Function read_num

front-end/UglifyJS/parse-js.js:340–372

(prefix)

        };

        function read_num(prefix) {
                var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".";
                var num = read_while(function(ch, i){
                        if (ch == "x" || ch == "X") {
                                if (has_x) return false;
                                return has_x = true;
                        }
                        if (!has_x && (ch == "E" || ch == "e")) {
                                if (has_e) return false;
                                return has_e = after_e = true;
                        }
                        if (ch == "-") {
                                if (after_e || (i == 0 && !prefix)) return true;
                                return false;
                        }
                        if (ch == "+") return after_e;
                        after_e = false;
                        if (ch == ".") {
                                if (!has_dot)
                                        return has_dot = true;
                                return false;
                        }
                        return is_alphanumeric_char(ch);
                });
                if (prefix)
                        num = prefix + num;
                var valid = parse_js_number(num);
                if (!isNaN(valid)) {
                        return token("num", valid);
                } else {
                        parse_error("Invalid syntax: " + num);
                }
        };

        function read_escaped_char() {
                var ch = next(true);