SubtitleEdit/libse/HtmlUtil.cs
2016-10-31 18:06:00 +01:00

703 lines
31 KiB
C#
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using System;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace Nikse.SubtitleEdit.Core
{
/// <summary>
/// HTML specific string manipulations.
/// </summary>
public static class HtmlUtil
{
public const string TagItalic = "i";
public const string TagBold = "b";
public const string TagUnderline = "u";
public const string TagParagraph = "p";
public const string TagFont = "font";
public const string TagCyrillicI = "\u0456"; // Cyrillic Small Letter Byelorussian-Ukrainian i (http://graphemica.com/%D1%96)
private static readonly Regex TagOpenRegex = new Regex(@"<\s*(?:/\s*)?(\w+)[^>]*>", RegexOptions.Compiled);
/// <summary>
/// Remove all of the specified opening and closing tags from the source HTML string.
/// </summary>
/// <param name="source">The source string to search for specified HTML tags.</param>
/// <param name="tags">The HTML tags to remove.</param>
/// <returns>A new string without the specified opening and closing tags.</returns>
public static string RemoveOpenCloseTags(string source, params string[] tags)
{
// This pattern matches these tag formats:
// <tag*>
// < tag*>
// </tag*>
// < /tag*>
// </ tag*>
// < / tag*>
return TagOpenRegex.Replace(
source,
m => tags.Contains(m.Groups[1].Value, StringComparer.OrdinalIgnoreCase) ? string.Empty : m.Value);
}
/// <summary>
/// Converts a string to an HTML-encoded string using named character references.
/// </summary>
/// <param name="source">The string to encode.</param>
/// <returns>An encoded string.</returns>
public static string EncodeNamed(string source)
{
if (string.IsNullOrEmpty(source))
return string.Empty;
var encoded = new StringBuilder(source.Length);
foreach (var ch in source)
{
switch (ch)
{
case '<':
encoded.Append("&lt;");
break;
case '>':
encoded.Append("&gt;");
break;
case '"':
encoded.Append("&quot;");
break;
case '&':
encoded.Append("&amp;");
break;
case '\'':
encoded.Append("&apos;");
break;
case ' ':
encoded.Append("&nbsp;");
break;
case '':
encoded.Append("&ndash;");
break;
case '—':
encoded.Append("&mdash;");
break;
case '¡':
encoded.Append("&iexcl;");
break;
case '¿':
encoded.Append("&iquest;");
break;
case '“':
encoded.Append("&ldquo;");
break;
case '”':
encoded.Append("&rdquo;");
break;
case '':
encoded.Append("&lsquo;");
break;
case '':
encoded.Append("&rsquo;");
break;
case '«':
encoded.Append("&laquo;");
break;
case '»':
encoded.Append("&raquo;");
break;
case '¢':
encoded.Append("&cent;");
break;
case '©':
encoded.Append("&copy;");
break;
case '÷':
encoded.Append("&divide;");
break;
case 'µ':
encoded.Append("&micro;");
break;
case '·':
encoded.Append("&middot;");
break;
case '¶':
encoded.Append("&para;");
break;
case '±':
encoded.Append("&plusmn;");
break;
case '€':
encoded.Append("&euro;");
break;
case '£':
encoded.Append("&pound;");
break;
case '®':
encoded.Append("&reg;");
break;
case '§':
encoded.Append("&sect;");
break;
case '™':
encoded.Append("&trade;");
break;
case '¥':
encoded.Append("&yen;");
break;
case 'á':
encoded.Append("&aacute;");
break;
case 'Á':
encoded.Append("&Aacute;");
break;
case 'à':
encoded.Append("&agrave;");
break;
case 'À':
encoded.Append("&Agrave;");
break;
case 'â':
encoded.Append("&acirc;");
break;
case 'Â':
encoded.Append("&Acirc;");
break;
case 'å':
encoded.Append("&aring;");
break;
case 'Å':
encoded.Append("&Aring;");
