/*
 * Copyright (C) 2009 The Guava Authors
 *
 * 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.google.common.escape;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableMap;
import com.google.common.escape.testing.EscaperAsserts;
import java.io.IOException;
import junit.framework.TestCase;

/**
 * @author David Beaumont
 */
@GwtCompatible
public class ArrayBasedCharEscaperTest extends TestCase {
  private static final ImmutableMap<Character, String> NO_REPLACEMENTS = ImmutableMap.of();
  private static final ImmutableMap<Character, String> SIMPLE_REPLACEMENTS =
      ImmutableMap.of(
          '\n', "<newline>",
          '\t', "<tab>",
          '&', "<and>");

  public void testSafeRange() throws IOException {
    // Basic escaping of unsafe chars (wrap them in {,}'s)
    CharEscaper wrappingEscaper =
        new ArrayBasedCharEscaper(NO_REPLACEMENTS, 'A', 'Z') {
          @Override protected char[] escapeUnsafe(char c) {
            return ("{" + c + "}").toCharArray();
          }
        };
    EscaperAsserts.assertBasic(wrappingEscaper);
    // '[' and '@' lie either side of [A-Z].
    assertEquals("{[}FOO{@}BAR{]}", wrappingEscaper.escape("[FOO@BAR]"));
  }

  public void testSafeRange_maxLessThanMin() throws IOException {
    // Basic escaping of unsafe chars (wrap them in {,}'s)
    CharEscaper wrappingEscaper =
        new ArrayBasedCharEscaper(NO_REPLACEMENTS, 'Z', 'A') {
          @Override protected char[] escapeUnsafe(char c) {
            return ("{" + c + "}").toCharArray();
          }
        };
    EscaperAsserts.assertBasic(wrappingEscaper);
    // escape everything.
    assertEquals("{[}{F}{O}{O}{]}", wrappingEscaper.escape("[FOO]"));
  }

  public void testDeleteUnsafeChars() throws IOException {
    CharEscaper deletingEscaper =
        new ArrayBasedCharEscaper(NO_REPLACEMENTS, ' ', '~') {
          private final char[] noChars = new char[0];
          @Override protected char[] escapeUnsafe(char c) {
            return noChars;
          }
        };
    EscaperAsserts.assertBasic(deletingEscaper);
    assertEquals("Everything outside the printable ASCII range is deleted.",
        deletingEscaper.escape("\tEverything\0 outside the\uD800\uDC00 " +
            "printable ASCII \uFFFFrange is \u007Fdeleted.\n"));
  }

  public void testReplacementPriority() throws IOException {
    CharEscaper replacingEscaper =
        new ArrayBasedCharEscaper(SIMPLE_REPLACEMENTS, ' ', '~') {
          private final char[] unknown = new char[] { '?' };
          @Override protected char[] escapeUnsafe(char c) {
            return unknown;
          }
        };
    EscaperAsserts.assertBasic(replacingEscaper);

    // Replacements are applied first regardless of whether the character is in
    // the safe range or not ('&' is a safe char while '\t' and '\n' are not).
    assertEquals("<tab>Fish <and>? Chips?<newline>",
        replacingEscaper.escape("\tFish &\0 Chips\r\n"));
  }
}