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266 lines
8.5 KiB
Plaintext
266 lines
8.5 KiB
Plaintext
header
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{
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using System.IO;
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using System.Globalization;
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using TokenStreamSelector = antlr.TokenStreamSelector;
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}
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options
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{
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language = "CSharp";
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namespace = "RusticiSoftware.Translator";
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}
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/*
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[The "BSD licence"]
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Copyright (c) 2002-2005 Kunle Odutola
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All rights reserved.
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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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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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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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/// <summary>
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/// A Preprocessor Lexer for the C# Language
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/// </summary>
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///
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/// <remarks>
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/// <para>
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/// The Lexer defined below is designed to match and identify only tokens related to the
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/// handling of preprocessing directives for the C# language in the source text. It is
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/// designed to match the tokens that can occur after any of the following directives
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/// (on the same line):
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/// <list type="bullet">
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/// <item>
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/// <term>#define</term>
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/// </item>
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/// <item>
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/// <term>#undefine</term>
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/// </item>
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/// <item>
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/// <term>#if</term>
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/// </item>
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/// <item>
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/// <term>#elif</term>
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/// </item>
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/// <item>
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/// <term>#else</term>
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/// </item>
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/// <item>
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/// <term>#endif</term>
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/// </item>
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/// <item>
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/// <term>#line</term>
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/// </item>
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/// </list>
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/// </para>
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///
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/// <para>
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/// This preprocessing lexer is designed to work in tandem with the C# Lexer defined
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/// in the CSharpLexer.g file. In order words, the lexing of all the input not handled
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/// here is assumed to be handled by the other C# Lexer. This other C# Lexer may or may
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/// not be aware of C# preprocessing directives. The co-operation is implemented via
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/// ANTLR's TokenStreamSelector mechanism.
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/// </para>
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///
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/// <para>
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/// The operation of this C# preprocessing lexer is based on the "C# Language Specification"
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/// as documented in the ECMA-334 standard dated December 2001.
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/// </para>
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///
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/// <para>
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/// History
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/// </para>
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///
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/// <para>
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/// 26-Jan-2003 kunle Derived this Lexer from the original combined grammar <br/>
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/// 28-Jan-2003 kunle Retired this Lexer in favour of single-lexer approach <br/>
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/// 25-Feb-2003 kunle Revived this Lexer after issues with single-lexer approach <br/>
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/// </para>
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///
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*/
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class CSharpPreprocessorLexer extends CSharpLexerBase;
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options
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{
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importVocab = CSharpLexerBase;
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exportVocab = CSharpPreprocess;
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charVocabulary = '\u0000'..'\uFFFE'; // All UNICODE characters except \uFFFF [and \u0000 to \u0002 used by ANTLR]
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k = 3; // three characters of lookahead
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testLiterals = false; // don't automatically test for literals
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//defaultErrorHandler = true;
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defaultErrorHandler = false;
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codeGenMakeSwitchThreshold = 5; // Some optimizations
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codeGenBitsetTestThreshold = 5;
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}
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{
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/// <summary>
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/// A <see cref="TokenStreamSelector"> for switching between this Lexer and the C#-only Lexer.
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/// </summary>
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private TokenStreamSelector selector_;
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/// <summary>
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/// A <see cref="TokenStreamSelector"> for switching between this Lexer and the C#-only Lexer.
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/// </summary>
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public TokenStreamSelector Selector
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{
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get { return selector_; }
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set { selector_ = value; }
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}
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private FileInfo _fileinfo = null;
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/// <summary>
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/// Update _fileinfo member whenever filename changes.
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/// </summary>
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public override void setFilename(string f)
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{
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base.setFilename(f);
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_fileinfo = new FileInfo(f);
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}
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/// <summary>
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/// Ensures all tokens have access to the source file's details.
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/// </summary>
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protected override IToken makeToken(int t)
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{
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IToken result = base.makeToken(t);
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CustomHiddenStreamToken customToken = result as CustomHiddenStreamToken;
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if ( customToken != null )
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{
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customToken.File = _fileinfo;
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}
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return result;
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}
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public bool IsLetterCharacter(string s)
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{
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return ( (UnicodeCategory.LowercaseLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Ll
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(UnicodeCategory.ModifierLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lm
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(UnicodeCategory.OtherLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lo
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(UnicodeCategory.TitlecaseLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lt
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(UnicodeCategory.UppercaseLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lu
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(UnicodeCategory.LetterNumber == Char.GetUnicodeCategory(s, 1)) //UNICODE class Nl
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);
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}
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public bool IsIdentifierCharacter(string s)
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{
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return ( (UnicodeCategory.LowercaseLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Ll
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(UnicodeCategory.ModifierLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lm
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(UnicodeCategory.OtherLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lo
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(UnicodeCategory.TitlecaseLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lt
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(UnicodeCategory.UppercaseLetter == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Lu
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(UnicodeCategory.LetterNumber == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Nl
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(UnicodeCategory.NonSpacingMark == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Mn
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(UnicodeCategory.SpacingCombiningMark == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Mc
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(UnicodeCategory.DecimalDigitNumber == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Nd
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(UnicodeCategory.ConnectorPunctuation == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Pc
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(UnicodeCategory.Format == Char.GetUnicodeCategory(s, 1)) //UNICODE class Cf
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);
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}
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public bool IsCombiningCharacter(string s)
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{
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return ( (UnicodeCategory.NonSpacingMark == Char.GetUnicodeCategory(s, 1)) || //UNICODE class Mn
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(UnicodeCategory.SpacingCombiningMark == Char.GetUnicodeCategory(s, 1)) //UNICODE class Mc
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);
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}
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}
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//======================================
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// Start of Lexer Rules
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//======================================
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PP_IDENT
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options { testLiterals = true; }
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: ( '_'
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| LETTER_CHARACTER
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| { IsLetterCharacter(eseq.getText()) }? eseq:UNICODE_ESCAPE_SEQUENCE
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)
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( LETTER_CHARACTER
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| DECIMAL_DIGIT_CHARACTER
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| CONNECTING_CHARACTER
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| COMBINING_CHARACTER
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| FORMATTING_CHARACTER
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| { IsIdentifierCharacter(eseq2.getText()) }? eseq2:UNICODE_ESCAPE_SEQUENCE
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)*
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;
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PP_FILENAME
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: '"'
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( ~( '"' | '\r' | '\n' | '\u2028' | '\u2029' ) )*
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'"'
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;
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PP_NUMBER
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: (DECIMAL_DIGIT)+
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;
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//======================================
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// Section A.1.3 Comments
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//
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SL_COMMENT
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: "//" ( NOT_NEWLINE )*
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// (NEWLINE)?
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//
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( ('\r' ( options { generateAmbigWarnings=false; } : '\n' )?
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| '\n'
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| '\u2028'
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| '\u2029'
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)
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{ newline(); }
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)?
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{ selector_.pop(); }
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;
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//======================================
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// Section A.1.1 Line terminators
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//
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NEWLINE
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: ( '\r' // MacOS-style newline
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( options { generateAmbigWarnings=false; }
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: '\n' // DOS/Windows style newline
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)?
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| '\n' // UNIX-style newline
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| '\u2028' // UNICODE line separator
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| '\u2029' // UNICODE paragraph separator
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)
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{ newline();
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selector_.pop();
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}
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;
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WHITESPACE
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: (NON_NEWLINE_WHITESPACE)+
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;
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