parsedto.fs

\ -> (to/is replacement) recognizer

\ Copyright (C) 2012,2013,2014,2015,2016 Free Software Foundation, Inc.

\ This file is part of Gforth.

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\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.

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\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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' (int-to) ' (comp-to) ' lit, recognizer r:to

: rec:to ( addr u -- xt r:to | r:fail )
    \G words prefixed with @code{->} are treated as if preceeded by
    \G @code{TO} or @code{IS}
    dup 3 u< IF  2drop r:fail  EXIT  THEN
    over 1+ c@ '>' <> IF  2drop r:fail  EXIT  THEN
    case  over c@
	'-' of   0 to-style# !  endof
	'+' of   1 to-style# !  endof
	''' of  -1 to-style# !  endof
	drop 2drop r:fail  EXIT
    endcase
    2 /string recognize dup r:fail = IF  to-style# off  EXIT  THEN
    name?int r:to ;

' rec:to get-recognizers 1+ set-recognizers