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388658efdb
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Zanie Blue <contact@zanie.dev> Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
104 lines
3.6 KiB
Python
104 lines
3.6 KiB
Python
"""Generate the confusables.rs file from the VS Code ambiguous.json file."""
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from __future__ import annotations
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import json
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import subprocess
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from pathlib import Path
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CONFUSABLES_RS_PATH = "crates/ruff_linter/src/rules/ruff/rules/confusables.rs"
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AMBIGUOUS_JSON_URL = "https://raw.githubusercontent.com/hediet/vscode-unicode-data/main/out/ambiguous.json"
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prelude = """
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//! This file is auto-generated by `scripts/update_ambiguous_characters.py`.
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/// Via: <https://github.com/hediet/vscode-unicode-data/blob/main/out/ambiguous.json>
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/// See: <https://github.com/microsoft/vscode/blob/095ddabc52b82498ee7f718a34f9dd11d59099a8/src/vs/base/common/strings.ts#L1094>
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pub(crate) fn confusable(c: u32) -> Option<char> {
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let result = match c {
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""".lstrip()
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postlude = """_ => return None, }; Some(result)}"""
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def get_mapping_data() -> dict:
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"""
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Get the ambiguous character mapping data from the vscode-unicode-data repository.
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Uses the system's `curl` command to download the data,
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instead of adding a dependency to a Python-native HTTP client.
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"""
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content = subprocess.check_output(
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["curl", "-sSL", AMBIGUOUS_JSON_URL],
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encoding="utf-8",
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)
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# The content is a JSON object literal wrapped in a JSON string, so double decode:
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return json.loads(json.loads(content))
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def format_number(number: int) -> str:
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"""Underscore-separate the digits of a number."""
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# For unknown historical reasons, numbers greater than 100,000 were
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# underscore-delimited in the generated file, so we now preserve that property to
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# avoid unnecessary churn.
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if number > 100000:
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number = str(number)
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number = "_".join(number[i : i + 3] for i in range(0, len(number), 3))
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return f"{number}_u32"
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return f"{number}u32"
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def format_char(number: int) -> str:
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"""Format a Python integer as a Rust character literal."""
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char = chr(number)
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if char == "\\":
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return "\\\\"
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return char
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def format_confusables_rs(raw_data: dict[str, list[int]]) -> str:
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"""Format the downloaded data into a Rust source file."""
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# The input data contains duplicate entries.
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flattened_items: set[tuple[int, int]] = set()
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for _category, items in raw_data.items():
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assert len(items) % 2 == 0, "Expected pairs of items"
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for i in range(0, len(items), 2):
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flattened_items.add((items[i], items[i + 1]))
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tuples = [
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f" {format_number(left)} => '{format_char(right)}',\n"
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for left, right in sorted(flattened_items)
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]
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# Add some additional confusable pairs that are not included in the VS Code data,
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# as they're unicode-to-unicode confusables, not unicode-to-ASCII confusables.
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confusable_units = [
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# ANGSTROM SIGN → LATIN CAPITAL LETTER A WITH RING ABOVE
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("0x212B", chr(0x00C5)),
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# OHM SIGN → GREEK CAPITAL LETTER OMEGA
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("0x2126", chr(0x03A9)),
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# MICRO SIGN → GREEK SMALL LETTER MU
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("0x00B5", chr(0x03BC)),
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]
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tuples += [f" {left} => '{right}',\n" for left, right in confusable_units]
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print(f"{len(tuples)} confusable tuples.")
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return prelude + "".join(tuples) + postlude
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def main() -> None:
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print("Retrieving data...")
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mapping_data = get_mapping_data()
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formatted_data = format_confusables_rs(mapping_data)
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confusables_path = Path(__file__).parent.parent / CONFUSABLES_RS_PATH
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confusables_path.write_text(formatted_data, encoding="utf-8")
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print("Formatting Rust file with cargo fmt...")
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subprocess.check_call(["cargo", "fmt", "--", confusables_path])
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print("Done.")
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if __name__ == "__main__":
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main()
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