Add a formatter

tests/formatting/correct1.blp

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+using Gtk 4.0;
+using Adw 1;
+
+template $MyTemplate: Label {
+  /**
+   * A list of strings.
+   */
+  StringList {
+    // comment
+    strings [
+      "Hello",
+      C_("Greeting", "World"),
+    ]
+  }
+
+  object: Button {
+    label: "Click me";
+  };
+
+  flags: a | b;
+
+  [child]
+  Label {
+  }
+
+  [child]
+  Label label2 {
+  }
+
+  // Single line comment.
+
+  /**
+   * Multiline comment.
+   */
+  // Single line comment.
+  value: bind 1.0 as <double>;
+  as: 1;
+  signal => $on_signal() after;
+}
+
+Dialog {
+  [action response=ok]
+  $MyButton {
+  }
+}
+
+menu menu {
+  item ("test")
+
+  item {
+    label: "test";
+  }
+
+  item ("test")
+}
+
+Adw.MessageDialog {
+  responses [
+    save: "Save" suggested disabled,
+  ]
+}
+
+Adw.Breakpoint {
+  condition ("width < 100")
+
+  setters {
+    label2.label: _("Hello, world!");
+    label2.visible: false;
+    label2.extra-menu: null;
+  }
+}

tests/formatting/in1.blp

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+using Gtk 4.0;using Adw 1;Overlay{Label label{label:_("'Hello World!' \"\n\t\"");}[overlay]Button{notify::icon-name=>$on_icon_name_changed(label)swapped;styles["destructive"]}visible:bind $isVisible(label.visible,my-menu)as<bool>;width-request:bind label.width-request no-sync-create;}menu my-menu{item(_("Label"), "action-name", "icon-name")item{action:"win.format";}}

tests/formatting/in2.blp

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+using Gtk 4.0;
+
+    using Adw 1;
+
+Overlay {
+
+Label
+label
+{
+label
+:
+_
+(
+"'Hello World!' \"\n\t\""
+)
+;
+}
+[
+    overlay
+] Button
+{ notify
+:: icon-name
+=> $ on_icon_name_changed ( label )
+swapped ;
+styles
+[ "destructive" ]
+}
+visible
+: bind $ isVisible ( label.visible ,
+my-menu ) as
+ < bool > ; width-request : bind label . width-request no-sync-create ; }
+                menu my-menu
+{ item ( _ ( "Label" ) , "action-name" , "icon-name" ) item { action : "win.format" ; } }
+
+
+
+
+
+
+

tests/formatting/out.blp

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+using Gtk 4.0;
+using Adw 1;
+
+Overlay {
+  Label label {
+    label: _("'Hello World!' \"\n\t\"");
+  }
+
+  [overlay]
+  Button {
+    notify::icon-name => $on_icon_name_changed(label) swapped;
+
+    styles [
+      "destructive"
+    ]
+  }
+
+  visible: bind $isVisible(label.visible, my-menu) as <bool>;
+  width-request: bind label.width-request no-sync-create;
+}
+
+menu my-menu {
+  item (_("Label"), "action-name", "icon-name")
+
+  item {
+    action: "win.format";
+  }
+}

tests/formatting/string_in.blp

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+using Gtk 4.0;
+
+Label {
+  label: "\"'\'\t\n\\'";
+}

tests/formatting/string_out.blp

@@ -0,0 +1,5 @@
+using Gtk 4.0;
+
+Label {
+  label: "\"'\'\t\n\\'";
+}

tests/test_formatter.py

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+# test_formatter.py
+#
+# Copyright 2023 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 unittest
+from pathlib import Path
+
+from blueprintcompiler.formatter import Formatter
+
+
+class TestFormatter(unittest.TestCase):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.maxDiff = None
+
+    def assert_format_test(self, input_file, expected_file):
+        print("assert_format_test({}, {})".format(input_file, expected_file))
+        with open((Path(__file__).parent / f"formatting/{input_file}").resolve()) as f:
+            input_data = f.read()
+        with open(
+            (Path(__file__).parent / f"formatting/{expected_file}").resolve()
+        ) as f:
+            expected = f.read()
+
+        actual = Formatter.format(input_data)
+        self.assertEqual(actual, expected)
+
+    def test_formatter(self):
+        self.assert_format_test("in1.blp", "out.blp")
+        self.assert_format_test("in2.blp", "out.blp")
+        self.assert_format_test("correct1.blp", "correct1.blp")
+        self.assert_format_test("string_in.blp", "string_out.blp")