Stepan Koltsov
88 lines
2.1 KiB
Java
88 lines
2.1 KiB
Java
/*
|
|
* Copyright 2010-2012 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.jet.repl;
|
|
|
|
import org.jetbrains.annotations.NotNull;
|
|
import org.jetbrains.annotations.Nullable;
|
|
|
|
import java.util.List;
|
|
import java.util.regex.Matcher;
|
|
import java.util.regex.Pattern;
|
|
|
|
/**
|
|
* @author Stepan Koltsov
|
|
*
|
|
* @see org.jetbrains.jet.lang.types.ref.SimpleParser
|
|
*/
|
|
class SimpleLinesParser {
|
|
|
|
@NotNull
|
|
private final List<String> lines;
|
|
private int position;
|
|
|
|
SimpleLinesParser(@NotNull List<String> lines) {
|
|
this.lines = lines;
|
|
}
|
|
|
|
public boolean lookingAtEof() {
|
|
return position == lines.size();
|
|
}
|
|
|
|
public void checkNotEof() {
|
|
if (lookingAtEof()) {
|
|
throw new IllegalStateException("unexpected EOF");
|
|
}
|
|
}
|
|
|
|
@NotNull
|
|
public String lookahead() {
|
|
checkNotEof();
|
|
return lines.get(position);
|
|
}
|
|
|
|
@Nullable
|
|
public Matcher lookingAt(@NotNull Pattern pattern) {
|
|
if (lookingAtEof()) {
|
|
return null;
|
|
}
|
|
Matcher matcher = pattern.matcher(lookahead());
|
|
if (matcher.matches()) {
|
|
return matcher;
|
|
}
|
|
else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
@NotNull
|
|
public Matcher next(@NotNull Pattern pattern) {
|
|
Matcher r = lookingAt(pattern);
|
|
if (r == null) {
|
|
throw new IllegalStateException("line " + position + " must match " + pattern);
|
|
}
|
|
++position;
|
|
return r;
|
|
}
|
|
|
|
@NotNull
|
|
public String next() {
|
|
String r = lookahead();
|
|
++position;
|
|
return r;
|
|
}
|
|
}
|