WIP: Add gir.PartialClass

blueprintcompiler/ast_utils.py

@@ -81,7 +81,7 @@ class AstNode:
     def _get_errors(self):
         for validator in self.validators:
             try:
-                validator(self)
+                validator.validate(self)
             except CompileError as e:
                 yield e
                 if e.fatal:
@@ -149,43 +149,61 @@ class AstNode:
 
 def validate(token_name=None, end_token_name=None, skip_incomplete=False):
     """ Decorator for functions that validate an AST node. Exceptions raised
-    during validation are marked with range information from the tokens. """
+    during validation are marked with range information from the tokens.
+    The return value of the function can also be used as a property, and if
+    the function raises a CompileError, the property will be None. """
 
     def decorator(func):
-        def inner(self):
-            if skip_incomplete and self.incomplete:
+        class Validator:
+            _validator = True
+
+            def __get__(self, instance, owner):
+                if instance is None:
+                    return self
+
+                try:
+                    return self.validate(instance)
+                except Exception as e:
+                    # Ignore errors and return None. This way, a diagnostic
+                    # is only emitted once. Don't ignore CompilerBugErrors
+                    # though, they should never happen.
+                    if isinstance(e, CompilerBugError):
+                        raise e
+                    return None
+
+            def validate(self, node):
+                if skip_incomplete and node.incomplete:
                     return
 
                 try:
-                func(self)
+                    return func(node)
                 except CompileError as e:
                     # If the node is only partially complete, then an error must
                     # have already been reported at the parsing stage
-                if self.incomplete:
+                    if node.incomplete:
                         return
 
                     # This mess of code sets the error's start and end positions
                     # from the tokens passed to the decorator, if they have not
                     # already been set
                     if e.start is None:
-                    if token := self.group.tokens.get(token_name):
+                        if token := node.group.tokens.get(token_name):
                             e.start = token.start
                         else:
-                        e.start = self.group.start
+                            e.start = node.group.start
 
                     if e.end is None:
-                    if token := self.group.tokens.get(end_token_name):
+                        if token := node.group.tokens.get(end_token_name):
                             e.end = token.end
-                    elif token := self.group.tokens.get(token_name):
+                        elif token := node.group.tokens.get(token_name):
                             e.end = token.end
                         else:
-                        e.end = self.group.end
+                            e.end = node.group.end
 
                     # Re-raise the exception
                     raise e
 
-        inner._validator = True
-        return inner
+        return Validator()
 
     return decorator
 

blueprintcompiler/completions.py

@@ -110,7 +110,7 @@ def gtk_object_completer(ast_node, match_variables):
     matches=new_statement_patterns,
 )
 def property_completer(ast_node, match_variables):
-    if ast_node.gir_class:
+    if ast_node.gir_class and hasattr(ast_node.gir_class, "properties"):
         for prop in ast_node.gir_class.properties:
             yield Completion(prop, CompletionItemKind.Property, snippet=f"{prop}: $0;")
 
@@ -136,7 +136,7 @@ def prop_value_completer(ast_node, match_variables):
     matches=new_statement_patterns,
 )
 def signal_completer(ast_node, match_variables):
-    if ast_node.gir_class:
+    if ast_node.gir_class and hasattr(ast_node.gir_class, "signals"):
         for signal in ast_node.gir_class.signals:
             if not isinstance(ast_node.parent, language.Object):
                 name = "on"

blueprintcompiler/gir.py

@@ -96,6 +96,9 @@ class GirType:
     def full_name(self) -> str:
         raise NotImplementedError()
 
+    def lookup_property(self, property: str):
+        raise CompileError(f"Type {self.full_name} does not have properties")
+
 
 class BasicType(GirType):
     name: str = "unknown type"
@@ -314,6 +317,17 @@ class Interface(GirNode, GirType):
             result.append(self.get_containing(Repository)._resolve_dir_entry(entry))
         return result
 
+    def lookup_property(self, property: str):
+        if prop := self.properties.get(property):
+            return prop
+        elif self.is_partial:
+            return None
+        else:
+            raise CompileError(
+                f"Interface {self.full_name} does not have a property called {property}",
+                did_you_mean=(property, self.properties.keys())
+            )
+
     def assignable_to(self, other) -> bool:
         if self == other:
             return True
@@ -323,7 +337,82 @@ class Interface(GirNode, GirType):
         return False
 