break;
case 'ã':
encoded.Append("&atilde;");
break;
case 'Ã':
encoded.Append("&Atilde;");
break;
case 'ä':
encoded.Append("&auml;");
break;
case 'Ä':
encoded.Append("&Auml;");
break;
case 'æ':
encoded.Append("&aelig;");
break;
case 'Æ':
encoded.Append("&AElig;");
break;
case 'ç':
encoded.Append("&ccedil;");
break;
case 'Ç':
encoded.Append("&Ccedil;");
break;
case 'é':
encoded.Append("&eacute;");
break;
case 'É':
encoded.Append("&Eacute;");
break;
case 'è':
encoded.Append("&egrave;");
break;
case 'È':
encoded.Append("&Egrave;");
break;
case 'ê':
encoded.Append("&ecirc;");
break;
case 'Ê':
encoded.Append("&Ecirc;");
break;
case 'ë':
encoded.Append("&euml;");
break;
case 'Ë':
encoded.Append("&Euml;");
break;
case 'í':
encoded.Append("&iacute;");
break;
case 'Í':
encoded.Append("&Iacute;");
break;
case 'ì':
encoded.Append("&igrave;");
break;
case 'Ì':
encoded.Append("&Igrave;");
break;
case 'î':
encoded.Append("&icirc;");
break;
case 'Î':
encoded.Append("&Icirc;");
break;
case 'ï':
encoded.Append("&iuml;");
break;
case 'Ï':
encoded.Append("&Iuml;");
break;
case 'ñ':
encoded.Append("&ntilde;");
break;
case 'Ñ':
encoded.Append("&Ntilde;");
break;
case 'ó':
encoded.Append("&oacute;");
break;
case 'Ó':
encoded.Append("&Oacute;");
break;
case 'ò':
encoded.Append("&ograve;");
break;
case 'Ò':
encoded.Append("&Ograve;");
break;
case 'ô':
encoded.Append("&ocirc;");
break;
case 'Ô':
encoded.Append("&Ocirc;");
break;
case 'ø':
encoded.Append("&oslash;");
break;
case 'Ø':
encoded.Append("&Oslash;");
break;
case 'õ':
encoded.Append("&otilde;");
break;
case 'Õ':
encoded.Append("&Otilde;");
break;
case 'ö':
encoded.Append("&ouml;");
break;
case 'Ö':
encoded.Append("&Ouml;");
break;
case 'ß':
encoded.Append("&szlig;");
break;
case 'ú':
encoded.Append("&uacute;");
break;
case 'Ú':
encoded.Append("&Uacute;");
break;
case 'ù':
encoded.Append("&ugrave;");
break;
case 'Ù':
encoded.Append("&Ugrave;");
break;
case 'û':
encoded.Append("&ucirc;");
break;
case 'Û':
encoded.Append("&Ucirc;");
break;
case 'ü':
encoded.Append("&uuml;");
break;
case 'Ü':
encoded.Append("&Uuml;");
break;
case 'ÿ':
encoded.Append("&yuml;");
break;
default:
if (ch > 127)
encoded.Append("&#" + (int)ch + ";");
else
encoded.Append(ch);
break;
}
}
return encoded.ToString();
}
/// <summary>
/// Converts a string to an HTML-encoded string using numeric character references.
/// </summary>
/// <param name="source">The string to encode.</param>
/// <returns>An encoded string.</returns>
public static string EncodeNumeric(string source)
{
if (string.IsNullOrEmpty(source))
return string.Empty;
var encoded = new StringBuilder(source.Length);
foreach (var ch in source)
{
if (ch == ' ')
{
encoded.Append("&#");
encoded.Append(160); // &nbsp;
encoded.Append(';');
}
else if (ch > 127 || ch == '<' || ch == '>' || ch == '"' || ch == '&' || ch == '\'')
{
encoded.Append("&#");
encoded.Append((int)ch);
encoded.Append(';');
}
else
{
encoded.Append(ch);
}
}
return encoded.ToString();
}
public static string RemoveHtmlTags(string s, bool alsoSsaTags = false)
{
if (s == null || s.Length < 3)
return s;
if (alsoSsaTags)
s = Utilities.RemoveSsaTags(s);
if (!s.Contains('<'))
return s;
if (s.Contains("< "))
s = FixInvalidItalicTags(s);
return RemoveOpenCloseTags(s, TagItalic, TagBold, TagUnderline, TagParagraph, TagFont, TagCyrillicI);
}
public static bool IsUrl(string text)
{
if (string.IsNullOrWhiteSpace(text) || text.Length < 6 || !text.Contains('.') || text.Contains(' '))
