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Re: why no virtual destructor for RegExp? [message #38887 is a reply to message #38795]

Fri, 25 January 2013 14:58

navi
Messages: 107
Registered: February 2012
Location: Sydney, Australia

Experienced Member

Hi All,

Just an update what I am up to so far. I manage to code a replica of preg_replace of php. due to the difference in nature of variable type, I had to almost 4 overloaded function to match all the things "preg_replace" can do in a single function definition.

	
//===================================================================================
//        My Extension to RegExp
//===================================================================================

protected:	
	bool ReplacePos(String& t, int p, int q, const String r);
	int  Replace0(String& t, Vector<String>& rv, const int& rv_count, int& offset);
	Vector<String> ResolveBackRef(Vector<String>& rv);	
	Vector<String> Make_rv(const String& r);
	

public:	

	int  ReplaceGlobal(String& t, Vector<String>& rv, const String pattern=Null, bool backref=false); //DONE
	int  ReplaceGlobal(String& t, Vector<String>& rv, int offset, const String pattern=Null, bool backref=false); //DONE

	int  ReplaceGlobal(String& t, const String r, const String pattern=Null, bool backref=false); //DONE
	int  ReplaceGlobal(String& t, const String r, int offset, const String pattern=Null, bool backref=false); //DONE

	int  ReplaceGlobal(String& t, Callback cbr, const String pattern=Null, bool backref=false); // NOT YET
	int  ReplaceGlobal(String& t, Callback cbr, int offset, const String pattern=Null, bool backref=false); //NOT YET

My plan is to implement 6 flavor of ReplaceGlobal() and 6 flavor of Replace(). all based on how replace text or callback function are given.

replace text can either be given as single String in Parentheses format just like a regular expression. ie (replace_a)(replace_b)(replace_c). Or can be given a vector containing three Strings. Also callback function can be passed in place of replace texts.

regexp pattern can also be given as argument. instead of setting it using SetPattern()

backref = is a on/off switch for resolving/expanding back reference given in replace text as /1, /2, /3 etc. where the number is the number of the match string cough by the regexp pattern.

Thanks & Regards
Navi

[Updated on: Mon, 28 January 2013 06:52]

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