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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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 com.google.turbine.parse;
import com.google.turbine.diag.SourceFile;
import java.util.Iterator;
/**
* A {@link Lexer} that wraps an iterator over an existing token stream.
*
* <p>Used when parsing pre-processed constant expression initializers.
*/
public class IteratorLexer implements Lexer {
private final SourceFile source;
private final Iterator<SavedToken> it;
private SavedToken curr;
public IteratorLexer(SourceFile source, Iterator<SavedToken> it) {
this.source = source;
this.it = it;
}
@Override
public SourceFile source() {
return source;
}
@Override
public Token next() {
if (it.hasNext()) {
curr = it.next();
return curr.token;
}
return Token.EOF;
}
@Override
public String stringValue() {
return curr.value;
}
@Override
public int position() {
return curr.position;
}
@Override
public String javadoc() {
return null;
}
}
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