63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
'use strict';
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const fill = require('fill-range');
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const utils = require('./utils');
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const compile = (ast, options = {}) => {
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const maxDepth = typeof options.maxDepth === 'number' ? options.maxDepth : 64;
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const walk = (node, parent = {}, depth = 0) => {
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if (depth > maxDepth) {
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throw new RangeError('input exceeds maximum nesting depth. Use options.maxDepth to increase or disable the limit.');
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}
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const invalidBlock = utils.isInvalidBrace(parent);
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const invalidNode = node.invalid === true && options.escapeInvalid === true;
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const invalid = invalidBlock === true || invalidNode === true;
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const prefix = options.escapeInvalid === true ? '\\' : '';
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let output = '';
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if (node.isOpen === true) {
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return prefix + node.value;
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}
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if (node.isClose === true) {
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return prefix + node.value;
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}
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if (node.type === 'open') {
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return invalid ? prefix + node.value : '(';
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}
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if (node.type === 'close') {
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return invalid ? prefix + node.value : ')';
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}
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if (node.type === 'comma') {
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return node.prev.type === 'comma' ? '' : invalid ? node.value : '|';
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}
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if (node.value) {
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return node.value;
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}
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if (node.nodes && node.ranges > 0) {
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const args = utils.reduce(node.nodes);
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const range = fill(...args, { ...options, wrap: false, toRegex: true, strictZeros: true });
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if (range.length !== 0) {
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return args.length > 1 && range.length > 1 ? `(${range})` : range;
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}
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}
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if (node.nodes) {
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for (const child of node.nodes) {
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output += walk(child, node, depth + 1);
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}
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}
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return output;
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};
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return walk(ast);
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};
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module.exports = compile;
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