return false;
var allLower = text.ToLower();
if (allLower.StartsWith("http://", StringComparison.Ordinal) || allLower.StartsWith("https://", StringComparison.Ordinal) ||
allLower.StartsWith("www.", StringComparison.Ordinal) || allLower.EndsWith(".org", StringComparison.Ordinal) ||
allLower.EndsWith(".com", StringComparison.Ordinal) || allLower.EndsWith(".net", StringComparison.Ordinal))
return true;
if (allLower.Contains(".org/") || allLower.Contains(".com/") || allLower.Contains(".net/"))
return true;
return false;
}
public static bool StartsWithUrl(string text)
{
if (string.IsNullOrWhiteSpace(text))
return false;
var arr = text.Trim().TrimEnd('.').TrimEnd().Split();
if (arr.Length == 0)
return false;
return IsUrl(arr[0]);
}
private static readonly string[] UppercaseTags = { "<I>", "<U>", "<B>", "<FONT", "</I>", "</U>", "</B>", "</FONT>" };
public static string FixUpperTags(string text)
{
if (string.IsNullOrEmpty(text) || !text.Contains('<'))
return text;
var idx = text.IndexOfAny(UppercaseTags, StringComparison.Ordinal);
while (idx >= 0)
{
var endIdx = text.IndexOf('>', idx + 2);
if (endIdx < idx)
break;
var tag = text.Substring(idx, endIdx - idx).ToLowerInvariant();
text = text.Remove(idx, endIdx - idx).Insert(idx, tag);
idx = text.IndexOfAny(UppercaseTags, StringComparison.Ordinal);
}
return text;
}
public static string FixInvalidItalicTags(string text)
{
const string beginTag = "<i>";
const string endTag = "</i>";
text = text.Replace("< i >", beginTag);
text = text.Replace("< i>", beginTag);
text = text.Replace("<i >", beginTag);
text = text.Replace("<I>", beginTag);
text = text.Replace("< I >", beginTag);
text = text.Replace("< I>", beginTag);
text = text.Replace("<I >", beginTag);
text = text.Replace("< / i >", endTag);
text = text.Replace("< /i>", endTag);
text = text.Replace("</ i>", endTag);
text = text.Replace("< /i >", endTag);
text = text.Replace("</i >", endTag);
text = text.Replace("</ i >", endTag);
text = text.Replace("< / i>", endTag);
text = text.Replace("</I>", endTag);
text = text.Replace("< / I >", endTag);
text = text.Replace("< /I>", endTag);
text = text.Replace("</ I>", endTag);
text = text.Replace("< /I >", endTag);
text = text.Replace("</I >", endTag);
text = text.Replace("</ I >", endTag);
text = text.Replace("< / I>", endTag);
text = text.Replace("</i> <i>", "_@_");
text = text.Replace(" _@_", "_@_");
text = text.Replace(" _@_ ", "_@_");
text = text.Replace("_@_", " ");
if (text.Contains(beginTag))
{
text = text.Replace("<i/>", endTag);
text = text.Replace("<I/>", endTag);
}
else
{
text = text.Replace("<i/>", string.Empty);
text = text.Replace("<I/>", string.Empty);
}
text = text.Replace(beginTag + beginTag, beginTag);
text = text.Replace(endTag + endTag, endTag);
int italicBeginTagCount = Utilities.CountTagInText(text, beginTag);
int italicEndTagCount = Utilities.CountTagInText(text, endTag);
int noOfLines = Utilities.GetNumberOfLines(text);
if (italicBeginTagCount + italicEndTagCount > 0)
{
if (italicBeginTagCount == 1 && italicEndTagCount == 1 && text.IndexOf(beginTag, StringComparison.Ordinal) > text.IndexOf(endTag, StringComparison.Ordinal))
{
const string pattern = "___________@";
text = text.Replace(beginTag, pattern);
text = text.Replace(endTag, beginTag);
text = text.Replace(pattern, endTag);
}
if (italicBeginTagCount == 2 && italicEndTagCount == 0)
{
