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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 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.jetbrains.python.parsing;

import com.intellij.lang.PsiBuilder;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.tree.IElementType;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.PyElementTypes;
import com.jetbrains.python.PyTokenTypes;
import com.jetbrains.python.psi.PyElementType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author yole
 */
public class Parsing {
  protected ParsingContext myContext;
  protected PsiBuilder myBuilder;
  private static final Logger LOG = Logger.getInstance("#com.jetbrains.python.parsing.Parsing");

  protected Parsing(ParsingContext context) {
    myContext = context;
    myBuilder = context.getBuilder();
  }

  public ParsingContext getParsingContext() {
    return myContext;
  }

  public ExpressionParsing getExpressionParser() {
    return getParsingContext().getExpressionParser();
  }

  public StatementParsing getStatementParser() {
    return getParsingContext().getStatementParser();
  }

  public FunctionParsing getFunctionParser() {
    return getParsingContext().getFunctionParser();
  }

  protected boolean checkMatches(final IElementType token, final String message) {
    if (myBuilder.getTokenType() == token) {
      myBuilder.advanceLexer();
      return true;
    }
    myBuilder.error(message);
    return false;
  }

  protected boolean parseIdentifierOrSkip(@NotNull IElementType... validSuccessiveTokens) {
    if (myBuilder.getTokenType() == PyTokenTypes.IDENTIFIER) {
      myBuilder.advanceLexer();
      return true;
    }
    else {
      final PsiBuilder.Marker nameExpected = myBuilder.mark();
      if (myBuilder.getTokenType() != PyTokenTypes.STATEMENT_BREAK && !atAnyOfTokens(validSuccessiveTokens)) {
        myBuilder.advanceLexer();
      }
      nameExpected.error(PyBundle.message("PARSE.expected.identifier"));
      return false;
    }
  }

  protected void assertCurrentToken(final PyElementType tokenType) {
    LOG.assertTrue(myBuilder.getTokenType() == tokenType);
  }

  protected boolean atToken(@Nullable final IElementType tokenType) {
    return myBuilder.getTokenType() == tokenType;
  }

  protected boolean atToken(@NotNull final IElementType tokenType, @NotNull String tokenText) {
    return myBuilder.getTokenType() == tokenType && tokenText.equals(myBuilder.getTokenText());
  }

  protected boolean atAnyOfTokens(final IElementType... tokenTypes) {
    IElementType currentTokenType = myBuilder.getTokenType();
    for (IElementType tokenType : tokenTypes) {
      if (currentTokenType == tokenType) return true;
    }
    return false;
  }

  protected boolean matchToken(final IElementType tokenType) {
    if (myBuilder.getTokenType() == tokenType) {
      myBuilder.advanceLexer();
      return true;
    }
    return false;
  }

  protected void nextToken() {
    myBuilder.advanceLexer();
  }

  protected static void buildTokenElement(IElementType type, PsiBuilder builder) {
    final PsiBuilder.Marker marker = builder.mark();
    builder.advanceLexer();
    marker.done(type);
  }

  protected IElementType getReferenceType() {
    return PyElementTypes.REFERENCE_EXPRESSION;
  }
}