Add lambda expressions

blueprintcompiler/completions.py

@@ -137,10 +137,10 @@ def prop_value_completer(ast_node, match_variables):
 def signal_completer(ast_node, match_variables):
     if ast_node.gir_class:
         for signal in ast_node.gir_class.signals:
-            if not isinstance(ast_node.parent, language.Object):
-                name = "on"
+            if isinstance(ast_node.parent, language.Object):
+                name = "on_" + (ast_node.parent.tokens["id"] or ast_node.parent.children[language.types.ClassName][0].tokens["class_name"].lower())
             else:
-                name = "on_" + (ast_node.parent.tokens["id"] or ast_node.parent.tokens["class_name"].lower())
+                name = "on"
             yield Completion(signal, CompletionItemKind.Property, snippet=f"{signal} => ${{1:{name}_{signal.replace('-', '_')}}}()$0;")
 
 

blueprintcompiler/gir.py

@@ -487,7 +487,7 @@ class GirContext:
             )
 
 
-    def validate_class(self, name: str, ns: str):
+    def validate_type(self, name: str, ns: str):
         """ Raises an exception if there is a problem looking up the given
         class (it doesn't exist, it isn't a class, etc.) """
 
@@ -498,12 +498,7 @@ class GirContext:
 
         if type is None:
             raise CompileError(
-                f"Namespace {ns} does not contain a class called {name}",
-                did_you_mean=(name, self.namespaces[ns].classes.keys()),
-            )
-        elif not isinstance(type, Class):
-            raise CompileError(
-                f"{ns}.{name} is not a class",
+                f"Namespace {ns} does not contain a type called {name}",
                 did_you_mean=(name, self.namespaces[ns].classes.keys()),
             )
 

blueprintcompiler/language/__init__.py

@@ -16,6 +16,7 @@ from .gtk_string_list import Strings
 from .gtk_styles import Styles
 from .gtkbuilder_child import Child
 from .gtkbuilder_template import Template
+from .lambdas import Lambda
 from .imports import GtkDirective, Import
 from .ui import UI
 from .values import IdentValue, TranslatedStringValue, FlagsValue, LiteralValue
@@ -47,4 +48,5 @@ VALUE_HOOKS.children = [
     FlagsValue,
     IdentValue,
     LiteralValue,
+    Lambda,
 ]

blueprintcompiler/language/common.py

@@ -17,7 +17,6 @@
 #
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
-
 from .. import gir
 from ..ast_utils import AstNode, validate, docs
 from ..errors import CompileError, MultipleErrors
@@ -27,10 +26,29 @@ from ..decompiler import DecompileCtx, decompiler
 from ..gir import StringType, BoolType, IntType, FloatType, GirType, Enumeration
 from ..lsp_utils import Completion, CompletionItemKind, SemanticToken, SemanticTokenType
 from ..parse_tree import *
-from ..parser_utils import *
 from ..xml_emitter import XmlEmitter
 
 
 OBJECT_HOOKS = AnyOf()
 OBJECT_CONTENT_HOOKS = AnyOf()
 VALUE_HOOKS = AnyOf()
+
+
+class Scope:
+    def get_variables(self) -> T.Iterator[str]:
+        yield from self.get_objects().keys()
+
+    def get_objects(self) -> T.Dict[str, T.Any]:
+        raise NotImplementedError()
+
+    @property
+    def this_name(self) -> T.Optional[str]:
+        return None
+
+    @property
+    def this_type(self) -> T.Optional[str]:
+        return None
+
+    @property
+    def this_type_glib_name(self) -> T.Optional[str]:
+        return None

blueprintcompiler/language/expression.py

@@ -41,7 +41,14 @@ class InfixExpr(AstNode):
 class IdentExpr(AstNode):
     grammar = UseIdent("ident")
 
+    @property
+    def is_this(self):
+        return self.parent_by_type(Scope).this_name == self.tokens["ident"]
+
     def emit_xml(self, xml: XmlEmitter):
+        if self.is_this:
+            raise CompilerBugError()
+
         xml.start_tag("constant")
         xml.put_text(self.tokens["ident"])
         xml.end_tag()
@@ -51,9 +58,13 @@ class LookupOp(InfixExpr):
     grammar = [".", UseIdent("property")]
 
     def emit_xml(self, xml: XmlEmitter):
-        xml.start_tag("lookup", name=self.tokens["property"])
-        self.lhs.emit_xml(xml)
-        xml.end_tag()
+        if isinstance(self.lhs, IdentExpr) and self.lhs.is_this:
+            xml.put_self_closing("lookup", name=self.tokens["property"], type=self.parent_by_type(Scope).this_type)
+        else:
+            xml.start_tag("lookup", name=self.tokens["property"])
+            self.lhs.emit_xml(xml)
+            xml.end_tag()
+
 
 
 expr.children = [

blueprintcompiler/language/gobject_object.py

@@ -21,6 +21,7 @@
 import typing as T
 from functools import cached_property
 
+from .types import ConcreteClassName, ClassName
 from .common import *
 from .response_id import ResponseId
 
