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| nginx-parser.js
// nginx config lexer + parser (browser version)
// 用法：
// import { parseNginx } from './nginx-parser.js';
// const payload = parseNginx(nginxText, { filename:'nginx.conf', comments:true });
const EXTERNAL_PARSERS = {}; // 预留第三方指令解析器
// ---------- lexer ----------
function* lex(text, filename = 'nginx.conf') {
let line = 1, col = 0, idx = 0;
const len = text.length;
function skipWhitespace() {
while (idx < len && /\s/.test(text[idx])) {
if (text[idx] === '\n') { line++; col = 0; }
else col++;
idx++;
}
}
function readString(quote) {
const start = ++idx; // skip open quote
col++;
while (idx < len && text[idx] !== quote) {
if (text[idx] === '\n') { line++; col = 0; }
else if (text[idx] === '\\') { idx++; col++; } // skip escaped
idx++; col++;
}
if (idx >= len) throw new Error(`Unterminated quoted string at ${filename}:${line}`);
const val = text.slice(start, idx);
idx++; col++; // skip close quote
return [val, line, true]; // [token, lineno, quoted]
}
function readToken() {
const start = idx;
while (idx < len && !/\s|[{};#"'\\]/.test(text[idx])) {
idx++; col++;
}
return text.slice(start, idx);
}
while (idx < len) {
skipWhitespace();
if (idx >= len) break;
const ch = text[idx];
if (ch === '#' || ch === ';' || ch === '{' || ch === '}') {
const tok = ch === '#' ? text.slice(idx, text.indexOf('\n', idx)) || text.slice(idx)
: ch;
yield [tok, line, false];
if (tok === '\n') { line++; col = 0; }
else col++;
idx += tok.length;
} else if (ch === '"' || ch === "'") {
yield readString(ch);
} else {
const tok = readToken();
if (tok) yield [tok, line, false];
}
}
}
// ---------- util ----------
class NgxParserDirectiveError extends Error {
constructor(msg, lineno) {
super(msg);
this.name = 'NgxParserDirectiveError';
this.lineno = lineno;
}
}
// 简易版 analyze，只检查末尾符号
function analyze({ fname, stmt, term, ctx, strict, check_ctx, check_args }) {
const dir = stmt.directive;
if (dir === '#') return; // 注释跳过
if (dir.startsWith('#')) return; // 行内注释也跳过
// 更复杂的上下文/参数检查可在此扩展
if (term !== ';' && term !== '{' && term !== '}') {
throw new NgxParserDirectiveError(
`directive "${dir}" is not terminated by ";" or "{"`, stmt.line);
}
}
function enterBlockCtx(stmt, ctx) {
// 返回新的上下文，简单拼路径
return [...ctx, stmt.directive];
}
// ---------- parser ----------
export function parseNginx(text, {
filename = 'nginx.conf',
onerror = null,
catchErrors = true,
ignore = [],
single = false,
comments = false,
strict = false,
checkCtx = true,
checkArgs = true
} = {}) {
const tokens = [...lex(text, filename)]; // 先全部展开，方便 next()
let tokIdx = 0;
function next() {
if (tokIdx >= tokens.length) return [null, -1, false];
return tokens[tokIdx++];
}
function peek() {
if (tokIdx >= tokens.length) return [null, -1, false];
return tokens[tokIdx];
}
const payload = {
status: 'ok',
errors: [],
config: []
};
function handleError(parsing, e) {
const file = parsing.file;
const errObj = { file, error: e.message, line: e.lineno || null };
if (onerror) errObj.callback = onerror(e);
parsing.status = 'failed';
parsing.errors.push({ error: e.message, line: e.lineno || null });
payload.status = 'failed';
payload.errors.push(errObj);
}
function _parse(parsing, ctx = [], consume = false) {
const fname = parsing.file;
const parsed = [];
while (true) {
const [token, lineno, quoted] = next();
if (!token) break;
if (token === '}' && !quoted) break;
if (consume) {
if (token === '{' && !quoted) _parse(parsing, ctx, true);
continue;
}
const directive = token;
// 注释行
if (directive.startsWith('#') && !quoted) {
if (comments) {
parsed.push({ directive: '#', line: lineno, args: [], comment: directive.slice(1).trim() });
}
continue;
}
const stmt = { directive, line: lineno, args: [] };
if (!single) stmt.file = fname;
// 收集参数
const commentsInArgs = [];
let term;
while (true) {
const [t, , q] = peek();
if (!t || (!q && [';', '{', '}'].includes(t))) { term = t; next(); break; }
next();
if (t.startsWith('#') && !q) commentsInArgs.push(t.slice(1).trim());
else stmt.args.push(t);
}
if (ignore.includes(stmt.directive)) {
if (term === '{' && !quoted) _parse(parsing, ctx, true);
continue;
}
// if 特殊处理
if (stmt.directive === 'if') {
const args = stmt.args;
if (args.length && args[0].startsWith('(') && args[args.length - 1].endsWith(')')) {
args[0] = args[0].slice(1).trimLeft();
args[args.length - 1] = args[args.length - 1].slice(0, -1).trimRight();
}
}
try {
analyze({ fname, stmt, term, ctx, strict, check_ctx: checkCtx, check_args: checkArgs });
} catch (e) {
if (catchErrors) {
handleError(parsing, e);
if (e.message.includes('is not terminated') && term !== '}' && !quoted) {
_parse(parsing, ctx, true);
}
continue;
} else {
throw e;
}
}
// include 处理（浏览器端不做文件 IO，只留空壳）
if (!single && stmt.directive === 'include') {
stmt.includes = []; // 实际文件列表无法获取，留空
}
if (term === '{' && !quoted) {
const inner = enterBlockCtx(stmt, ctx);
stmt.block = _parse(parsing, inner);
}
parsed.push(stmt);
// 行内注释追加
commentsInArgs.forEach(c => parsed.push({ directive: '#', line: stmt.line, args: [], comment: c }));
}
return parsed;
}
// 主流程
const parsing = { file: filename, status: 'ok', errors: [], parsed: [] };
try {
parsing.parsed = _parse(parsing, []);
} catch (e) {
handleError(parsing, e);
}
payload.config.push(parsing);
return payload;
}
// 预留外部解析器注册
export function registerExternalParser(parser, directives) {
directives.forEach(d => { EXTERNAL_PARSERS[d] = parser; });
}
|