KWordMacroExpander Class Reference

Abstract base class for simple word macro substitutors. More...

#include <kmacroexpander.h>

Inheritance diagram for KWordMacroExpander:

[legend]

List of all members.

Public Member Functions
	KWordMacroExpander (QChar c= '%')
Protected Member Functions
virtual int	expandEscapedMacro (const QString &str, uint pos, QStringList &ret)
virtual bool	expandMacro (const QString &str, QStringList &ret)=0
virtual int	expandPlainMacro (const QString &str, uint pos, QStringList &ret)

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Detailed Description

Abstract base class for simple word macro substitutors.

Use this instead of the functions in the KMacroExpander namespace if speculatively pre-filling the substitution map would be too expensive.

A typical application:

 class MyClass {
 ...
   private:
     QString m_str;
 ...
   friend class MyExpander;
 };

 class MyExpander : public KWordMacroExpander {
   public:
     MyExpander( MyClass *_that ) : KWordMacroExpander(), that( _that ) {}
   protected:
     virtual bool expandMacro( const QString &str, QStringList &ret );
   private:
     MyClass *that;
 };

 bool MyExpander::expandMacro( const QString &str, QStringList &ret )
 {
   if (str == "macro") {
     ret += complexOperation( that->m_str );
     return true;
   }
   return false;
 }

 ... MyClass::...(...)
 {
   QString str;
   ...
   MyExpander mx( this );
   mx.expandMacrosShellQuote( str );
   ...
 }

Alternatively MyClass could inherit from KWordMacroExpander directly.

Since:

3.3

Author:

Oswald Buddenhagen <ossi@kde.org>

Definition at line 191 of file kmacroexpander.h.

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Constructor & Destructor Documentation

KWordMacroExpander::KWordMacroExpander

(

QChar

c = '%'

)

[inline]

Constructor.

Parameters:

c

escape char indicating start of macros, or QChar::null for none

Definition at line 198 of file kmacroexpander.h.

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Member Function Documentation

int KWordMacroExpander::expandEscapedMacro	(	const QString &	str,
		uint	pos,
		QStringList &	ret
	)			[protected, virtual]

This function is called every time the escape char is found if it is not QChar::null.

It should determine whether the string starting at pos witin str is a valid macro and return the substitution value for it if so.

Parameters:

	str	the input string
	pos	the offset within str. Note that this is the position of the occurrence of the escape char
	ret	return value: the string to substitute for the macro

Returns:

if greater than zero, the number of chars at pos in str to substitute with ret (i.e., a valid macro was found). if less than zero, subtract this value from pos (to skip a macro, i.e., substitute it with itself). zero requests no special action.

Reimplemented from KMacroExpanderBase.

Definition at line 469 of file kmacroexpander.cpp.

virtual bool KWordMacroExpander::expandMacro	(	const QString &	str,
		QStringList &	ret
	)			[protected, pure virtual]

Return substitution list ret for string macro str.

Parameters:

	str	the macro to expand
	ret	return variable reference. It is guaranteed to be empty when expandMacro is entered.

Returns:

true iff chr was a recognized macro name

int KWordMacroExpander::expandPlainMacro	(	const QString &	str,
		uint	pos,
		QStringList &	ret
	)			[protected, virtual]

This function is called for every single char within the string if the escape char is QChar::null.

It should determine whether the string starting at pos within str is a valid macro and return the substitution value for it if so.

Parameters:

	str	the input string
	pos	the offset within str
	ret	return value: the string to substitute for the macro

Returns:

if greater than zero, the number of chars at pos in str to substitute with ret (i.e., a valid macro was found). if less than zero, subtract this value from pos (to skip a macro, i.e., substitute it with itself). zero requests no special action.

Reimplemented from KMacroExpanderBase.

Definition at line 455 of file kmacroexpander.cpp.

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The documentation for this class was generated from the following files:

• kmacroexpander.h
• kmacroexpander.cpp