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package bjc.rgens.parser.elements;
import bjc.rgens.parser.GrammarException;
/**
* Variable defining case element.
*
* @author Ben Culkin
*
*/
public abstract class VariableDefCaseElement extends CaseElement {
/**
* The name of the variable this element defines.
*/
public final String varName;
/**
* The definition of the variable this element defines.
*/
public final String varDef;
/**
* Create a variable defining case element.
*
* @param name
* The name of the variable.
* @param def
* The definition of the variable.
*/
public VariableDefCaseElement(String name, String def) {
super(false);
varName = name;
varDef = def;
}
@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;
VariableDefCaseElement other = (VariableDefCaseElement) 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;
}
/**
* Parse a variable reference.
*
* @param varName
* The variable name.
* @param varDef
* The variable definition.
* @param op
* Unused as of yet.
* @param colon
* Whether the colon was present in the declaration.
*
* @return A case element which declares the variable.
*/
public static CaseElement parseVariable(String varName, String varDef, char op,
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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