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Re: Esc: how to convert from string to number (or integer)? [message #3065 is a reply to message #3064]

Fri, 05 May 2006 18:24

mirek
Messages: 13980
Registered: November 2005

Ultimate Member

fudadmin wrote on Fri, 05 May 2006 12:16

luzr wrote on Fri, 05 May 2006 13:37

fudadmin wrote on Fri, 05 May 2006 07:52

If that not exists, then I'll try to write in EscStdLib... It might be more useful later?

It might be. I think, as long as there is to_string, there likely should be some sort of atoi (or to_int)?

Go on, do it, post here, I will add it to EscStdLib. (actually, it will be about 5 lines Wink

Mirek

//in EscStdLib.cpp
//aris +8lines
void ESC_to_number(EscEscape& e)
{
	if(e[0].IsArray()){
		String  s=e[0];
		double  d = ScanDouble(s);
		e = e[0].ToNumber(d);
	}
}
//... 

void StdLib(ArrayMap<String, EscValue>& global)
{
	Escape(global, "is_number(value)", ESC_is_number);
	Escape(global, "is_array(value)", ESC_is_array);
	Escape(global, "is_map(value)", ESC_is_map);
	Escape(global, "is_void(value)", ESC_is_void);
	Escape(global, "int(value)", ESC_int);
	Escape(global, "to_string(value)", ESC_to_string);
//aris +1 line
	Escape(global, "to_number(value)", ESC_to_number); 

//...
//in Esc.h
	double                 GetNumber() const     { return IsNumber() ? number : 0; }
	bool                   IsInt() const;
	int                    GetInt() const;
//aris +1 line
	double               ToNumber(double n)   { Free(); number=n; type = ESC_NUMBER; return n;}

10lines=2*5lines ... Smile

I was lazy to go into the details and haven't tested it extensively. But it works for me...
Is it correct from your point of view?

Not quite optimal.... This is simpler and not adding weird methods to EscValue:

void ESC_to_number(EscEscape& e)
{
	if(e[0].IsArray())
		e = ScanDouble((String)e[0]);
}

(now in U++)

Mirek

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