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package bjc.rgens.parser.elements;
import bjc.utils.ioutils.LevelSplitter;
import bjc.rgens.parser.GenerationState;
import bjc.rgens.parser.GrammarException;
import java.util.Arrays;
import static bjc.rgens.parser.RGrammarLogging.*;
/**
* 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. */
VARIABLE(false);
public final boolean spacing;
private ElementType(boolean spacing) {
this.spacing = spacing;
}
}
/** The type of this element. */
public boolean spacing;
protected CaseElement() {
this(true);
}
/**
* Create a new case element.
*
* @param typ
* The type of this element.
*/
protected CaseElement(boolean spacing) {
this.spacing = spacing;
}
/**
* 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("\\(\\S+\\)")) {
return createElement(csepart.substring(1, csepart.length() - 1));
} else if (csepart.matches("\\{\\S+\\}")) {
/*
* Handle special case elements.
*
*/
String specialBody = csepart.substring(1, csepart.length() - 1);
if (specialBody.matches("\\S+:\\S=\\S+")) {
String[] parts = LevelSplitter.def.levelSplit(specialBody, "=").toArray(new String[0]);
if(parts.length != 2) {
throw new GrammarException("Colon variables must have a name and a definition");
}
String varName = parts[0];
char op = varName.charAt(varName.length() - 1);
trace("Colon definition w/ op %d", (int)op);
// Remove the colon, plus any tacked on operator
varName = varName.substring(0, varName.length() - 2);
return VariableDefCaseElement.parseVariable(varName, parts[1], op, true);
} else if (specialBody.matches("\\S+:=\\S+")) {
String[] parts = LevelSplitter.def.levelSplit(specialBody, "=").toArray(new String[0]);
if(parts.length != 2) {
throw new GrammarException("Colon variables must have a name and a definition");
}
String varName = parts[0];
varName = varName.substring(0, varName.length() - 1);
return VariableDefCaseElement.parseVariable(varName, parts[1], ' ', true);
} else if (specialBody.matches("\\S+=\\S+")) {
String[] parts = LevelSplitter.def.levelSplit(specialBody, "=").toArray(new String[0]);
if(parts.length != 2) {
throw new GrammarException("Variables must have a name and a definition");
}
// Non-colon variables can't take an operator
return VariableDefCaseElement.parseVariable(parts[0], parts[1], (char)0, false);
} 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("\\[\\S+\\]")) {
String rawCase = csepart.substring(1, csepart.length() - 1);
if (rawCase.matches("\\d+\\.{2}\\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 = LevelSplitter.def.levelSplit(rawCase, "||").toArray(new String[0]);
return new InlineRuleCaseElement(elms);
} else if(rawCase.contains("|")) {
throw new GrammarException("Inline rule using | found, they use || now");
// String[] elms = LevelSplitter.def.levelSplit(rawCase, "|").toArray(new String[0]);
// return new InlineRuleCaseElement(elms);
} else if (LevelSplitter.def.levelContains(rawCase, ".")) {
String[] parts = LevelSplitter.def.levelSplit(rawCase, ".").toArray(new String[0]);
CaseElement base = createElement(parts[0]);
parts = Arrays.copyOfRange(parts, 1, parts.length);
return new MethodCaseElement(base, parts);
} else {
return new RuleCaseElement(rawCase);
}
} else if(csepart.startsWith("%") && !csepart.equals("%")) {
return new RuleCaseElement(csepart);
} else {
return new LiteralCaseElement(csepart);
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (spacing ? 0 : 2);
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 (spacing != other.spacing)
return false;
return true;
}
}
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