Add 'throw' statement

smnp/ast/node/throw.py

@@ -0,0 +1,17 @@
+from smnp.ast.node.expression import ExpressionParser
+from smnp.ast.node.valuable import Valuable
+from smnp.ast.parser import Parser
+from smnp.token.type import TokenType
+
+
+class Throw(Valuable):
+    pass
+
+
+def ThrowParser(input):
+    return Parser.allOf(
+        Parser.terminal(TokenType.THROW),
+        Parser.doAssert(ExpressionParser, "error message as string"),
+        createNode=lambda throw, message: Throw.withValue(message, throw.pos),
+        name="throw"
+    )(input)