Change the way values work

Change the parsing for values to make them more reusable, in particular
for when I implement extensions.

.gitlab-ci.yml

@@ -18,7 +18,7 @@ build:
     - ninja -C _build docs/en
     - git clone https://gitlab.gnome.org/jwestman/blueprint-regression-tests.git
     - cd blueprint-regression-tests
-    - git checkout 58fda9381dac4a9c42c18a4b06149ed59ee702dc
+    - git checkout 59eecfbd73020889410da6cc9f5ce90e5b6f9e24
     - ./test.sh
     - cd ..
   coverage: '/TOTAL.*\s([.\d]+)%/'

blueprintcompiler/ast_utils.py

@@ -24,6 +24,8 @@ import typing as T
 from .errors import *
 from .lsp_utils import SemanticToken
 
+TType = T.TypeVar("TType")
+
 
 class Children:
     """Allows accessing children by type using array syntax."""
@@ -34,6 +36,14 @@ class Children:
     def __iter__(self):
         return iter(self._children)
 
+    @T.overload
+    def __getitem__(self, key: T.Type[TType]) -> T.List[TType]:
+        ...
+
+    @T.overload
+    def __getitem__(self, key: int) -> "AstNode":
+        ...
+
     def __getitem__(self, key):
         if isinstance(key, int):
             return self._children[key]
@@ -41,6 +51,27 @@ class Children:
             return [child for child in self._children if isinstance(child, key)]
 
 
+TCtx = T.TypeVar("TCtx")
+TAttr = T.TypeVar("TAttr")
+
+
+class Ctx:
+    """Allows accessing values from higher in the syntax tree."""
+
+    def __init__(self, node: "AstNode") -> None:
+        self.node = node
+
+    def __getitem__(self, key: T.Type[TCtx]) -> T.Optional[TCtx]:
+        attrs = self.node._attrs_by_type(Context)
+        for name, attr in attrs:
+            if attr.type == key:
+                return getattr(self.node, name)
+        if self.node.parent is not None:
+            return self.node.parent.context[key]
+        else:
+            return None
+
+
 class AstNode:
     """Base class for nodes in the abstract syntax tree."""
 
@@ -62,6 +93,10 @@ class AstNode:
             getattr(cls, f) for f in dir(cls) if hasattr(getattr(cls, f), "_validator")
         ]
 
+    @cached_property
+    def context(self):
+        return Ctx(self)
+
     @property
     def root(self):
         if self.parent is None:
@@ -105,7 +140,9 @@ class AstNode:
         for child in self.children:
             yield from child._get_errors()
 
-    def _attrs_by_type(self, attr_type):
+    def _attrs_by_type(
+        self, attr_type: T.Type[TAttr]
+    ) -> T.Iterator[T.Tuple[str, TAttr]]:
         for name in dir(type(self)):
             item = getattr(type(self), name)
             if isinstance(item, attr_type):
@@ -217,3 +254,23 @@ def docs(*args, **kwargs):
         return Docs(func, *args, **kwargs)
 
     return decorator
+
+
+class Context:
+    def __init__(self, type: T.Type[TCtx], func: T.Callable[[AstNode], TCtx]) -> None:
+        self.type = type
+        self.func = func
+
+    def __get__(self, instance, owner):
+        if instance is None:
+            return self
+        return self.func(instance)
+
+
+def context(type: T.Type[TCtx]):
+    """Decorator for functions that return a context object, which is passed down to ."""
+
+    def decorator(func: T.Callable[[AstNode], TCtx]) -> Context:
+        return Context(type, func)
+
+    return decorator

blueprintcompiler/decompiler.py

@@ -295,7 +295,7 @@ def decompile_property(
             flags += " inverted"
         if "bidirectional" in bind_flags:
             flags += " bidirectional"
-        ctx.print(f"{name}: bind {bind_source}.{bind_property}{flags};")
+        ctx.print(f"{name}: bind-property {bind_source}.{bind_property}{flags};")
     elif truthy(translatable):
         if context is not None:
             ctx.print(

blueprintcompiler/language/__init__.py

@@ -1,4 +1,6 @@
 from .attributes import BaseAttribute, BaseTypedAttribute
+from .binding import Binding
+from .contexts import ValueTypeCtx
 from .expression import CastExpr, ClosureExpr, Expr, ExprChain, IdentExpr, LookupOp
 from .gobject_object import Object, ObjectContent
 from .gobject_property import Property
@@ -14,16 +16,21 @@ from .gtk_styles import Styles
 from .gtkbuilder_child import Child
 from .gtkbuilder_template import Template
 from .imports import GtkDirective, Import
+from .property_binding import PropertyBinding
 from .ui import UI
 from .types import ClassName
 from .values import (
-    TypeValue,
-    IdentValue,
-    TranslatedStringValue,
-    FlagsValue,
     Flag,
-    QuotedValue,
+    Flags,
-    NumberValue,
+    IdentLiteral,
+    Literal,
+    NumberLiteral,
+    ObjectValue,
+    QuotedLiteral,
+    Translated,
+    TranslatedWithContext,
+    TranslatedWithoutContext,
+    TypeLiteral,
     Value,
 )
 
@@ -43,12 +50,3 @@ OBJECT_CONTENT_HOOKS.children = [
     Strings,
     Child,
 ]
-
-VALUE_HOOKS.children = [
-    TypeValue,
-    TranslatedStringValue,
-    FlagsValue,
-    IdentValue,
-    QuotedValue,
-    NumberValue,
-]

blueprintcompiler/language/attributes.py

@@ -18,7 +18,7 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
 
-from .values import Value, TranslatedStringValue
+from .values import Value, Translated
 from .common import *
 
