| /* |
| * Copyright 2000-2009 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 com.intellij.lang.pratt; |
| |
| import com.intellij.psi.tree.TokenSet; |
| import com.intellij.psi.tree.IElementType; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * @author peter |
| */ |
| public class PrattParsingUtil { |
| private PrattParsingUtil() { |
| } |
| |
| public static void searchFor(PrattBuilder builder, @NotNull PrattTokenType... types) { |
| searchFor(builder, true, types); |
| } |
| |
| public static boolean searchFor(final PrattBuilder builder, final boolean consume, final PrattTokenType... types) { |
| final TokenSet set = TokenSet.create(types); |
| if (!set.contains(builder.getTokenType())) { |
| builder.assertToken(types[0]); |
| while (!set.contains(builder.getTokenType()) && !builder.isEof()) { |
| builder.advance(); |
| } |
| } |
| if (consume) { |
| builder.advance(); |
| } |
| return !builder.isEof(); |
| } |
| |
| @Nullable |
| public static IElementType parseOption(final PrattBuilder builder, int rightPriority) { |
| final MutableMarker marker = builder.mark(); |
| final IElementType type = builder.createChildBuilder(rightPriority).parse(); |
| if (type == null) { |
| marker.rollback(); |
| } else { |
| marker.finish(); |
| } |
| return type; |
| } |
| } |