factor/library/interpreter.factor

! :folding=indent:collapseFolds=1:

! $Id$
!
! Copyright (C) 2003, 2004 Slava Pestov.
! 
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions are met:
! 
! 1. Redistributions of source code must retain the above copyright notice,
!    this list of conditions and the following disclaimer.
! 
! 2. Redistributions in binary form must reproduce the above copyright notice,
!    this list of conditions and the following disclaimer in the documentation
!    and/or other materials provided with the distribution.
! 
! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

IN: interpreter
USE: arithmetic
USE: combinators
USE: continuations
USE: kernel
USE: lists
USE: logic
USE: namespaces
USE: parser
USE: stack
USE: stdio
USE: strings
USE: styles
USE: words
USE: unparser
USE: vectors

: print-banner ( -- )
    <% "This is " % java? [ "JVM " % ] when
    native? [ "native " % ] when "Factor " % version % %> print
    "Copyright (C) 2003, 2004 Slava Pestov" print
    "Copyright (C) 2004 Chris Double" print
    "Type ``exit'' to exit, ``help'' for help." print ;

: init-history ( -- )
    64 <vector> "history" set ;

: history+ ( cmd -- )
    "history" get vector-push ;

: print-numbered-entry ( index vector -- )
    <% over unparse % ": " % vector-nth % %> print ;

: print-numbered-vector ( list -- )
    dup vector-length [ over print-numbered-entry ] times* drop ;

: history. ( -- )
    "X redo    -- evaluate the expression with number X." print
    "X re-edit -- edit the expression with number X." print
    "history" get print-numbered-vector ;

: get-history ( index -- )
    "history" get vector-nth ;

: redo ( index -- )
    get-history dup "  ( " write write " )" print eval ;

: re-edit ( index -- )
    get-history edit ;

: history# ( -- number )
    "history" get vector-length ;

: print-prompt ( -- )
    <% "  ( " % history# unparse % " )" % %>
    [ "prompt" ] get-style write-attr
    ! Print the space without a style, to workaround a bug in
    ! the GUI listener where the style from the prompt carries
    ! over to the input
    " " write
    flush ;

: exit ( -- )
    "quit-flag" on ;

: interpret ( -- )
    print-prompt read dup [
        dup history+ eval
    ] [
        drop exit
    ] ifte ;

: interpreter-loop ( -- )
    [ "quit-flag" get not ] [ interpret ] while
    "quit-flag" off ;

: room. ( -- )
    room
    1024 /i unparse write " KB total, " write
    1024 /i unparse write " KB free" print ;

: help ( -- )
    "SESSION:" print
    native? [
        "\"foo.image\" save-image   -- save heap to a file" print
    ] when
    "history.                 -- show previous commands" print
    "room.                    -- show memory usage" print
    "garbage-collection       -- force a GC" print
    "exit                     -- exit interpreter" print
    terpri
    "WORDS:" print
    "vocabs.                  -- list vocabularies" print 
    "\"math\" words.            -- list the math vocabulary" print
    "\"neg\" see                -- show word definition" print
    "\"str\" apropos.           -- list all words containing str" print
    "\"car\" usages.            -- list all words invoking car" print
    terpri
    "STACKS:" print
    ".s .r .n .c              -- show contents of the 4 stacks" print
    "clear                    -- clear datastack" print
    terpri
    "OBJECTS:" print
    "global describe          -- list global variables." print
    "\"foo\" get .              -- print a variable value." print
    ".                        -- print top of stack." print
    terpri
    "HTTP SERVER:             USE: httpd 8888 httpd" print
    "TELNET SERVER:           USE: telnetd 9999 telnetd" print ;