@@ -46,29 +47,11 @@ class ObjectContent(AstNode):
 
 class Object(AstNode):
     grammar: T.Any = [
-        class_name,
+        ConcreteClassName,
         Optional(UseIdent("id")),
         ObjectContent,
     ]
 
-    @validate("namespace")
-    def gir_ns_exists(self):
-        if not self.tokens["ignore_gir"]:
-            self.root.gir.validate_ns(self.tokens["namespace"])
-
-    @validate("class_name")
-    def gir_class_exists(self):
-        if self.tokens["class_name"] and not self.tokens["ignore_gir"] and self.gir_ns is not None:
-            self.root.gir.validate_class(self.tokens["class_name"], self.tokens["namespace"])
-
-    @validate("namespace", "class_name")
-    def not_abstract(self):
-        if self.gir_class is not None and self.gir_class.abstract:
-            raise CompileError(
-                f"{self.gir_class.full_name} can't be instantiated because it's abstract",
-                hints=[f"did you mean to use a subclass of {self.gir_class.full_name}?"]
-            )
-
     @property
     def gir_ns(self):
         if not self.tokens["ignore_gir"]:
@@ -76,9 +59,11 @@ class Object(AstNode):
 
     @property
     def gir_class(self):
-        if self.tokens["class_name"] and not self.tokens["ignore_gir"]:
-            return self.root.gir.get_class(self.tokens["class_name"], self.tokens["namespace"])
-
+        class_names = self.children[ClassName]
+        if len(class_names) == 0:
+            return None
+        else:
+            return class_names[0].gir_type
 
     @docs("namespace")
     def namespace_docs(self):
@@ -109,7 +94,7 @@ class Object(AstNode):
         from .gtkbuilder_child import Child
 
         xml.start_tag("object", **{
-            "class": self.gir_class or self.tokens["class_name"],
+            "class": self.children[ClassName][0].glib_type_name,
             "id": self.tokens["id"],
         })
         for child in self.children:

blueprintcompiler/language/gtkbuilder_template.py

@@ -18,6 +18,7 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
 
+from .types import ClassName
 from .gobject_object import Object, ObjectContent
 from .common import *
 
@@ -27,8 +28,8 @@ class Template(Object):
         "template",
         UseIdent("name").expected("template class name"),
         Optional([
-            Match(":"),
-            class_name.expected("parent class"),
+            ":",
+            to_parse_node(ClassName).expected("parent class"),
         ]),
         ObjectContent,
     ]
@@ -38,10 +39,14 @@ class Template(Object):
         pass # does not apply to templates
 
     def emit_xml(self, xml: XmlEmitter):
+        parent = None
+        if len(self.children[ClassName]):
+            parent = self.children[ClassName][0].glib_type_name
+
         xml.start_tag(
             "template",
             **{"class": self.tokens["name"]},
-            parent=self.gir_class or self.tokens["class_name"]
+            parent=parent,
         )
         for child in self.children:
             child.emit_xml(xml)

blueprintcompiler/language/lambdas.py

@@ -0,0 +1,53 @@
+# lambdas.py
+#
+# Copyright 2022 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 .types import TypeName
+from .expression import Expr
+from .values import Value
+from .common import *
+
+
+class Lambda(Value, Scope):
+    grammar = [
+        "(",
+        TypeName,
+        UseIdent("argument"),
+        ")",
+        "=>",
+        Expr,
+    ]
+
+    def emit_xml(self, xml: XmlEmitter):
+        for child in self.children:
+            child.emit_xml(xml)
+
+    def get_objects(self):
+        return {
+            **self.parent.parent_by_type(Scope).get_objects(),
+            self.tokens["argument"]: None,
+        }
+
+    @property
+    def this_name(self) -> str:
+        return self.tokens["argument"]
+
+    @property
+    def this_type(self) -> str:
+        return self.children[TypeName][0].gir_type