 
-class Class(GirNode, GirType):
+class GirClass(GirType):
+    @property
+    def abstract(self):
+        raise NotImplementedError()
+
+    @property
+    def parent(self):
+        raise NotImplementedError()
+
+    @property
+    def is_partial(self):
+        return False
+
+    @property
+    def implements(self):
+        return []
+
+    @property
+    def own_properties(self):
+        return {}
+
+    @property
+    def own_signals(self):
+        return {}
+
+    @cached_property
+    def properties(self):
+        return { p.name: p for p in self._enum_properties() }
+
+    @cached_property
+    def signals(self):
+        return { s.name: s for s in self._enum_signals() }
+
+    def lookup_property(self, property: str):
+        if prop := self.properties.get(property):
+            return prop
+        elif self.is_partial:
+            return None
+        else:
+            raise CompileError(
+                f"Class {self.full_name} does not have a property called {property}",
+                did_you_mean=(property, self.properties.keys())
+            )
+
+    def _enum_properties(self):
+        yield from self.own_properties.values()
+
+        if self.parent is not None:
+            yield from self.parent.properties.values()
+
+        for impl in self.implements:
+            yield from impl.properties.values()
+
+    def _enum_signals(self):
+        yield from self.own_signals.values()
+
+        if self.parent is not None:
+            yield from self.parent.signals.values()
+
+        for impl in self.implements:
+            yield from impl.signals.values()
+
+    def assignable_to(self, other) -> bool:
+        if self == other:
+            return True
+        elif self.parent and self.parent.assignable_to(other):
+            return True
+        else:
+            for iface in self.implements:
+                if iface.assignable_to(other):
+                    return True
+
+            return False
+
+
+class Class(GirNode, GirClass):
     def __init__(self, ns, tl: typelib.Typelib):
         super().__init__(ns, tl)
 
@@ -388,43 +477,31 @@ class Class(GirNode, GirType):
             result += " implements " + ", ".join([impl.full_name for impl in self.implements])
         return result
 
-    @cached_property
-    def properties(self):
-        return { p.name: p for p in self._enum_properties() }
 
-    @cached_property
-    def signals(self):
-        return { s.name: s for s in self._enum_signals() }
+class PartialClass(GirClass):
+    def __init__(self, name: str, parent: GirType = None):
+        self._name = name
+        self._parent = parent
 
-    def assignable_to(self, other) -> bool:
-        if self == other:
-            return True
-        elif self.parent and self.parent.assignable_to(other):
-            return True
-        else:
-            for iface in self.implements:
-                if iface.assignable_to(other):
-                    return True
+    @property
+    def full_name(self):
+        return self._name
 
+    @property
+    def glib_type_name(self):
+        return self._name
+
+    @property
+    def abstract(self):
         return False
 
-    def _enum_properties(self):
-        yield from self.own_properties.values()
+    @property
+    def parent(self):
+        return self._parent
 
-        if self.parent is not None:
-            yield from self.parent.properties.values()
-
-        for impl in self.implements:
-            yield from impl.properties.values()
-
-    def _enum_signals(self):
-        yield from self.own_signals.values()
-
-        if self.parent is not None:
-            yield from self.parent.signals.values()
-
-        for impl in self.implements:
-            yield from impl.signals.values()
+    @property
+    def is_partial(self):
+        return True
 
 
 class EnumMember(GirNode):

blueprintcompiler/language/expression.py

@@ -126,8 +126,7 @@ class LookupOp(InfixExpr):
     @property
     def gir_type(self):
         if parent_type := self.lhs.gir_type:
-            if isinstance(parent_type, gir.Class) or isinstance(parent_type, gir.Interface):
-                if prop := parent_type.properties.get(self.tokens["property"]):
+            if prop := parent_type.lookup_property(self.tokens["property"]):
                 return prop.type
 
     @property
@@ -137,15 +136,11 @@ class LookupOp(InfixExpr):
 
     @validate("property")
     def property_exists(self):
-        if parent_type := self.lhs.gir_type:
-            if not (isinstance(parent_type, gir.Class) or isinstance(parent_type, gir.Interface)):
-                raise CompileError(f"Type {parent_type.full_name} does not have properties")
-            elif self.tokens["property"] not in parent_type.properties:
-                raise CompileError(
-                    f"{parent_type.full_name} does not have a property called {self.tokens['property']}",
-                    hints=["Do you need to cast the previous expression?"],
-                    did_you_mean=(self.tokens['property'], parent_type.properties.keys()),
-                )
+        try:
+            self.gir_type
+        except CompileError as e:
+            e.hints.append("Do you need to cast the previous expression?")
+            raise e
 
     def emit_xml(self, xml: XmlEmitter):
         if isinstance(self.lhs, IdentExpr) and self.lhs.is_this:

blueprintcompiler/language/gobject_object.py

@@ -48,14 +48,7 @@ class Object(AstNode):
 
