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

calculators/builder-adversary-stateless/run-03/calc/lexer.py

@@ -0,0 +1,58 @@
+"""Lexer for arithmetic expressions."""
+
+from __future__ import annotations
+import re
+
+
+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!r}, {self.value!r})"
+
+    def __eq__(self, other):
+        return isinstance(other, Token) and self.kind == other.kind and self.value == other.value
+
+
+_NUMBER_RE = re.compile(r"\d+\.?\d*|\.\d+")
+
+_SINGLE = {
+    "+": "PLUS",
+    "-": "MINUS",
+    "*": "STAR",
+    "/": "SLASH",
+    "(": "LPAREN",
+    ")": "RPAREN",
+}
+
+
+def tokenize(src: str) -> list[Token]:
+    tokens: list[Token] = []
+    i = 0
+    while i < len(src):
+        ch = src[i]
+        if ch in " \t":
+            i += 1
+            continue
+        if ch in _SINGLE:
+            tokens.append(Token(_SINGLE[ch], ch))
+            i += 1
+            continue
+        m = _NUMBER_RE.match(src, i)
+        if m:
+            raw = m.group()
+            value = float(raw) if "." in raw else int(raw)
+            tokens.append(Token("NUMBER", value))
+            i = m.end()
+            continue
+        raise LexError(f"unexpected character {ch!r} at position {i}")
+    tokens.append(Token("EOF", None))
+    return tokens