content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * 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.android.exoplayer2.text.webvtt;
  
  import static com.google.android.exoplayer2.testutil.truth.SpannedSubject.assertThat;
  import static com.google.common.truth.Truth.assertThat;
  
  import android.graphics.Color;
  import android.text.Spanned;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import java.util.Collections;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link WebvttCueParser}. */
  @RunWith(AndroidJUnit4.class)
  public final class WebvttCueParserTest {
  
    @Test
    public void parseStrictValidClassesAndTrailingTokens() throws Exception {
      Spanned text =
          parseCueText(
              "<v.first.loud Esme>This <u.style1.style2 some stuff>is</u> text with"
                  + " <b.foo><i.bar>html</i></b> tags");
  
      assertThat(text.toString()).isEqualTo("This is text with html tags");
      assertThat(text).hasUnderlineSpanBetween("This ".length(), "This is".length());
      assertThat(text)
          .hasBoldItalicSpanBetween("This is text with ".length(), "This is text with html".length());
    }
  
    @Test
    public void parseStrictValidUnsupportedTagsStrippedOut() throws Exception {
      Spanned text =
          parseCueText(
              "<v.first.loud Esme>This <unsupported>is</unsupported> text with "
                  + "<notsupp><invalid>html</invalid></notsupp> tags");
  
      assertThat(text.toString()).isEqualTo("This is text with html tags");
      assertThat(text).hasNoSpans();
    }
  
    @Test
    public void parseDefaultTextColor() throws Exception {
      Spanned text = parseCueText("In this sentence <c.red>this text</c> is red");
  
      assertThat(text.toString()).isEqualTo("In this sentence this text is red");
      assertThat(text)
          .hasForegroundColorSpanBetween(
              "In this sentence ".length(), "In this sentence this text".length())
          .withColor(Color.RED);
    }
  
    @Test
    public void parseUnsupportedDefaultTextColor() throws Exception {
      Spanned text = parseCueText("In this sentence <c.papayawhip>this text</c> is not papaya");
  
      assertThat(text.toString()).isEqualTo("In this sentence this text is not papaya");
      assertThat(text).hasNoSpans();
    }
  
    @Test
    public void parseDefaultBackgroundColor() throws Exception {
      Spanned text = parseCueText("In this sentence <c.bg_cyan>this text</c> has a cyan background");
  
      assertThat(text.toString()).isEqualTo("In this sentence this text has a cyan background");
      assertThat(text)
          .hasBackgroundColorSpanBetween(
              "In this sentence ".length(), "In this sentence this text".length())
          .withColor(Color.CYAN);
    }
  
    @Test
    public void parseUnsupportedDefaultBackgroundColor() throws Exception {
      Spanned text =
          parseCueText(
              "In this sentence <c.bg_papayawhip>this text</c> doesn't have a papaya background");
  
      assertThat(text.toString())
          .isEqualTo("In this sentence this text doesn't have a papaya background");
      assertThat(text).hasNoSpans();
    }
  
    @Test
    public void parseWellFormedUnclosedEndAtCueEnd() throws Exception {
      Spanned text =
          parseCueText("An <u some trailing stuff>unclosed u tag with " + "<i>italic</i> inside");
  
      assertThat(text.toString()).isEqualTo("An unclosed u tag with italic inside");
      assertThat(text)
          .hasUnderlineSpanBetween("An ".length(), "An unclosed u tag with italic inside".length());
      assertThat(text)
          .hasItalicSpanBetween(
              "An unclosed u tag with ".length(), "An unclosed u tag with italic".length());
    }
  
    @Test
    public void parseWellFormedUnclosedEndAtParent() throws Exception {
      Spanned text = parseCueText("An italic tag with unclosed <i><u>underline</i> inside");
  
      assertThat(text.toString()).isEqualTo("An italic tag with unclosed underline inside");
      assertThat(text)
          .hasItalicSpanBetween(
              "An italic tag with unclosed ".length(),
              "An italic tag with unclosed underline".length());
      assertThat(text)
          .hasUnderlineSpanBetween(
              "An italic tag with unclosed ".length(),
              "An italic tag with unclosed underline".length());
    }
  
    @Test
    public void parseMalformedNestedElements() throws Exception {
      Spanned text = parseCueText("<b><u>Overlapping u <i>and</u> i tags</i></b>");
  
