120 lines
3.9 KiB
Python
120 lines
3.9 KiB
Python
"""将思源宋体压缩为常用字符子集（会丢失完整 CJK 字库，默认不再使用）。"""
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from __future__ import annotations
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import subprocess
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import sys
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from pathlib import Path
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ROOT = Path(__file__).resolve().parent
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FONTS_DIR = ROOT / "public" / "fonts"
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CHARS_FILE = ROOT / "scripts" / "subset-chars.txt"
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CHARS_SOURCE = ROOT / "scripts" / "3500-chars.txt"
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CHARS_URL = "https://raw.githubusercontent.com/elephantnose/characters/master/3500%E5%B8%B8%E7%94%A8%E6%B1%89%E5%AD%97.txt"
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WEIGHTS = (
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("SourceHanSerifSC-Regular.woff2", 400),
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("SourceHanSerifSC-Bold.woff2", 700),
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)
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EXTRA_SYMBOLS = "←→↑↓↔↕•·—–…「」『』【】《》〈〉“”‘’￥℃±×÷"
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def download_chars() -> str:
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import urllib.request
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CHARS_SOURCE.parent.mkdir(parents=True, exist_ok=True)
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print(f"下载常用 3500 字表 ...")
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urllib.request.urlretrieve(CHARS_URL, CHARS_SOURCE)
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han = CHARS_SOURCE.read_text(encoding="utf-8").replace("\n", "").replace("\r", "")
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return han
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def build_charset() -> str:
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han = download_chars() if not CHARS_SOURCE.exists() else CHARS_SOURCE.read_text(encoding="utf-8").replace("\n", "").replace("\r", "")
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parts = [
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"".join(chr(c) for c in range(0x20, 0x7F)),
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"".join(chr(c) for c in range(0xA0, 0x100)),
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"".join(chr(c) for c in range(0x2000, 0x206F + 1)),
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"".join(chr(c) for c in range(0x2190, 0x21FF + 1)),
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"".join(chr(c) for c in range(0x2200, 0x22FF + 1)),
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"".join(chr(c) for c in range(0x2460, 0x24FF + 1)),
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"".join(chr(c) for c in range(0x2500, 0x257F + 1)),
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"".join(chr(c) for c in range(0x3000, 0x303F + 1)),
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"".join(chr(c) for c in range(0xFF00, 0xFFEF + 1)),
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EXTRA_SYMBOLS,
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han,
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]
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chars = "".join(dict.fromkeys("".join(parts)))
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CHARS_FILE.parent.mkdir(parents=True, exist_ok=True)
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CHARS_FILE.write_text(chars, encoding="utf-8")
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print(f"字符集共 {len(chars)} 个字符 -> {CHARS_FILE.name}")
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return chars
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def subset_font(src: Path, dst: Path) -> None:
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cmd = [
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sys.executable,
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"-m",
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"fontTools.subset",
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str(src),
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f"--text-file={CHARS_FILE}",
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"--flavor=woff2",
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f"--output-file={dst}",
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]
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subprocess.run(cmd, check=True)
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def main() -> None:
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print("当前项目使用完整 CJK 可变字体，请运行 convert_fonts.py 而非本脚本。")
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print("若仍要子集化，请删除 public/fonts/SourceHanSerifSC-VF.woff2 后重试。")
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if (FONTS_DIR / "SourceHanSerifSC-VF.woff2").exists():
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sys.exit(1)
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FONTS_DIR.mkdir(parents=True, exist_ok=True)
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build_charset()
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for filename, _ in WEIGHTS:
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src = FONTS_DIR / filename
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if not src.exists():
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print(f"缺少源字体: {src}")
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print("请先将完整 woff2 字体放入 public/fonts/ 后再运行本脚本。")
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sys.exit(1)
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tmp_dir = FONTS_DIR / "_subset_tmp"
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tmp_dir.mkdir(exist_ok=True)
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total_kb = 0
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for filename, _ in WEIGHTS:
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src = FONTS_DIR / filename
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tmp = tmp_dir / filename
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print(f"子集化 {filename} ...", end=" ")
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subset_font(src, tmp)
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kb = tmp.stat().st_size // 1024
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total_kb += kb
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print(f"ok ({kb} KB)")
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# 删除多余字重与临时测试文件
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keep = {name for name, _ in WEIGHTS}
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for path in FONTS_DIR.glob("*.woff2"):
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if path.name not in keep and not path.name.startswith("_"):
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print(f"删除 {path.name}")
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path.unlink()
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for path in FONTS_DIR.glob("_*.woff2"):
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path.unlink(missing_ok=True)
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for filename, _ in WEIGHTS:
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tmp = tmp_dir / filename
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dst = FONTS_DIR / filename
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if dst.exists():
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dst.unlink()
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tmp.replace(dst)
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tmp_dir.rmdir()
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print(f"完成，保留 {len(WEIGHTS)} 个字重，合计约 {total_kb / 1024:.2f} MB")
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if __name__ == "__main__":
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main()
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