1 files changed, 52 insertions, 0 deletions
diff --git a/mesonbuild/interpreter/primitives/boolean.py b/mesonbuild/interpreter/primitives/boolean.py
new file mode 100644
index 0000000..4b49caf
--- /dev/null
+++ b/mesonbuild/interpreter/primitives/boolean.py
@@ -0,0 +1,52 @@
+# Copyright 2021 The Meson development team
+# SPDX-license-identifier: Apache-2.0
+from __future__ import annotations
+
+from ...interpreterbase import (
+    ObjectHolder,
+    MesonOperator,
+    typed_pos_args,
+    noKwargs,
+    noPosargs,
+
+    InvalidArguments
+)
+
+import typing as T
+
+if T.TYPE_CHECKING:
+    # Object holders need the actual interpreter
+    from ...interpreter import Interpreter
+    from ...interpreterbase import TYPE_var, TYPE_kwargs
+
+class BooleanHolder(ObjectHolder[bool]):
+    def __init__(self, obj: bool, interpreter: 'Interpreter') -> None:
+        super().__init__(obj, interpreter)
+        self.methods.update({
+            'to_int': self.to_int_method,
+            'to_string': self.to_string_method,
+        })
+
+        self.trivial_operators.update({
+            MesonOperator.BOOL: (None, lambda x: self.held_object),
+            MesonOperator.NOT: (None, lambda x: not self.held_object),
+            MesonOperator.EQUALS: (bool, lambda x: self.held_object == x),
+            MesonOperator.NOT_EQUALS: (bool, lambda x: self.held_object != x),
+        })
+
+    def display_name(self) -> str:
+        return 'bool'
+
+    @noKwargs
+    @noPosargs
+    def to_int_method(self, args: T.List[TYPE_var], kwargs: TYPE_kwargs) -> int:
+        return 1 if self.held_object else 0
+
+    @noKwargs
+    @typed_pos_args('bool.to_string', optargs=[str, str])
+    def to_string_method(self, args: T.Tuple[T.Optional[str], T.Optional[str]], kwargs: TYPE_kwargs) -> str:
+        true_str = args[0] or 'true'
+        false_str = args[1] or 'false'
+        if any(x is not None for x in args) and not all(x is not None for x in args):
+            raise InvalidArguments('bool.to_string() must have either no arguments or exactly two string arguments that signify what values to return for true and false.')
+        return true_str if self.held_object else false_str