 

blueprintcompiler/language/binding.py

@@ -0,0 +1,55 @@
+# binding.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
+
+from dataclasses import dataclass
+
+from .common import *
+from .expression import ExprChain, LookupOp, IdentExpr
+from .contexts import ValueTypeCtx
+
+
+class Binding(AstNode):
+    grammar = [
+        Keyword("bind"),
+        ExprChain,
+    ]
+
+    @property
+    def expression(self) -> ExprChain:
+        return self.children[ExprChain][0]
+
+    @property
+    def simple_binding(self) -> T.Optional["SimpleBinding"]:
+        if isinstance(self.expression.last, LookupOp):
+            if isinstance(self.expression.last.lhs, IdentExpr):
+                return SimpleBinding(
+                    self.expression.last.lhs.ident, self.expression.last.property_name
+                )
+        return None
+
+    @validate("bind")
+    def not_bindable(self) -> None:
+        if binding_error := self.context[ValueTypeCtx].binding_error:
+            raise binding_error
+
+
+@dataclass
+class SimpleBinding:
+    source: str
+    property_name: str

blueprintcompiler/language/common.py

@@ -19,7 +19,7 @@
 
 
 from .. import gir
-from ..ast_utils import AstNode, validate, docs
+from ..ast_utils import AstNode, validate, docs, context
 from ..errors import (
     CompileError,
     MultipleErrors,
@@ -44,4 +44,3 @@ from ..parse_tree import *
 
 
 OBJECT_CONTENT_HOOKS = AnyOf()
-VALUE_HOOKS = AnyOf()

blueprintcompiler/language/contexts.py

@@ -0,0 +1,28 @@
+# contexts.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 typing as T
+from dataclasses import dataclass
+from .common import *
+
+
+@dataclass
+class ValueTypeCtx:
+    value_type: T.Optional[GirType]
+    binding_error: T.Optional[CompileError] = None

blueprintcompiler/language/expression.py

@@ -20,6 +20,7 @@
 
 from .common import *
 from .types import TypeName
+from .gtkbuilder_template import Template
 
 
 expr = Pratt()
@@ -30,6 +31,10 @@ class Expr(AstNode):
     def type(self) -> T.Optional[GirType]:
         raise NotImplementedError()
 
+    @property
+    def type_complete(self) -> bool:
+        return True
+
     @property
     def rhs(self) -> T.Optional["Expr"]:
         if isinstance(self.parent, ExprChain):
@@ -53,6 +58,10 @@ class ExprChain(Expr):
     def type(self) -> T.Optional[GirType]:
         return self.last.type
 
+    @property
+    def type_complete(self) -> bool:
+        return self.last.type_complete
+
 
 class InfixExpr(Expr):
     @property
@@ -83,6 +92,13 @@ class IdentExpr(Expr):
         else:
             return None
 
+    @property
+    def type_complete(self) -> bool:
+        if object := self.root.objects_by_id.get(self.ident):
+            return not isinstance(object, Template)
+        else:
+            return True
+
 
 class LookupOp(InfixExpr):
     grammar = [".", UseIdent("property")]
@@ -103,17 +119,24 @@ class LookupOp(InfixExpr):
 
     @validate("property")
     def property_exists(self):
-        if self.lhs.type is None or isinstance(self.lhs.type, UncheckedType):
+        if (
+            self.lhs.type is None
+            or not self.lhs.type_complete
+            or isinstance(self.lhs.type, UncheckedType)
+        ):
             return
+
         elif not isinstance(self.lhs.type, gir.Class) and not isinstance(
             self.lhs.type, gir.Interface
         ):
             raise CompileError(
                 f"Type {self.lhs.type.full_name} does not have properties"
             )
+
         elif self.lhs.type.properties.get(self.property_name) is None:
             raise CompileError(
-                f"{self.lhs.type.full_name} does not have a property called {self.property_name}"
+                f"{self.lhs.type.full_name} does not have a property called {self.property_name}",
+                did_you_mean=(self.property_name, self.lhs.type.properties.keys()),
             )
 
 
@@ -124,9 +147,13 @@ class CastExpr(InfixExpr):
     def type(self) -> T.Optional[GirType]:
         return self.children[TypeName][0].gir_type
 
+    @property
+    def type_complete(self) -> bool:
+        return True
+
     @validate()
     def cast_makes_sense(self):
-        if self.lhs.type is None:
+        if self.type is None or self.lhs.type is None:
             return
 
         if not self.type.assignable_to(self.lhs.type):

blueprintcompiler/language/gobject_property.py

@@ -17,51 +17,28 @@
 #
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
+from dataclasses import dataclass
 
 from .expression import ExprChain
 from .gobject_object import Object
 from .gtkbuilder_template import Template
-from .values import Value, TranslatedStringValue
+from .values import Value, Translated
 from .common import *
+from .contexts import ValueTypeCtx
+from .property_binding import PropertyBinding
+from .binding import Binding
 
 
 class Property(AstNode):
-    grammar = AnyOf(
+    grammar = [UseIdent("name"), ":", Value, ";"]
-        [
+
-            UseIdent("name"),
+    @property
-            ":",
+    def name(self) -> str:
-            Keyword("bind"),
+        return self.tokens["name"]
-            UseIdent("bind_source"),
+
-            ".",
+    @property
-            UseIdent("bind_property"),
+    def value(self) -> Value:
-            ZeroOrMore(
+        return self.children[0]
-                AnyOf(
-                    ["no-sync-create", UseLiteral("no_sync_create", True)],
-                    ["inverted", UseLiteral("inverted", True)],
-                    ["bidirectional", UseLiteral("bidirectional", True)],
-                    Match("sync-create").warn(
-                        "sync-create is deprecated in favor of no-sync-create"
-                    ),
-                )
-            ),
-            ";",
-        ],
-        Statement(
-            UseIdent("name"),
-            UseLiteral("binding", True),
-            ":",
-            "bind",
-            ExprChain,
-        ),
-        Statement(
-            UseIdent("name"),
-            ":",
-            AnyOf(
-                Object,
-                VALUE_HOOKS,
-            ).expected("a value"),
-        ),
-    )
 
     @property
     def gir_class(self):
@@ -72,10 +49,29 @@ class Property(AstNode):
         if self.gir_class is not None and not isinstance(self.gir_class, UncheckedType):
             return self.gir_class.properties.get(self.tokens["name"])
 
-    @property
+    @context(ValueTypeCtx)
-    def value_type(self):
+    def value_type(self) -> ValueTypeCtx:
+        if (
+            (
+                isinstance(self.value.child, PropertyBinding)
+                or isinstance(self.value.child, Binding)
+            )
+            and self.gir_property is not None
+            and self.gir_property.construct_only
+        ):
+            binding_error = CompileError(
+                f"{self.gir_property.full_name} can't be bound because it is construct-only",
+                hints=["construct-only properties may only be set to a static value"],
+            )
+        else:
+            binding_error = None
+
         if self.gir_property is not None:
-            return self.gir_property.type
+            type = self.gir_property.type
+        else:
+            type = None
+
+        return ValueTypeCtx(type, binding_error)
 
