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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-only
import fnmatch
import io
import json
from pathlib import Path
import re
import shutil
import subprocess
import tarfile
import tempfile
from urllib.request import urlopen
import pygments
from pygments.lexers import _iter_lexerclasses
OUTPUT = Path(__file__).resolve().parent
TRANSLATIONS = {
"actionscript3": ["actionscript"],
"bdd": ["gherkin"],
"batch": ["dos"],
"capnp": ["capnproto"],
"clojurescript": ["clojure"],
"cuda": ["cpp"],
"console": ["shell"],
"desktop": ["freedesktop"],
"erl": ["erlang-repl"],
"fortranfixed": ["fortran"],
"gas": ["x86asm", "armasm", "avrasm"],
"html+django": ["django"],
"html+handlebars": ["handlebars"],
"html+php": ["php-template"],
"html+twig": ["twig"],
"html": ["xml"],
"json5": ["json"],
"jsp": ["java"],
"jsx": ["javascript"],
"k": ["q"],
"mips": ["mipsasm"],
"nasm": ["x86asm"],
"objective-c++": ["objectivec"],
"octave": ["matlab"],
"rhtml": ["erb"],
"roboconf-graph": ["roboconf"],
"roboconf-instances": ["roboconf"],
"slurm": ["bash"],
"systemd": ["freedesktop"],
"systemverilog": ["verilog"],
"tasm": ["x86asm"],
"text": ["plaintext"],
"toml": ["ini"],
"tsx": ["typescript"],
"wast": ["wasm"],
"xpp": ["axapta"],
"xslt": ["xml"],
"zone": ["dns"],
}
INTERPRETERS = {
"bash": r"^(?:ba|da|k|z)?sh$",
"python": r"^(?:python|pypy)[\d.]*$",
"javascript": r"^node(?:js)?$",
"perl": r"^perl$",
"ruby": r"^ruby$",
"lua": r"^lua[\d.]*$",
"php": r"^php$",
}
EXTRA_FILENAMES = {
"asciidoc": ["*.adoc", "*.asciidoc"],
"bash": ["*.sh.in"],
"cmake": ["*.cmake.in"],
"coffeescript": ["*.cson", "*.iced"],
"django": ["*.jinja"],
"erb": ["*.erb"],
"fortran": ["*.f95"],
"graphql": ["*.gql"],
"json": ["*.jsonc"],
"makefile": ["Kbuild", "BSDmakefile"],
"markdown": ["*.mkd", "*.mkdown"],
"typescript": ["*.cts", "*.mts"],
}
INSPECT = r"""
import fs from 'node:fs';
import { pathToFileURL } from 'node:url';
const base = process.argv[1];
const { default: hljs } = await import(pathToFileURL(base + '/core.min.js'));
for (const file of fs.readdirSync(base + '/languages').sort()) {
const { default: grammar } = await import(pathToFileURL(base + '/languages/' + file));
hljs.registerLanguage(file.replace('.min.js', ''), grammar);
}
const names = new Map(hljs.listLanguages().map(name => [hljs.getLanguage(name), name]));
const info = {};
for (const [language, name] of names) {
const seen = new Set(), dependencies = new Set();
function walk(value) {
if (!value || typeof value !== 'object' || seen.has(value)) return;
seen.add(value);
for (const alias of [value.subLanguage || []].flat()) {
const grammar = hljs.getLanguage(alias);
if (grammar && grammar !== language) {
dependencies.add(names.get(grammar));
walk(grammar);
}
}
Object.values(value).forEach(walk);
}
walk(language);
info[name] = [...dependencies].sort();
}
console.log(JSON.stringify(info));
"""
def pattern_regex(pattern):
regex = fnmatch.translate(pattern)
assert regex.startswith("(?s:") and regex.endswith((")\\Z", ")\\z"))
return regex[4:-3].replace("(?>", "(?:").replace("/", "\\/")
def generate():
for name in ("core.min.js", "filenames.js"):
(OUTPUT / name).unlink(missing_ok=True)
if (OUTPUT / "languages").exists():
shutil.rmtree(OUTPUT / "languages")
highlightjs = json.load(urlopen("https://registry.npmjs.org/@highlightjs/cdn-assets/latest"))
archive = urlopen(highlightjs["dist"]["tarball"]).read()
with tempfile.TemporaryDirectory() as temporary:
source = Path(temporary)
print(f"Using highlight.js {highlightjs['version']} and Pygments {pygments.__version__}")
with tarfile.open(fileobj=io.BytesIO(archive), mode="r:gz") as tar:
for member in tar.getmembers():
if re.fullmatch(r"package/es/(core\.min\.js|languages/[\w-]+\.min\.js)", member.name):
target = source / member.name.removeprefix("package/es/")
target.parent.mkdir(parents=True, exist_ok=True)
target.write_bytes(tar.extractfile(member).read())
(source / "package.json").write_text('{"type":"module"}\n')
info = json.loads(subprocess.check_output(
["node", "--input-type=module", "-e", INSPECT, str(source)], text=True))
groups = {}
matched = 0
def add(names, patterns, priority=0, primary=True):
for name in names:
if name not in info:
raise ValueError(f"No highlight.js grammar: {name}")
groups.setdefault((not primary, -priority, name), set()).update(patterns)
for lexer in _iter_lexerclasses(plugins=False):
names = next((TRANSLATIONS[a] for a in lexer.aliases if a in TRANSLATIONS), None)
if names is None:
name = next((a for a in lexer.aliases if a in info), None)
names = [name] if name else []
if names:
matched += 1
add(names, lexer.filenames, lexer.priority)
add(names, lexer.alias_filenames, lexer.priority, primary=False)
add(["cpp"], ["*.h"], 0.1)
for name, patterns in EXTRA_FILENAMES.items():
add([name], patterns)
dependencies = {name: deps for name, deps in info.items() if deps}
output = ["export const rules = ["]
for (_, _, name), patterns in sorted(groups.items()):
if patterns:
regex = "|".join(pattern_regex(p) for p in sorted(patterns))
output.append(f"[{json.dumps(name)},/^(?:{regex})(?!.)/s],")
output.extend(["];", "export const interpreters = ["])
output.extend(f"[{json.dumps(name)},/{regex}/]," for name, regex in INTERPRETERS.items())
output.extend(["];", "export const dependencies = " + json.dumps(dependencies, separators=(",", ":")) + ";", ""])
(OUTPUT / "languages").mkdir()
for asset in [source / "core.min.js", *sorted((source / "languages").glob("*.min.js"))]:
(OUTPUT / asset.relative_to(source)).write_bytes(asset.read_bytes())
(OUTPUT / "filenames.js").write_text("\n".join(output))
print(f"Mapped {matched} Pygments lexers; vendored {len(info)} grammars")
print(f"Filename rules and dependency data: {(OUTPUT / 'filenames.js').stat().st_size} bytes")
if __name__ == "__main__":
generate()
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