176 lines
3.2 KiB
Perl
176 lines
3.2 KiB
Perl
package preprocessor;
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use strict;
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sub new {
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my $proto = shift;
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my $class = ref($proto) || $proto;
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my $self = {};
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bless ($self, $class);
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my $state = \%{$self->{STATE}};
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my $stack = \@{$self->{STACK}};
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my $include_found = \${$self->{INCLUDE_FOUND}};
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my $conditional_found = \${$self->{CONDITIONAL_FOUND}};
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$$include_found = shift;
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$$conditional_found = shift;
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return $self;
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}
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sub include {
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my $self = shift;
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my $include_found = \${$self->{INCLUDE_FOUND}};
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my $argument = shift;
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&$$include_found($argument);
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}
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sub define {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $conditional_found = \${$self->{CONDITIONAL_FOUND}};
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my $name = shift;
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$$state{$name} = "def";
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&$$conditional_found($name);
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}
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sub undefine {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $conditional_found = \${$self->{CONDITIONAL_FOUND}};
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my $name = shift;
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$$state{$name} = "undef";
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&$$conditional_found($name);
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}
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sub begin_if {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $stack = \@{$self->{STACK}};
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my $directive = shift;
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local $_ = shift;
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while(!/^$/) {
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if(/^0\s*\&\&/) {
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$_ = "0";
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} elsif(/^1\s*\|\|/) {
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$_ = "1";
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}
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if(/^(!)?defined\s*\(\s*(.+?)\s*\)\s*((\&\&|\|\|)\s*)?/){
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$_ = $';
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if(defined($1) && $1 eq "!") {
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$self->undefine($2);
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push @$stack, $2;
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} else {
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$self->define($2);
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push @$stack, $2;
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}
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} elsif(/^(\w+)\s*(<|<=|==|!=|>=|>)\s*(\w+)\s*((\&\&|\|\|)\s*)?/) {
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$_ = $';
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} elsif(/^(!)?(\w+)\s*$/) {
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$_ = $';
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} elsif(/^\(|\)/) {
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$_ = $';
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} else {
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print "*** Can't parse '#$directive $_' ***\n";
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$_ = "";
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}
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}
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}
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sub else_if {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $stack = \@{$self->{STACK}};
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my $argument = shift;
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$self->end_if;
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if(defined($argument)) {
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$self->begin_if("elif", $argument);
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}
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}
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sub end_if {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $stack = \@{$self->{STACK}};
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my $macro = pop @$stack;
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delete $$state{$macro} if defined($macro);
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}
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sub directive {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $stack = \@{$self->{STACK}};
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my $directive = shift;
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my $argument = shift;
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local $_ = $directive;
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if(/^if$/) {
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$self->begin_if("if",$argument);
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} elsif(/^ifdef$/) {
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$self->begin_if("if", "defined($argument)");
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} elsif(/^ifndef$/) {
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$self->begin_if("if", "!defined($argument)");
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push @$stack, $argument;
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} elsif(/^elif$/) {
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$self->else_if($argument);
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} elsif(/^else$/) {
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$self->else_if;
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} elsif(/^endif$/) {
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$self->end_if;
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} elsif(/^include/) {
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$self->include($argument);
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}
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}
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sub is_def {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $name = shift;
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my $status = $$state{$name};
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return defined($status) && $status eq "def";
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}
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sub is_undef {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $name = shift;
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my $status = $$state{$name};
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return defined($status) && $status eq "undef";
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}
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sub is_unknown {
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my $self = shift;
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my $state = \%{$self->{STATE}};
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my $name = shift;
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my $status = $$state{$name};
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return !defined($status);
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}
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1;
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