me.jaimegarza.syntax.model.parser

Class RuleItem

java.lang.Object

me.jaimegarza.syntax.model.parser.RuleItem

public class RuleItem
extends Object

~pojo class

During the parsing process, the grammar is represented as a list of Rules. Each rule is composed of a list of zero or many RuleItems. This representation is used throughout the multiple processes to generate the structure of the syntax including computing first, follow, lookaheads, states, actions, grammar tables, and finally parsing tables. This class defines a whole rule.

Author:

jaimegarza@gmail.com

Constructor Summary

Constructors

Constructor and Description
RuleItem(Symbol symbol) Construct a rule item with the given symbol

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
static boolean	equals(RuleItem a, RuleItem b) Utility method to compare two items, accounting for nulls
Rule	getRule()
Symbol	getSymbol()
int	getSymbolId() Convenience method to get the id of the symbol in the rule item
RuleItem	next() Move to the next item in the rule
void	setRule(Rule rule)
void	setSymbol(Symbol symbol)
String	toString() Returns the symbol string value.

Methods inherited from class java.lang.Object

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

Constructor Detail

RuleItem

public RuleItem(Symbol symbol)

Construct a rule item with the given symbol

Parameters:

symbol - is the symbol for the rule item

Method Detail

getSymbolId

public int getSymbolId()

Convenience method to get the id of the symbol in the rule item

Returns:

the id of the symbol

next

public RuleItem next()

Move to the next item in the rule

Returns:

the next item, or null if at the end

getSymbol

public Symbol getSymbol()

Returns:

the symbol

setSymbol

public void setSymbol(Symbol symbol)

Parameters:

symbol - the symbol to set

getRule

public Rule getRule()

Returns:

the rule

setRule

public void setRule(Rule rule)

Parameters:

rule - the rule to set

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

equals

public static boolean equals(RuleItem a,
                             RuleItem b)

Utility method to compare two items, accounting for nulls

Parameters:

a - the first element. Can be null.

b - the second element. Can be null.

Returns:

true if both are null, otherwise the result of a.equals(b)

toString

public String toString()

Returns the symbol string value.

Overrides:

toString in class Object

See Also:

Object.toString()