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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package parser;
/**
*
* @author edwajohn
*/
public class Action {
enum Act {
SHIFT, REDUCE, ACCEPT
};
private final Act act;
private final Integer state;
private final Rule rule;
static Action createShift(Integer state) {
return new Action(Act.SHIFT, state, null);
}
static Action createReduce(Rule rule) {
return new Action(Act.REDUCE, null, rule);
}
static Action createAccept() {
return new Action(Act.ACCEPT, null, null);
}
private Action(Act act, Integer state, Rule rule) {
this.act = act;
this.state = state;
this.rule = rule;
}
public boolean isShift() {
return act == Act.SHIFT;
}
public boolean isReduce() {
return act == Act.REDUCE;
}
public boolean isAccept() {
return act == Act.ACCEPT;
}
public Integer getState() {
return state;
}
public Rule getRule() {
return rule;
}
@Override
public String toString() {
if (isShift()) {
return "S" + state;
}
if (isReduce()) {
return "R" + rule.getName();
}
return "acc";
}
}
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