AlkantarClanX12
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// synchronous utility for filtering entries and calculating subwalks
import { GLOBSTAR } from 'minimatch';
/**
* A cache of which patterns have been processed for a given Path
*/
export class HasWalkedCache {
store;
constructor(store = new Map()) {
this.store = store;
}
copy() {
return new HasWalkedCache(new Map(this.store));
}
hasWalked(target, pattern) {
return this.store.get(target.fullpath())?.has(pattern.globString());
}
storeWalked(target, pattern) {
const fullpath = target.fullpath();
const cached = this.store.get(fullpath);
if (cached)
cached.add(pattern.globString());
else
this.store.set(fullpath, new Set([pattern.globString()]));
}
}
/**
* A record of which paths have been matched in a given walk step,
* and whether they only are considered a match if they are a directory,
* and whether their absolute or relative path should be returned.
*/
export class MatchRecord {
store = new Map();
add(target, absolute, ifDir) {
const n = (absolute ? 2 : 0) | (ifDir ? 1 : 0);
const current = this.store.get(target);
this.store.set(target, current === undefined ? n : n & current);
}
// match, absolute, ifdir
entries() {
return [...this.store.entries()].map(([path, n]) => [
path,
!!(n & 2),
!!(n & 1),
]);
}
}
/**
* A collection of patterns that must be processed in a subsequent step
* for a given path.
*/
export class SubWalks {
store = new Map();
add(target, pattern) {
if (!target.canReaddir()) {
return;
}
const subs = this.store.get(target);
if (subs) {
if (!subs.find(p => p.globString() === pattern.globString())) {
subs.push(pattern);
}
}
else
this.store.set(target, [pattern]);
}
get(target) {
const subs = this.store.get(target);
/* c8 ignore start */
if (!subs) {
throw new Error('attempting to walk unknown path');
}
/* c8 ignore stop */
return subs;
}
entries() {
return this.keys().map(k => [k, this.store.get(k)]);
}
keys() {
return [...this.store.keys()].filter(t => t.canReaddir());
}
}
/**
* The class that processes patterns for a given path.
*
* Handles child entry filtering, and determining whether a path's
* directory contents must be read.
*/
export class Processor {
hasWalkedCache;
matches = new MatchRecord();
subwalks = new SubWalks();
patterns;
follow;
dot;
opts;
constructor(opts, hasWalkedCache) {
this.opts = opts;
this.follow = !!opts.follow;
this.dot = !!opts.dot;
this.hasWalkedCache =
hasWalkedCache ? hasWalkedCache.copy() : new HasWalkedCache();
}
processPatterns(target, patterns) {
this.patterns = patterns;
const processingSet = patterns.map(p => [target, p]);
// map of paths to the magic-starting subwalks they need to walk
// first item in patterns is the filter
for (let [t, pattern] of processingSet) {
this.hasWalkedCache.storeWalked(t, pattern);
const root = pattern.root();
const absolute = pattern.isAbsolute() && this.opts.absolute !== false;
// start absolute patterns at root
if (root) {
t = t.resolve(root === '/' && this.opts.root !== undefined ?
this.opts.root
: root);
const rest = pattern.rest();
if (!rest) {
this.matches.add(t, true, false);
continue;
}
else {
pattern = rest;
}
}
if (t.isENOENT())
continue;
let p;
let rest;
let changed = false;
while (typeof (p = pattern.pattern()) === 'string' &&
(rest = pattern.rest())) {
const c = t.resolve(p);
t = c;
pattern = rest;
changed = true;
}
p = pattern.pattern();
rest = pattern.rest();
if (changed) {
if (this.hasWalkedCache.hasWalked(t, pattern))
continue;
this.hasWalkedCache.storeWalked(t, pattern);
}
// now we have either a final string for a known entry,
// more strings for an unknown entry,
// or a pattern starting with magic, mounted on t.
if (typeof p === 'string') {
// must not be final entry, otherwise we would have
// concatenated it earlier.