     @validate("name")
     def property_exists(self):
@@ -95,40 +91,11 @@ class Property(AstNode):
                 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
-        ):
-            raise CompileError(
-                f"{self.gir_property.full_name} can't be bound because it is construct-only",
-                hints=["construct-only properties may only be set to a static value"],
-            )
-
     @validate("name")
     def property_writable(self):
         if self.gir_property is not None and not self.gir_property.writable:
             raise CompileError(f"{self.gir_property.full_name} is not writable")
 
-    @validate()
-    def obj_property_type(self):
-        if len(self.children[Object]) == 0:
-            return
-
-        object = self.children[Object][0]
-        type = self.value_type
-        if (
-            object
-            and type
-            and object.gir_class
-            and not object.gir_class.assignable_to(type)
-        ):
-            raise CompileError(
-                f"Cannot assign {object.gir_class.full_name} to {type.full_name}"
-            )
-
     @validate("name")
     def unique_in_parent(self):
         self.validate_unique_in_parent(

blueprintcompiler/language/gobject_signal.py

@@ -82,10 +82,11 @@ class Signal(AstNode):
     @validate("handler")
     def old_extern(self):
         if not self.tokens["extern"]:
-            raise UpgradeWarning(
+            if self.handler is not None:
-                "Use the '$' extern syntax introduced in blueprint 0.8.0",
+                raise UpgradeWarning(
-                actions=[CodeAction("Use '$' syntax", "$" + self.tokens["handler"])],
+                    "Use the '$' extern syntax introduced in blueprint 0.8.0",
-            )
+                    actions=[CodeAction("Use '$' syntax", "$" + self.handler)],
+                )
 
     @validate("name")
     def signal_exists(self):

blueprintcompiler/language/gtk_a11y.py

@@ -21,6 +21,7 @@ from .gobject_object import ObjectContent, validate_parent_type
 from .attributes import BaseTypedAttribute
 from .values import Value
 from .common import *
+from .contexts import ValueTypeCtx
 
 
 def get_property_types(gir):
@@ -108,7 +109,7 @@ class A11yProperty(BaseTypedAttribute):
     grammar = Statement(
         UseIdent("name"),
         ":",
-        VALUE_HOOKS.expected("a value"),
+        Value,
     )
 
     @property
@@ -129,8 +130,12 @@ class A11yProperty(BaseTypedAttribute):
         return self.tokens["name"].replace("_", "-")
 
     @property
-    def value_type(self) -> GirType:
+    def value(self) -> Value:
-        return get_types(self.root.gir).get(self.tokens["name"])
+        return self.children[0]
+
+    @context(ValueTypeCtx)
+    def value_type(self) -> ValueTypeCtx:
+        return ValueTypeCtx(get_types(self.root.gir).get(self.tokens["name"]))
 
     @validate("name")
     def is_valid_property(self):
@@ -161,6 +166,10 @@ class A11y(AstNode):
         Until(A11yProperty, "}"),
     ]
 
+    @property
+    def properties(self) -> T.List[A11yProperty]:
+        return self.children[A11yProperty]
+
     @validate("accessibility")
     def container_is_widget(self):
         validate_parent_type(self, "Gtk", "Widget", "accessibility properties")

blueprintcompiler/language/gtk_combo_box_text.py

@@ -21,15 +21,22 @@
 from .attributes import BaseTypedAttribute
 from .gobject_object import ObjectContent, validate_parent_type
 from .common import *
+from .contexts import ValueTypeCtx
+from .values import Value
 
 
-class Item(BaseTypedAttribute):
+class Item(AstNode):
-    tag_name = "item"
+    @property
-    attr_name = "id"
+    def name(self) -> str:
+        return self.tokens["name"]
 
     @property
-    def value_type(self):
+    def value(self) -> Value:
-        return StringType()
+        return self.children[Value][0]
+
+    @context(ValueTypeCtx)
+    def value_type(self) -> ValueTypeCtx:
+        return ValueTypeCtx(StringType())
 
 
 item = Group(
@@ -41,7 +48,7 @@ item = Group(
                 ":",
             ]
         ),
-        VALUE_HOOKS,
+        Value,
     ],
 )
 

blueprintcompiler/language/gtk_layout.py

@@ -21,15 +21,25 @@
 from .attributes import BaseAttribute
 from .gobject_object import ObjectContent, validate_parent_type
 from .common import *
+from .contexts import ValueTypeCtx
+from .values import Value
 
 
-class LayoutProperty(BaseAttribute):
+class LayoutProperty(AstNode):
     tag_name = "property"
 
     @property
-    def value_type(self):
+    def name(self) -> str:
+        return self.tokens["name"]
+
+    @property
+    def value(self) -> Value:
+        return self.children[Value][0]
+
+    @context(ValueTypeCtx)
+    def value_type(self) -> ValueTypeCtx:
         # there isn't really a way to validate these
-        return None
+        return ValueTypeCtx(None)
 
     @validate("name")
     def unique_in_parent(self):
@@ -41,11 +51,7 @@ class LayoutProperty(BaseAttribute):
 
 layout_prop = Group(
     LayoutProperty,
-    Statement(
+    Statement(UseIdent("name"), ":", Err(Value, "Expected a value")),
-        UseIdent("name"),
-        ":",
-        VALUE_HOOKS.expected("a value"),
-    ),
 )
 
 

blueprintcompiler/language/gtk_menu.py

@@ -24,6 +24,7 @@ from blueprintcompiler.language.values import Value
 from .attributes import BaseAttribute
 from .gobject_object import Object, ObjectContent
 from .common import *
+from .contexts import ValueTypeCtx
 
 
 class Menu(AstNode):
@@ -49,17 +50,23 @@ class Menu(AstNode):
             raise CompileError("Menu requires an ID")
 
 
-class MenuAttribute(BaseAttribute):
+class MenuAttribute(AstNode):
     tag_name = "attribute"
 
     @property
-    def value_type(self):
+    def name(self) -> str:
-        return None
+        return self.tokens["name"]
 
     @property
     def value(self) -> Value:
         return self.children[Value][0]
 
+    @context(ValueTypeCtx)
+    def value_type(self) -> ValueTypeCtx:
+        return ValueTypeCtx(
+            None, binding_error=CompileError("Bindings are not permitted in menus")
+        )
+
 
 menu_contents = Sequence()
 
