factor/library/sbuf.factor

! :folding=indent:collapseFolds=0:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
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IN: strings
USE: arithmetic
USE: combinators
USE: kernel
USE: namespaces
USE: strings
USE: stack

: string-buffer-size 80 ;

: <% ( -- )
    #! Begins constructing a string.
    <namespace> >n string-buffer-size <sbuf>
    "string-buffer" set ;

: % ( str -- )
    #! Append a string to the construction buffer.
    "string-buffer" get sbuf-append ;

: %> ( -- str )
    #! Ends construction and pushes the constructed text on the
    #! stack.
    "string-buffer" get sbuf>str n> drop ;

: fill ( count char -- string )
    #! Push a string that consists of the same character
    #! repeated.
    <% swap [ dup % ] times drop %> ;

: str-map ( str code -- str )
    #! Apply a quotation to each character in the string, and
    #! push a new string constructed from return values.
    #! The quotation must have stack effect ( X -- X ).
    <% swap [ swap dup >r call % r> ] str-each drop %> ;