Add compilation tests

Added a set of test inputs and expected outputs, for regression testing.

tests/samples/binding.blp

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+using Gtk 4.0;
+
+Box {
+  visible: bind box2.visible sync-create;
+}
+
+Box box2 {}

tests/samples/binding.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkBox">
+    <property name="visible" bind-source="box2" bind-property="visible" bind-flags="sync-create"/>
+  </object>
+  <object class="GtkBox" id="box2"></object>
+</interface>

tests/samples/child_type.blp

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+using Gtk 4.0;
+
+Window {
+  [titlebar]
+  HeaderBar {
+  }
+}

tests/samples/child_type.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkWindow">
+    <child type="titlebar">
+      <object class="GtkHeaderBar"></object>
+    </child>
+  </object>
+</interface>

tests/samples/layout.blp

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+using Gtk 4.0;
+
+Grid {
+  Label {
+    layout {
+      column: 0;
+      row: 1;
+    }
+  }
+}

tests/samples/layout.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkGrid">
+    <child>
+      <object class="GtkLabel">
+        <layout>
+          <property name="column">0</property>
+          <property name="row">1</property>
+        </layout>
+      </object>
+    </child>
+  </object>
+</interface>

tests/samples/menu.blp

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+using Gtk 4.0;
+
+menu {
+  label: _("menu label");
+  test-custom-attribute: 3.1415;
+
+  submenu {
+    section {
+      label: "test section";
+    }
+
+    item {
+      label: "test item";
+    }
+
+    item "test item shorthand 1";
+    item "test item shorthand 2" "app.test-action";
+    item "test item shorthand 3" "app.test-action" "test-symbolic";
+  }
+}

tests/samples/menu.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <menu>
+    <attribute name="label" translatable="yes">menu label</attribute>
+    <attribute name="test-custom-attribute">3.1415</attribute>
+    <submenu>
+      <section>
+        <attribute name="label">test section</attribute>
+      </section>
+      <item>
+        <attribute name="label">test item</attribute>
+      </item>
+      <item>
+        <attribute name="label">test item shorthand 1</attribute>
+      </item>
+      <item>
+        <attribute name="label">test item shorthand 2</attribute>
+        <attribute name="action">app.test-action</attribute>
+      </item>
+      <item>
+        <attribute name="label">test item shorthand 3</attribute>
+        <attribute name="action">app.test-action</attribute>
+        <attribute name="icon">test-symbolic</attribute>
+      </item>
+    </submenu>
+  </menu>
+</interface>

tests/samples/property.blp

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+using Gtk 4.0;
+
+Box {
+  orientation: VERTICAL;
+}

tests/samples/property.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkBox">
+    <property name="orientation">VERTICAL</property>
+  </object>
+</interface>

tests/samples/signal.blp

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+using Gtk 4.0;
+
+Button {
+  clicked => on_button_clicked() swapped;
+  notify::visible => on_button_notify_visible();
+}

tests/samples/signal.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkButton">
+    <signal name="clicked" handler="on_button_clicked" swapped="true"/>
+    <signal name="notify::visible" handler="on_button_notify_visible"/>
+  </object>
+</interface>

tests/samples/style.blp

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+using Gtk 4.0;
+
+Label {
+  style "class-1", "class-2";
+}

tests/samples/style.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkLabel">
+    <style>
+      <class name="class-1"/>
+      <class name="class-2"/>
+    </style>
+  </object>
+</interface>

tests/samples/template.blp

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+using Gtk 4.0;
+
+template TestTemplate : ApplicationWindow {}

tests/samples/template.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <template class="TestTemplate" parent="GtkApplicationWindow"></template>
+</interface>

tests/samples/using.blp

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+using Gtk 4.0;
+using GObject 2.0;
+
+GObject.Object {}

tests/samples/using.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GObject"></object>
+</interface>

tests/test_samples.py

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+# test_samples.py
+#
+# Copyright 2021 James Westman <james@jwestman.net>
+#
+# This file 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 3 of the
+# License, or (at your option) any later version.
+#
+# This file 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 program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+
+import difflib # I love Python
+from pathlib import Path
+import unittest
+
+from gtkblueprinttool import tokenizer, parser
+from gtkblueprinttool.errors import PrintableError
+from gtkblueprinttool.tokenizer import Token, TokenType, tokenize
+
+
+class TestSamples(unittest.TestCase):
+    def assert_sample(self, name):
+        with open((Path(__file__).parent / f"samples/{name}.blp").resolve()) as f:
+            blueprint = f.read()
+        with open((Path(__file__).parent / f"samples/{name}.ui").resolve()) as f:
+            expected = f.read()
+
+        tokens = tokenizer.tokenize(blueprint)
+        ast, errors = parser.parse(tokens)
+
+        if errors:
+            raise errors
+        if len(ast.errors):
+            raise MultipleErrors(ast.errors)
+
+        actual = ast.generate()
+        if actual.strip() != expected.strip():
+            diff = difflib.unified_diff(expected.splitlines(), actual.splitlines())
+            print("\n".join(diff))
+            raise AssertionError()
+
+
+    def test_samples(self):
+        self.assert_sample("binding")
+        self.assert_sample("child_type")
+        self.assert_sample("layout")
+        self.assert_sample("menu")
+        self.assert_sample("property")
+        self.assert_sample("signal")
+        self.assert_sample("style")
+        self.assert_sample("template")
+        self.assert_sample("using")