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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;

import com.intellij.extapi.psi.ASTWrapperPsiElement;
import com.intellij.lang.ASTNode;
import com.intellij.lang.ParserDefinition;
import com.intellij.lang.PsiParser;
import com.intellij.lexer.Lexer;
import com.intellij.openapi.project.Project;
import com.intellij.psi.FileViewProvider;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.tree.IFileElementType;
import com.intellij.psi.tree.TokenSet;
import com.jetbrains.python.lexer.PythonIndentingLexer;
import com.jetbrains.python.parsing.PyParser;
import com.jetbrains.python.psi.PyElementType;
import com.jetbrains.python.psi.PyFileElementType;
import com.jetbrains.python.psi.PyStubElementType;
import com.jetbrains.python.psi.impl.PyFileImpl;
import org.jetbrains.annotations.NotNull;

/**
 * @author yole
 * @author Keith Lea
 */
public class PythonParserDefinition implements ParserDefinition {
  private final TokenSet myWhitespaceTokens;
  private final TokenSet myCommentTokens;
  private final TokenSet myStringLiteralTokens;

  public PythonParserDefinition() {
    myWhitespaceTokens = TokenSet.create(PyTokenTypes.LINE_BREAK, PyTokenTypes.SPACE, PyTokenTypes.TAB, PyTokenTypes.FORMFEED);
    myCommentTokens = TokenSet.create(PyTokenTypes.END_OF_LINE_COMMENT);
    myStringLiteralTokens = TokenSet.orSet(PyTokenTypes.STRING_NODES, TokenSet.create(PyElementTypes.STRING_LITERAL_EXPRESSION));
  }

  @NotNull
  public Lexer createLexer(Project project) {
    return new PythonIndentingLexer();
  }

  public IFileElementType getFileNodeType() {
    return PyFileElementType.INSTANCE;
  }

  @NotNull
  public TokenSet getWhitespaceTokens() {
    return myWhitespaceTokens;
  }

  @NotNull
  public TokenSet getCommentTokens() {
    return myCommentTokens;
  }

  @NotNull
  public TokenSet getStringLiteralElements() {
    return myStringLiteralTokens;
  }

  @NotNull
  public PsiParser createParser(Project project) {
    return new PyParser();
  }

  @NotNull
  public PsiElement createElement(@NotNull ASTNode node) {
    final IElementType type = node.getElementType();
    if (type instanceof PyElementType) {
      PyElementType pyElType = (PyElementType)type;
      return pyElType.createElement(node);
    }
    else if (type instanceof PyStubElementType) {
      return ((PyStubElementType)type).createElement(node);
    }
    return new ASTWrapperPsiElement(node);
  }

  public PsiFile createFile(FileViewProvider viewProvider) {
    return new PyFileImpl(viewProvider);
  }

  public SpaceRequirements spaceExistanceTypeBetweenTokens(ASTNode left, ASTNode right) {
    // see LanguageTokenSeparatorGenerator instead
    return SpaceRequirements.MAY;
  }

}