WIP: Add gir.PartialClass

tests/sample_errors/expr_lookup_prop.err

@@ -1,3 +1,3 @@
-5,32,9,Gtk.Widget does not have a property called something
+5,32,9,Class Gtk.Widget does not have a property called something
 6,43,5,Type int does not have properties
 7,17,7,Could not find object with ID 'nothing'

tests/sample_errors/property_dne.err

@@ -1 +1 @@
-4,3,19,Class Gtk.Label does not contain a property called not-a-real-property
+4,3,19,Class Gtk.Label does not have a property called not-a-real-property

tests/samples/template_binding.blp

@@ -0,0 +1,5 @@
+using Gtk 4.0;
+
+template MyWidget {
+  label: bind MyWidget.other-label;
+}

tests/samples/template_binding.ui

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <template class="MyWidget">
+    <binding name="label">
+      <lookup name="other-label" type="MyWidget">
+        <constant>MyWidget</constant>
+      </lookup>
+    </binding>
+  </template>
+</interface>

tests/test_samples.py

@@ -90,6 +90,9 @@ class TestSamples(unittest.TestCase):
                 raise MultipleErrors(warnings)
         except PrintableError as e:
             def error_str(error):
+                if error.start is None:
+                    raise Exception("Error start/end range was never set")
+
                 line, col = utils.idx_to_pos(error.start + 1, blueprint)
                 len = error.end - error.start
                 return ",".join([str(line + 1), str(col), str(len), error.message])
@@ -157,6 +160,7 @@ class TestSamples(unittest.TestCase):
         self.assert_sample("strings")
         self.assert_sample("style")
         self.assert_sample("template")
+        self.assert_sample("template_binding")
         self.assert_sample("template_no_parent")
         self.assert_sample("translated")
         self.assert_sample("uint")