@@ -78,7 +85,7 @@ menu_attribute = Group(
     [
         UseIdent("name"),
         ":",
-        VALUE_HOOKS.expected("a value"),
+        Err(Value, "Expected a value"),
         Match(";").expected(),
     ],
 )
@@ -102,7 +109,7 @@ menu_item_shorthand = Group(
         "(",
         Group(
             MenuAttribute,
-            [UseLiteral("name", "label"), VALUE_HOOKS],
+            [UseLiteral("name", "label"), Value],
         ),
         Optional(
             [
@@ -111,14 +118,14 @@ menu_item_shorthand = Group(
                     [
                         Group(
                             MenuAttribute,
-                            [UseLiteral("name", "action"), VALUE_HOOKS],
+                            [UseLiteral("name", "action"), Value],
                         ),
                         Optional(
                             [
                                 ",",
                                 Group(
                                     MenuAttribute,
-                                    [UseLiteral("name", "icon"), VALUE_HOOKS],
+                                    [UseLiteral("name", "icon"), Value],
                                 ),
                             ]
                         ),

blueprintcompiler/language/gtk_string_list.py

@@ -20,16 +20,17 @@
 
 from .attributes import BaseTypedAttribute
 from .gobject_object import ObjectContent, validate_parent_type
-from .values import Value, TranslatedStringValue
+from .values import Value, Translated
 from .common import *
+from .contexts import ValueTypeCtx
 
 
 class Item(AstNode):
-    grammar = VALUE_HOOKS
+    grammar = Value
 
-    @property
+    @context(ValueTypeCtx)
-    def value_type(self):
+    def value_type(self) -> ValueTypeCtx:
-        return StringType()
+        return ValueTypeCtx(StringType())
 
 
 class Strings(AstNode):

blueprintcompiler/language/imports.py

@@ -64,6 +64,9 @@ class GtkDirective(AstNode):
         self.gtk_version()
         if self.tokens["version"] is not None:
             return gir.get_namespace("Gtk", self.tokens["version"])
+        else:
+            # For better error handling, just assume it's 4.0
+            return gir.get_namespace("Gtk", "4.0")
 
 
 class Import(AstNode):

blueprintcompiler/language/property_binding.py

@@ -0,0 +1,139 @@
+# property_binding.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
+
+from .common import *
+from .contexts import ValueTypeCtx
+from .gobject_object import Object
+from .gtkbuilder_template import Template
+
+
+class PropertyBindingFlag(AstNode):
+    grammar = [
+        AnyOf(
+            UseExact("flag", "inverted"),
+            UseExact("flag", "bidirectional"),
+            UseExact("flag", "no-sync-create"),
+            UseExact("flag", "sync-create"),
+        )
+    ]
+
+    @property
+    def flag(self) -> str:
+        return self.tokens["flag"]
+
+    @validate()
+    def sync_create(self):
+        if self.flag == "sync-create":
+            raise UpgradeWarning(
+                "'sync-create' is now the default. Use 'no-sync-create' if this is not wanted.",
+                actions=[CodeAction("remove 'sync-create'", "")],
+            )
+
+
+class PropertyBinding(AstNode):
+    grammar = AnyOf(
+        [
+            Keyword("bind-property"),
+            UseIdent("source"),
+            ".",
+            UseIdent("property"),
+            ZeroOrMore(PropertyBindingFlag),
+        ],
+        [
+            Keyword("bind"),
+            UseIdent("source"),
+            ".",
+            UseIdent("property"),
+            PropertyBindingFlag,
+            ZeroOrMore(PropertyBindingFlag),
+        ],
+    )
+
+    @property
+    def source(self) -> str:
+        return self.tokens["source"]
+
+    @property
+    def source_obj(self) -> T.Optional[Object]:
+        return self.root.objects_by_id.get(self.source)
+
+    @property
+    def property_name(self) -> str:
+        return self.tokens["property"]
+
+    @property
+    def flags(self) -> T.List[PropertyBindingFlag]:
+        return self.children[PropertyBindingFlag]
+
+    @property
+    def inverted(self) -> bool:
+        return any([f.flag == "inverted" for f in self.flags])
+
+    @property
+    def bidirectional(self) -> bool:
+        return any([f.flag == "bidirectional" for f in self.flags])
+
+    @property
+    def no_sync_create(self) -> bool:
+        return any([f.flag == "no-sync-create" for f in self.flags])
+
+    @validate("source")
+    def source_object_exists(self) -> None:
+        if self.source_obj is None:
+            raise CompileError(
+                f"Could not find object with ID {self.source}",
+                did_you_mean=(self.source, self.root.objects_by_id.keys()),
+            )
+
+    @validate("property")
+    def property_exists(self) -> None:
+        if self.source_obj is None:
+            return
+
+        gir_class = self.source_obj.gir_class
+
+        if (
+            isinstance(self.source_obj, Template)
+            or gir_class is None
+            or isinstance(gir_class, UncheckedType)
+        ):
+            # Objects that we have no gir data on should not be validated
+            # This happens for classes defined by the app itself
+            return
+
+        if (
+            isinstance(gir_class, gir.Class)
+            and gir_class.properties.get(self.property_name) is None
+        ):
+            raise CompileError(
+                f"{gir_class.full_name} does not have a property called {self.property_name}"
+            )
+
+    @validate("bind-property")
+    def not_bindable(self) -> None:
+        if binding_error := self.context[ValueTypeCtx].binding_error:
+            raise binding_error
+
+    @validate("bind")
+    def old_bind(self):
+        if self.tokens["bind"]:
+            raise UpgradeWarning(
+                "Use 'bind-property', introduced in blueprint 0.8.0, to use binding flags",
+                actions=[CodeAction("Use 'bind-property'", "bind-property")],
+            )

blueprintcompiler/language/types.py

@@ -94,7 +94,7 @@ class ClassName(TypeName):
     @validate("namespace", "class_name")
     def gir_class_exists(self):
         if (
-            self.gir_type
+            self.gir_type is not None
             and not isinstance(self.gir_type, UncheckedType)
             and not isinstance(self.gir_type, Class)
         ):

blueprintcompiler/language/values.py

@@ -21,41 +21,57 @@ import typing as T
 
 from .common import *
 from .types import TypeName
+from .property_binding import PropertyBinding
+from .binding import Binding
+from .gobject_object import Object
+from .contexts import ValueTypeCtx
 
