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const isWin = process.platform === 'win32';
const SEP = isWin ? `\\\\+` : `\\/`;
const SEP_ESC = isWin ? `\\\\` : `/`;
const GLOBSTAR = `((?:[^/]*(?:/|$))*)`;
const WILDCARD = `([^/]*)`;
const GLOBSTAR_SEGMENT = `((?:[^${SEP_ESC}]*(?:${SEP_ESC}|$))*)`;
const WILDCARD_SEGMENT = `([^${SEP_ESC}]*)`;
/**
* Convert any glob pattern to a JavaScript Regexp object
* @param {String} glob Glob pattern to convert
* @param {Object} opts Configuration object
* @param {Boolean} [opts.extended=false] Support advanced ext globbing
* @param {Boolean} [opts.globstar=false] Support globstar
* @param {Boolean} [opts.strict=true] be laissez faire about mutiple slashes
* @param {Boolean} [opts.filepath=''] Parse as filepath for extra path related features
* @param {String} [opts.flags=''] RegExp globs
* @returns {Object} converted object with string, segments and RegExp object
*/
function globrex(glob, {extended = false, globstar = false, strict = false, filepath = false, flags = ''} = {}) {
let regex = '';
let segment = '';
let path = { regex: '', segments: [] };
// If we are doing extended matching, this boolean is true when we are inside
// a group (eg {*.html,*.js}), and false otherwise.
let inGroup = false;
let inRange = false;
// extglob stack. Keep track of scope
const ext = [];
// Helper function to build string and segments
function add(str, {split, last, only}={}) {
if (only !== 'path') regex += str;
if (filepath && only !== 'regex') {
path.regex += (str === '\\/' ? SEP : str);
if (split) {
if (last) segment += str;
if (segment !== '') {
if (!flags.includes('g')) segment = `^${segment}$`; // change it 'includes'
path.segments.push(new RegExp(segment, flags));
}
segment = '';
} else {
segment += str;
}
}
}
let c, n;
for (let i = 0; i < glob.length; i++) {
c = glob[i];
n = glob[i + 1];
if (['\\', '$', '^', '.', '='].includes(c)) {
add(`\\${c}`);
continue;
}
if (c === '/') {
add(`\\${c}`, {split: true});
if (n === '/' && !strict) regex += '?';
continue;
}
if (c === '(') {
if (ext.length) {
add(c);
continue;
}
add(`\\${c}`);
continue;
}
if (c === ')') {
if (ext.length) {
add(c);
let type = ext.pop();
if (type === '@') {
add('{1}');
} else if (type === '!') {
add('([^\/]*)');
} else {
add(type);
}
continue;
}
add(`\\${c}`);
continue;
}
if (c === '|') {
if (ext.length) {
add(c);
continue;
}
add(`\\${c}`);
continue;
}
if (c === '+') {
if (n === '(' && extended) {
ext.push(c);
continue;
}
add(`\\${c}`);
continue;
}
if (c === '@' && extended) {
if (n === '(') {
ext.push(c);
continue;
}
}
if (c === '!') {
if (extended) {
if (inRange) {
add('^');
continue
}
if (n === '(') {
ext.push(c);
add('(?!');
i++;
continue;
}
add(`\\${c}`);
continue;
}
add(`\\${c}`);
continue;
}
if (c === '?') {
if (extended) {
if (n === '(') {
ext.push(c);
} else {
add('.');
}
continue;
}
add(`\\${c}`);
continue;
}
if (c === '[') {
if (inRange && n === ':') {
i++; // skip [
let value = '';
while(glob[++i] !== ':') value += glob[i];
if (value === 'alnum') add('(\\w|\\d)');
else if (value === 'space') add('\\s');
else if (value === 'digit') add('\\d');
i++; // skip last ]
continue;
}
if (extended) {
inRange = true;
add(c);
continue;
}
add(`\\${c}`);
continue;
}
if (c === ']') {
if (extended) {
inRange = false;
add(c);
continue;
}
add(`\\${c}`);
continue;
}
if (c === '{') {
if (extended) {
inGroup = true;
add('(');
continue;
}
add(`\\${c}`);
continue;
}
if (c === '}') {
if (extended) {
inGroup = false;
add(')');
continue;
}
add(`\\${c}`);
continue;
}
if (c === ',') {
if (inGroup) {
add('|');
continue;
}
add(`\\${c}`);
continue;
}
if (c === '*') {
if (n === '(' && extended) {
ext.push(c);
continue;
}
// Move over all consecutive "*"'s.
// Also store the previous and next characters
let prevChar = glob[i - 1];
let starCount = 1;
while (glob[i + 1] === '*') {
starCount++;
i++;
}
let nextChar = glob[i + 1];
if (!globstar) {
// globstar is disabled, so treat any number of "*" as one
add('.*');
} else {
// globstar is enabled, so determine if this is a globstar segment
let isGlobstar =
starCount > 1 && // multiple "*"'s
(prevChar === '/' || prevChar === undefined) && // from the start of the segment
(nextChar === '/' || nextChar === undefined); // to the end of the segment
if (isGlobstar) {
// it's a globstar, so match zero or more path segments
add(GLOBSTAR, {only:'regex'});
add(GLOBSTAR_SEGMENT, {only:'path', last:true, split:true});
i++; // move over the "/"
} else {
// it's not a globstar, so only match one path segment
add(WILDCARD, {only:'regex'});
add(WILDCARD_SEGMENT, {only:'path'});
}
}
continue;
}
add(c);
}
// When regexp 'g' flag is specified don't
// constrain the regular expression with ^ & $
if (!flags.includes('g')) {
regex = `^${regex}$`;
segment = `^${segment}$`;
if (filepath) path.regex = `^${path.regex}$`;
}
const result = {regex: new RegExp(regex, flags)};
// Push the last segment
if (filepath) {
path.segments.push(new RegExp(segment, flags));
path.regex = new RegExp(path.regex, flags);
path.globstar = new RegExp(!flags.includes('g') ? `^${GLOBSTAR_SEGMENT}$` : GLOBSTAR_SEGMENT, flags);
result.path = path;
}
return result;
}
module.exports = globrex;
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