com.davidbracewell.parsing.handlers.MethodCallHandler Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of mango Show documentation

A set of utilities and tools to speed up and ease programming in Java.

There is a newer version: 0.5

/*
 * (c) 2005 David B. Bracewell
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.davidbracewell.parsing.handlers;

import com.davidbracewell.parsing.ParseException;
import com.davidbracewell.parsing.Parser;
import com.davidbracewell.parsing.ParserToken;
import com.davidbracewell.parsing.ParserTokenType;
import com.davidbracewell.parsing.expressions.Expression;
import com.davidbracewell.parsing.expressions.MethodCallExpression;
import com.google.common.collect.Lists;

import java.util.List;

/**
 * An InfixHandler for method calls.
 *
 * @author David B. Bracewell
 */
public class MethodCallHandler extends InfixHandler {

  private final ParserTokenType methodParamEnd;
  private final ParserTokenType methodArgumentSeparator;

  /**
   * Default constructor
   *
   * @param precedence              The precedence of the handler
   * @param methodParamEnd          The token type indicating the end of the method call
   * @param methodArgumentSeparator The token type for the argument separator
   */
  public MethodCallHandler(int precedence, ParserTokenType methodParamEnd, ParserTokenType methodArgumentSeparator) {
    super(precedence);
    this.methodParamEnd = methodParamEnd;
    this.methodArgumentSeparator = methodArgumentSeparator;
  }

  @Override
  public Expression parse(Parser parser, Expression left, ParserToken token) throws ParseException {
    List args = Lists.newArrayList();
    if (!parser.tokenStream().match(methodParamEnd)) {
      do {
        args.add(parser.next());
      } while (parser.tokenStream().match(methodArgumentSeparator));
      parser.tokenStream().consume(methodParamEnd);
    }
    return new MethodCallExpression(left.toString(), args, token.type);
  }

}