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objectos assertion library
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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.testing;

import static com.google.common.collect.Lists.newArrayList;

import java.util.Arrays;
import java.util.List;

import com.google.common.base.Joiner;
import com.google.common.base.Strings;

import org.hamcrest.Description;
import org.hamcrest.SelfDescribing;

/**
 * @author [email protected] (Marcio Endo)
 */
class LineAssert implements SelfDescribing {

  public static final String sep = System.getProperty("line.separator");

  private final List invalidList;

  private LineAssert(List invalidList) {
    this.invalidList = invalidList;
  }

  public static LineAssert get(List actualLines, List expectedLines) {
    List invalidList = newArrayList();

    for (int i = 0; i < expectedLines.size(); i++) {
      String exp = expectedLines.get(i);
      String res = "";

      if (i < actualLines.size()) {
        res = actualLines.get(i);
      }

      Line line = new Line(i, exp, res);
      if (!line.valid()) {
        invalidList.add(line);
      }
    }

    return new LineAssert(invalidList);
  }

  @Override
  public void describeTo(Description description) {
    description.appendText("Found the following error(s):" + sep);

    String text = Joiner.on(sep).join(invalidList);
    description.appendText(text);
  }

  public boolean valid() {
    return invalidList.isEmpty();
  }

  private static class Line {

    private final int index;

    private int errors;

    private final char[] exp;

    private final char[] out;

    private final char[] top;

    private final char[] bot;

    public Line(int index, String res, String ans) {
      this.index = index;

      exp = ans.toCharArray();
      out = Strings.nullToEmpty(res).toCharArray();

      top = new char[exp.length + 1];
      bot = new char[exp.length + 1];
      Arrays.fill(top, ' ');
      Arrays.fill(bot, ' ');

      for (int i = 0; i < exp.length; i++) {
        if (!isEqual(exp, out, i)) {
          errors++;
          top[i] = 'v';
          bot[i] = '^';
        }
      }

      if (out.length > exp.length) {
        errors++;
        top[exp.length] = 'v';
        bot[exp.length] = '^';
      }
    }

    public boolean valid() {
      return errors == 0;
    }

    @Override
    public String toString() {
      return new StringBuilder()
          .append(errors)
          .append(" error(s) at line ")
          .append(index + 1)
          .append(":")
          .append(sep)
          .append(top)
          .append(sep)

          .append(out)
          .append(sep)

          .append(exp)
          .append(sep)

          .append(bot)
          .append(sep)

          .toString();
    }

    private boolean isEqual(char[] exp, char[] out, int i) {
      boolean equal = false;

      if (i < out.length) {
        char expChar = exp[i];
        char outChar = out[i];
        equal = expChar == outChar;
      }

      return equal;
    }

  }

}