode 3 slot ; inline

: set-string-hashcode 3 set-slot ; inline

: reset-string-hashcode f swap set-string-hashcode ; inline

: rehash-string ( str -- )
    1 over sequence-hashcode swap set-string-hashcode ; inline

PRIVATE>

M: string equal?
    over string? [
        over hashcode over hashcode number=
        [ sequence= ] [ 2drop f ] if
    ] [
        2drop f
    ] if ;

M: string hashcode*
    nip dup string-hashcode [ ]
    [ dup rehash-string string-hashcode ] ?if ;

M: string nth-unsafe
    >r >fixnum r> string-nth ;

M: string set-nth-unsafe
    dup reset-string-hashcode
    >r >fixnum >r >fixnum r> r> set-string-nth ;

M: string clone
    (clone) dup string-aux clone over set-string-aux ;

M: string resize resize-string ;

: 1string ( ch -- str ) 1 swap <string> ;

: >string ( seq -- str ) "" clone-like ;

M: string new-sequence drop 0 <string> ;

INSTANCE: string sequence