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/*
 * [The "BSD license"]
 *  Copyright (c) 2014-2015 Gerald Rosenberg
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** 
 * A generally reusable set of fragments for import in to Lexer grammars.
 *
 *	Modified 2015.06.16 gbr - 
 *	-- generalized for inclusion into the ANTLRv4 grammar distribution
 * 
 */
lexer grammar LexBasic;

// ======================================================
// Lexer fragments
//
// -----------------------------------
// Whitespace & Comments

fragment Ws
   : Hws | Vws
   ;


fragment Hws
   : [ \t]
   ;


fragment Vws
   : [\r\n\f]
   ;


fragment BlockComment
   : '/*' .*? ('*/' | EOF)
   ;


fragment DocComment
   : '/**' .*? ('*/' | EOF)
   ;

fragment LineComment
   : '//' ~ [\r\n]*
   ;

// -----------------------------------
// Escapes
// Any kind of escaped character that we can embed within ANTLR literal strings.

fragment EscSeq
   : Esc ([btnfr"'\\] | UnicodeEsc | . | EOF)
   ;


fragment EscAny
   : Esc .
   ;


fragment UnicodeEsc
   : 'u' (HexDigit (HexDigit (HexDigit HexDigit?)?)?)?
   ;

// -----------------------------------
// Numerals

fragment DecimalNumeral
   : '0' | [1-9] DecDigit*
   ;

// -----------------------------------
// Digits

fragment HexDigit
   : [0-9a-fA-F]
   ;


fragment DecDigit
   : [0-9]
   ;

// -----------------------------------
// Literals

fragment BoolLiteral
   : 'true' | 'false'
   ;


fragment CharLiteral
   : SQuote (EscSeq | ~ ['\r\n\\]) SQuote
   ;


fragment SQuoteLiteral
   : SQuote (EscSeq | ~ ['\r\n\\])* SQuote
   ;


fragment DQuoteLiteral
   : DQuote (EscSeq | ~ ["\r\n\\])* DQuote
   ;


fragment USQuoteLiteral
   : SQuote (EscSeq | ~ ['\r\n\\])*
   ;

// -----------------------------------
// Character ranges

fragment NameChar
   : NameStartChar | '0' .. '9' | Underscore | '\u00B7' | '\u0300' .. '\u036F' | '\u203F' .. '\u2040'
   ;


fragment NameStartChar
   : 'A' .. 'Z' | 'a' .. 'z' | '\u00C0' .. '\u00D6' | '\u00D8' .. '\u00F6' | '\u00F8' .. '\u02FF' | '\u0370' .. '\u037D' | '\u037F' .. '\u1FFF' | '\u200C' .. '\u200D' | '\u2070' .. '\u218F' | '\u2C00' .. '\u2FEF' | '\u3001' .. '\uD7FF' | '\uF900' .. '\uFDCF' | '\uFDF0' .. '\uFFFD'
   ;

// ignores | ['\u10000-'\uEFFFF] ;
// -----------------------------------
// Types

fragment Int
   : 'int'
   ;

// -----------------------------------
// Symbols

fragment Esc
   : '\\'
   ;


fragment Colon
   : ':'
   ;


fragment DColon
   : '::'
   ;


fragment SQuote
   : '\''
   ;


fragment DQuote
   : '"'
   ;


fragment LParen
   : '('
   ;


fragment RParen
   : ')'
   ;


fragment LBrace
   : '{'
   ;


fragment RBrace
   : '}'
   ;


fragment LBrack
   : '['
   ;


fragment RBrack
   : ']'
   ;


fragment RArrow
   : '->'
   ;


fragment Lt
   : '<'
   ;


fragment Gt
   : '>'
   ;


fragment Equal
   : '='
   ;


fragment Question
   : '?'
   ;


fragment Star
   : '*'
   ;


fragment Plus
   : '+'
   ;


fragment PlusAssign
   : '+='
   ;


fragment Underscore
   : '_'
   ;


fragment Pipe
   : '|'
   ;


fragment Dollar
   : '$'
   ;


fragment Comma
   : ','
   ;


fragment Semi
   : ';'
   ;


fragment Dot
   : '.'
   ;


fragment Range
   : '..'
   ;


fragment At
   : '@'
   ;


fragment Pound
   : '#'
   ;


fragment Tilde
   : '~'
   ;