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package bjc.rgens.parser.elements;
import bjc.rgens.parser.GrammarException;
public abstract class VariableCaseElement extends CaseElement {
public static enum VariableType {
NORMAL,
EXPAND,
RULE
}
/**
* The name of the variable this element defines.
*/
public final String varName;
/**
* The definition of the variable this element defines.
*/
public final String varDef;
public final VariableType varType;
public VariableCaseElement(String name, String def, VariableType varType) {
super(false);
varName = name;
varDef = def;
this.varType = varType;
}
@Override
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((varDef == null) ? 0 : varDef.hashCode());
result = prime * result + ((varName == null) ? 0 : varName.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!super.equals(obj))
return false;
if (getClass() != obj.getClass())
return false;
VariableCaseElement other = (VariableCaseElement) obj;
if (varDef == null) {
if (other.varDef != null)
return false;
} else if (!varDef.equals(other.varDef))
return false;
if (varName == null) {
if (other.varName != null)
return false;
} else if (!varName.equals(other.varName))
return false;
return true;
}
public static CaseElement parseVariable(String varName, String varDef, boolean colon) {
if(varName.startsWith("$")) {
// Handle normal/expanding variable definitions
if(colon) return new ExpVariableCaseElement(varName.substring(1), varDef);
return new LitVariableCaseElement(varName.substring(1), varDef);
} else if(varName.startsWith("@")) {
return new RuleVariableCaseElement(varName.substring(1), varDef, colon);
} else {
throw new GrammarException("Unrecognized declaration sigil " + varName.charAt(0));
}
}
}
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