 
-class Value(AstNode):
+class TranslatedWithoutContext(AstNode):
-    pass
+    grammar = ["_", "(", UseQuoted("string"), Optional(","), ")"]
-
-
-class TranslatedStringValue(Value):
-    grammar = AnyOf(
-        [
-            "_",
-            "(",
-            UseQuoted("value").expected("a quoted string"),
-            Match(")").expected(),
-        ],
-        [
-            "C_",
-            "(",
-            UseQuoted("context").expected("a quoted string"),
-            ",",
-            UseQuoted("value").expected("a quoted string"),
-            Optional(","),
-            Match(")").expected(),
-        ],
-    )
 
     @property
     def string(self) -> str:
-        return self.tokens["value"]
+        return self.tokens["string"]
+
+
+class TranslatedWithContext(AstNode):
+    grammar = [
+        "C_",
+        "(",
+        UseQuoted("context"),
+        ",",
+        UseQuoted("string"),
+        Optional(","),
+        ")",
+    ]
 
     @property
-    def context(self) -> T.Optional[str]:
+    def string(self) -> str:
+        return self.tokens["string"]
+
+    @property
+    def context(self) -> str:
         return self.tokens["context"]
 
 
-class TypeValue(Value):
+class Translated(AstNode):
+    grammar = AnyOf(TranslatedWithoutContext, TranslatedWithContext)
+
+    @property
+    def child(self) -> T.Union[TranslatedWithContext, TranslatedWithoutContext]:
+        return self.children[0]
+
+    @validate()
+    def validate_for_type(self) -> None:
+        expected_type = self.context[ValueTypeCtx].value_type
+        if expected_type is not None and not expected_type.assignable_to(StringType()):
+            raise CompileError(
+                f"Cannot convert translated string to {expected_type.full_name}"
+            )
+
+
+class TypeLiteral(AstNode):
     grammar = [
         "typeof",
         "(",
@@ -64,17 +80,17 @@ class TypeValue(Value):
     ]
 
     @property
-    def type_name(self):
+    def type_name(self) -> TypeName:
         return self.children[TypeName][0]
 
     @validate()
-    def validate_for_type(self):
+    def validate_for_type(self) -> None:
-        type = self.parent.value_type
+        expected_type = self.context[ValueTypeCtx].value_type
-        if type is not None and not isinstance(type, gir.TypeType):
+        if expected_type is not None and not isinstance(expected_type, gir.TypeType):
-            raise CompileError(f"Cannot convert GType to {type.full_name}")
+            raise CompileError(f"Cannot convert GType to {expected_type.full_name}")
 
 
-class QuotedValue(Value):
+class QuotedLiteral(AstNode):
     grammar = UseQuoted("value")
 
     @property
@@ -82,22 +98,22 @@ class QuotedValue(Value):
         return self.tokens["value"]
 
     @validate()
-    def validate_for_type(self):
+    def validate_for_type(self) -> None:
-        type = self.parent.value_type
+        expected_type = self.context[ValueTypeCtx].value_type
         if (
-            isinstance(type, gir.IntType)
+            isinstance(expected_type, gir.IntType)
-            or isinstance(type, gir.UIntType)
+            or isinstance(expected_type, gir.UIntType)
-            or isinstance(type, gir.FloatType)
+            or isinstance(expected_type, gir.FloatType)
         ):
             raise CompileError(f"Cannot convert string to number")
 
-        elif isinstance(type, gir.StringType):
+        elif isinstance(expected_type, gir.StringType):
             pass
 
         elif (
-            isinstance(type, gir.Class)
+            isinstance(expected_type, gir.Class)
-            or isinstance(type, gir.Interface)
+            or isinstance(expected_type, gir.Interface)
-            or isinstance(type, gir.Boxed)
+            or isinstance(expected_type, gir.Boxed)
         ):
             parseable_types = [
                 "Gdk.Paintable",
@@ -111,31 +127,32 @@ class QuotedValue(Value):
                 "Gsk.Transform",
                 "GLib.Variant",
             ]
-            if type.full_name not in parseable_types:
+            if expected_type.full_name not in parseable_types:
                 hints = []
-                if isinstance(type, gir.TypeType):
+                if isinstance(expected_type, gir.TypeType):
-                    hints.append(
+                    hints.append(f"use the typeof operator: 'typeof({self.value})'")
-                        f"use the typeof operator: 'typeof({self.tokens('value')})'"
-                    )
                 raise CompileError(
-                    f"Cannot convert string to {type.full_name}", hints=hints
+                    f"Cannot convert string to {expected_type.full_name}", hints=hints
                 )
 
-        elif type is not None:
+        elif expected_type is not None:
-            raise CompileError(f"Cannot convert string to {type.full_name}")
+            raise CompileError(f"Cannot convert string to {expected_type.full_name}")
 
 
-class NumberValue(Value):
+class NumberLiteral(AstNode):
-    grammar = UseNumber("value")
+    grammar = [
+        Optional(AnyOf(UseExact("sign", "-"), UseExact("sign", "+"))),
+        UseNumber("value"),
+    ]
 
     @property
     def value(self) -> T.Union[int, float]:
         return self.tokens["value"]
 
     @validate()
-    def validate_for_type(self):
+    def validate_for_type(self) -> None:
-        type = self.parent.value_type
+        expected_type = self.context[ValueTypeCtx].value_type
-        if isinstance(type, gir.IntType):
+        if isinstance(expected_type, gir.IntType):
             try:
                 int(self.tokens["value"])
             except:
@@ -143,7 +160,7 @@ class NumberValue(Value):
                     f"Cannot convert {self.group.tokens['value']} to integer"
                 )
 
-        elif isinstance(type, gir.UIntType):
+        elif isinstance(expected_type, gir.UIntType):
             try:
                 int(self.tokens["value"])
                 if int(self.tokens["value"]) < 0:
@@ -153,7 +170,7 @@ class NumberValue(Value):
                     f"Cannot convert {self.group.tokens['value']} to unsigned integer"
                 )
 
-        elif isinstance(type, gir.FloatType):
+        elif isinstance(expected_type, gir.FloatType):
             try:
                 float(self.tokens["value"])
             except:
@@ -161,8 +178,8 @@ class NumberValue(Value):
                     f"Cannot convert {self.group.tokens['value']} to float"
                 )
 
