#!/usr/bin/env python3 """Pin Phase 24 float fit-content geometry to Chromium. Run with: uv run --project moli-benchmark \ python scripts/layout-phase24-float-fit-content-chromium-differential.py The paired Rust regression is `floated_auto_width_inline_formatting_contexts_shrink_to_fit`. """ from __future__ import annotations import argparse import html import json import os import re import subprocess from pathlib import Path from typing import Any ROOT = Path(__file__).resolve().parents[1] FIXTURE = ROOT / "scripts" / "fixtures" / "layout-phase24-float-fit-content.html" DEFAULT_CHROMIUM = Path( os.environ.get( "CHROMIUM_BINARY", str(Path.home() / "chromium" / "src" / "out" / "Default" / "chrome"), ) ).expanduser() EXPECTED_GEOMETRY: dict[str, list[float]] = { "baidu-case": [20, 20, 1076, 70], "baidu-logo": [20, 37, 101, 33], "baidu-logo-image": [20, 37, 101, 33], "baidu-main": [139, 35, 748, 45], "max-case": [20, 120, 300, 70], "max": [20, 120, 248, 20], "limit-case": [380, 120, 200, 70], "limit": [380, 120, 200, 40], "min-case": [640, 120, 120, 70], "min": [640, 120, 160, 40], "right-case": [20, 220, 300, 70], "right": [72, 220, 248, 20], "margin-case": [380, 220, 200, 70], "margin-float": [390, 220, 175, 40], "max-clamp-case": [640, 220, 300, 70], "max-clamp": [640, 220, 200, 40], "min-clamp-case": [20, 320, 300, 70], "min-clamp": [20, 320, 260, 20], "specified-case": [380, 320, 300, 70], "specified": [380, 320, 120, 40], "edge-case": [740, 320, 300, 70], "edge": [750, 320, 272, 24], "block-control-case": [20, 420, 300, 70], "block-control": [20, 420, 180, 20], "replaced-control-case": [380, 420, 300, 70], "replaced-control": [380, 420, 101, 33], "stretch-control-case": [740, 420, 300, 70], "stretch-control": [740, 420, 300, 20], "inline-margin-case": [20, 520, 200, 70], "inline-margin-float": [30, 520, 175, 40], "negative-margin-case": [380, 520, 200, 70], "negative-margin-float": [370, 520, 225, 40], "inline-negative-margin-case": [740, 520, 200, 70], "inline-negative-margin-float": [730, 520, 225, 40], } EXPECTED_COMPUTED: dict[str, dict[str, str]] = { "baidu-logo": {"display": "block", "float": "left", "width": "101px", "boxSizing": "content-box"}, "max": {"display": "block", "float": "left", "width": "248px", "boxSizing": "content-box"}, "limit": {"display": "block", "float": "left", "width": "200px", "boxSizing": "content-box"}, "min": {"display": "block", "float": "left", "width": "160px", "boxSizing": "content-box"}, "right": {"display": "block", "float": "right", "width": "248px", "boxSizing": "content-box"}, "margin-float": {"display": "block", "float": "left", "width": "175px", "boxSizing": "content-box"}, "max-clamp": {"display": "block", "float": "left", "width": "200px", "boxSizing": "content-box"}, "min-clamp": {"display": "block", "float": "left", "width": "260px", "boxSizing": "content-box"}, "specified": {"display": "block", "float": "left", "width": "120px", "boxSizing": "content-box"}, "edge": {"display": "block", "float": "left", "width": "248px", "boxSizing": "content-box"}, "block-control": {"display": "block", "float": "left", "width": "180px", "boxSizing": "content-box"}, "replaced-control": {"display": "block", "float": "left", "width": "101px", "boxSizing": "content-box"}, "stretch-control": {"display": "block", "float": "none", "width": "300px", "boxSizing": "content-box"}, "inline-margin-float": {"display": "block", "float": "left", "width": "175px", "boxSizing": "content-box"}, "negative-margin-float": {"display": "block", "float": "left", "width": "225px", "boxSizing": "content-box"}, "inline-negative-margin-float": {"display": "block", "float": "left", "width": "225px", "boxSizing": "content-box"}, } def run_chromium(binary: Path, *arguments: str) -> subprocess.CompletedProcess[str]: return subprocess.run( [ str(binary), "--headless=new", "--disable-background-networking", "--disable-default-apps", "--disable-gpu", "--hide-scrollbars", "--no-first-run", "--no-sandbox", "--window-size=1200,620", *arguments, ], check=True, capture_output=True, text=True, ) def assert_close(label: str, actual: Any, expected: Any) -> None: if isinstance(expected, (int, float)) and not isinstance(expected, bool): if not isinstance(actual, (int, float)) or abs(actual - expected) > 0.05: raise AssertionError(f"{label}: expected {expected}, got {actual}") return if isinstance(expected, list): if not isinstance(actual, list) or len(actual) != len(expected): raise AssertionError(f"{label}: expected {expected}, got {actual}") for index, (actual_item, expected_item) in enumerate(zip(actual, expected)): assert_close(f"{label}[{index}]", actual_item, expected_item) return if isinstance(expected, dict): if not isinstance(actual, dict) or actual.keys() != expected.keys(): raise AssertionError(f"{label}: expected keys {expected.keys()}, got {actual}") for key, expected_item in expected.items(): assert_close(f"{label}.{key}", actual[key], expected_item) return if actual != expected: raise AssertionError(f"{label}: expected {expected!r}, got {actual!r}") def measure(binary: Path) -> dict[str, Any]: dumped = run_chromium(binary, "--dump-dom", FIXTURE.resolve().as_uri()).stdout match = re.search(r'
(.*?)
', dumped, re.DOTALL) if match is None: raise RuntimeError("Chromium dump did not contain the fixture output") return json.loads(html.unescape(match.group(1))) def main() -> None: parser = argparse.ArgumentParser() parser.add_argument("--chromium", type=Path, default=DEFAULT_CHROMIUM) parser.add_argument("--record", action="store_true") args = parser.parse_args() measured = measure(args.chromium) if not args.record: assert_close("geometry", measured["geometry"], EXPECTED_GEOMETRY) assert_close("computed", measured["computed"], EXPECTED_COMPUTED) print( json.dumps( { "status": "recorded" if args.record else "passed", "chromium": str(args.chromium), **measured, }, ensure_ascii=False, indent=2, ) ) if __name__ == "__main__": main()