'use strict';

var test = require('tape'); var isRegex = require('./'); var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';

test('not regexes', function (t) {

t.notOk(isRegex(), 'undefined is not regex');
t.notOk(isRegex(null), 'null is not regex');
t.notOk(isRegex(false), 'false is not regex');
t.notOk(isRegex(true), 'true is not regex');
t.notOk(isRegex(42), 'number is not regex');
t.notOk(isRegex('foo'), 'string is not regex');
t.notOk(isRegex([]), 'array is not regex');
t.notOk(isRegex({}), 'object is not regex');
t.notOk(isRegex(function () {}), 'function is not regex');
t.end();

});

test('@@toStringTag', { skip: !hasToStringTag }, function (t) {

var regex = /a/g;
var fakeRegex = {
        toString: function () { return String(regex); },
        valueOf: function () { return regex; }
};
fakeRegex[Symbol.toStringTag] = 'RegExp';
t.notOk(isRegex(fakeRegex), 'fake RegExp with @@toStringTag "RegExp" is not regex');
t.end();

});

test('regexes', function (t) {

t.ok(isRegex(/a/g), 'regex literal is regex');
t.ok(isRegex(new RegExp('a', 'g')), 'regex object is regex');
t.end();

});

test('does not mutate regexes', function (t) {

t.test('lastIndex is a marker object', function (st) {
        var regex = /a/;
        var marker = {};
        regex.lastIndex = marker;
        st.equal(regex.lastIndex, marker, 'lastIndex is the marker object');
        st.ok(isRegex(regex), 'is regex');
        st.equal(regex.lastIndex, marker, 'lastIndex is the marker object after isRegex');
        st.end();
});

t.test('lastIndex is nonzero', function (st) {
        var regex = /a/;
        regex.lastIndex = 3;
        st.equal(regex.lastIndex, 3, 'lastIndex is 3');
        st.ok(isRegex(regex), 'is regex');
        st.equal(regex.lastIndex, 3, 'lastIndex is 3 after isRegex');
        st.end();
});

t.end();

});