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

calculators/builder-adversary-stateless/run-05/calc/lexer.py

@@ -0,0 +1,60 @@
+"""Lexer for arithmetic calculator."""
+
+
+class LexError(Exception):
+    pass
+
+
+class Token:
+    __slots__ = ("kind", "value")
+
+    def __init__(self, kind: str, value):
+        self.kind = kind
+        self.value = value
+
+    def __repr__(self):
+        return f"Token({self.kind}, {self.value!r})"
+
+    def __eq__(self, other):
+        return isinstance(other, Token) and self.kind == other.kind and self.value == other.value
+
+
+_SINGLE = {
+    "+": "PLUS",
+    "-": "MINUS",
+    "*": "STAR",
+    "/": "SLASH",
+    "(": "LPAREN",
+    ")": "RPAREN",
+}
+
+
+def tokenize(src: str) -> list:
+    tokens = []
+    i = 0
+    n = len(src)
+    while i < n:
+        ch = src[i]
+        if ch in " \t":
+            i += 1
+        elif ch in _SINGLE:
+            tokens.append(Token(_SINGLE[ch], ch))
+            i += 1
+        elif ch.isdigit() or ch == ".":
+            j = i
+            has_dot = False
+            while j < n and (src[j].isdigit() or (src[j] == "." and not has_dot)):
+                if src[j] == ".":
+                    has_dot = True
+                j += 1
+            raw = src[i:j]
+            try:
+                value = float(raw) if has_dot else int(raw)
+            except ValueError:
+                raise LexError(f"invalid number literal {raw!r} at position {i}")
+            tokens.append(Token("NUMBER", value))
+            i = j
+        else:
+            raise LexError(f"unexpected character {ch!r} at position {i}")
+    tokens.append(Token("EOF", None))
+    return tokens