expander.h

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//
// C++ Interface: expander
//
// Description: 
//
//
// Author: Jonas B�r (C) 2004
//
// Copyright: See COPYING file that comes with this distribution
//
//

#ifndef EXPANDER_H
#define EXPANDER_H

// class QString;
#include <qstring.h>
#include <qstringlist.h>
#include <qvaluelist.h>
#include "tstring.h"
// #include <qstringlist.h>
class ListPanel;
class Expander;
class Error;

typedef TagString_t<QStringList> TagString;
typedef QValueList<TagString> TagStringList;

/**
 * This holds informations about each parameter
 */
class exp_parameter {
public:
	exp_parameter() {}
   inline exp_parameter( QString desc, QString pre, bool ness)
      { _description = desc; _preset = pre; _nessesary = ness; }
   inline QString description() const ///< A description of the parameter
      { return _description; }
   inline QString preset() const ///< the default of the parameter
      { return _preset; }
   inline bool nessesary() const ///< false if the parameter is optional
      { return _nessesary; }

private:
   QString _description;
   QString _preset;
   bool _nessesary;
};

#define EXP_FUNC virtual TagString expFunc ( const ListPanel*, const TagStringList&, const bool&, Expander& ) const
#define SIMPLE_EXP_FUNC virtual TagString expFunc ( const ListPanel*, const QStringList&, const bool&, Expander& ) const
/** 
  *  Abstract baseclass for all expander-functions (which replace placeholder).
  *  A Placeholder is an entry containing the expression, its expanding function and Parameter.
  *
 * Not to be created on the heap
  *
  * @author Jonas B�r (http://www.jonas-baehr.de)
  */
class exp_placeholder {
public:
   inline QString expression() const  ///< The placeholder (without '%' or panel-prefix)
      { return _expression; }
   inline QString description() const ///< A description of the placeholder
      { return _description; }
   inline bool needPanel() const ///< true if the placeholder needs a panel to operate on
      { return _needPanel; }
   inline void addParameter( exp_parameter parameter ) ///< adds parameter to the placeholder
      { _parameter.append(parameter); }
   inline int parameterCount() const ///< returns the number of placeholders
      { return _parameter.count(); }
   inline const exp_parameter& parameter( int id ) const ///< returns a specific parameter
      { return _parameter[ id ]; }

   EXP_FUNC = 0;
protected:
	static void setError(Expander& exp,const Error& e) ;
	static void panelMissingError(const QString &s, Expander& exp);
	static QStringList splitEach(const TagString& s);
	static QStringList fileList(const ListPanel* const panel,const QString& type,const QString& mask,const bool ommitPath,const bool useUrl,Expander&,const QString&);
	exp_placeholder();
	exp_placeholder(const exp_placeholder& p);
	~exp_placeholder() { }
   QString _expression;
   QString _description;
   QValueList <exp_parameter> _parameter;
   bool _needPanel;
};


	class Error {
	public:
		enum Cause {
			C_USER, C_SYNTAX, C_WORLD, C_ARGUMENT
		};
		enum Severity {
			S_OK, S_WARNING, S_ERROR, S_FATAL
		};
		Error() : s_(S_OK) {}
		Error(Severity s,Cause c,QString d) : s_(s), c_(c), desc_(d) {}
		Cause cause() const { return c_; }
		operator bool() const { return s_!=S_OK; }
		const QString& what() const { return desc_; }
	private:
		Severity s_;
		Cause c_;
		QString desc_;
	};


