118 lines
3.1 KiB
Factor
118 lines
3.1 KiB
Factor
! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: parser
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USE: arithmetic
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USE: combinators
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USE: errors
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USE: kernel
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USE: lists
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USE: logic
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USE: namespaces
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USE: stack
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USE: strings
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USE: words
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USE: unparser
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! Number parsing
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: not-a-number "Not a number" throw ;
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: digit> ( ch -- n )
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[
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[ digit? ] [ CHAR: 0 - ]
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[ letter? ] [ CHAR: a - 10 + ]
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[ LETTER? ] [ CHAR: A - 10 + ]
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[ drop t ] [ not-a-number ]
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] cond ;
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: >digit ( n -- ch )
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dup 10 < [ CHAR: 0 + ] [ 10 - CHAR: a + ] ifte ;
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: digit ( num digit -- num )
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"base" get swap 2dup > [
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>r * r> +
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] [
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not-a-number
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] ifte ;
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: (str>integer) ( str -- num )
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dup str-length 0 = [
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not-a-number
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] [
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0 swap [ digit> digit ] str-each
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] ifte ;
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: str>integer ( str -- num )
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#! Parse a string representation of an integer.
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dup str-length 0 = [
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drop not-a-number
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] [
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dup "-" str-head? dup [
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nip (str>integer) neg
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] [
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drop (str>integer)
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] ifte
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] ifte ;
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: str>ratio ( str -- num )
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dup CHAR: / index-of str//
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swap str>integer swap str>integer / ;
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: str>number ( str -- num )
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#! Affected by "base" variable.
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[
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[ "/" swap str-contains? ] [ str>ratio ]
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[ "." swap str-contains? ] [ str>float ]
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[ drop t ] [ str>integer ]
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] cond ;
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: base> ( str base -- num/f )
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[
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"base" set
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[ str>number ] [ [ drop f ] when ] catch
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] with-scope ;
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: bin> ( str -- num )
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#! Convert a binary string to a number.
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2 base> ;
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: oct> ( str -- num )
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#! Convert an octal string to a number.
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8 base> ;
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: dec> ( str -- num )
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#! Convert a decimal string to a number.
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10 base> ;
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: hex> ( str -- num )
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#! Convert a hexadecimal string to a number.
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16 base> ;
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! Something really sucks about these words here
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: parse-number ( str -- num ) dec> ;
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