121 lines
4.1 KiB
Python
121 lines
4.1 KiB
Python
#!/usr/bin/env python3
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"""
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strip_fallback.py —— 安全剥离 var(--DEFINED_TOKEN, fallback) 的 fallback。
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仅当 token 在 _tokens.scss 中已定义时才剥离（此时 fallback 永不生效，剥离=零视觉变化）。
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未定义 token（fallback 是真实值）一律跳过。
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带 --write 才落盘，否则只 dry-run 报告。
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安全校验：每个被改的位置，改动后只是去掉了 ", fallback"，token 名和其余内容不变。
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"""
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import sys, re, glob, os
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def load_defined():
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txt = open('static/src/styles/base/_tokens.scss', encoding='utf-8').read()
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return set(re.findall(r'(--[a-z0-9-]+)\s*:', txt))
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def find_var_spans(s):
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"""返回所有 var(...) 的 (start, end, inner) ，支持嵌套，end 是右括号下一位。"""
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spans = []
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i = 0
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while True:
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m = re.search(r'var\(', s[i:])
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if not m:
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break
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start = i + m.start()
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# 从 'var(' 的左括号开始做括号匹配
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depth = 0
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j = start + 3 # points at '('
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assert s[j] == '('
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k = j
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while k < len(s):
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if s[k] == '(':
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depth += 1
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elif s[k] == ')':
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depth -= 1
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if depth == 0:
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break
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k += 1
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inner = s[j+1:k]
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spans.append((start, k+1, inner))
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i = k + 1
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return spans
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def strip_one(s, defined):
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"""对字符串 s 处理最外层 var()，递归处理 inner。返回 (新串, 改动数)。"""
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spans = find_var_spans(s)
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if not spans:
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return s, 0
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out = []
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last = 0
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changes = 0
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for start, end, inner in spans:
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out.append(s[last:start])
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# 先递归处理 inner（处理嵌套 var）
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new_inner, c_inner = strip_one(inner, defined)
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changes += c_inner
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# 解析最外层 var(--tok, fallback?) —— 在顶层逗号处分割
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mtok = re.match(r'\s*(--[a-z0-9-]+)\s*', new_inner)
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if mtok:
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tok = mtok.group(1)
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rest = new_inner[mtok.end():]
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if rest.startswith(','):
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# 有 fallback。token 已定义 → 剥离
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if tok in defined:
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out.append(f'var({tok})')
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changes += 1
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else:
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out.append(f'var({new_inner})')
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else:
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out.append(f'var({new_inner})')
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else:
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out.append(f'var({new_inner})')
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last = end
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out.append(s[last:])
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return ''.join(out), changes
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def process_file(path, defined, write):
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src = open(path, encoding='utf-8').read()
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new, ch = strip_one(src, defined)
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if ch and write:
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open(path, 'w', encoding='utf-8').write(new)
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return ch, src, new
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def verify(src, new):
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"""校验：去掉所有空白后，new 必须是 src 删除若干 ', fallback' 的结果。
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粗校验：new 的非空白字符是 src 非空白字符的子序列，且行数不变。"""
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if src.count('\n') != new.count('\n'):
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return False, "行数变化"
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# 每行：new 行必须是 old 行的子序列（只删不增）
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for o, n in zip(src.splitlines(), new.splitlines()):
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oi = 0
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for ch in n:
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oi = o.find(ch, oi)
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if oi == -1:
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return False, f"非子序列: {o!r} -> {n!r}"
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oi += 1
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return True, "ok"
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def main():
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write = '--write' in sys.argv
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args = [a for a in sys.argv[1:] if not a.startswith('--')]
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defined = load_defined()
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files = args or (glob.glob('static/src/**/*.scss', recursive=True) +
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glob.glob('static/src/**/*.vue', recursive=True))
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files = [f for f in files if '_tokens' not in f and '_virtual-monitor' not in f]
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total = 0
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for f in sorted(files):
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ch, src, new = process_file(f, defined, write=False)
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if not ch:
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continue
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ok, msg = verify(src, new)
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flag = "OK" if ok else f"FAIL({msg})"
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print(f"{ch:3d} strips [{flag}] {f}")
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if ok and write:
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open(f, 'w', encoding='utf-8').write(new)
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total += ch
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print(f"\n{'已写入' if write else 'DRY-RUN'} 总剥离: {total} 处")
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if __name__ == '__main__':
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main()
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