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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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 org.mvel2.util;

import org.mvel2.CompileException;
import org.mvel2.DataConversion;
import org.mvel2.ParserContext;
import org.mvel2.compiler.ExecutableStatement;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.mvel2.util.ParseTools.*;
import static org.mvel2.util.ReflectionUtil.isAssignableFrom;

/**
 * This is the inline collection sub-parser.  It produces a skeleton model of the collection which is in turn translated
 * into a sequenced AST to produce the collection efficiently at runtime, and passed off to one of the JIT's if
 * configured.
 *
 * @author Christopher Brock
 */
public class CollectionParser {
  private char[] property;

  private int cursor;
  private int start;
  private int end;

  private int type;

  public static final int LIST = 0;
  public static final int ARRAY = 1;
  public static final int MAP = 2;

  private Class colType;
  private ParserContext pCtx;

  private static final Object[] EMPTY_ARRAY = new Object[0];

  public CollectionParser() {
  }

  public CollectionParser(int type) {
    this.type = type;
  }

  public Object parseCollection(char[] property, int start, int offset, boolean subcompile, ParserContext pCtx) {
    this.property = property;
    this.pCtx = pCtx;
    this.end = start + offset;

    while (start < end && isWhitespace(property[start])) {
      start++;
    }
    this.start = this.cursor = start;

    return parseCollection(subcompile);
  }

  public Object parseCollection(char[] property, int start, int offset, boolean subcompile, Class colType, ParserContext pCtx) {
    if (colType != null) this.colType = getBaseComponentType(colType);
    this.property = property;

    this.end = start + offset;

    while (start < end && isWhitespace(property[start])) {
      start++;
    }

    this.start = this.cursor = start;

    this.pCtx = pCtx;

    return parseCollection(subcompile);
  }

  private Object parseCollection(boolean subcompile) {
    if (end - start == 0) {
      if (type == LIST) return new ArrayList();
      else return EMPTY_ARRAY;
    }

    Map map = null;
    List