Function isSubsetOf

third_party/inputmask/inputmask.js:885–903

(source, target)

                        }
                    }
                    function isSubsetOf(source, target) {
                        function expand(pattern) {
                            var expanded = [], start, end;
                            for (var i = 0, l = pattern.length; i < l; i++) {
                                if (pattern.charAt(i) === "-") {
                                    end = pattern.charCodeAt(i + 1);
                                    while (++start < end) expanded.push(String.fromCharCode(start));
                                } else {
                                    start = pattern.charCodeAt(i);
                                    expanded.push(pattern.charAt(i));
                                }
                            }
                            return expanded.join("");
                        }
                        if (opts.regex && source.match.fn !== null && target.match.fn !== null) {
                            return expand(target.match.def.replace(/[\[\]]/g, "")).indexOf(expand(source.match.def.replace(/[\[\]]/g, ""))) !== -1;
                        }
                        return source.match.def === target.match.nativeDef;
                    }
                    function staticCanMatchDefinition(source, target) {
                        var sloc = source.locator.slice(source.alternation).join(""), tloc = target.locator.slice(target.alternation).join(""), canMatch = sloc == tloc;
                        canMatch = canMatch && source.match.fn === null && target.match.fn !== null ? target.match.fn.test(source.match.def, getMaskSet(), pos, false, opts, false) : false;