Merge branch 'expr-literal' into 'main'

language: Add expression literals

See merge request jwestman/blueprint-compiler!227

blueprintcompiler/language/__init__.py

@@ -41,7 +41,7 @@ from .types import ClassName
 from .ui import UI
 from .values import (
     ArrayValue,
-    ExprLiteral,
+    ExprValue,
     Flag,
     Flags,
     IdentLiteral,

blueprintcompiler/language/contexts.py

@@ -82,6 +82,6 @@ class ScopeCtx:
 
 
 @dataclass
-class ExprLiteralCtx:
+class ExprValueCtx:
     """Indicates that the context is an expression literal, where the
     "item" keyword may be used."""

blueprintcompiler/language/gobject_property.py

@@ -21,13 +21,12 @@
 from .binding import Binding
 from .common import *
 from .contexts import ValueTypeCtx
-from .gtkbuilder_template import Template
-from .values import ArrayValue, ObjectValue, Value
+from .values import ArrayValue, ExprValue, ObjectValue, Value
 
 
 class Property(AstNode):
     grammar = Statement(
-        UseIdent("name"), ":", AnyOf(Binding, ObjectValue, Value, ArrayValue)
+        UseIdent("name"), ":", AnyOf(Binding, ExprValue, ObjectValue, Value, ArrayValue)
     )
 
     @property
@@ -35,7 +34,7 @@ class Property(AstNode):
         return self.tokens["name"]
 
     @property
-    def value(self) -> T.Union[Binding, ObjectValue, Value, ArrayValue]:
+    def value(self) -> T.Union[Binding, ExprValue, ObjectValue, Value, ArrayValue]:
         return self.children[0]
 
     @property

blueprintcompiler/language/gobject_signal.py

@@ -143,12 +143,13 @@ class Signal(AstNode):
 
     @property
     def document_symbol(self) -> DocumentSymbol:
+        detail = self.ranges["detail_start", "detail_end"]
         return DocumentSymbol(
             self.full_name,
             SymbolKind.Event,
             self.range,
             self.group.tokens["name"].range,
-            self.ranges["detail_start", "detail_end"].text,
+            detail.text if detail is not None else None,
         )
 
     def get_reference(self, idx: int) -> T.Optional[LocationLink]:

blueprintcompiler/language/values.py

@@ -23,7 +23,7 @@ from blueprintcompiler.gir import ArrayType
 from blueprintcompiler.lsp_utils import SemanticToken
 
 from .common import *
-from .contexts import ExprLiteralCtx, ScopeCtx, ValueTypeCtx
+from .contexts import ExprValueCtx, ScopeCtx, ValueTypeCtx
 from .expression import Expression
 from .gobject_object import Object
 from .types import TypeName
@@ -112,35 +112,6 @@ class TypeLiteral(AstNode):
         return get_docs_section("Syntax TypeLiteral")
 
 
-class ExprLiteral(AstNode):
-    grammar = [Keyword("expr"), Expression]
-
-    @property
-    def expression(self) -> Expression:
-        return self.children[Expression][0]
-
-    @validate("expr")
-    def validate_for_type(self) -> None:
-        expected_type = self.parent.context[ValueTypeCtx].value_type
-        expr_type = self.root.gir.get_type("Expression", "Gtk")
-        if expected_type is not None and not expected_type.assignable_to(expr_type):
-            raise CompileError(
-                f"Cannot convert Gtk.Expression to {expected_type.full_name}"
-            )
-
-    @docs("expr")
-    def ref_docs(self):
-        return get_docs_section("Syntax ExprLiteral")
-
-    @context(ExprLiteralCtx)
-    def expr_literal(self):
-        return ExprLiteralCtx()
-
-    @context(ValueTypeCtx)
-    def value_type(self):
-        return ValueTypeCtx(None, must_infer_type=True)
-
-
 class QuotedLiteral(AstNode):
     grammar = UseQuoted("value")
 
@@ -350,7 +321,7 @@ class IdentLiteral(AstNode):
                     if not self.context[ValueTypeCtx].allow_null:
                         raise CompileError("null is not permitted here")
                 elif self.ident == "item":
-                    if not self.context[ExprLiteralCtx]:
+                    if not self.context[ExprValueCtx]:
                         raise CompileError(
                             '"item" can only be used in an expression literal'
                         )
@@ -410,7 +381,6 @@ class IdentLiteral(AstNode):
 class Literal(AstNode):
     grammar = AnyOf(
         TypeLiteral,
-        ExprLiteral,
         QuotedLiteral,
         NumberLiteral,
         IdentLiteral,
@@ -419,7 +389,7 @@ class Literal(AstNode):
     @property
     def value(
         self,
-    ) -> T.Union[TypeLiteral, ExprLiteral, QuotedLiteral, NumberLiteral, IdentLiteral]:
+    ) -> T.Union[TypeLiteral, QuotedLiteral, NumberLiteral, IdentLiteral]:
         return self.children[0]
 
