Thread: workin' on a scripting engine....

If you're using C++, just use a map.

Yeah, it's really cool to create your own programming language.
Actually I was thinking of implementing a similar library for Omicron.

I tested your compiler and code and it seemed to work fine.

One thing that is useful is named variables, only numbers can be a little too esoteric, especially since you're targeting newbies.

5) Any command without parameters must NOT have any parenthesis....that should make logical sense, lol

Hmm, actually ( and ) are quite useful in long expressions.

Originally posted by jverkoey
a what? never heard of maps before in C++....

Code:

#include <map>
#include <iostream>
#include <string>
int main()
{
  using namespace std;
  
  map<string,int> myMap;

  myMap["one"] = 1;
  myMap["two"] = 2;
  ...
  myMap["zero"] = 0;

  cout << "Type in a number (as text) ";
  string s;
  cin >> s;

  cout << "You typed in " << myMap[s];
}

A map<string,double> is perfect to store variables. I'm using that technique in Omicron.

Originally posted by Sang-drax

Code:

#include <map>
#include <iostream>
#include <string>
int main()
{
  using namespace std;
  
  map<string,int> myMap;

  myMap["one"] = 1;
  myMap["two"] = 2;
  ...
  myMap["zero"] = 0;

  cout << "Type in a number (as text) ";
  string s;
  cin >> s;

  cout << "You typed in " << myMap[s];
}

A map<string,double> is perfect to store variables. I'm using that technique in Omicron.

ok..........hmmmmm...........thinking...........

ok

i think i have an idea


how's about, with the maps, if i do something like this:

i'll have mutliple maps, one for each type of variable (character arrays, float, and ints), so it'll probably be something like this:

map<char[40] [NUMVARS],int> integers;
map<char[40] [NUMVARS],float> floats;
map<char[40] [NUMVARS],char[1024]> chars;

-edit-
and 40 could possibly not the most amount of variables you could have, I could (theoretically) just resize it every time they got more than that..........
-end of edit-

oook, and that theoretically works (i'll need feedback on this, cuz i just found out about maps )

and then, once I have those declared, if I want to create a variable, I would do something like so:

@char <name>
@int <name>
@float <name>

where name would be the name of the variable

and then the engine would read that in from the file and see that it starts with an @ sign, and go in to variable declaration mode. It would then assign the name given to it to <mapname>[<charname]

ex: you declared a @char name; , the engine would read that in, and assign "name" to the first available slot on the map. then, if you wanted to assign something to the variable, you'd just do: @<name>=<value>; and that would assign <value> to the corresponding <name> spot on the map.......this is assuming that what I assumed is correct, lol

so, any input? i have NO idea as to whether or not this'll work....and it'll probably take me a while to implement (it took me about 2 hours just to implement the @<number> system, but I have to admit, that one IS kinda static....)

err, and with the maps, I must be either A) missing something, or B) Visual Studio doesn't like maps.........because they aren't compiling (even though I included all the header files...)

I'm assuming there's probably a library i need, but I dont' know which one.......

-edit-

added the namespace thing (which i don't like using that much) to the file, and all of a sudden, 68 errors popped up, that's why i don't use it I'm assuming that you HAVE to use the namespace thing, but if I won't be able to program anything else because of it, i'm just gonna screw the map things...........

Originally posted by jverkoey
err, and with the maps, I must be either A) missing something, or B) Visual Studio doesn't like maps.........because they aren't compiling (even though I included all the header files...)

I'm assuming there's probably a library i need, but I dont' know which one.......

Probably A), because Visual Studio likes maps. No library is needed, maps are part of C++.

Originally posted by jverkoey

added the namespace thing (which i don't like using that much) to the file, and all of a sudden, 68 errors popped up, that's why i don't use it I'm assuming that you HAVE to use the namespace thing, but if I won't be able to program anything else because of it, i'm just gonna screw the map things...........

Remember to use correct headers, like <iostream> instead of <iostream.h>. Can you compile my example?

well, thing is, i'm not using Dos console stuff, i'm using an API, so I don't even have the iostream.h header file, these are all the header files I have for my scripting engine:

#include <fstream.h>
#include <string.h>
#include <windows.h>
#include <ctype.h>
#include "map.h"

and map.h is a header i just created myself cuz i'm frustrated with the maps GRR

this is the map.h header file:

Code:

#define BOOLEAN		1
#define CHARACTER	2
#define FLOAT		3
#define INTEGER		4

class map
{
private:
	char name[100];
	int type;
	bool bvalue;
	char cvalue[1024];
	float fvalue;
	int ivalue;
	bool used;
public:
	map();
	void create(char* Name,int Type);
	bool createB(bool value);
	bool createC(char* value);
	bool createF(float value);
	bool createI(int value);
};

map::map()
{
	used=false;
}

void map::create(char* Name, int Type)
{
	strcpy(name,Name);
	type=Type;
	used=true;
}

bool map::createB(bool value)
{
	if(type==BOOLEAN)
	{
		bvalue=value;
		return true;
	}
	return false;
}

bool map::createC(char* value)
{
	if(type==CHARACTER)
	{
		strcpy(cvalue,value);
		return true;
	}
	return false;
}

bool map::createF(float value)
{
	if(type==FLOAT)
	{
		fvalue=value;
		return true;
	}
	return false;
}

bool map::createI(int value)
{
	if(type==INTEGER)
	{
		ivalue=value;
		return true;
	}
	return false;
}

that all theoretically works, right now i'm putting it in to the engine.......

-edit-

ok, i've put it in the engine, and now I can create variables....just working on all the debugging for that, then i'm going to make it so you can use the variables

Originally posted by jverkoey
well, thing is, i'm not using Dos console stuff, i'm using an API, so I don't even have the iostream.h header file, these are all the header files I have for my scripting engine:

#include <fstream.h>
#include <string.h>
#include <windows.h>
#include <ctype.h>
#include "map.h"

That should read (or else the map header might not work):

Code:

#include <fstream>
#include <cstring>
#include <windows.h>
#include <ctype.h>
using namespace std;
#include "map.h"

If you want different data types, I suggest creating a "datatype" class:

Code:

class DataType
{ 
    enum Type {Int,String,Float};
    
    int intValue;
    string stringValue;
    float floatValue;
    ...

public:
    DataType(string s);
    DataType(int i);
    ...

    string GetString();
    ...
};

//This map holds all your variables
std::map<string,DataType> variables;

Originally posted by jverkoey
whooohoo, my 100th post!

*sniff* i knew, *sniff* this day would come, *sniff* i am now *sniff* a senior!!

What a waste of a post. :P