-        elif type is not None:
+        elif expected_type is not None:
-            raise CompileError(f"Cannot convert number to {type.full_name}")
+            raise CompileError(f"Cannot convert number to {expected_type.full_name}")
 
 
 class Flag(AstNode):
@@ -174,17 +191,17 @@ class Flag(AstNode):
 
     @property
     def value(self) -> T.Optional[int]:
-        type = self.parent.parent.value_type
+        type = self.context[ValueTypeCtx].value_type
         if not isinstance(type, Enumeration):
             return None
-        elif member := type.members.get(self.tokens["value"]):
+        elif member := type.members.get(self.name):
             return member.value
         else:
             return None
 
     @docs()
     def docs(self):
-        type = self.parent.parent.value_type
+        type = self.context[ValueTypeCtx].value_type
         if not isinstance(type, Enumeration):
             return
         if member := type.members.get(self.tokens["value"]):
@@ -192,15 +209,18 @@ class Flag(AstNode):
 
     @validate()
     def validate_for_type(self):
-        type = self.parent.parent.value_type
+        expected_type = self.context[ValueTypeCtx].value_type
-        if isinstance(type, gir.Bitfield) and self.tokens["value"] not in type.members:
+        if (
+            isinstance(expected_type, gir.Bitfield)
+            and self.tokens["value"] not in expected_type.members
+        ):
             raise CompileError(
-                f"{self.tokens['value']} is not a member of {type.full_name}",
+                f"{self.tokens['value']} is not a member of {expected_type.full_name}",
-                did_you_mean=(self.tokens["value"], type.members.keys()),
+                did_you_mean=(self.tokens["value"], expected_type.members.keys()),
             )
 
 
-class FlagsValue(Value):
+class Flags(AstNode):
     grammar = [Flag, "|", Delimited(Flag, "|")]
 
     @property
@@ -208,57 +228,104 @@ class FlagsValue(Value):
         return self.children
 
     @validate()
-    def parent_is_bitfield(self):
+    def validate_for_type(self) -> None:
-        type = self.parent.value_type
+        expected_type = self.context[ValueTypeCtx].value_type
-        if type is not None and not isinstance(type, gir.Bitfield):
+        if expected_type is not None and not isinstance(expected_type, gir.Bitfield):
-            raise CompileError(f"{type.full_name} is not a bitfield type")
+            raise CompileError(f"{expected_type.full_name} is not a bitfield type")
 
 
-class IdentValue(Value):
+class IdentLiteral(AstNode):
     grammar = UseIdent("value")
 
+    @property
+    def ident(self) -> str:
+        return self.tokens["value"]
+
     @validate()
-    def validate_for_type(self):
+    def validate_for_type(self) -> None:
-        type = self.parent.value_type
+        expected_type = self.context[ValueTypeCtx].value_type
+        if isinstance(expected_type, gir.BoolType):
+            if self.ident not in ["true", "false"]:
+                raise CompileError(f"Expected 'true' or 'false' for boolean value")
 
-        if isinstance(type, gir.Enumeration):
+        elif isinstance(expected_type, gir.Enumeration):
-            if self.tokens["value"] not in type.members:
+            if self.ident not in expected_type.members:
                 raise CompileError(
-                    f"{self.tokens['value']} is not a member of {type.full_name}",
+                    f"{self.ident} is not a member of {expected_type.full_name}",
-                    did_you_mean=(self.tokens["value"], type.members.keys()),
+                    did_you_mean=(self.ident, list(expected_type.members.keys())),
                 )
 
-        elif isinstance(type, gir.BoolType):
+        elif expected_type is not None:
-            if self.tokens["value"] not in ["true", "false"]:
+            object = self.root.objects_by_id.get(self.ident)
-                raise CompileError(
-                    f"Expected 'true' or 'false' for boolean value",
-                    did_you_mean=(self.tokens["value"], ["true", "false"]),
-                )
-
-        elif type is not None:
-            object = self.root.objects_by_id.get(self.tokens["value"])
             if object is None:
                 raise CompileError(
-                    f"Could not find object with ID {self.tokens['value']}",
+                    f"Could not find object with ID {self.ident}",
-                    did_you_mean=(self.tokens["value"], self.root.objects_by_id.keys()),
+                    did_you_mean=(self.ident, self.root.objects_by_id.keys()),
                 )
-            elif object.gir_class and not object.gir_class.assignable_to(type):
+            elif object.gir_class and not object.gir_class.assignable_to(expected_type):
                 raise CompileError(
-                    f"Cannot assign {object.gir_class.full_name} to {type.full_name}"
+                    f"Cannot assign {object.gir_class.full_name} to {expected_type.full_name}"
                 )
 
     @docs()
-    def docs(self):
+    def docs(self) -> T.Optional[str]:
-        type = self.parent.value_type
+        type = self.context[ValueTypeCtx].value_type
         if isinstance(type, gir.Enumeration):
-            if member := type.members.get(self.tokens["value"]):
+            if member := type.members.get(self.ident):
                 return member.doc
             else:
                 return type.doc
         elif isinstance(type, gir.GirNode):
             return type.doc
+        else:
+            return None
 
     def get_semantic_tokens(self) -> T.Iterator[SemanticToken]:
         if isinstance(self.parent.value_type, gir.Enumeration):
             token = self.group.tokens["value"]
             yield SemanticToken(token.start, token.end, SemanticTokenType.EnumMember)
+
+
+class Literal(AstNode):
+    grammar = AnyOf(
+        TypeLiteral,
+        QuotedLiteral,
+        NumberLiteral,
+        IdentLiteral,
+    )
+
+    @property
+    def value(
+        self,
+    ) -> T.Union[TypeLiteral, QuotedLiteral, NumberLiteral, IdentLiteral]:
+        return self.children[0]
+
+
+class ObjectValue(AstNode):
+    grammar = Object
+
+    @property
+    def object(self) -> Object:
+        return self.children[Object][0]
+
+    @validate()
+    def validate_for_type(self) -> None:
+        expected_type = self.context[ValueTypeCtx].value_type
+        if (
+            expected_type is not None
+            and self.object.gir_class is not None
+            and not self.object.gir_class.assignable_to(expected_type)
+        ):
+            raise CompileError(
+                f"Cannot assign {self.object.gir_class.full_name} to {expected_type.full_name}"
+            )
+
+
+class Value(AstNode):
+    grammar = AnyOf(PropertyBinding, Binding, Translated, ObjectValue, Flags, Literal)
+
+    @property
+    def child(
+        self,
+    ) -> T.Union[PropertyBinding, Binding, Translated, ObjectValue, Flags, Literal,]:
+        return self.children[0]

blueprintcompiler/outputs/xml/__init__.py

@@ -82,51 +82,57 @@ class XmlOutput(OutputFormat):
         xml.end_tag()
 
     def _emit_property(self, property: Property, xml: XmlEmitter):
-        values = property.children[Value]
+        value = property.value
-        value = values[0] if len(values) == 1 else None
+        child = value.child
 
