bitbox-compiler/lib/pair/index.js

bitbox /unbox

'use strict';

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.default = pair;
/** Pair matched brakets
	( left: string, right: string, input: string )
	*/

function pair(a, b, str) {

	var bal = 0;
	var m = {};
	var ended = false;

	for (var i = 0; i < str.length; i++) {
		if (a == str.substr(i, a.length)) {
			if (!('start' in m)) m.start = i;
			bal++;
		} else if (b == str.substr(i, b.length) && 'start' in m) {
			ended = true;
			bal--;
			if (!bal) {
				m.end = i;
				m.pre = str.substr(0, m.start);
				m.body = m.end - m.start > 1 ? str.substring(m.start + a.length, m.end) : '';
				m.post = str.slice(m.end + b.length);
				return m;
			}
		}
	}

	// if we opened more than we closed, find the one we closed
	if (bal && ended) {
		var start = m.start + a.length;
		m = pair(a, b, str.substr(start));
		if (m) {
			m.start += start;
			m.end += start;
			m.pre = str.slice(0, start) + m.pre;
		}
		return m;
	}
}
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