// lexer.h+
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// +
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// Copyright (c) 2006 - 2010 Accenture. All rights reserved.+
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// This component and the accompanying materials are made available+
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// under the terms of the "Eclipse Public License v1.0"+
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// which accompanies this distribution, and is available+
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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// +
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// Initial Contributors:+
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// Accenture - Initial contribution+
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//+
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+
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#ifndef __LEXER_H__+
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#define __LEXER_H__+
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+
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#include <e32base.h>+
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+
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class CReservedLookup;+
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+
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+
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class TToken+
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	{+
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public:+
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	enum TType+
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		{+
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		ENull,+
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		EString,+
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		EPipe,+
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		EDoublePipe,+
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		ERedirectStdinFromFile,+
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		ERedirectStdoutToFile,+
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		ERedirectStdoutToFileAppend,+
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		ERedirectStdoutToStderr,+
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		ERedirectStderrToFile,+
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		ERedirectStderrToFileAppend,+
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		ERedirectStderrToStdout,+
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		EAmpersand,+
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		EDoubleAmpersand,+
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		EAmpersandPipe,+
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		ENewLine,+
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		ESemicolon,+
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		EVariable+
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		};+
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public:+
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	TToken();+
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	TToken(TType aType, const TDesC& aToken, TInt aPos);+
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	TToken& operator=(const TToken& aToken);+
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	TType Type() const;+
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	TInt Position() const;+
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	const TDesC& String() const;+
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private:+
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	TType iType;+
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	TPtrC iToken;+
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	TInt iPos;+
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	};+
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+
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+
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class CLexer : public CBase+
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	{+
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public:+
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	enum TBehaviour+
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		{+
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		EHandleSingleQuotes	= 0x00000001,	///< Causes text within single quotes to be reported as a single TToken::EString type token.+
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		EHandleDoubleQuotes	= 0x00000002,	///< Causes text within double quotes to be reported as a single TToken::EString type token.+
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		EHandleComments		= 0x00000004	///< Causes text following a '#' until the end of the line to be discarded.+
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		};+
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public:+
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	static CLexer* NewL();+
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	static CLexer* NewL(TUint aBehaviour);+
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	static CLexer* NewLC();+
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	static CLexer* NewLC(TUint aBehaviour);+
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	~CLexer();+
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	void DefineTokenTypeL(TToken::TType aTokenType, const TDesC& aString);+
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	void Set(const TDesC& aDes, const TChar& aEscapeChar);+
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	TToken NextToken();+
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	TInt CurrentOffset() const;+
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	TBool More();+
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private:+
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	CLexer(TUint aBehaviour);+
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	void ConstructL();+
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	void SkipSingleQuotedChars();+
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	void SkipDoubleQuotedChars();+
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	void SkipComment();+
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	void SkipWhiteSpace();+
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private:+
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	TUint iBehaviour;+
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	TChar iEscapeChar;+
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	TLex iLex;+
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	CReservedLookup* iReservedLookup;+
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	};+
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+
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+
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#endif // __LEXER_H__+
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