Sweden-Number/tools/winapi/preprocessor.pm

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#
# Copyright 1999, 2000, 2001 Patrik Stridvall
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#
package preprocessor;
use strict;
use warnings 'all';
sub new($) {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {};
bless ($self, $class);
my $state = \%{$self->{STATE}};
my $stack = \@{$self->{STACK}};
my $include_found = \${$self->{INCLUDE_FOUND}};
my $conditional_found = \${$self->{CONDITIONAL_FOUND}};
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$$include_found = shift;
$$conditional_found = shift;
return $self;
}
sub include($$) {
my $self = shift;
my $include_found = \${$self->{INCLUDE_FOUND}};
my $argument = shift;
&$$include_found($argument);
}
sub define($$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $conditional_found = \${$self->{CONDITIONAL_FOUND}};
my $name = shift;
$$state{$name} = "def";
&$$conditional_found($name);
}
sub undefine($$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $conditional_found = \${$self->{CONDITIONAL_FOUND}};
my $name = shift;
$$state{$name} = "undef";
&$$conditional_found($name);
}
sub begin_if($$$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $stack = \@{$self->{STACK}};
my $directive = shift;
local $_ = shift;
while(!/^$/) {
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if(/^0\s*\&\&/s) {
$_ = "0";
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} elsif(/^1\s*\|\|/s) {
$_ = "1";
}
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if (/^(!\s*)?defined\s*\(\s*(\w+)\s*\)\s*(?:(\&\&|\|\|)\s*)?/s ||
/^(!\s*)?defined\s*(\w+)\s*(?:(\&\&|\|\|)\s*)?/s)
{
$_ = $';
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my $sign = $1;
my $var = $2;
if (defined($sign) && $sign eq "!") {
$self->undefine($var);
push @$stack, $var;
} else {
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$self->define($var);
push @$stack, $var;
}
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} elsif (/^(!\s*)?(\w+)\s*(?:(<|<=|==|!=|>=|>|\+|\-|\*\/)\s*(\w+)\s*)?(?:(\&\&|\|\|)\s*)?/s) {
$_ = $';
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my $sign = $1;
my $var = $2;
if (defined($sign) && $sign eq "!") {
$self->undefine($var);
push @$stack, $var;
} else {
$self->define($var);
push @$stack, $var;
}
} elsif(/^(!\s*)?\(/s) {
$_ = "";
} else {
print "*** Can't parse '#$directive $_' ***\n";
$_ = "";
}
}
}
sub else_if($$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $stack = \@{$self->{STACK}};
my $argument = shift;
$self->end_if;
if(defined($argument)) {
$self->begin_if("elif", $argument);
}
}
sub end_if($) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $stack = \@{$self->{STACK}};
my $macro = pop @$stack;
delete $$state{$macro} if defined($macro);
}
sub directive($$$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $stack = \@{$self->{STACK}};
my $directive = shift;
my $argument = shift;
local $_ = $directive;
if(/^if$/) {
$self->begin_if("if",$argument);
} elsif(/^ifdef$/) {
$self->begin_if("if", "defined($argument)");
} elsif(/^ifndef$/) {
$self->begin_if("if", "!defined($argument)");
push @$stack, $argument;
} elsif(/^elif$/) {
$self->else_if($argument);
} elsif(/^else$/) {
$self->else_if;
} elsif(/^endif$/) {
$self->end_if;
} elsif(/^include/) {
$self->include($argument);
}
}
sub is_def($$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $name = shift;
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my $status = $$state{$name};
return defined($status) && $status eq "def";
}
sub is_undef($$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $name = shift;
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my $status = $$state{$name};
return defined($status) && $status eq "undef";
}
sub is_unknown($$) {
my $self = shift;
my $state = \%{$self->{STATE}};
my $name = shift;
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my $status = $$state{$name};
return !defined($status);
}
1;