/*
 * 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) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
 * Portions Copyright (c) 2017, Chris Fraire <cfraire@me.com>.
 */

Identifier = {Symbol}

Number = ({NumberLong} | {NumberDecimal} | {NumberSci} | {NumberHex} |
    {NumberBinary} | {NumberCrazy} | {NumberRatio})
NumberLong = [\-\+]?[0-9]+
NumberDecimal = [\-\+]?[0-9]*\.[0-9]+
NumberSci = ({NumberLong} | {NumberDecimal}) ([eE][+-]?[0-9]+)?
NumberHex = 0[Xx][0-9A-Fa-f]+
NumberBinary = 2[Rr][01]+
NumberCrazy = 36[Rr][0-9A-Za-z]+
NumberRatio = {NumberLong}"/"{NumberLong}

/*
 * Symbols
 *
 * Symbols begin with a non-numeric character and can contain alphanumeric
 * characters and *, +, !, -, _, ', and ? (other characters may be allowed
 * eventually).
 *
 * N.b. under "Macro Characters", the Quote (') macro is defined -- and that
 * section implies that Symbols cannot begin with \'
 */
Symbol = ({SymbolNormal} | {SymbolSlashed} | {SymbolDotted} | {SymbolColon})
SymbolNormal = {SymCharLead} {SymCharAny}*
SymCharSpecial = [\*\+\!\-_\'\?]
SymCharLead = ([A-Za-z] | [[\*\+\!\-_\'\?]--\']) // i.e. [{SymCharSpecial}--\']
SymCharAlphanum = [A-Za-z0-9]
SymCharAny = ({SymCharAlphanum} | {SymCharSpecial})
/*
 * '/' has special meaning, it can be used once in the middle of a symbol to
 * separate the namespace from the name, e.g. my-namespace/foo. '/' by itself
 * names the division function.
 */
SymbolSlashed = {SymbolNormal} "/" {SymCharAny}+
/*
 * '.' has special meaning - it can be used one or more times in the middle of
 * a symbol to designate a fully-qualified class name, e.g. java.util.BitSet,
 * or in namespace names. Symbols beginning or ending with '.' are reserved by
 * Clojure. Symbols containing / or . are said to be 'qualified'.
 */
SymbolDotted = {SymbolNormal} ("." {SymCharAny}+)+
/*
 * Symbols beginning or ending with ':' are reserved by Clojure. A symbol can
 * contain one or more non-repeating ':'s.
 */
SymbolColon = (":" {SymCharAny}+ ":"? | {SymCharAny}+ ":")