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package bjc.rgens.parser.elements;
import bjc.rgens.parser.GenerationState;
import bjc.rgens.parser.GrammarException;
/**
* A element in a rule case.
*
* @author EVE
*/
public abstract class CaseElement {
/**
* The possible types of an element.
*
* @author EVE
*/
public static enum ElementType {
/** An element that represents a literal string. */
LITERAL(true),
/** An element that represents a rule reference. */
RULEREF(true),
/** An element that represents a random range. */
RANGE(true),
/** An element that represents a variable that stores a string. */
VARDEF(false),
/**
* An element that represents a variable that stores the result of generating a
* rule.
*/
EXPVARDEF(false);
public final boolean spacing;
private ElementType(boolean spacing) {
this.spacing = spacing;
}
}
/* Regexps for marking rule types. */
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() {
return String.format("Unknown type '%s'", type);
}
/**
* Generate this case element.
*
* @param state
* The current state of generation.
*/
public abstract void generate(GenerationState state);
/**
* 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("\\{[^}]+\\}")) {
/*
* 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);
}
/*
* @NOTE
*
* This should maybe check that parts[1] is a
* valid rule name, since it gets used as one.
*/
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("\\[[^\\]]+\\]")) {
String rawCase = csepart.substring(1, csepart.length() - 1);
if (rawCase.matches("\\d+\\.\\.\\d+")) {
int firstNum = Integer.parseInt(rawCase.substring(0, rawCase.indexOf('.')));
int secondNum = Integer.parseInt(rawCase.substring(rawCase.lastIndexOf('.') + 1));
return new RangeCaseElement(firstNum, secondNum);
} else if(rawCase.contains("|")) {
String[] elms = rawCase.split("\\|");
System.err.printf("\tTRACE: Split inline cases %s to ", rawCase);
for(String elm : elms) {
System.err.printf("%s, ", elm);
}
System.err.println();
return new InlineRuleCaseElement(elms);
} else if(csepart.contains("$")) {
/*
* @NOTE
*
* Once the rule element execution has been refactored,
* pass rawCase instead.
*/
if(csepart.contains("-")) {
return new DependantRuleReference(csepart);
}
return new VariableRuleReference(csepart);
} else {
return new NormalRuleReference(csepart);
}
} else if(csepart.startsWith("%")) {
String rName = String.format("[%s]", csepart.substring(1));
System.err.printf("\tTRACE: short ref to %s (%s)\n", rName, csepart);
return new NormalRuleReference(rName);
} 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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