     @property
     def gir_class(self):
-        class_names = self.children[ClassName]
-        if len(class_names) > 0:
-            if isinstance(class_names[0].gir_type, Class):
-                return class_names[0].gir_type
-
-    @property
-    def glib_type_name(self) -> str:
-        return self.children[ClassName][0].glib_type_name
+        return self.children[ClassName][0].gir_type
 
     @docs("namespace")
     def namespace_docs(self):
@@ -83,7 +76,7 @@ class Object(AstNode):
 
     def emit_start_tag(self, xml: XmlEmitter):
         xml.start_tag("object", **{
-            "class": self.glib_type_name,
+            "class": self.gir_class,
             "id": self.tokens["id"],
         })
 

blueprintcompiler/language/gobject_property.py

@@ -64,37 +64,16 @@ class Property(AstNode):
     def gir_class(self):
         return self.parent.parent.gir_class
 
-
-    @property
+    @validate("name")
     def gir_property(self):
         if self.gir_class is not None:
-            return self.gir_class.properties.get(self.tokens["name"])
-
+            return self.gir_class.lookup_property(self.tokens["name"])
 
     @property
     def value_type(self):
         if self.gir_property is not None:
             return self.gir_property.type
 
-
-    @validate("name")
-    def property_exists(self):
-        if self.gir_class is None:
-            # Objects that we have no gir data on should not be validated
-            # This happens for classes defined by the app itself
-            return
-
-        if isinstance(self.parent.parent, Template):
-            # If the property is part of a template, it might be defined by
-            # the application and thus not in gir
-            return
-
-        if self.gir_property is None:
-            raise CompileError(
-                f"Class {self.gir_class.full_name} does not contain a property called {self.tokens['name']}",
-                did_you_mean=(self.tokens["name"], self.gir_class.properties.keys())
-            )
-
     @validate("bind")
     def property_bindable(self):
         if self.tokens["bind"] and self.gir_property is not None and self.gir_property.construct_only:

blueprintcompiler/language/gtk_file_filter.py

@@ -27,17 +27,12 @@ class Filters(AstNode):
     def container_is_file_filter(self):
         validate_parent_type(self, "Gtk", "FileFilter", "file filter properties")
 
-    @validate()
-    def unique_in_parent(self):
-        # The token argument to validate() needs to be calculated based on
-        # the instance, hence wrapping it like this.
-        @validate(self.tokens["tag_name"])
+    @validate("tag")
     def wrapped_validator(self):
         self.validate_unique_in_parent(
             f"Duplicate {self.tokens['tag_name']} block",
             check=lambda child: child.tokens["tag_name"] == self.tokens["tag_name"],
         )
-        wrapped_validator(self)
 
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag(self.tokens["tag_name"])
@@ -57,7 +52,7 @@ def create_node(tag_name: str, singular: str):
     return Group(
         Filters,
         [
-            Keyword(tag_name),
+            Keyword(tag_name, "tag"),
             UseLiteral("tag_name", tag_name),
             "[",
             Delimited(

blueprintcompiler/language/gtkbuilder_child.py

@@ -49,6 +49,10 @@ class Child(AstNode):
                 if gir_class.assignable_to(parent_type):
                     break
             else:
+                if gir_class.is_partial:
+                    # we don't know if the class implements Gtk.Buildable or not
+                    return
+
                 hints=["only Gio.ListStore or Gtk.Buildable implementors can have children"]
                 if "child" in gir_class.properties:
                     hints.append("did you mean to assign this object to the 'child' property?")

blueprintcompiler/language/gtkbuilder_template.py

@@ -17,6 +17,7 @@
 #
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
+from functools import cached_property
 
 from .gobject_object import Object, ObjectContent
 from .common import *
@@ -34,11 +35,14 @@ class Template(Object):
         ObjectContent,
     ]
 
-    @property
+    @cached_property
     def gir_class(self):
         # Templates might not have a parent class defined
+        parent = None
         if len(self.children[ClassName]):
-            return self.children[ClassName][0].gir_type
+            parent = self.children[ClassName][0].gir_type
+
+        return gir.PartialClass(self.tokens["id"], parent)
 