      String expectedText = "Overlapping u and i tags";
      assertThat(text.toString()).isEqualTo(expectedText);
      assertThat(text).hasBoldSpanBetween(0, expectedText.length());
      // Text between the <u> tags is underlined.
      assertThat(text).hasUnderlineSpanBetween(0, "Overlapping u and".length());
      // Only text from <i> to <\\u> is italic (unexpected - but simplifies the parsing).
      assertThat(text).hasItalicSpanBetween("Overlapping u ".length(), "Overlapping u and".length());
    }
  
    @Test
    public void parseCloseNonExistingTag() throws Exception {
      Spanned text = parseCueText("foo<b>bar</i>baz</b>buzz");
      assertThat(text.toString()).isEqualTo("foobarbazbuzz");
  
      // endIndex should be 9 when valid (i.e. "foobarbaz".length()
      assertThat(text).hasBoldSpanBetween("foo".length(), "foobar".length());
    }
  
    @Test
    public void parseEmptyTagName() throws Exception {
      Spanned text = parseCueText("An empty <>tag");
      assertThat(text.toString()).isEqualTo("An empty tag");
    }
  
    @Test
    public void parseEntities() throws Exception {
      Spanned text = parseCueText("&amp; &gt; &lt; &nbsp;");
      assertThat(text.toString()).isEqualTo("& > <  ");
    }
  
    @Test
    public void parseEntitiesUnsupported() throws Exception {
      Spanned text = parseCueText("&noway; &sure;");
      assertThat(text.toString()).isEqualTo(" ");
    }
  
    @Test
    public void parseEntitiesNotTerminated() throws Exception {
      Spanned text = parseCueText("&amp here comes text");
      assertThat(text.toString()).isEqualTo("& here comes text");
    }
  
    @Test
    public void parseEntitiesNotTerminatedUnsupported() throws Exception {
      Spanned text = parseCueText("&surenot here comes text");
      assertThat(text.toString()).isEqualTo(" here comes text");
    }
  
    @Test
    public void parseEntitiesNotTerminatedNoSpace() throws Exception {
      Spanned text = parseCueText("&surenot");
      assertThat(text.toString()).isEqualTo("&surenot");
    }
  
    @Test
    public void parseVoidTag() throws Exception {
      Spanned text = parseCueText("here comes<br/> text<br/>");
      assertThat(text.toString()).isEqualTo("here comes text");
    }
  
    @Test
    public void parseMultipleTagsOfSameKind() {
      Spanned text = parseCueText("blah <b>blah</b> blah <b>foo</b>");
  
      assertThat(text.toString()).isEqualTo("blah blah blah foo");
      assertThat(text).hasBoldSpanBetween("blah ".length(), "blah blah".length());
      assertThat(text).hasBoldSpanBetween("blah blah blah ".length(), "blah blah blah foo".length());
    }
  
    @Test
    public void parseInvalidVoidSlash() {
      Spanned text = parseCueText("blah <b/.st1.st2 trailing stuff> blah");
  
      assertThat(text.toString()).isEqualTo("blah  blah");
      assertThat(text).hasNoSpans();
    }
  
    @Test
    public void parseMonkey() throws Exception {
      Spanned text =
          parseCueText(
              "< u>An unclosed u tag with <<<<< i>italic</u></u></u></u    >" + "</i><u><u> inside");
      assertThat(text.toString()).isEqualTo("An unclosed u tag with italic inside");
      text =
          parseCueText(
              ">>>>>>>>>An unclosed u tag with <<<<< italic</u></u></u>" + "</u  ></i><u><u> inside");
      assertThat(text.toString()).isEqualTo(">>>>>>>>>An unclosed u tag with  inside");
    }
  
    @Test
    public void parseCornerCases() throws Exception {
      Spanned text = parseCueText(">");
      assertThat(text.toString()).isEqualTo(">");
  
      text = parseCueText("<");
      assertThat(text.toString()).isEmpty();
  
      text = parseCueText("<b.st1.st2 annotation");
      assertThat(text.toString()).isEmpty();
  
      text = parseCueText("<<<<<<<<<<<<<<<<");
      assertThat(text.toString()).isEmpty();
  
      text = parseCueText("<<<<<<>><<<<<<<<<<");
      assertThat(text.toString()).isEqualTo(">");
  
      text = parseCueText("<>");
      assertThat(text.toString()).isEmpty();
  
      text = parseCueText("&");
      assertThat(text.toString()).isEqualTo("&");
  
      text = parseCueText("&&&&&&&");
      assertThat(text.toString()).isEqualTo("&&&&&&&");
    }
  
    private static Spanned parseCueText(String string) {
      return WebvttCueParser.parseCueText(
          /* id= */ null, string, /* styles= */ Collections.emptyList());
    }
  }
  