const ifDir = p === '..' || p === '' || p === '.';
this.matches.add(t.resolve(p), absolute, ifDir);
continue;
}
else if (p === GLOBSTAR) {
// if no rest, match and subwalk pattern
// if rest, process rest and subwalk pattern
// if it's a symlink, but we didn't get here by way of a
// globstar match (meaning it's the first time THIS globstar
// has traversed a symlink), then we follow it. Otherwise, stop.
if (!t.isSymbolicLink() ||
this.follow ||
pattern.checkFollowGlobstar()) {
this.subwalks.add(t, pattern);
}
const rp = rest?.pattern();
const rrest = rest?.rest();
if (!rest || ((rp === '' || rp === '.') && !rrest)) {
// only HAS to be a dir if it ends in **/ or **/.
// but ending in ** will match files as well.
this.matches.add(t, absolute, rp === '' || rp === '.');
}
else {
if (rp === '..') {
// this would mean you're matching **/.. at the fs root,
// and no thanks, I'm not gonna test that specific case.
/* c8 ignore start */
const tp = t.parent || t;
/* c8 ignore stop */
if (!rrest)
this.matches.add(tp, absolute, true);
else if (!this.hasWalkedCache.hasWalked(tp, rrest)) {
this.subwalks.add(tp, rrest);
}
}
}
}
else if (p instanceof RegExp) {
this.subwalks.add(t, pattern);
}
}
return this;
}
subwalkTargets() {
return this.subwalks.keys();
}
child() {
return new Processor(this.opts, this.hasWalkedCache);
}
// return a new Processor containing the subwalks for each
// child entry, and a set of matches, and
// a hasWalkedCache that's a copy of this one
// then we're going to call
filterEntries(parent, entries) {
const patterns = this.subwalks.get(parent);
// put matches and entry walks into the results processor
const results = this.child();
for (const e of entries) {
for (const pattern of patterns) {
const absolute = pattern.isAbsolute();
const p = pattern.pattern();
const rest = pattern.rest();
if (p === GLOBSTAR) {
results.testGlobstar(e, pattern, rest, absolute);
}
else if (p instanceof RegExp) {
results.testRegExp(e, p, rest, absolute);
}
else {
results.testString(e, p, rest, absolute);
}
}
}
return results;
}
testGlobstar(e, pattern, rest, absolute) {
if (this.dot || !e.name.startsWith('.')) {
if (!pattern.hasMore()) {
this.matches.add(e, absolute, false);
}
if (e.canReaddir()) {
// if we're in follow mode or it's not a symlink, just keep
// testing the same pattern. If there's more after the globstar,
// then this symlink consumes the globstar. If not, then we can
// follow at most ONE symlink along the way, so we mark it, which
// also checks to ensure that it wasn't already marked.
if (this.follow || !e.isSymbolicLink()) {
this.subwalks.add(e, pattern);
}
else if (e.isSymbolicLink()) {
if (rest && pattern.checkFollowGlobstar()) {
this.subwalks.add(e, rest);
}
else if (pattern.markFollowGlobstar()) {
this.subwalks.add(e, pattern);
}
}
}
}
// if the NEXT thing matches this entry, then also add
// the rest.
if (rest) {
const rp = rest.pattern();
if (typeof rp === 'string' &&
// dots and empty were handled already
rp !== '..' &&
rp !== '' &&
rp !== '.') {
this.testString(e, rp, rest.rest(), absolute);
}
else if (rp === '..') {
/* c8 ignore start */
const ep = e.parent || e;
/* c8 ignore stop */
this.subwalks.add(ep, rest);
}
else if (rp instanceof RegExp) {
this.testRegExp(e, rp, rest.rest(), absolute);
}
}
}
testRegExp(e, p, rest, absolute) {
if (!p.test(e.name))
return;
if (!rest) {
this.matches.add(e, absolute, false);
}
else {
this.subwalks.add(e, rest);
}
}
testString(e, p, rest, absolute) {
// should never happen?
if (!e.isNamed(p))
return;
if (!rest) {
this.matches.add(e, absolute, false);
}
else {
this.subwalks.add(e, rest);
}
}
}
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