feat: VR字幕默认MarginV改为700并统一历史字幕样式
- srt-to-dual-eye-ass: 默认顶部安全边距 margin_top 120→700(2026-09), 120落在画面最顶需抬头看,700为实测合适值、视线自然可读 - nodes/ass.py: 样式定义抽为单一事实来源(DEFAULT_MARGIN_TOP/颜色常量 +ass_header/style_row/dialogue_line),新生成字幕与历史统一脚本共用同一 出口,以后调样式只改一处、两边永不漂移 - 新增scripts/unify_ass_style.py: 解析旧文件分辨率与全部Dialogue后经 ass_header/dialogue_line重建,把媒体库历史样式(底部an2实心白1200/ 半透明1020/顶部120)原地统一为an8顶部对齐+70%透明+MarginV=700; 默认dry-run预览,--apply写盘;非VR字幕自动跳过 - /mnt/fnOS/123 库401个.CN_dual_eye.ass已全部改写(0失败),269764条 字幕事件无an2残留,二次运行幂等 - 测试: ass默认值断言120→700,新增invoke默认700用例;新增 tests/test_unify_ass_style.py(历史三世代收敛/与write_ass逐字节一致/ 幂等/CLI dry-run与apply)
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"""历史 VR 双目字幕统一脚本（scripts/unify_ass_style.py）测试。
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背景
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----
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`scripts/unify_ass_style.py` 负责把媒体库中由旧版本生成、混有多种历史样式
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的 *.CN_dual_eye.ass 原地改写为 nodes/ass.py 当前统一样式
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（an8 顶部对齐 + 70% 透明 + DEFAULT_MARGIN_TOP=700）。
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本测试验证三条关键路径：
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1. 各历史样式（底部实心白 an2+MarginV1200 / 底部半透明 an2+MarginV1020 /
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顶部 120 / 已是 700）都能正确重建为统一的 700 样式；
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2. 重建结果与 nodes/ass.py 的 ass_header()/dialogue_line()（新生成字幕的
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唯一出口）**逐字节一致**，防止"新字幕"与"历史改写"两套逻辑漂移；
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3. 脚本文件能被直接加载执行（仓库根运行 uv run python scripts/...），
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且 rewrite_content 对非 VR 字幕返回 None（不误伤普通 ASS 文件）。
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测试使用真实 ASS 内容构造（Script Info + 样式 + 事件），不 mock 文件系统
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之外的任何逻辑。
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"""
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from __future__ import annotations
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import importlib.util
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import subprocess
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import sys
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from pathlib import Path
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import pytest
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# 仓库根（tests/ 的上一级），用于导入 scripts/unify_ass_style.py。
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WORKSPACE = Path(__file__).resolve().parent.parent
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SCRIPT_PATH = WORKSPACE / "scripts" / "unify_ass_style.py"
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# 用真实可执行的统一脚本构造各历史样式样本：以下文本代表旧版实际输出格式。
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HEADER_3840_OLD = """[Script Info]
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Title: VR Dual-Eye Subtitle
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ScriptType: v4.00+
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Collisions: Normal
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PlayResX: 3840
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PlayResY: 1920
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WrapStyle: 1
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ScaledBorderAndShadow: yes
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[V4+ Styles]
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Format: Name,Fontname,Fontsize,PrimaryColour,SecondaryColour,OutlineColour,BackColour,Bold,Italic,Underline,StrikeOut,ScaleX,ScaleY,Spacing,Angle,BorderStyle,Outline,Shadow,Alignment,MarginL,MarginR,MarginV,Encoding
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"""
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def _load_module():
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"""按文件路径加载 scripts/unify_ass_style.py（scripts 不是包，无法 import）。
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与仓库运行方式一致：uv run python scripts/unify_ass_style.py 时 pythonpath
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含仓库根，模块内 `from nodes.ass import ...` 可正常解析。"""
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spec = importlib.util.spec_from_file_location("unify_ass_style", SCRIPT_PATH)
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module = importlib.util.module_from_spec(spec)
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assert spec is not None and spec.loader is not None
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spec.loader.exec_module(module)
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return module
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U = _load_module()
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@pytest.fixture
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def sandbox(tmp_path):
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"""构造含三种历史样式 + 一个非 VR 文件的临时媒体库。
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每个测试独立临时目录（function scope），CLI 写盘测试不会污染其他测试。"""
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root = tmp_path
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# 1) 最早期：底部 an2 + 实心白 &H00FFFFFF + MarginV=1200。
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(root / "old_solid.CN_dual_eye.ass").write_text(
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HEADER_3840_OLD
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+ "Style: LeftEye,Arial,50,&H00FFFFFF,&H000000FF,&H00000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,2,50,1970,1200,1\n"
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+ "Style: RightEye,Arial,50,&H00FFFFFF,&H000000FF,&H00000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,2,1970,50,1200,1\n"
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+ "\n[Events]\n"
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+ "Format: Layer,Start,End,Style,Name,MarginL,MarginR,MarginV,Effect,Text\n"
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+ 'Dialogue: 0,00:00:00.000,00:00:03.000,LeftEye,,0,0,0,,{\\an2}第一行\\N第二行\n'
