/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").  
 * You may not use this file except in compliance with the License.
 *
 * See LICENSE.txt included in this distribution for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at LICENSE.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * Portions Copyright (c) 2016 Nikolay Denev.
 * Portions Copyright (c) 2017, Chris Fraire <cfraire@me.com>.
 */

Identifier = ([\p{XID_Start}][\p{XID_Continue}]* | [_][\p{XID_Continue}]+)

HEXDIG = [0-9A-Fa-f]
DIGIT  = [0-9]
OCTDIG = [0-7]
BINDIG = [01]

Integer_suffix = [_]* ("u8" | "i8" | "u16" | "i16" | "u32" | "i32" | "u64" |
    "i64" | "isize" | "usize")
Fp_suffix = [_]* ("f32" | "f64")
Decimal_integer = {DIGIT} ([_]*{DIGIT})* {Integer_suffix}?
Hex_integer = 0[x] {HEXDIG} ([_]*{HEXDIG})* {Integer_suffix}?
Octal_integer = 0[o] {OCTDIG} ([_]*{OCTDIG})* {Integer_suffix}?
Binary_integer = 0[b] {BINDIG} ([_]*{BINDIG})* {Integer_suffix}?
Floating_point = ({DIGIT} ([_]*{DIGIT})* \. {DIGIT} ([_]*{DIGIT})* |
    {DIGIT} ([_]*{DIGIT})*) ([eE][+-]?{DIGIT}+)? {Fp_suffix}?
Number = ({Decimal_integer} | {Hex_integer} | {Octal_integer} |
    {Binary_integer} | {Floating_point})