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package bjc.rgens.parser.elements;
import bjc.rgens.parser.GrammarException;
/*
* @TODO 10/11/17 Ben Culkin :CaseElementSplit Split this into multiple
* subclasses based off of a value of ElementType.
*/
/**
* A element in a rule case.
*
* @author EVE
*/
public class CaseElement {
/**
* The possible types of an element.
*
* @author EVE
*/
public static enum ElementType {
/** An element that represents a literal string. */
LITERAL,
/** An element that represents a rule reference. */
RULEREF,
/** An element that represents a random range. */
RANGE,
/** An element that represents a variable that stores a string. */
VARDEF,
/**
* An element that represents a variable that stores the result of generating a
* rule.
*/
EXPVARDEF;
}
/* Regexps for marking rule types. */
private static final String SPECIAL_CASELEM = "\\{[^}]+\\}";
private static final String REFER_CASELEM = "\\[[^\\]]+\\]";
private static final String RANGE_CASELM = "\\[\\d+\\.\\.\\d+\\]";
/** The type of this element. */
public final ElementType type;
/**
* Create a new case element.
*
* @param typ
* The type of this element.
*/
protected CaseElement(ElementType typ) {
type = typ;
}
@Override
public String toString() {
switch (type) {
default:
return String.format("Unknown type '%s'", type);
}
}
/**
* Create a case element from a string.
*
* @param csepart
* The string to convert.
*
* @return A case element representing the string.
*/
public static CaseElement createElement(String csepart) {
if (csepart == null) {
throw new NullPointerException("Case part cannot be null");
}
if (csepart.matches(SPECIAL_CASELEM)) {
/* Handle special cases. */
String specialBody = csepart.substring(1, csepart.length() - 1);
System.out.printf("\t\tTRACE: special body is '%s'\n", specialBody);
if (specialBody.matches("\\S+:=\\S+")) {
/* Handle expanding variable definitions. */
String[] parts = specialBody.split(":=");
if (parts.length != 2) {
String msg = "Expanded variables must be a name and a definition, seperated by :=";
throw new GrammarException(msg);
}
return new ExpVariableCaseElement(parts[0], parts[1]);
} else if (specialBody.matches("\\S+=\\S+")) {
/* Handle regular variable definitions. */
String[] parts = specialBody.split("=");
if (parts.length != 2) {
String msg = "Variables must be a name and a definition, seperated by =";
throw new GrammarException(msg);
}
return new LitVariableCaseElement(parts[0], parts[1]);
} else if (specialBody.matches("{empty}")) {
/* Literal blank, for empty cases. */
return new BlankCaseElement();
} else {
throw new IllegalArgumentException(String.format("Unknown special case part '%s'", specialBody));
}
} else if (csepart.matches(REFER_CASELEM)) {
if (csepart.matches(RANGE_CASELM)) {
/* Handle ranges */
String rawRange = csepart.substring(1, csepart.length() - 1);
int firstNum = Integer.parseInt(rawRange.substring(0, rawRange.indexOf('.')));
int secondNum = Integer.parseInt(rawRange.substring(rawRange.lastIndexOf('.') + 1));
return new RangeCaseElement(firstNum, secondNum);
}
return new RuleCaseElement(csepart);
} else {
return new LiteralCaseElement(csepart);
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((type == null) ? 0 : type.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
CaseElement other = (CaseElement) obj;
if (type != other.type)
return false;
return true;
}
}
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