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+ 'Dialogue: 0,00:00:00.000,00:00:03.000,RightEye,,0,0,0,,{\\an2}第一行\\N第二行\n',
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encoding="utf-8",
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)
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# 2) 过渡期：底部 an2 + 半透明 &H80FFFFFF + MarginV=1020。
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(root / "mid_translucent.CN_dual_eye.ass").write_text(
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HEADER_3840_OLD
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+ "Style: LeftEye,Arial,50,&H80FFFFFF,&H000000FF,&H00000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,2,50,1970,1020,1\n"
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+ "Style: RightEye,Arial,50,&H80FFFFFF,&H000000FF,&H00000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,2,1970,50,1020,1\n"
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+ "\n[Events]\n"
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+ "Format: Layer,Start,End,Style,Name,MarginL,MarginR,MarginV,Effect,Text\n"
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+ 'Dialogue: 0,00:00:00.000,00:00:03.000,LeftEye,,0,0,0,,{\\an2}你好\n',
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encoding="utf-8",
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)
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# 3) 已是顶部 120 样式（旧代码默认），仍应规整为 700。
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(root / "top120.CN_dual_eye.ass").write_text(
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HEADER_3840_OLD
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+ "Style: LeftEye,Arial,50,&HB3FFFFFF,&H000000FF,&H80000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,8,50,1920,120,1\n"
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+ "Style: RightEye,Arial,50,&HB3FFFFFF,&H000000FF,&H80000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,8,1920,50,120,1\n"
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+ "\n[Events]\n"
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+ "Format: Layer,Start,End,Style,Name,MarginL,MarginR,MarginV,Effect,Text\n"
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+ 'Dialogue: 0,00:00:00.000,00:00:03.000,LeftEye,,0,0,0,,{\\an8}第三行\n',
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encoding="utf-8",
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)
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# 4) 非 VR 字幕（无 LeftEye/RightEye 样式），脚本不应改动。
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(root / "not_vr.CN_dual_eye.ass").write_text(
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"[Script Info]\nPlayResX: 1920\nPlayResY: 1080\n\n[V4+ Styles]\n"
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"Format: Name,Fontname,Fontsize,PrimaryColour,...\nStyle: Default,Arial,20,&H00FFFFFF,...\n",
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encoding="utf-8",
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)
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return root
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def _read(path: Path) -> str:
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"""以 UTF-8 读取测试文件内容。"""
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return path.read_text(encoding="utf-8")
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def test_rewrite_converges_all_generations(sandbox) -> None:
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"""三种历史样式统一后都含 an8 顶部对齐 + 70% 透明 + MarginV=700。"""
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# (文件名, 该文件期望保留的事件文本)
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expected_text = {
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"old_solid": r"第一行\N第二行", # 最早期多行字幕（an2 底部）
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"mid_translucent": "你好", # 过渡期
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"top120": "第三行", # 旧顶部 120
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}
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for name, text in expected_text.items():
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original = _read(sandbox / f"{name}.CN_dual_eye.ass")
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rewritten = U.rewrite_content(original)
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assert rewritten is not None, f"{name} 应被改写"
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# 左/右眼样式都落到统一值：70%透明 + an8 + MarginV=700。
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assert "&HB3FFFFFF,&H000000FF,&H80000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,8,50,1920,700,1" in rewritten
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assert "&HB3FFFFFF,&H000000FF,&H80000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,8,1920,50,700,1" in rewritten
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# 对齐标签全部为 an8，不再残留 an2。
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assert r"{\an8}" in rewritten
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assert r"{\an2}" not in rewritten
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# 事件文本原样保留。
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assert text in rewritten
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def test_rewrite_byte_identical_to_write_ass(sandbox) -> None:
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"""历史字幕统一后的输出与 write_ass() 生成的新字幕逐字节一致。
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防止"统一脚本"与"节点生成"两套样式逻辑漂移：两边都经由 ass_header()
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/dialogue_line()（nodes/ass.py 单一出口）。"""
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from nodes.ass import DEFAULT_MARGIN_TOP, ass_header, dialogue_line
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# 取 old_solid 样本的事件，用 write_ass 语义重建期望文本。
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original = _read(sandbox / "old_solid.CN_dual_eye.ass")
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rewritten = U.rewrite_content(original)
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assert rewritten is not None
