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'use strict';
const fill = require('fill-range');
const stringify = require('./stringify');
const utils = require('./utils');
const append = (queue = '', stash = '', enclose = false) => {
let result = [];
queue = [].concat(queue);
stash = [].concat(stash);
if (!stash.length) return queue;
if (!queue.length) {
return enclose ? utils.flatten(stash).map(ele => `{${ele}}`) : stash;
}
for (let item of queue) {
if (Array.isArray(item)) {
for (let value of item) {
result.push(append(value, stash, enclose));
}
} else {
for (let ele of stash) {
if (enclose === true && typeof ele === 'string') ele = `{${ele}}`;
result.push(Array.isArray(ele) ? append(item, ele, enclose) : (item + ele));
}
}
}
return utils.flatten(result);
};
const expand = (ast, options = {}) => {
let rangeLimit = options.rangeLimit === void 0 ? 1000 : options.rangeLimit;
let walk = (node, parent = {}) => {
node.queue = [];
let p = parent;
let q = parent.queue;
while (p.type !== 'brace' && p.type !== 'root' && p.parent) {
p = p.parent;
q = p.queue;
}
if (node.invalid || node.dollar) {
q.push(append(q.pop(), stringify(node, options)));
return;
}
if (node.type === 'brace' && node.invalid !== true && node.nodes.length === 2) {
q.push(append(q.pop(), ['{}']));
return;
}
if (node.nodes && node.ranges > 0) {
let args = utils.reduce(node.nodes);
if (utils.exceedsLimit(...args, options.step, rangeLimit)) {
throw new RangeError('expanded array length exceeds range limit. Use options.rangeLimit to increase or disable the limit.');
}
let range = fill(...args, options);
if (range.length === 0) {
range = stringify(node, options);
}
q.push(append(q.pop(), range));
node.nodes = [];
return;
}
let enclose = utils.encloseBrace(node);
let queue = node.queue;
let block = node;
while (block.type !== 'brace' && block.type !== 'root' && block.parent) {
block = block.parent;
queue = block.queue;
}
for (let i = 0; i < node.nodes.length; i++) {
let child = node.nodes[i];
if (child.type === 'comma' && node.type === 'brace') {
if (i === 1) queue.push('');
queue.push('');
continue;
}
if (child.type === 'close') {
q.push(append(q.pop(), queue, enclose));
continue;
}
if (child.value && child.type !== 'open') {
queue.push(append(queue.pop(), child.value));
continue;
}
if (child.nodes) {
walk(child, node);
}
}
return queue;
};
return utils.flatten(walk(ast));
};
module.exports = expand;