/**
 * The Expander expands the command of an UserAction by replacing all placeholders by thier current values.@n
 * Each placeholder begins with a '%'-sign, followed by one char indicating the panel, followed by a command which may have some paramenter enclosed in brackets and also ends with a '%'-sign.
 * Examples are %aPath% or %rBookmark("/home/jonas/src/krusader_kde3", "yes")%.@n
 * The panel-indicator has to be either 'a' for the active, 'o' for the other, 'r' for the right, 'l' for the left or '_' for panel-independence.
 * 
 * Currently sopported are these commands can be ordered in three groups (childs are the parameter in the right order):
 * - Placeholders for Krusaders panel-data (panel-indicator has to be 'a', 'o', 'r' or 'l')
 *    - @em Path is replaced by the panel's path
 *    - @em Count is replaced by a nomber of
 *       -# Either "All", "Files", "Dirs", "Selected"
 *       .
 *    - @em Filter is preplaced by the panels filter-mask (ex: "*.cpp *.h")
 *    - @em Current is replaced by the current item or, in case of onmultiple="call_each", by each selected item.
 *       -# If "yes", only the filename (without path) is returned
 *       .
 *    - @em List isreplaced by a list of
 *       -# Either "All", "Files", "Dirs", "Selected"
 *       -# A seperator between the items (default: " " [one space])
 *       -# If "yes", only the filename (without path) is returned
 *       -# (for all but "Selected") a filter-mask (default: "*")
 *       .
 *   .
 * - Access to panel-dependent, krusader-internal, parameter-needed functions (panel-indicator has to be 'a', 'o', 'r' or 'l')
 *    - @em Select manipulates the selection of the panel
 *       -# A filter-mask (nessesary)
 *       -# Either "Add", "Remove", "Set" (default)
  *       .
 *    - @em Bookmark manipulates the selection of the panel
 *       -# A path or URL (nessesary)
 *       -# If "yes", the location is opend in a new tab
 *       .
 *   .
 * - Access to panel-independent, krusader-internal, parameter-needed functions (panel-indicator doesn't matter but should be set to '_')
 *    - @em Ask displays a lineedit and is replaced by its return
 *       -# The question (nessesary)
 *       -# A default answer
 *       -# A cation for the popup
 *       .
 *    - @em Clipboard manipulates the system-wide clipboard
 *       -# The string copied to clip (ex: "%aCurrent%") (nessesary)
 *       -# A separator. If set, parameter1 is append with this to the current clipboard content
 *       .
 *    .
 * .
 * Since all placeholders are expanded in the order they appear in the command, little one-line-scripts are possible
 *
 * @author Jonas B�r (http://www.jonas-baehr.de), Shie Erlich
 */
class Expander {
public:
  
   inline static int placeholderCount() ///< returns the number of placeholders
      { return _placeholder().count(); }
   inline static const exp_placeholder* placeholder( int id )
      { return _placeholder()[ id ]; }

   /**
     * This expands a whole commandline
     * 
     * @param stringToExpand the commandline with the placeholder
     * @param useUrl true iff the path's should be expanded to an URL instead of an local path
     * @return a list of all commands
     */
   void expand( const QString& stringToExpand, bool useUrl );
	 
	 /**
	  * Returns the list of all commands to be executed, provided that #expand was called
	  * before, and there was no error (see #error). Otherwise, calls #abort
	  * 
	  * @return The list of commands to be executed
     */
	 const QStringList& result() const { assert(!error()); return resultList; }

	 /**
	  *  Returns the error object of this Expander. You can test whether there was
	  * any error by 
	  * \code
	  * if(exp.error())
	  *		error behaviour...
	  * else
	  *   no error...
	  * \endcode
	  * 
	  * @return The error object
	  */
	 const Error& error() const { return _err; }
protected:
  /**
   * This expands a whole commandline by calling for each Placeholder the corresponding expander
   * 
   * @param stringToExpand the commandline with the placeholder
   * @param useUrl true if the path's should be expanded to an URL instead of an local path
   * @return the expanded commanline for the current item
   */
  TagString expandCurrent( const QString& stringToExpand, bool useUrl );
  /**
   * This function searches for "@EACH"-marks to splitt the string in a list for each %_Each%-item
   * 
   * @param stringToSplit the string which should be splitted
   * @return the splitted list
   */
  static QStringList splitEach( TagString stringToSplit );
  /**
   * @param panelIndicator either '_' for panel-independent placeholders, 'a', 'o', 'r', or 'l' for the active, other (inactive), right or left panel
   * @return a pointer to the right panel or NULL if no panel is needed.
   */
  static ListPanel* getPanel( const char panelIndicator ,const exp_placeholder*,Expander&);
  /**
   *  This splits the parameter-string into separate parameter and expands each
   * @param exp the string holding all parameter
   * @param useUrl true if the path's should be expanded to an URL instead of an local path
   * @return a list of all parameter
   */
  TagStringList separateParameter( QString* const exp, bool useUrl );
  /**
   * This finds the end of a placeholder, taking care of the parameter
   * @return the position where the placeholder ends
   */
  int findEnd( const QString& str, int start );
  
	void setError(const Error &e) { _err=e; }
	friend class exp_placeholder;
  
private:
  static QValueList <const exp_placeholder*>& _placeholder();
	Error _err;
	QStringList resultList;
};

inline void exp_placeholder::setError(Expander& exp,const Error& e) { exp.setError(e); }
inline QStringList exp_placeholder::splitEach(const TagString& s) { return Expander::splitEach(s); }
inline exp_placeholder::exp_placeholder() { Expander::_placeholder().push_back(this); }

#endif // ifndef EXPANDER_H