Changing accepted tokens with ItemOf().Regex or ExpressionTokens().Token

ID: 72

See: ItemOf(string, int64, int) 
				
					using uCalcSoftware;

var uc = new uCalc();
// (See alternate version of this example using ExpressionTokens instead of ItemOf)

// In this section underscore, _, and numeric digits
// are accepted as part of alphanumeric tokens
uc.DefineVariable("My_Variable = 111");
Console.WriteLine(uc.Error.Message);
uc.DefineVariable("Variable123 = 222");
Console.WriteLine(uc.Error.Message);

Console.WriteLine(uc.ItemOf("_Token_Alphanumeric").Regex);
Console.WriteLine(uc.EvalStr("My_Variable"));
Console.WriteLine(uc.EvalStr("Variable123"));
Console.WriteLine("---");

// Now we no longer want underscore, _, or numeric digits
// to be accepted in alphanumeric tokens; only A-Z
uc.ItemOf("_Token_Alphanumeric").Regex = "[a-zA-Z]+";

uc.DefineVariable("Other_Variable = 333");
Console.WriteLine(uc.Error.Message);
uc.DefineVariable("OtherVariable123 = 444");
Console.WriteLine(uc.Error.Message);

Console.WriteLine(uc.EvalStr("Other_Variable"));
Console.WriteLine(uc.EvalStr("OtherVariable123 "));
Console.WriteLine(uc.EvalStr("My_Variable"));
Console.WriteLine(uc.EvalStr("Variable123"));
Console.WriteLine("---");

//
// We restore the alphanumeric regex to support _ and numbers again
// Note: My_Variable and Variable123 remained; they were simply inaccessible
// Also: We can't use the commented line below because it has the underscore, _,
// character that we had removed.
// uc.ItemOf("_token_alphanumeric").Regex("[a-zA-Z_][a-zA-Z0-9_]*");
uc.ExpressionTokens[TokenType.AlphaNumeric].Regex = "[a-zA-Z_][a-zA-Z0-9_]*";
Console.WriteLine(uc.EvalStr("My_Variable"));
Console.WriteLine(uc.EvalStr("Variable123"));
				
			
No error
No error
[a-zA-Z_][a-zA-Z0-9_]*
111
222
---
Invalid definition
Invalid definition
Undefined identifier
Undefined identifier
Undefined identifier
Undefined identifier
---
111
222
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   // (See alternate version of this example using ExpressionTokens instead of ItemOf)

   // In this section underscore, _, and numeric digits
   // are accepted as part of alphanumeric tokens
   uc.DefineVariable("My_Variable = 111");
   cout << uc.Error().Message() << endl;
   uc.DefineVariable("Variable123 = 222");
   cout << uc.Error().Message() << endl;

   cout << uc.ItemOf("_Token_Alphanumeric").Regex() << endl;
   cout << uc.EvalStr("My_Variable") << endl;
   cout << uc.EvalStr("Variable123") << endl;
   cout << "---" << endl;

   // Now we no longer want underscore, _, or numeric digits
   // to be accepted in alphanumeric tokens; only A-Z
   uc.ItemOf("_Token_Alphanumeric").Regex("[a-zA-Z]+");

   uc.DefineVariable("Other_Variable = 333");
   cout << uc.Error().Message() << endl;
   uc.DefineVariable("OtherVariable123 = 444");
   cout << uc.Error().Message() << endl;

   cout << uc.EvalStr("Other_Variable") << endl;
   cout << uc.EvalStr("OtherVariable123 ") << endl;
   cout << uc.EvalStr("My_Variable") << endl;
   cout << uc.EvalStr("Variable123") << endl;
   cout << "---" << endl;

   //
   // We restore the alphanumeric regex to support _ and numbers again
   // Note: My_Variable and Variable123 remained; they were simply inaccessible
   // Also: We can't use the commented line below because it has the underscore, _,
   // character that we had removed.
   // uc.ItemOf("_token_alphanumeric").Regex("[a-zA-Z_][a-zA-Z0-9_]*");
   uc.ExpressionTokens()[TokenType::AlphaNumeric].Regex("[a-zA-Z_][a-zA-Z0-9_]*");
   cout << uc.EvalStr("My_Variable") << endl;
   cout << uc.EvalStr("Variable123") << endl;
}
				
			
No error
No error
[a-zA-Z_][a-zA-Z0-9_]*
111
222
---
Invalid definition
Invalid definition
Undefined identifier
Undefined identifier
Undefined identifier
Undefined identifier
---
111
222
Explore 600+ other examples
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      '// (See alternate version of this example using ExpressionTokens instead of ItemOf)
      
      '// In this section underscore, _, and numeric digits
      '// are accepted as part of alphanumeric tokens
      uc.DefineVariable("My_Variable = 111")
      Console.WriteLine(uc.Error.Message)
      uc.DefineVariable("Variable123 = 222")
      Console.WriteLine(uc.Error.Message)
      
      Console.WriteLine(uc.ItemOf("_Token_Alphanumeric").Regex)
      Console.WriteLine(uc.EvalStr("My_Variable"))
      Console.WriteLine(uc.EvalStr("Variable123"))
      Console.WriteLine("---")
      
      '// Now we no longer want underscore, _, or numeric digits
      '// to be accepted in alphanumeric tokens; only A-Z
      uc.ItemOf("_Token_Alphanumeric").Regex = "[a-zA-Z]+"
      
      uc.DefineVariable("Other_Variable = 333")
      Console.WriteLine(uc.Error.Message)
      uc.DefineVariable("OtherVariable123 = 444")
      Console.WriteLine(uc.Error.Message)
      
      Console.WriteLine(uc.EvalStr("Other_Variable"))
      Console.WriteLine(uc.EvalStr("OtherVariable123 "))
      Console.WriteLine(uc.EvalStr("My_Variable"))
      Console.WriteLine(uc.EvalStr("Variable123"))
      Console.WriteLine("---")
      
      '//
      '// We restore the alphanumeric regex to support _ and numbers again
      '// Note: My_Variable and Variable123 remained; they were simply inaccessible
      '// Also: We can't use the commented line below because it has the underscore, _,
      '// character that we had removed.
      '// uc.ItemOf("_token_alphanumeric").Regex("[a-zA-Z_][a-zA-Z0-9_]*");
      uc.ExpressionTokens(TokenType.AlphaNumeric).Regex = "[a-zA-Z_][a-zA-Z0-9_]*"
      Console.WriteLine(uc.EvalStr("My_Variable"))
      Console.WriteLine(uc.EvalStr("Variable123"))
   End Sub
End Module
				
			
No error
No error
[a-zA-Z_][a-zA-Z0-9_]*
111
222
---
Invalid definition
Invalid definition
Undefined identifier
Undefined identifier
Undefined identifier
Undefined identifier
---
111
222
Explore 600+ other examples