Class Grammar

java.lang.Object
  Grammar

public class Grammar
extends java.lang.Object

Constructor Summary

Grammar()
Constructs a new, empty grammar.

Method Summary

void	addRule(java.lang.String ruleText) Adds definitions for a single nonterminal to this grammar.
Definitions	getDefinitions(java.lang.String nonterminal) Returns a list of definitions for the given nonterminal.
void	print() Prints this Grammar.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Grammar

public Grammar()

Constructs a new, empty grammar.

Method Detail

addRule

public void addRule(java.lang.String ruleText)
             throws java.lang.IllegalArgumentException

Adds definitions for a single nonterminal to this grammar. The input text should be in the form:

• A single nonterminal (the thing being defined),
• The symbol "::=", and
• A list of zero or more definitions, separated by the "|" symbol.

Parameters:

ruleText - The text to be parsed and kept as definitions.

Throws:

java.lang.IllegalArgumentException - If the input parameter has a syntax error.

getDefinitions

public Definitions getDefinitions(java.lang.String nonterminal)

Returns a list of definitions for the given nonterminal.

Parameters:

nonterminal - The nonterminal whose definitions are to be returned.

Returns:

The definitions of the given nonterminal.

print

public void print()

Prints this Grammar.