     @validate("id")
     def unique_in_parent(self):

blueprintcompiler/language/imports.py

@@ -25,7 +25,7 @@ from .common import *
 class GtkDirective(AstNode):
     grammar = Statement(
         Match("using").err("File must start with a \"using Gtk\" directive (e.g. `using Gtk 4.0;`)"),
-        Match("Gtk").err("File must start with a \"using Gtk\" directive (e.g. `using Gtk 4.0;`)"),
+        Keyword("Gtk").err("File must start with a \"using Gtk\" directive (e.g. `using Gtk 4.0;`)"),
         UseNumberText("version").expected("a version number for GTK"),
     )
 
@@ -33,15 +33,23 @@ class GtkDirective(AstNode):
     def gtk_version(self):
         version = self.tokens["version"]
         if version not in ["4.0"]:
-            err = CompileError("Only GTK 4 is supported")
+            err = CompileError("Only GTK 4 is supported", fatal=True)
             if version and version.startswith("4"):
                 err.hint("Expected the GIR version, not an exact version number. Use 'using Gtk 4.0;'.")
             else:
                 err.hint("Expected 'using Gtk 4.0;'")
             raise err
 
+        return version
+
+    @validate()
+    def gir_namespace(self):
+        if self.gtk_version is None:
+            # use that error message instead
+            return
+
         try:
-            gir.get_namespace("Gtk", version)
+            return gir.get_namespace("Gtk", self.gtk_version)
         except CompileError as e:
             raise CompileError(
                 "Could not find GTK 4 introspection files. Is gobject-introspection installed?",
@@ -52,18 +60,9 @@ class GtkDirective(AstNode):
             )
 
 
-    @property
-    def gir_namespace(self):
-        # validate the GTK version first to make sure the more specific error
-        # message is emitted
-        self.gtk_version()
-        return gir.get_namespace("Gtk", self.tokens["version"])
-
-
     def emit_xml(self, xml: XmlEmitter):
         xml.put_self_closing("requires", lib="gtk", version=self.tokens["version"])
 
-
 class Import(AstNode):
     grammar = Statement(
         "using",

blueprintcompiler/language/types.py

@@ -19,8 +19,9 @@
 
 
 import typing as T
+from functools import cached_property
 from .common import *
-from ..gir import Class, Interface
+from ..gir import GirClass, Class, Interface
 
 
 class TypeName(AstNode):
@@ -53,18 +54,16 @@ class TypeName(AstNode):
         if not self.tokens["ignore_gir"]:
             return self.root.gir.namespaces.get(self.tokens["namespace"] or "Gtk")
 
-    @property
+    @cached_property
     def gir_type(self) -> T.Optional[gir.Class]:
-        if self.tokens["class_name"] and not self.tokens["ignore_gir"]:
+        if self.tokens["ignore_gir"]:
+            return gir.PartialClass(self.tokens["class_name"])
+        else:
             return self.root.gir.get_type(self.tokens["class_name"], self.tokens["namespace"])
-        return None
 
     @property
     def glib_type_name(self) -> str:
-        if gir_type := self.gir_type:
-            return gir_type.glib_type_name
-        else:
-            return self.tokens["class_name"]
+        return self.gir_type.glib_type_name
 
     @docs("namespace")
     def namespace_docs(self):
@@ -83,7 +82,7 @@ class TypeName(AstNode):
 class ClassName(TypeName):
     @validate("namespace", "class_name")
     def gir_class_exists(self):
-        if self.gir_type is not None and not isinstance(self.gir_type, Class):
+        if self.gir_type is not None and not isinstance(self.gir_type, GirClass):
             if isinstance(self.gir_type, Interface):
                 raise CompileError(f"{self.gir_type.full_name} is an interface, not a class")
             else:

blueprintcompiler/language/ui.py

@@ -42,7 +42,8 @@ class UI(AstNode, Scope):
         self._gir_errors = []
 
         try:
-            gir_ctx.add_namespace(self.children[GtkDirective][0].gir_namespace)
+            if ns := self.children[GtkDirective][0].gir_namespace:
+                gir_ctx.add_namespace(ns)
         except CompileError as e:
             self._gir_errors.append(e)
 
@@ -70,7 +71,7 @@ class UI(AstNode, Scope):
             xml.end_tag()
 
         return {
-            id: ScopeVariable(id, obj.gir_class, lambda xml, id=id: emit_xml(xml, id), obj.glib_type_name)
+            id: ScopeVariable(id, obj.gir_class, lambda xml, id=id: emit_xml(xml, id))
             for id, obj in self.objects_by_id.items()
         }
 

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")