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/***************************************************************************
*
* Copyright (C) 2005 Elad Lahav (elad_lahav@users.sourceforge.net)
*
* 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.
*
* 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.
*
***************************************************************************/
#ifndef FRONTEND_H
#define FRONTEND_H
#include <qobject.h>
#include <kprocess.h>
/**
* Represents a single token in the parsed output stream.
* @author Elad Lahav
*/
class FrontendToken
{
public:
/**
* Class constructor.
*/
FrontendToken() : m_pNext(NULL) {}
/**
* @return The text associated with this token
*/
const QString& getData() const { return m_sData; }
/**
* @return A pointer to the next token in the strem.
*/
FrontendToken* getNext() const { return m_pNext; }
protected:
/** Free text associated with the token. */
QString m_sData;
/** A pointer to the next token in the stream. */
FrontendToken* m_pNext;
friend class Frontend;
};
/**
* Abstract base class that provides a front-end to console-based programmes.
* Provides a parsing infrastructure which is based on a list of records, all
* of the same structure. Each record is composed of a number of delimited
* fields (tokens.)
* @author Elad Lahav
*/
class Frontend : public KProcess
{
Q_OBJECT
public:
Frontend(uint, bool bAutoDelete = false);
~Frontend();
virtual bool run(const QString&, const QStringList&,
const QString& sWorkDir = "", bool bBlock = false);
void kill();
/**
* @return An string describing the error which made run() fail
*/
const QString& getRunError() { return m_sError; }
signals:
/**
* Indicates tokens can be read.
* The Frontend object parses the back-end output and creates a list of
* tokens. This signal is emitted when a batch of characters has been
* converted into a token list.
* @param pToken The head of the token list
*/
void dataReady(FrontendToken* pToken);
/**
* Emitted when the back-end process terminates.
* @param nRecords The number of complete records parsed
*/
void finished(uint nRecords);
/**
* Indicates that the Cscope process was terminated.
*/
void aborted();
/**
* This signal is used to report the progress of the back-end process.
* @param nProgress The current progress value
* @param nTotal The progress value that indicates the process
* is finished
*/
void progress(int nProgress, int nTotal);
/**
* Emitted when an error message is produced by the back-end process.
*/
void error(const QString& sMsg);
protected:
/** A set of possible delimiters for parsing process output. */
enum ParserDelim { Newline = 0x01, Space = 0x02, Tab = 0x04,
WSpace = Space | Tab, All = WSpace | Newline };
/** Defines the set of return values for parseStdout(). Determines what
needs to be done with a new token passed to this method. */
enum ParseResult {
DiscardToken /** Delete this token */,
AcceptToken /** Add this token to the list */,
RecordReady /** This token completes a record */,
Abort /** Kill the process */
};
/** Number of complete records read so far. */
uint m_nRecords;
/** The head of the list of parsed output tokens. */
FrontendToken* m_pHeadToken;
/** The tail of the list of parsed output tokens. */
FrontendToken* m_pTailToken;
/** An iterator on the list of parsed output tokens. */
FrontendToken* m_pCurToken;
/** The current delimiters used for parsing the output. */
ParserDelim m_delim;
/** An error string produced if run() fails. */
QString m_sError;
/**
* Handles a text token received on the Standard Output stream of the
* controlled process.
* This is called by slotReadStdout whenever a new token is recognised.
* Inheriting classes should implement this method to parse the resutling
* stream of tokens.
* @param sToken A part of the text received on the Standard Output,
* disected according to current delimiter settings
* @param delim The delimiter that ended this token
* @result A ParseResult value, indicating what should be done with the
* new token
*/
virtual ParseResult parseStdout(QString& sToken, ParserDelim delim) = 0;
virtual void parseStderr(const QString&);
/**
* Called when the process exits.
* Allows inheriting classes to implement process termination handlers.
*/
virtual void finalize() {}
protected slots:
virtual void slotProcessExit(KProcess*);
private:
/** Determines whether the object should be deleted once the process has
exited */
bool m_bAutoDelete;
/** Determines whether the parser is in the middle of a token, or between
two tokens */
bool m_bInToken;
/** The number of fields in each parsed record. Should be defined for
every sub-class. */
uint m_nRecordSize;
/** This flag is raised when kill() is called. It signifies that even
though the process may not be dead yet, it should be considered as
such. */
bool m_bKilled;
void addToken(FrontendToken*);
void removeToken();
void removeRecord();
bool tokenize(char**, int*, QString&, ParserDelim&);
private slots:
void slotReadStdout(KProcess*, char*, int);
void slotReadStderr(KProcess*, char*, int);
};
#endif
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