-        bind_flags = []
+        props: T.Dict[str, T.Optional[str]] = {
-        if property.tokens["bind_source"] and not property.tokens["no_sync_create"]:
+            "name": property.name,
-            bind_flags.append("sync-create")
-        if property.tokens["inverted"]:
-            bind_flags.append("invert-boolean")
-        if property.tokens["bidirectional"]:
-            bind_flags.append("bidirectional")
-        bind_flags_str = "|".join(bind_flags) or None
-
-        props = {
-            "name": property.tokens["name"],
-            "bind-source": property.tokens["bind_source"],
-            "bind-property": property.tokens["bind_property"],
-            "bind-flags": bind_flags_str,
         }
 
-        if isinstance(value, TranslatedStringValue):
+        if isinstance(child, Translated):
-            xml.start_tag("property", **props, **self._translated_string_attrs(value))
+            xml.start_tag("property", **props, **self._translated_string_attrs(child))
-            xml.put_text(value.string)
+            xml.put_text(child.child.string)
             xml.end_tag()
-        elif len(property.children[Object]) == 1:
+        elif isinstance(child, Object):
             xml.start_tag("property", **props)
-            self._emit_object(property.children[Object][0], xml)
+            self._emit_object(child, xml)
             xml.end_tag()
-        elif value is None:
+        elif isinstance(child, Binding):
-            if property.tokens["binding"]:
+            if simple := child.simple_binding:
-                xml.start_tag("binding", **props)
+                props["bind-source"] = simple.source
-                self._emit_expression(property.children[ExprChain][0], xml)
+                props["bind-property"] = simple.property_name
-                xml.end_tag()
+                props["bind-flags"] = "sync-create"
-            else:
                 xml.put_self_closing("property", **props)
+            else:
+                xml.start_tag("binding", **props)
+                self._emit_expression(child.expression, xml)
+                xml.end_tag()
+        elif isinstance(child, PropertyBinding):
+            bind_flags = []
+            if not child.no_sync_create:
+                bind_flags.append("sync-create")
+            if child.inverted:
+                bind_flags.append("invert-boolean")
+            if child.bidirectional:
+                bind_flags.append("bidirectional")
+
+            props["bind-source"] = child.source
+            props["bind-property"] = child.property_name
+            props["bind-flags"] = "|".join(bind_flags) or None
+            xml.put_self_closing("property", **props)
         else:
             xml.start_tag("property", **props)
             self._emit_value(value, xml)
             xml.end_tag()
 
     def _translated_string_attrs(
-        self, translated: TranslatedStringValue
+        self, translated: Translated
     ) -> T.Dict[str, T.Optional[str]]:
         return {
             "translatable": "true",
-            "context": translated.context,
+            "context": translated.child.context
+            if isinstance(translated.child, TranslatedWithContext)
+            else None,
         }
 
     def _emit_signal(self, signal: Signal, xml: XmlEmitter):
@@ -154,23 +160,30 @@ class XmlOutput(OutputFormat):
         xml.end_tag()
 
     def _emit_value(self, value: Value, xml: XmlEmitter):
-        if isinstance(value, IdentValue):
+        if isinstance(value.child, Literal):
-            if isinstance(value.parent.value_type, gir.Enumeration):
+            literal = value.child.value
-                xml.put_text(
+            if isinstance(literal, IdentLiteral):
-                    str(value.parent.value_type.members[value.tokens["value"]].value)
+                value_type = value.context[ValueTypeCtx].value_type
-                )
+                if isinstance(value_type, gir.BoolType):
+                    xml.put_text(literal.ident)
+                elif isinstance(value_type, gir.Enumeration):
+                    xml.put_text(str(value_type.members[literal.ident].value))
+                else:
+                    xml.put_text(literal.ident)
+            elif isinstance(literal, TypeLiteral):
+                xml.put_text(literal.type_name.glib_type_name)
             else:
-                xml.put_text(value.tokens["value"])
+                xml.put_text(literal.value)
-        elif isinstance(value, QuotedValue) or isinstance(value, NumberValue):
+        elif isinstance(value.child, Flags):
-            xml.put_text(value.value)
-        elif isinstance(value, FlagsValue):
             xml.put_text(
-                "|".join([str(flag.value or flag.name) for flag in value.flags])
+                "|".join([str(flag.value or flag.name) for flag in value.child.flags])
             )
-        elif isinstance(value, TranslatedStringValue):
+        elif isinstance(value.child, Translated):
             raise CompilerBugError("translated values must be handled in the parent")
-        elif isinstance(value, TypeValue):
+        elif isinstance(value.child, TypeLiteral):
-            xml.put_text(value.type_name.glib_type_name)
+            xml.put_text(value.child.type_name.glib_type_name)
+        elif isinstance(value.child, ObjectValue):
+            self._emit_object(value.child.object, xml)
         else:
             raise CompilerBugError()
 
@@ -215,9 +228,9 @@ class XmlOutput(OutputFormat):
     ):
         attrs = {attr: name}
 