 
@@ -443,6 +413,35 @@ class ObjectValue(AstNode):
             )
 
 
+class ExprValue(AstNode):
+    grammar = [Keyword("expr"), Expression]
+
+    @property
+    def expression(self) -> Expression:
+        return self.children[Expression][0]
+
+    @validate("expr")
+    def validate_for_type(self) -> None:
+        expected_type = self.parent.context[ValueTypeCtx].value_type
+        expr_type = self.root.gir.get_type("Expression", "Gtk")
+        if expected_type is not None and not expected_type.assignable_to(expr_type):
+            raise CompileError(
+                f"Cannot convert Gtk.Expression to {expected_type.full_name}"
+            )
+
+    @docs("expr")
+    def ref_docs(self):
+        return get_docs_section("Syntax ExprValue")
+
+    @context(ExprValueCtx)
+    def expr_literal(self):
+        return ExprValueCtx()
+
+    @context(ValueTypeCtx)
+    def value_type(self):
+        return ValueTypeCtx(None, must_infer_type=True)
+
+
 class Value(AstNode):
     grammar = AnyOf(Translated, Flags, Literal)
 

blueprintcompiler/outputs/xml/__init__.py

@@ -134,6 +134,11 @@ class XmlOutput(OutputFormat):
                 self._emit_expression(value.expression, xml)
                 xml.end_tag()
 
+        elif isinstance(value, ExprValue):
+            xml.start_tag("property", **props)
+            self._emit_expression(value.expression, xml)
+            xml.end_tag()
+
         elif isinstance(value, ObjectValue):
             xml.start_tag("property", **props)
             self._emit_object(value.object, xml)
@@ -205,8 +210,6 @@ class XmlOutput(OutputFormat):
                 xml.put_text(self._object_id(value, value.ident))
         elif isinstance(value, TypeLiteral):
             xml.put_text(value.type_name.glib_type_name)
-        elif isinstance(value, ExprLiteral):
-            self._emit_expression(value.expression, xml)
         else:
             if isinstance(value.value, float) and value.value == int(value.value):
                 xml.put_text(int(value.value))
@@ -220,12 +223,6 @@ class XmlOutput(OutputFormat):
             xml.put_text(
                 "|".join([str(flag.value or flag.name) for flag in value.child.flags])
             )
-        elif isinstance(value.child, Translated):
-            raise CompilerBugError("translated values must be handled in the parent")
-        elif isinstance(value.child, TypeLiteral):
-            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()
 

docs/reference/expressions.rst

@@ -89,14 +89,14 @@ Example
    // Cast the result of the closure so blueprint knows it's a string
    label: bind $format_bytes(template.file-size) as <string>
 
-.. _Syntax ExprLiteral:
+.. _Syntax ExprValue:
 
-Expression Literals
--------------------
+Expression Values
+-----------------
 
 .. rst-class:: grammar-block
 
-   ExprLiteral = 'expr' :ref:`Expression<Syntax Expression>`
+   ExprValue = 'expr' :ref:`Expression<Syntax Expression>`
 
 Some APIs take *an expression itself*--not its result--as a property value. For example, `Gtk.BoolFilter <https://docs.gtk.org/gtk4/class.BoolFilter.html>`_ has an ``expression`` property of type `Gtk.Expression <https://docs.gtk.org/gtk4/class.Expression.html>`_. This expression is evaluated for every item in a list model to determine whether the item should be filtered.
 

docs/reference/objects.rst

@@ -58,7 +58,7 @@ Properties
 
 .. rst-class:: grammar-block
 
-   Property = <name::ref:`IDENT<Syntax IDENT>`> ':' ( :ref:`Binding<Syntax Binding>` | :ref:`ObjectValue<Syntax ObjectValue>` | :ref:`Value<Syntax Value>` ) ';'
+   Property = <name::ref:`IDENT<Syntax IDENT>`> ':' ( :ref:`Binding<Syntax Binding>` | :ref:`ExprValue<Syntax ExprValue>` | :ref:`ObjectValue<Syntax ObjectValue>` | :ref:`Value<Syntax Value>` ) ';'
 
 Properties specify the details of each object, like a label's text, an image's icon name, or the margins on a container.
 

tests/sample_errors/incomplete_signal.blp

@@ -0,0 +1,5 @@
+using Gtk 4.0;
+
+Label {
+  notify::
+}

tests/sample_errors/incomplete_signal.err

@@ -0,0 +1,2 @@
+5,1,0,Expected a signal detail name
+4,9,3,Unexpected tokens

tests/test_samples.py

@@ -198,7 +198,7 @@ class TestSamples(unittest.TestCase):
                 "adw_breakpoint_template",
                 "expr_closure",
                 "expr_closure_args",
-                "expr_literal_closure",
+                "expr_value_closure",
                 "parseable",
                 "signal",
                 "signal_not_swapped",