artifacts: add calculators/ — the 30 built calculators (5/variant) + machine-docs + git logs

calculators/builder-solo/run-03/calc.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+import sys
+from calc.lexer import tokenize, LexError
+from calc.parser import parse, ParseError
+from calc.evaluator import evaluate, EvalError
+
+
+def main():
+    if len(sys.argv) != 2:
+        print("usage: calc.py <expression>", file=sys.stderr)
+        sys.exit(1)
+    expr = sys.argv[1]
+    try:
+        tokens = tokenize(expr)
+        ast = parse(tokens)
+        result = evaluate(ast)
+    except (LexError, ParseError, EvalError) as exc:
+        print(f"error: {exc}", file=sys.stderr)
+        sys.exit(1)
+    print(result)
+
+
+if __name__ == "__main__":
+    main()