Create ast package

smnp/ast/parsers/colon.py

@@ -0,0 +1,19 @@
+from smnp.ast.node.colon import ColonNode
+from smnp.error.syntax import SyntaxException
+from smnp.token.type import TokenType
+
+
+# colon -> expr ':' expr
+def parseColon(expr1, input, parent):
+    if input.hasCurrent() and input.current().type == TokenType.COLON:
+        token = input.current()
+        input.ahead()
+        expr2 = parseExpression(input, parent)
+
+        if expr2 is None:
+            raise SyntaxException(input.current().pos, f"Expected expression '{input.current().value}'")
+        colon = ColonNode(expr1, expr2, parent, token.pos)
+        expr1.parent = colon
+        expr2.parent = colon
+        return colon
+    return None