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|
-- This file is part of SmartEiffel The GNU Eiffel Compiler Tools and Libraries
--
-- SmartEiffel is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License, as published by the
-- Free Software Foundation; either version 2, or (at your option) any later
-- version.
-- SmartEiffel is distributed in the hope that it will be useful but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
-- more details. You should have received a copy of the GNU General Public
-- License along with SmartEiffel; see the file COPYING. If not, write to
-- the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-- MA 02111-1307, USA.
--
-- Copyright(C) 1994-2002: INRIA - LORIA (INRIA Lorraine) - ESIAL U.H.P.
-- - University of Nancy 1 - FRANCE
-- Copyright(C) 2003: INRIA - LORIA (INRIA Lorraine) - I.U.T. Charlemagne
-- - University of Nancy 2 - FRANCE
--
-- Dominique COLNET, Suzanne COLLIN, Olivier ZENDRA,
-- Philippe RIBET, Cyril ADRIAN
--
-- http://SmartEiffel.loria.fr - SmartEiffel@loria.fr
--
class LOOP_VARIANT
--
-- For the variant part of a loop instruction.
--
inherit GLOBALS
creation make
feature {LOOP_VARIANT_VISITOR}
accept(visitor: LOOP_VARIANT_VISITOR) is
do
visitor.visit_loop_variant(Current)
end
feature
comment1: COMMENT
-- if any the one after the %"variant%" keyword.
tag: TAG_NAME
-- if any, the optional tag name.
comment2: COMMENT
expression: EXPRESSION
-- the variant INTEGER expression.
start_position: POSITION is
do
if tag /= Void then
Result := tag.start_position
else
Result := expression.start_position
end
end
feature {E_LOOP}
verify_scoop(allowed: FORMAL_ARG_LIST) is
local
dummy: BOOLEAN
do
dummy := expression.verify_scoop(allowed)
end
frozen use_current: BOOLEAN is
do
Result := expression.use_current
end
pretty_print is
do
if comment1 /= Void then
comment1.pretty_print
else
pretty_printer.indent
end
if tag /= Void then
pretty_printer.put_string(tag.to_string)
pretty_printer.put_string(": ")
end
if comment2 /= Void then
comment2.pretty_print
else
pretty_printer.indent
end
expression.pretty_print
end
frozen afd_check is
do
expression.afd_check
end
feature {E_LOOP, LOOP_VARIANT}
frozen to_runnable(ct: E_TYPE): like Current is
local
e: like expression
do
if current_type = Void then
current_type := ct
e := expression.to_runnable(ct)
if e = Void then
error(start_position,"Bad loop variant.")
else
expression := e
if not expression.result_type.is_integer then
error(expression.start_position,
"Expression of variant must be INTEGER.")
end
end
if nb_errors = 0 then
Result := Current
end
else
!!Result.make(comment1,tag,comment2,expression)
Result := Result.to_runnable(ct)
end
end
feature {NONE}
current_type: E_TYPE
-- Non Void when checked in.
make(c1: COMMENT; t: like tag; c2: COMMENT exp: like expression) is
require
exp /= Void
do
comment1 := c1
tag := t
comment2 := c2
expression := exp
ensure
comment1 = c1
tag = t
comment2 = c2
expression = exp
end
invariant
expression /= Void
end -- LOOP_VARIANT
|
