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; VL 2014 -- VL Verilog Toolkit, 2014 Edition
; Copyright (C) 2008-2015 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.com/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original author: Jared Davis <jared@centtech.com>
(in-package "VL2014")
(include-book "expressions")
(include-book "../../parsetree")
(local (include-book "../../util/arithmetic"))
; Dimensions and ranges are introduced with the following rules.
;
; dimension ::= '[' dimension_constant_expression ':' dimension_constant_expression ']'
;
; range ::= '[' msb_constant_expression ':' lsb_constant_expression ']'
;
; But these are all just aliases to constant_expression, which we treat as
; regular expressions. Note also that the names above in "range" are
; misleading, since no particular order is required. Moreover, we do not make
; any distinction between dimensions and ranges. That is, in either case, we
; call vl-parse-range and produce vl-range-p objects.
(defparser vl-parse-range ()
:result (vl-range-p val)
:resultp-of-nil nil
:fails gracefully
:count strong
(seq tokstream
(:= (vl-match-token :vl-lbrack))
(msb := (vl-parse-expression))
(:= (vl-match-token :vl-colon))
(lsb := (vl-parse-expression))
(:= (vl-match-token :vl-rbrack))
(return (make-vl-range :msb msb
:lsb lsb))))
(defparser vl-parse-0+-ranges ()
;; Note: assumes brackets denote subsequent ranges to be matched, and as a
;; result it may indeed cause an error.
:result (vl-rangelist-p val)
:resultp-of-nil t
:true-listp t
:fails gracefully
:count strong-on-value
(seq tokstream
(unless (vl-is-token? :vl-lbrack)
(return nil))
(first := (vl-parse-range))
(rest := (vl-parse-0+-ranges))
(return (cons first rest))))
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