Sweden-Number/tools/winapi_check/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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
package preprocessor;
use strict;
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 $_ = shift;
while(!/^$/) {
if(/^0\s*\&\&/) {
$_ = "0";
} elsif(/^1\s*\|\|/) {
$_ = "1";
}
if(/^(!)?defined\s*\(\s*(.+?)\s*\)\s*((\&\&|\|\|)\s*)?/){
$_ = $';
if(defined($1) && $1 eq "!") {
$self->undefine($2);
push @$stack, $2;
} else {
$self->define($2);
push @$stack, $2;
}
} elsif(/^(\w+)\s*(<|<=|==|!=|>=|>)\s*(\w+)\s*((\&\&|\|\|)\s*)?/) {
$_ = $';
} elsif(/^(!)?(\w+)\s*$/) {
$_ = $';
} elsif(/^\(|\)/) {
$_ = $';
} else {
print "*** Can't parse '#$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;