-        if isinstance(value, TranslatedStringValue):
+        if isinstance(value.child, Translated):
-            xml.start_tag(tag, **attrs, **self._translated_string_attrs(value))
+            xml.start_tag(tag, **attrs, **self._translated_string_attrs(value.child))
-            xml.put_text(value.string)
+            xml.put_text(value.child.child.string)
             xml.end_tag()
         else:
             xml.start_tag(tag, **attrs)
@@ -227,43 +240,37 @@ class XmlOutput(OutputFormat):
     def _emit_extensions(self, extension, xml: XmlEmitter):
         if isinstance(extension, A11y):
             xml.start_tag("accessibility")
-            for child in extension.children:
+            for prop in extension.properties:
-                self._emit_attribute(
+                self._emit_attribute(prop.tag_name, "name", prop.name, prop.value, xml)
-                    child.tag_name, "name", child.name, child.children[Value][0], xml
-                )
             xml.end_tag()
 
         elif isinstance(extension, Filters):
             xml.start_tag(extension.tokens["tag_name"])
-            for child in extension.children:
+            for prop in extension.children:
-                xml.start_tag(child.tokens["tag_name"])
+                xml.start_tag(prop.tokens["tag_name"])
-                xml.put_text(child.tokens["name"])
+                xml.put_text(prop.tokens["name"])
                 xml.end_tag()
             xml.end_tag()
 
         elif isinstance(extension, Items):
             xml.start_tag("items")
-            for child in extension.children:
+            for prop in extension.children:
-                self._emit_attribute(
+                self._emit_attribute("item", "id", prop.name, prop.value, xml)
-                    "item", "id", child.name, child.children[Value][0], xml
-                )
             xml.end_tag()
 
         elif isinstance(extension, Layout):
             xml.start_tag("layout")
-            for child in extension.children:
+            for prop in extension.children:
-                self._emit_attribute(
+                self._emit_attribute("property", "name", prop.name, prop.value, xml)
-                    "property", "name", child.name, child.children[Value][0], xml
-                )
             xml.end_tag()
 
         elif isinstance(extension, Strings):
             xml.start_tag("items")
-            for child in extension.children:
+            for prop in extension.children:
-                value = child.children[Value][0]
+                value = prop.children[Value][0]
-                if isinstance(value, TranslatedStringValue):
+                if isinstance(value.child, Translated):
                     xml.start_tag("item", **self._translated_string_attrs(value))
-                    xml.put_text(value.string)
+                    xml.put_text(value.child.child.string)
                     xml.end_tag()
                 else:
                     xml.start_tag("item")
@@ -273,14 +280,14 @@ class XmlOutput(OutputFormat):
 
         elif isinstance(extension, Styles):
             xml.start_tag("style")
-            for child in extension.children:
+            for prop in extension.children:
-                xml.put_self_closing("class", name=child.tokens["name"])
+                xml.put_self_closing("class", name=prop.tokens["name"])
             xml.end_tag()
 
         elif isinstance(extension, Widgets):
             xml.start_tag("widgets")
-            for child in extension.children:
+            for prop in extension.children:
-                xml.put_self_closing("widget", name=child.tokens["name"])
+                xml.put_self_closing("widget", name=prop.tokens["name"])
             xml.end_tag()
 
         else:

blueprintcompiler/parse_tree.py

@@ -567,6 +567,19 @@ class UseLiteral(ParseNode):
         return True
 
 
+class UseExact(ParseNode):
+    """Matches the given identifier and sets it as a named token."""
+
+    def __init__(self, key: str, string: str):
+        self.key = key
+        self.string = string
+
+    def _parse(self, ctx: ParseContext):
+        token = ctx.next_token()
+        ctx.set_group_val(self.key, self.string, token)
+        return str(token) == self.string
+
+
 class Keyword(ParseNode):
     """Matches the given identifier and sets it as a named token, with the name
     being the identifier itself."""

blueprintcompiler/parser.py

@@ -21,7 +21,7 @@
 from .errors import MultipleErrors, PrintableError
 from .parse_tree import *
 from .tokenizer import TokenType
-from .language import OBJECT_CONTENT_HOOKS, VALUE_HOOKS, Template, UI
+from .language import OBJECT_CONTENT_HOOKS, Template, UI
 
 
 def parse(

tests/sample_errors/obj_prop_type.err

@@ -1 +1 @@
-4,3,21,Cannot assign Gtk.Label to Gtk.Adjustment
+4,15,8,Cannot assign Gtk.Label to Gtk.Adjustment

tests/sample_errors/warn_old_bind.err

@@ -0,0 +1,2 @@
+4,12,4,Use 'bind-property', introduced in blueprint 0.8.0, to use binding flags
+6,12,4,Use 'bind-property', introduced in blueprint 0.8.0, to use binding flags

tests/samples/property_binding.blp

@@ -0,0 +1,11 @@
+using Gtk 4.0;
+
+Box {
+  visible: bind-property box2.visible inverted;
+  orientation: bind box2.orientation;
+  spacing: bind-property box2.spacing no-sync-create;
+}
+
+Box box2 {
+  spacing: 6;
+}

tests/samples/property_binding_dec.blp

@@ -0,0 +1,11 @@
+using Gtk 4.0;
+
+Box {
+  visible: bind-property box2.visible inverted;
+  orientation: bind-property box2.orientation;
+  spacing: bind-property box2.spacing no-sync-create;
+}
+
+Box box2 {
+  spacing: 6;
+}

tests/test_samples.py

@@ -145,7 +145,6 @@ class TestSamples(unittest.TestCase):
     def test_samples(self):
         self.assert_sample("accessibility")
         self.assert_sample("action_widgets")
-        self.assert_sample("binding")
         self.assert_sample("child_type")
         self.assert_sample("combo_box_text")
         self.assert_sample("comments")
@@ -163,6 +162,7 @@ class TestSamples(unittest.TestCase):
             "parseable", skip_run=True
         )  # The image resource doesn't exist
         self.assert_sample("property")
+        self.assert_sample("property_binding")
         self.assert_sample("signal", skip_run=True)  # The callback doesn't exist
         self.assert_sample("size_group")
         self.assert_sample("string_list")
@@ -235,12 +235,12 @@ class TestSamples(unittest.TestCase):
         self.assert_sample_error("two_templates")
         self.assert_sample_error("uint")
         self.assert_sample_error("using_invalid_namespace")
+        self.assert_sample_error("warn_old_bind")
         self.assert_sample_error("warn_old_extern")
         self.assert_sample_error("widgets_in_non_size_group")
 
     def test_decompiler(self):
         self.assert_decompile("accessibility_dec")
-        self.assert_decompile("binding")
         self.assert_decompile("child_type")
         self.assert_decompile("file_filter")
         self.assert_decompile("flags")
@@ -248,6 +248,7 @@ class TestSamples(unittest.TestCase):
         self.assert_decompile("layout_dec")
         self.assert_decompile("menu_dec")
         self.assert_decompile("property")
+        self.assert_decompile("property_binding_dec")
         self.assert_decompile("placeholder_dec")
         self.assert_decompile("signal")
         self.assert_decompile("strings")