IProductionRule

All Known Implementing Classes:

ProductionRule
```
public interface IProductionRule
```
This class represents the interface to define the production rule for any grammar. It provides the way to define a valid token for the parser.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`getName()`	Returns the name of production rule.
`boolean`	`isAllowed(String token)`	Checks whether the token is allowed or not.
`boolean`	`isApproaching(String pattern)`	Checks whether the given token is approachable using any of the pattern or not.

- Method Detail
  - getName
```
String getName()
```
    Returns the name of production rule.
    
    Returns:
    
    the name of production rule
  - isApproaching
```
boolean isApproaching(String pattern)
```
    Checks whether the given token is approachable using any of the pattern or not. Given token can be partially or fully constructed token during parsing process. Parser/DefaultXMLGrammar generally calls this method to check whether the current token can be combined with next character of expression to form some meaningful token or not. If not, then it utilize the existing collected characters as one token, otherwise it keep collecting characters.
    
    Parameters:
    
    token - the token, partially or full constructed, to check whether it can approach to any expression token pattern or not.
    
    Returns:
    
    true if the token pattern is approachable false otherwise.
  - isAllowed
```
boolean isAllowed(String token)
```
    Checks whether the token is allowed or not. A token is fully constructed token. DefaultXMLGrammar/Parser generally calls this method to check whether the current token is a valid token as per the production rules or not.
    
    Parameters:
    
    token - the token which is to be checked for its validity
    
    Returns:
    
    true if the token is allowed false otherwise.