python/src/com/jetbrains/python/console/parsing/PyConsoleParser.java

/*
 * Copyright 2000-2013 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.console.parsing;

import com.intellij.lang.ASTNode;
import com.intellij.lang.PsiBuilder;
import com.intellij.psi.tree.IElementType;
import com.jetbrains.python.PyTokenTypes;
import com.jetbrains.python.parsing.ParsingContext;
import com.jetbrains.python.parsing.PyParser;
import com.jetbrains.python.parsing.StatementParsing;
import com.jetbrains.python.psi.LanguageLevel;
import org.jetbrains.annotations.NotNull;

/**
 * @author traff
 */
public class PyConsoleParser extends PyParser{
  private LanguageLevel myLanguageLevel;
  private StatementParsing.FUTURE myFutureFlag;
  private PythonConsoleData myPythonConsoleData;
  private boolean myIPythonStartSymbol;

  public PyConsoleParser(PythonConsoleData pythonConsoleData) {
    myPythonConsoleData = pythonConsoleData;
    myLanguageLevel = LanguageLevel.getDefault();
  }

  public void setLanguageLevel(LanguageLevel languageLevel) {
    myLanguageLevel = languageLevel;
  }

  @NotNull
  @Override
  public ASTNode parse(IElementType root, PsiBuilder builder) {
    final PsiBuilder.Marker rootMarker = builder.mark();

    myIPythonStartSymbol = myPythonConsoleData.isIPythonEnabled() && startsWithIPythonSpecialSymbol(builder);

    ParsingContext context = createParsingContext(builder, myLanguageLevel, myFutureFlag);

    StatementParsing stmt_parser = context.getStatementParser();
    builder.setTokenTypeRemapper(stmt_parser); // must be done before touching the caching lexer with eof() call.

    while (!builder.eof()) {
      stmt_parser.parseStatement(context.emptyParsingScope());
    }
    rootMarker.done(root);
    return builder.getTreeBuilt();
  }

  private static boolean startsWithIPythonSpecialSymbol(PsiBuilder builder) {
    IElementType tokenType = builder.getTokenType();
    return builder.getTokenType() == PyConsoleTokenTypes.QUESTION_MARK || tokenType == PyTokenTypes.PERC || tokenType == PyTokenTypes.COMMA || tokenType == PyTokenTypes.SEMICOLON ||
      "/".equals(builder.getTokenText());
  }


  @Override
  protected ParsingContext createParsingContext(PsiBuilder builder, LanguageLevel languageLevel, StatementParsing.FUTURE futureFlag) {
    return new PyConsoleParsingContext(builder, languageLevel, futureFlag, myPythonConsoleData, myIPythonStartSymbol);
  }
}