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

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

@@ -0,0 +1,54 @@
+import re
+
+_NUMBER_RE = re.compile(r'\d+\.?\d*|\.\d+')
+
+_SINGLE = {
+    '+': 'PLUS',
+    '-': 'MINUS',
+    '*': 'STAR',
+    '/': 'SLASH',
+    '(': 'LPAREN',
+    ')': 'RPAREN',
+}
+
+
+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
+
+
+def tokenize(src: str) -> list:
+    tokens = []
+    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