104 lines
3.4 KiB
C#
104 lines
3.4 KiB
C#
/*
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* [The "BSD license"]
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* Copyright (c) 2014 Terence Parr
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* Copyright (c) 2014 Sam Harwell
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* Copyright (c) 2017 Chan Chung Kwong
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using Antlr4.Runtime;
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using System;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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namespace MarketAlly.IronJava.Core.Grammar
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{
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public abstract class Java9LexerBase : Lexer
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{
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private readonly ICharStream _input;
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protected Java9LexerBase(ICharStream input, TextWriter output, TextWriter errorOutput)
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: base(input, output, errorOutput) {
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_input = input;
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}
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private class Character
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{
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public static bool isJavaIdentifierPart(int c)
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{
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if (Char.IsLetter((char)c))
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return true;
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else if (c == (int)'$')
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return true;
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else if (c == (int)'_')
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return true;
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else if (Char.IsDigit((char)c))
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return true;
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else if (Char.IsNumber((char)c))
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return true;
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return false;
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}
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public static bool isJavaIdentifierStart(int c)
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{
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if (Char.IsLetter((char)c))
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return true;
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else if (c == (int)'$')
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return true;
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else if (c == (int)'_')
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return true;
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return false;
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}
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public static int toCodePoint(int high, int low)
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{
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return Char.ConvertToUtf32((char)high, (char)low);
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}
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}
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public bool Check1()
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{
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return Character.isJavaIdentifierStart(_input.LA(-1));
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}
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public bool Check2()
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{
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return Character.isJavaIdentifierStart(Character.toCodePoint((char)_input.LA(-2), (char)_input.LA(-1)));
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}
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public bool Check3()
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{
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return Character.isJavaIdentifierPart(_input.LA(-1));
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}
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public bool Check4()
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{
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return Character.isJavaIdentifierPart(Character.toCodePoint((char)_input.LA(-2), (char)_input.LA(-1)));
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}
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}
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}
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