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/*
* generated by Xtext 2.21.0
*/
package org.eclipse.viatra.solver.language.parser.antlr;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_FULL_STOP;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_ID;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_INT;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_ML_COMMENT;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_QUOTED_ID;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_REFLEXIVE_TRANSITIVE_CLOSURE;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_SL_COMMENT;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_TRANSITIVE_CLOSURE;
import static org.eclipse.viatra.solver.language.parser.antlr.internal.InternalSolverLanguageParser.RULE_WS;
import java.util.Map;
import org.antlr.runtime.Token;
import org.antlr.runtime.TokenSource;
import org.eclipse.xtext.parser.antlr.ITokenDefProvider;
import org.eclipse.xtext.parser.antlr.TokenAcceptor;
public class SolverLanguageTokenSource implements TokenSource {
private TokenSource delegate;
private final TokenAcceptor acceptor = new TokenAcceptor();
private int lastTokenId = -1;
private int plusTokenId = -1;
private int starTokenId = -1;
private int dotTokenId = -1;
private int tildeTokenId = -1;
private int openParenTokenId = -1;
public SolverLanguageTokenSource(TokenSource delegate) {
this.delegate = delegate;
}
@Override
public String getSourceName() {
return "[SolverLanguageSyntheticTokenTokenSource] " + delegate.getSourceName();
}
@Override
public Token nextToken() {
Token token;
if (acceptor.hasNext()) {
token = acceptor.next();
} else {
token = delegate.nextToken();
}
postProcessToken(token);
lastTokenId = token.getType();
return token;
}
protected void postProcessToken(Token token) {
int type = token.getType();
if (type == plusTokenId) {
if (isTransitiveClosureInReferenceContext()) {
token.setType(RULE_TRANSITIVE_CLOSURE);
}
} else if (type == starTokenId) {
if (isTransitiveClosureInReferenceContext()) {
token.setType(RULE_REFLEXIVE_TRANSITIVE_CLOSURE);
}
} else if (type == dotTokenId) {
if (isFullStopContext()) {
token.setType(RULE_FULL_STOP);
}
}
}
private boolean isIdFragment(int tokenId) {
return tokenId == RULE_ID || tokenId == RULE_QUOTED_ID;
}
private boolean isTransitiveClosureInReferenceContext() {
int nextVisibleTokenId = peekUntilVisible().getType();
return isIdFragment(lastTokenId)
&& (nextVisibleTokenId == dotTokenId || nextVisibleTokenId == openParenTokenId);
}
private boolean isFullStopContext() {
int nextTokenId = peekToken().getType();
boolean inReference = isIdFragment(lastTokenId) && (isIdFragment(nextTokenId) || nextTokenId == tildeTokenId);
boolean inReal = lastTokenId == RULE_INT && nextTokenId == RULE_INT;
return !(inReference || inReal);
}
protected Token peekUntilVisible() {
Token followingToken = null;
do {
followingToken = peekToken();
} while (isHidden(followingToken.getType()));
return followingToken;
}
protected Token peekToken() {
Token followingToken = delegate.nextToken();
acceptor.accept(followingToken);
return followingToken;
}
protected boolean isHidden(int tokenType) {
return tokenType == RULE_WS || tokenType == RULE_SL_COMMENT || tokenType == RULE_ML_COMMENT;
}
public void initializeTokenDefsFrom(ITokenDefProvider provider) {
for (Map.Entry<Integer, String> entry : provider.getTokenDefMap().entrySet()) {
switch (entry.getValue()) {
case "'+'":
plusTokenId = entry.getKey();
break;
case "'*'":
starTokenId = entry.getKey();
break;
case "'.'":
dotTokenId = entry.getKey();
break;
case "'~'":
tildeTokenId = entry.getKey();
break;
case "'('":
openParenTokenId = entry.getKey();
break;
}
}
if (plusTokenId == -1) {
throw new IllegalStateException("Token '+' was not found");
}
if (starTokenId == -1) {
throw new IllegalStateException("Token '*' was not found");
}
if (dotTokenId == -1) {
throw new IllegalStateException("Token '.' was not found");
}
if (tildeTokenId == -1) {
throw new IllegalStateException("Token '~' was not found");
}
if (openParenTokenId == -1) {
throw new IllegalStateException("Token '(' was not found");
}
}
}
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