blueprintcompiler/language/types.py

@@ -0,0 +1,96 @@
+# types.py
+#
+# Copyright 2022 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 .common import *
+
+
+class TypeName(AstNode):
+    grammar = AnyOf(
+        [
+            UseIdent("namespace"),
+            ".",
+            UseIdent("class_name"),
+        ],
+        [
+            ".",
+            UseIdent("class_name"),
+            UseLiteral("ignore_gir", True),
+        ],
+        UseIdent("class_name"),
+    )
+
+    @validate("class_name")
+    def type_exists(self):
+        if not self.tokens["ignore_gir"] and self.gir_ns is not None:
+            self.root.gir.validate_type(self.tokens["class_name"], self.tokens["namespace"])
+
+    @validate("namespace")
+    def gir_ns_exists(self):
+        if not self.tokens["ignore_gir"]:
+            self.root.gir.validate_ns(self.tokens["namespace"])
+
+    @property
+    def gir_ns(self):
+        if not self.tokens["ignore_gir"]:
+            return self.root.gir.namespaces.get(self.tokens["namespace"] or "Gtk")
+
+    @property
+    def gir_type(self) -> T.Optional[gir.Class]:
+        if self.tokens["class_name"] and not self.tokens["ignore_gir"]:
+            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"]
+
+    @docs("namespace")
+    def namespace_docs(self):
+        if ns := self.root.gir.namespaces.get(self.tokens["namespace"]):
+            return ns.doc
+
+    @docs("class_name")
+    def class_docs(self):
+        if self.gir_type:
+            return self.gir_type.doc
+
+    def emit_xml(self, xml: XmlEmitter):
+        pass
+
+
+class ClassName(TypeName):
+    @validate("class_name")
+    def gir_type_is_class(self):
+        if self.gir_type is not None and not isinstance(self.gir_type, gir.Class):
+            raise CompileError(f"{self.gir_type.full_name} is not a class")
+
+
+class ConcreteClassName(ClassName):
+    @validate("namespace", "class_name")
+    def not_abstract(self):
+        if self.gir_type is not None and self.gir_type.abstract:
+            raise CompileError(
+                f"{self.gir_type.full_name} can't be instantiated because it's abstract",
+                hints=[f"did you mean to use a subclass of {self.gir_type.full_name}?"]
+            )

blueprintcompiler/language/ui.py

@@ -24,7 +24,7 @@ from .gtkbuilder_template import Template
 from .common import *
 
 
-class UI(AstNode):
+class UI(AstNode, Scope):
     """ The AST node for the entire file """
 
     grammar = [
@@ -63,6 +63,10 @@ class UI(AstNode):
         return { obj.tokens["id"]: obj for obj in self.iterate_children_recursive() if obj.tokens["id"] is not None }
 
 
+    def get_objects(self):
+        return self.objects_by_id
+
+
     @validate()
     def gir_errors(self):
         # make sure gir is loaded

blueprintcompiler/parser.py

@@ -20,7 +20,6 @@
 
 from .errors import MultipleErrors, PrintableError
 from .parse_tree import *
-from .parser_utils import *
 from .tokenizer import TokenType
 from .language import OBJECT_HOOKS, OBJECT_CONTENT_HOOKS, VALUE_HOOKS, Template, UI
 

blueprintcompiler/parser_utils.py

@@ -1,36 +0,0 @@
-# parser_utils.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
-
-
-from .parse_tree import *
-
-
-class_name = AnyOf(
-    [
-        UseIdent("namespace"),
-        ".",
-        UseIdent("class_name"),
-    ],
-    [
-        ".",
-        UseIdent("class_name"),
-        UseLiteral("ignore_gir", True),
-    ],
-    UseIdent("class_name"),
-)

tests/sample_errors/class_dne.err

@@ -1 +1 @@
-3,29,13,Namespace Gtk does not contain a class called NotARealClass
+3,29,13,Namespace Gtk does not contain a type called NotARealClass

tests/samples/lambda.blp

@@ -0,0 +1,9 @@
+using Gtk 4.0;
+
+Gtk.BoolFilter filter {
+  expression: (Gtk.Label object) => object.visible;
+}
+
+Gtk.BoolFilter {
+  expression: (Gtk.Label object) => filter.invert;
+}

tests/samples/lambda.ui

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <object class="GtkBoolFilter" id="filter">
+    <property name="expression">
+      <lookup name="visible" type="GtkLabel"/>
+    </property>
+  </object>
+  <object class="GtkBoolFilter">
+    <property name="expression">
+      <lookup name="invert">
+        <constant>filter</constant>
+      </lookup>
+    </property>
+  </object>
+</interface>

tests/samples/template_custom_parent.blp

@@ -0,0 +1,3 @@
+using Gtk 4.0;
+
+template MyWidget : .MyBaseWidget {}

tests/samples/template_custom_parent.ui

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <template class="MyWidget" parent="MyBaseWidget"></template>
+</interface>

tests/test_samples.py

@@ -141,6 +141,7 @@ class TestSamples(unittest.TestCase):
         self.assert_sample("flags")
         self.assert_sample("id_prop")
         self.assert_sample("inline_menu")
+        self.assert_sample("lambda")
         self.assert_sample("layout")
         self.assert_sample("menu")
         self.assert_sample("numbers")
@@ -153,6 +154,7 @@ class TestSamples(unittest.TestCase):
         self.assert_sample("strings")
         self.assert_sample("style")
         self.assert_sample("template")
+        self.assert_sample("template_custom_parent")
         self.assert_sample("template_no_parent")
         self.assert_sample("translated")
         self.assert_sample("uint")