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ifthenelse.e
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1999-06-05
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-- This file is part of SmallEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
-- Dominique COLNET and Suzanne COLLIN - colnet@loria.fr
-- http://SmallEiffel.loria.fr
-- SmallEiffel 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. SmallEiffel 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 SmallEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class IFTHENELSE
--
-- The conditionnal instruction : "if ... then ... elseif ... else ... end".
--
inherit INSTRUCTION; IF_GLOBALS;
creation make
feature
start_position: POSITION;
-- Of keyword "if".
ifthenlist: IFTHENLIST;
else_compound: COMPOUND;
-- Not Void if any.
feature {NONE}
current_type: TYPE;
feature {NONE}
make(sp: like start_position) is
do
start_position := sp;
end;
feature
is_pre_computable: BOOLEAN is false;
end_mark_comment: BOOLEAN is true;
feature
use_current: BOOLEAN is
do
if ifthenlist.use_current then
Result := true;
elseif else_compound /= Void then
Result := else_compound.use_current;
end;
end;
afd_check is
do
ifthenlist.afd_check;
if else_compound /= Void then
else_compound.afd_check;
end;
end;
collect_c_tmp is
do
ifthenlist.collect_c_tmp;
end;
compile_to_c is
local
static_value: INTEGER;
do
check
ifthenlist.count > 0
end;
cpp.put_string("/*[IF*/%N");
static_value := ifthenlist.compile_to_c;
inspect
static_value
when static_false then
cpp.put_string("/*AE*/%N");
if else_compound /= Void then
else_compound.compile_to_c;
end;
when static_true then
when non_static then
if else_compound /= Void then
cpp.put_string(fz_else);
cpp.put_string(fz_11);
else_compound.compile_to_c;
cpp.put_string(fz_12);
end;
end;
cpp.put_string("/*FI]*/%N");
end;
compile_to_jvm is
local
static_value: INTEGER;
do
check
ifthenlist.count > 0
end;
static_value := ifthenlist.compile_to_jvm;
inspect
static_value
when static_false then
-- Always else :
if else_compound /= Void then
else_compound.compile_to_jvm;
end;
when static_true then
-- Never else :
ifthenlist.compile_to_jvm_resolve_branch;
when non_static then
-- Else is possible :
if else_compound /= Void then
else_compound.compile_to_jvm;
end;
ifthenlist.compile_to_jvm_resolve_branch;
end;
end;
to_runnable(ct: TYPE): like Current is
local
ne: INTEGER;
itl: like ifthenlist;
ec: like else_compound;
do
ne := nb_errors;
if current_type = Void then
current_type := ct;
itl := ifthenlist.to_runnable(ct);
if itl = Void then
check
nb_errors - ne > 0
end;
else
ifthenlist := itl;
end;
if nb_errors - ne = 0 and then else_compound /= Void then
ec := else_compound.to_runnable(ct);
if ec = Void then
check
nb_errors - ne > 0
end;
else
else_compound := ec;
end;
end;
if itl /= Void then
Result := Current
end;
else
Result := twin;
Result.clear_current_type;
Result := Result.to_runnable(ct);
end;
end;
add_if_then(expression: EXPRESSION; then_compound: COMPOUND) is
require
expression /= void;
local
ifthen: IFTHEN;
do
!!ifthen.make(expression,then_compound);
if ifthenlist = Void then
!!ifthenlist.make(<<ifthen>>);
else
ifthenlist.add_last(ifthen);
end;
end;
pretty_print is
do
check
ifthenlist.count > 0;
end;
fmt.keyword("if");
ifthenlist.pretty_print;
if else_compound /= Void then
fmt.indent;
fmt.keyword("else");
else_compound.pretty_print;
end;
fmt.indent;
if fmt.semi_colon_flag then
fmt.keyword("end;");
else
fmt.keyword("end");
end;
if fmt.print_end_if then
fmt.put_end("if");
end;
end;
feature {IFTHENELSE}
clear_current_type is
do
current_type := Void;
ensure
current_type = Void
end;
feature {EIFFEL_PARSER}
set_else_compound(ec: like else_compound) is
do
else_compound := ec;
ensure
else_compound = ec;
end;
end -- IFTHENELSE