org.jetbrains.kotlin.parsing.TruncatedSemanticWhitespaceAwarePsiBuilder Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.parsing;
import com.intellij.psi.tree.IElementType;
public class TruncatedSemanticWhitespaceAwarePsiBuilder extends SemanticWhitespaceAwarePsiBuilderAdapter {
private final int myEOFPosition;
public TruncatedSemanticWhitespaceAwarePsiBuilder(SemanticWhitespaceAwarePsiBuilder builder, int eofPosition) {
super(builder);
this.myEOFPosition = eofPosition;
}
@Override
public boolean eof() {
return super.eof() || isOffsetBeyondEof(getCurrentOffset());
}
@Override
public String getTokenText() {
if (eof()) return null;
return super.getTokenText();
}
@Override
public IElementType getTokenType() {
if (eof()) return null;
return super.getTokenType();
}
@Override
public IElementType lookAhead(int steps) {
if (eof()) return null;
int rawLookAheadSteps = rawLookAhead(steps);
if (isOffsetBeyondEof(rawTokenTypeStart(rawLookAheadSteps))) return null;
return super.rawLookup(rawLookAheadSteps);
}
private int rawLookAhead(int steps) {
// This code reproduces the behavior of PsiBuilderImpl.lookAhead(), but returns a number of raw steps instead of a token type
// This is required for implementing truncated builder behavior
int cur = 0;
while (steps > 0) {
cur++;
IElementType rawTokenType = rawLookup(cur);
while (rawTokenType != null && isWhitespaceOrComment(rawTokenType)) {
cur++;
rawTokenType = rawLookup(cur);
}
steps--;
}
return cur;
}
private boolean isOffsetBeyondEof(int offsetFromCurrent) {
return myEOFPosition >= 0 && offsetFromCurrent >= myEOFPosition;
}
}