implement variant parsing

blueprintcompiler/language/gtk_menu.py

@@ -137,7 +137,10 @@ menu_attribute = Group(
     [
         UseIdent("name"),
         ":",
-        Err(AnyOf(StringValue, VariantValue), "Expected string or translated string"),
+        Err(
+            AnyOf(StringValue, VariantValue),
+            "Expected string, translated string, or variant",
+        ),
         Match(";").expected(),
     ],
 )

blueprintcompiler/language/values.py

@@ -26,6 +26,7 @@ from .common import *
 from .contexts import ScopeCtx, ValueTypeCtx
 from .gobject_object import Object
 from .types import TypeName
+from .variant import VarContent
 
 
 class Translated(AstNode):
@@ -373,7 +374,7 @@ class IdentLiteral(AstNode):
 
 
 class VariantValue(AstNode):
-    grammar = ["variant", "<", UseQuoted("type"), ">", "(", UseQuoted("value"), ")"]
+    grammar = ["variant", "<", UseQuoted("type"), ">", "(", VarContent, ")"]
 
     @property
     def var_type(self) -> str:
@@ -381,7 +382,7 @@ class VariantValue(AstNode):
 
     @property
     def var_value(self) -> str:
-        return self.tokens["value"]
+        return self.children[0].content
 
     @validate()
     def validate_for_type(self) -> None:

blueprintcompiler/language/variant.py

@@ -0,0 +1,119 @@
+import typing as T
+
+from blueprintcompiler.gir import ArrayType
+from blueprintcompiler.lsp_utils import SemanticToken
+
+from .common import *
+from .contexts import ScopeCtx, ValueTypeCtx
+from .gobject_object import Object
+from .types import TypeName
+
+VAR_CONTENT_HOOKS = []
+
+
+class VarContent(AstNode):
+    grammar = AnyOf(*VAR_CONTENT_HOOKS)
+
+    @property
+    def content(self) -> str:
+        return self.children[0].content
+
+
+class VarContentBool(AstNode):
+    grammar = AnyOf(
+        [Keyword("true"), UseLiteral("value", True)],
+        [Keyword("false"), UseLiteral("value", False)],
+    )
+
+    @property
+    def content(self) -> str:
+        if self.tokens["value"]:
+            return "true"
+        else:
+            return "false"
+
+
+class VarContentString(AstNode):
+    grammar = UseQuoted("value")
+
+    @property
+    def content(self) -> str:
+        return self.tokens["value"]
+
+
+class VarContentNumber(AstNode):
+    grammar = UseNumberText("value")
+
+    @property
+    def content(self) -> str:
+        return self.tokens["value"]
+
+
+class VarContentTuple(AstNode):
+    grammar = ["(", Delimited(VarContent, ","), ")"]
+
+    @property
+    def content(self) -> str:
+        inner = ", ".join(child.content for child in self.children)
+        return f"({inner})"
+
+
+class VarContentArray(AstNode):
+    grammar = ["[", Delimited(VarContent, ","), "]"]
+
+    @property
+    def content(self) -> str:
+        inner = ", ".join(child.content for child in self.children)
+        return f"[{inner}]"
+
+
+class VarContentDictEntry(AstNode):
+    grammar = ["{", VarContent, ",", VarContent, "}"]
+
+    @property
+    def content(self):
+        return f"{{{self.children[0].content}, {self.children[1].content}}}"
+
+
+class VarContentDict(AstNode):
+    grammar = ["{", Delimited([VarContent, ":", VarContent], ","), "}"]
+
+    @property
+    def content(self) -> str:
+        inner = ", ".join(child.content for child in self.children)
+        return f"{{{inner}}}"
+
+
+class VarContentVariant(AstNode):
+    grammar = ["<", VarContent, ">"]
+
+    @property
+    def content(self) -> str:
+        return f"<{self.children[0].content}>"
+
+
+class VarContentMaybe(AstNode):
+    grammar = AnyOf(
+        [Keyword("just"), VarContent],
+        [Keyword("nothing")],
+    )
+
+    @property
+    def content(self) -> str:
+        if self.children[0] is not None:
+            return f"just {self.children[0].content}"
+        else:
+            return "nothing"
+
+
+VarContent.grammar.children = [
+    VarContentString,
+    VarContentNumber,
+    VarContentBool,
+    VarContentMaybe,
+    VarContentTuple,
+    VarContentDict,
+    VarContentDictEntry,
+    VarContentArray,
+    VarContentVariant,
+]

variant-test.blp

@@ -1,16 +1,16 @@
 using Gtk 4.0;
 
-menu root {
-  submenu {
-    name: "one";
-    item {
-      action: "app.foo_bar";
-      target: variant<"s">("\"one\"");
-    }
-  }
-}
-
-Button {
-  action-name: "app.shave_yak";
-  action-target: variant<"y">("8");
+$BlueprintTestObject {
+  // test-one: variant<"s">("one");
+  test-zero: variant<"b">(true);
+  test-one: variant<"s">("one");
+  test-two: variant<"i">(2);
+  test-three: variant<"(ii)">((3, 4));
+  test-four: variant<"ai">([5, 6]);
+  test-five: variant<"{sv}">({"key", <"value">});
+  test-six: variant<"a{ss}">({
+    "GLib": "2.24",
+    "Gtk": "4.16"
+  });
+  test-seven: variant<"ams">([just "2", nothing]);
 }