1 files changed, 173 insertions, 0 deletions
diff --git a/lib/Module/CPANfile/Environment.pm b/lib/Module/CPANfile/Environment.pm
new file mode 100644
index 0000000..e1c0ea1
--- /dev/null
+++ b/lib/Module/CPANfile/Environment.pm
@@ -0,0 +1,173 @@
+package Module::CPANfile::Environment;
+use strict;
+use warnings;
+use Module::CPANfile::Prereqs;
+use Carp ();
+
+my @bindings = qw(
+    on requires recommends suggests conflicts
+    feature
+    osname
+    mirror
+    configure_requires build_requires test_requires author_requires
+);
+
+my $file_id = 1;
+
+sub new {
+    my($class, $file) = @_;
+    bless {
+        file     => $file,
+        phase    => 'runtime', # default phase
+        feature  => undef,
+        features => {},
+        prereqs  => Module::CPANfile::Prereqs->new,
+        mirrors  => [],
+    }, $class;
+}
+
+sub bind {
+    my $self = shift;
+    my $pkg = caller;
+
+    for my $binding (@bindings) {
+        no strict 'refs';
+        *{"$pkg\::$binding"} = sub { $self->$binding(@_) };
+    }
+}
+
+sub parse {
+    my($self, $code) = @_;
+
+    my $err;
+    {
+        local $@;
+        $file_id++;
+        $self->_evaluate(<<EVAL);
+package Module::CPANfile::Sandbox$file_id;
+no warnings;
+BEGIN { \$_environment->bind }
+
+# line 1 "$self->{file}"
+$code;
+EVAL
+        $err = $@;
+    }
+
+    if ($err) { die "Parsing $self->{file} failed: $err" };
+
+    return 1;
+}
+
+sub _evaluate {
+    my $_environment = $_[0];
+    eval $_[1];
+}
+
+sub prereqs { $_[0]->{prereqs} }
+
+sub mirrors { $_[0]->{mirrors} }
+
+# DSL goes from here
+
+sub on {
+    my($self, $phase, $code) = @_;
+    local $self->{phase} = $phase;
+    $code->();
+}
+
+sub feature {
+    my($self, $identifier, $description, $code) = @_;
+
+    # shortcut: feature identifier => sub { ... }
+    if (@_ == 3 && ref($description) eq 'CODE') {
+        $code = $description;
+        $description = $identifier;
+    }
+
+    unless (ref $description eq '' && ref $code eq 'CODE') {
+        Carp::croak("Usage: feature 'identifier', 'Description' => sub { ... }");
+    }
+
+    local $self->{feature} = $identifier;
+    $self->prereqs->add_feature($identifier, $description);
+
+    $code->();
+}
+
+sub osname { die "TODO" }
+
+sub mirror {
+    my($self, $url) = @_;
+    push @{$self->{mirrors}}, $url;
+}
+
+sub requirement_for {
+    my($self, $module, @args) = @_;
+
+    my $requirement = 0;
+    $requirement = shift @args if @args % 2;
+
+    return Module::CPANfile::Requirement->new(
+        name    => $module,
+        version => $requirement,
+        @args,
+    );
+}
+
+sub requires {
+    my $self = shift;
+    $self->add_prereq(requires => @_);
+}
+
+sub recommends {
+    my $self = shift;
+    $self->add_prereq(recommends => @_);
+}
+
+sub suggests {
+    my $self = shift;
+    $self->add_prereq(suggests => @_);
+}
+
+sub conflicts {
+    my $self = shift;
+    $self->add_prereq(conflicts => @_);
+}
+
+sub add_prereq {
+    my($self, $type, $module, @args) = @_;
+
+    $self->prereqs->add_prereq(
+        feature => $self->{feature},
+        phase   => $self->{phase},
+        type    => $type,
+        module  => $module,
+        requirement => $self->requirement_for($module, @args),
+    );
+}
+
+# Module::Install compatible shortcuts
+
+sub configure_requires {
+    my($self, @args) = @_;
+    $self->on(configure => sub { $self->requires(@args) });
+}
+
+sub build_requires {
+    my($self, @args) = @_;
+    $self->on(build => sub { $self->requires(@args) });
+}
+
+sub test_requires {
+    my($self, @args) = @_;
+    $self->on(test => sub { $self->requires(@args) });
+}
+
+sub author_requires {
+    my($self, @args) = @_;
+    $self->on(develop => sub { $self->requires(@args) });
+}
+
+1;
+