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hdr = ass_header(3840, 1920, margin_top=DEFAULT_MARGIN_TOP).rstrip("\n")
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expected = "\n".join(
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[
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hdr,
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dialogue_line("LeftEye", "00:00:00.000", "00:00:03.000", "第一行\\N第二行"),
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dialogue_line("RightEye", "00:00:00.000", "00:00:03.000", "第一行\\N第二行"),
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]
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) + "\n"
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assert rewritten == expected
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def test_rewrite_skips_non_vr_and_already_canonical(sandbox) -> None:
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"""非 VR 字幕返回 None；已是目标样式（MarginV=700）也返回 None（幂等）。"""
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not_vr = _read(sandbox / "not_vr.CN_dual_eye.ass")
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assert U.rewrite_content(not_vr) is None
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# 构造一份已是 700 的新样式文本，改写应返回 None（内容不变）。
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from nodes.ass import ass_header, dialogue_line
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canonical = (
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ass_header(3840, 1920, margin_top=U.DEFAULT_MARGIN_TOP).rstrip("\n")
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+ "\n"
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+ dialogue_line("LeftEye", "00:00:00.000", "00:00:03.000", "嗨")
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+ "\n"
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)
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assert U.rewrite_content(canonical) is None
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def test_module_runs_as_cli_dry_run(sandbox) -> None:
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"""脚本可作为 CLI 以 dry-run 方式运行（uv run python scripts/...），不写盘。
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复现仓库根运行方式；断言 dry-run 输出含"旧样式分布"与"将改写"，
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且运行后沙盒内文件一个都没被改动（dry-run 语义）。"""
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before = {p.name: _read(p) for p in sandbox.glob("*.ass")}
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# 不带 --apply = dry-run：应只打印不写盘。
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proc = subprocess.run(
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[sys.executable, str(SCRIPT_PATH), str(sandbox)],
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capture_output=True,
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text=True,
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cwd=WORKSPACE, # 与 uv run python 一致：仓库根在 sys.path
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)
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assert proc.returncode == 0, proc.stderr
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out = proc.stdout
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assert "[将改写]" in out # 预览行标记
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assert "[改写]" not in out # 未真正写盘
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after = {p.name: _read(p) for p in sandbox.glob("*.ass")}
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assert before == after # dry-run 不改动任何文件
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def test_module_cli_apply_writes_files(sandbox) -> None:
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"""脚本加 --apply 后真正原地改写，写盘结果与 rewrite_content 一致。
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覆盖 main() 的写盘分支：统计输出显示 [改写]，且文件内容已变为
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MarginV=700 的统一新样式（第二次运行幂等，不再改写）。"""
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# 备份一个将改写的样本，确保 CLI 走的是与单元层相同的重建逻辑。
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old_solid = sandbox / "old_solid.CN_dual_eye.ass"
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expected = U.rewrite_content(old_solid.read_text(encoding="utf-8"))
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assert expected is not None
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proc = subprocess.run(
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[sys.executable, str(SCRIPT_PATH), str(sandbox), "--apply"],
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capture_output=True,
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text=True,
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cwd=WORKSPACE,
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)
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assert proc.returncode == 0, proc.stderr
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assert "[改写]" in proc.stdout
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assert old_solid.read_text(encoding="utf-8") == expected
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# 幂等：第二次 --apply 不再有任何 [改写]（文件已是目标样式）。
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proc2 = subprocess.run(
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[sys.executable, str(SCRIPT_PATH), str(sandbox), "--apply"],
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capture_output=True,
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text=True,
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cwd=WORKSPACE,
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)
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assert proc2.returncode == 0, proc2.stderr
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assert "[改写]" not in proc2.stdout
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def test_module_loads_and_exports() -> None:
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"""模块可加载且暴露 rewrite_content / DEFAULT_MARGIN_TOP。"""
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assert U.DEFAULT_MARGIN_TOP == 700
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assert callable(U.rewrite_content)
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