index.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.EXPANSION_MAX = void 0;
exports.expand = expand;
const balanced_match_1 = require("balanced-match");
const escSlash = '\0SLASH' + Math.random() + '\0';
const escOpen = '\0OPEN' + Math.random() + '\0';
const escClose = '\0CLOSE' + Math.random() + '\0';
const escComma = '\0COMMA' + Math.random() + '\0';
const escPeriod = '\0PERIOD' + Math.random() + '\0';
const escSlashPattern = new RegExp(escSlash, 'g');
const escOpenPattern = new RegExp(escOpen, 'g');
const escClosePattern = new RegExp(escClose, 'g');
const escCommaPattern = new RegExp(escComma, 'g');
const escPeriodPattern = new RegExp(escPeriod, 'g');
const slashPattern = /\\\\/g;
const openPattern = /\\{/g;
const closePattern = /\\}/g;
const commaPattern = /\\,/g;
const periodPattern = /\\./g;
exports.EXPANSION_MAX = 100_000;
function numeric(str) {
return !isNaN(str) ? parseInt(str, 10) : str.charCodeAt(0);
}
function escapeBraces(str) {
return str
.replace(slashPattern, escSlash)
.replace(openPattern, escOpen)
.replace(closePattern, escClose)
.replace(commaPattern, escComma)
.replace(periodPattern, escPeriod);
}
function unescapeBraces(str) {
return str
.replace(escSlashPattern, '\\')
.replace(escOpenPattern, '{')
.replace(escClosePattern, '}')
.replace(escCommaPattern, ',')
.replace(escPeriodPattern, '.');
}
/**
* Basically just str.split(","), but handling cases
* where we have nested braced sections, which should be
* treated as individual members, like {a,{b,c},d}
*/
function parseCommaParts(str) {
if (!str) {
return [''];
}
const parts = [];
const m = (0, balanced_match_1.balanced)('{', '}', str);
if (!m) {
return str.split(',');
}
const { pre, body, post } = m;
const p = pre.split(',');
p[p.length - 1] += '{' + body + '}';
const postParts = parseCommaParts(post);
if (post.length) {
;
p[p.length - 1] += postParts.shift();
p.push.apply(p, postParts);
}
parts.push.apply(parts, p);
return parts;
}
function expand(str, options = {}) {
if (!str) {
return [];
}
const { max = exports.EXPANSION_MAX } = options;
// I don't know why Bash 4.3 does this, but it does.
// Anything starting with {} will have the first two bytes preserved
// but *only* at the top level, so {},a}b will not expand to anything,
// but a{},b}c will be expanded to [a}c,abc].
// One could argue that this is a bug in Bash, but since the goal of
// this module is to match Bash's rules, we escape a leading {}
if (str.slice(0, 2) === '{}') {
str = '\\{\\}' + str.slice(2);
}
return expand_(escapeBraces(str), max, true).map(unescapeBraces);
}
function embrace(str) {
return '{' + str + '}';
}
function isPadded(el) {
return /^-?0\d/.test(el);
}
function lte(i, y) {
return i <= y;
}
function gte(i, y) {
return i >= y;
}
function expand_(str, max, isTop) {
/** @type {string[]} */
const expansions = [];
const m = (0, balanced_match_1.balanced)('{', '}', str);
if (!m)
return [str];
// no need to expand pre, since it is guaranteed to be free of brace-sets
const pre = m.pre;
const post = m.post.length ? expand_(m.post, max, false) : [''];
if (/\$$/.test(m.pre)) {
for (let k = 0; k < post.length && k < max; k++) {
const expansion = pre + '{' + m.body + '}' + post[k];
expansions.push(expansion);
}
}
else {
const isNumericSequence = /^-?\d+\.\.-?\d+(?:\.\.-?\d+)?$/.test(m.body);
const isAlphaSequence = /^[a-zA-Z]\.\.[a-zA-Z](?:\.\.-?\d+)?$/.test(m.body);
const isSequence = isNumericSequence || isAlphaSequence;
const isOptions = m.body.indexOf(',') >= 0;
if (!isSequence && !isOptions) {
// {a},b}
if (m.post.match(/,(?!,).*\}/)) {
str = m.pre + '{' + m.body + escClose + m.post;
return expand_(str, max, true);
}
return [str];
}
let n;
if (isSequence) {
n = m.body.split(/\.\./);
}
else {
n = parseCommaParts(m.body);
if (n.length === 1 && n[0] !== undefined) {
// x{{a,b}}y ==> x{a}y x{b}y
n = expand_(n[0], max, false).map(embrace);
//XXX is this necessary? Can't seem to hit it in tests.
/* c8 ignore start */
if (n.length === 1) {
return post.map(p => m.pre + n[0] + p);
}
/* c8 ignore stop */
}
}
// at this point, n is the parts, and we know it's not a comma set
// with a single entry.
let N;
if (isSequence && n[0] !== undefined && n[1] !== undefined) {
const x = numeric(n[0]);
const y = numeric(n[1]);
const width = Math.max(n[0].length, n[1].length);
let incr = n.length === 3 && n[2] !== undefined ? Math.abs(numeric(n[2])) : 1;
let test = lte;
const reverse = y < x;
if (reverse) {
incr *= -1;
test = gte;
}
const pad = n.some(isPadded);
N = [];
for (let i = x; test(i, y); i += incr) {
let c;
if (isAlphaSequence) {
c = String.fromCharCode(i);
if (c === '\\') {
c = '';
}
}
else {
c = String(i);
if (pad) {
const need = width - c.length;
if (need > 0) {
const z = new Array(need + 1).join('0');
if (i < 0) {
c = '-' + z + c.slice(1);
}
else {
c = z + c;
}
}
}
}
N.push(c);
}
}
else {
N = [];
for (let j = 0; j < n.length; j++) {
N.push.apply(N, expand_(n[j], max, false));
}
}
for (let j = 0; j < N.length; j++) {
for (let k = 0; k < post.length && expansions.length < max; k++) {
const expansion = pre + N[j] + post[k];
if (!isTop || isSequence || expansion) {
expansions.push(expansion);
}
}
}
}
return expansions;
}
//# sourceMappingURL=index.js.map