add value trform trait

lib/Ernst/Interpreter/TRForm/Trait/Value.pm

@@ -0,0 +1,41 @@
+package Ernst::Interpreter::TRForm::Trait::Value;
+use Moose::Role;
+use Ernst::Interpreter::TRForm::Utils qw(simple_replace);
+
+has 'value_replacement_region' => (
+    is       => 'ro',
+    isa      => 'Str',
+    required => 1,
+    default  => sub { '//input | //textarea' },
+);
+
+around transform_attribute => sub {
+    my ($next, $self, $attribute, $fragment, $instance) = @_;
+
+    my $value = eval { $attribute->get_value($instance) };
+
+    if(defined $value){
+        $fragment = simple_replace(
+            $fragment,
+            $self->value_replacement_region,
+            'Replace' => sub {
+                my $n = shift;
+                my $copy = $n->cloneNode(1);
+
+                my $type = $n->nodeName;
+                if($type eq 'input'){
+                    $copy->setAttribute( value => $value );
+                }
+
+                else {
+                    $copy->addChild( XML::LibXML::Text->new($value) );
+                }
+
+                return $copy;
+            },
+        );
+    }
+    return $self->$next($attribute, $fragment, $instance);
+};
+
+1;

t/trform-basic.t

@@ -1,6 +1,6 @@
 use strict;
 use warnings;
-use Test::More tests => 10;
+use Test::More tests => 14;
 use Test::Exception;
 
 use ok 'Ernst::Interpreter::TRForm';
@@ -85,3 +85,33 @@ chomp(my $exact = <<HERE);
 HERE
 
 is $result, $exact, 'got exact expected HTML';
+
+
+
+$i = Ernst::Interpreter::TRForm->new_with_traits(
+    traits         => [qw/Namespace Label Instructions Value/],
+    representation => $html,
+    class          => Class->meta,
+    namespace      => '',
+);
+ok $i;
+
+my $instance = Class->new( attribute => 'foo', test => 'bar' );
+
+lives_ok {
+    $result = $i->interpret($instance);
+} 'interpret lived';
+
+ok( $result = $result->render );
+chomp($exact = <<HERE);
+<form>
+      <div id="attribute">
+          <span class="label">Attribute Label*</span>: <input type="text" value="foo" name="attribute"/></div>
+      <div id="test">
+        <p class="instructions">Fill in some test data here.</p>
+        <span class="label">Test Field*</span>:
+        <input type="text" value="bar" name="test"/></div>
+    </form>
+HERE
+
+is $result, $exact, 'got exact expected HTML';