int firstIndex = text.IndexOf(beginTag, StringComparison.Ordinal);
int lastIndex = text.LastIndexOf(beginTag, StringComparison.Ordinal);
int lastIndexWithNewLine = text.LastIndexOf(Environment.NewLine + beginTag, StringComparison.Ordinal) + Environment.NewLine.Length;
if (noOfLines == 2 && lastIndex == lastIndexWithNewLine && firstIndex < 2)
text = text.Replace(Environment.NewLine, endTag + Environment.NewLine) + endTag;
else
text = text.Remove(lastIndex, beginTag.Length).Insert(lastIndex, endTag);
}
if (italicBeginTagCount == 1 && italicEndTagCount == 2)
{
int firstIndex = text.IndexOf(endTag, StringComparison.Ordinal);
if (text.StartsWith("</i>-<i>-", StringComparison.Ordinal) ||
text.StartsWith("</i>- <i>-", StringComparison.Ordinal) ||
text.StartsWith("</i>- <i> -", StringComparison.Ordinal) ||
text.StartsWith("</i>-<i> -", StringComparison.Ordinal))
text = text.Remove(0, 5);
else if (firstIndex == 0)
text = text.Remove(0, 4);
else
text = text.Substring(0, firstIndex) + text.Substring(firstIndex + endTag.Length);
}
if (italicBeginTagCount == 2 && italicEndTagCount == 1)
{
var lines = text.SplitToLines();
if (lines.Length == 2 && lines[0].StartsWith(beginTag, StringComparison.Ordinal) && lines[0].EndsWith(endTag, StringComparison.Ordinal) &&
lines[1].StartsWith(beginTag, StringComparison.Ordinal))
{
text = text.TrimEnd() + endTag;
}
else
{
int lastIndex = text.LastIndexOf(beginTag, StringComparison.Ordinal);
if (text.Length > lastIndex + endTag.Length)
text = text.Substring(0, lastIndex) + text.Substring(lastIndex - 1 + endTag.Length);
else
text = text.Substring(0, lastIndex - 1) + endTag;
}
if (text.StartsWith(beginTag, StringComparison.Ordinal) && text.EndsWith(endTag, StringComparison.Ordinal) && text.Contains(endTag + Environment.NewLine + beginTag))
{
text = text.Replace(endTag + Environment.NewLine + beginTag, Environment.NewLine);
}
}
if (italicBeginTagCount == 1 && italicEndTagCount == 0)
{
int lastIndexWithNewLine = text.LastIndexOf(Environment.NewLine + beginTag, StringComparison.Ordinal) + Environment.NewLine.Length;
int lastIndex = text.LastIndexOf(beginTag, StringComparison.Ordinal);
if (text.StartsWith(beginTag, StringComparison.Ordinal))
text += endTag;
else if (noOfLines == 2 && lastIndex == lastIndexWithNewLine)
text += endTag;
else
text = text.Replace(beginTag, string.Empty);
}
if (italicBeginTagCount == 0 && italicEndTagCount == 1)
{
var cleanText = RemoveOpenCloseTags(text, TagItalic, TagBold, TagUnderline, TagCyrillicI);
bool isFixed = false;
// Foo.</i>
if (text.EndsWith(endTag, StringComparison.Ordinal) && !cleanText.StartsWith('-') && !cleanText.Contains(Environment.NewLine + "-"))
{
text = beginTag + text;
isFixed = true;
}
// - Foo</i> | - Foo.
// - Bar. | - Foo.</i>
if (!isFixed && Utilities.GetNumberOfLines(cleanText) == 2)
{
int newLineIndex = text.IndexOf(Environment.NewLine, StringComparison.Ordinal);
if (newLineIndex > 0)
{
var firstLine = text.Substring(0, newLineIndex).Trim();
var secondLine = text.Substring(newLineIndex + 2).Trim();
if (firstLine.EndsWith(endTag, StringComparison.Ordinal))
{
firstLine = beginTag + firstLine;
isFixed = true;
}
if (secondLine.EndsWith(endTag, StringComparison.Ordinal))
{
secondLine = beginTag + secondLine;
isFixed = true;
}
text = firstLine + Environment.NewLine + secondLine;
}
}
if (!isFixed)
text = text.Replace(endTag, string.Empty);
}
// - foo.</i>
// - bar.</i>
if (italicBeginTagCount == 0 && italicEndTagCount == 2 && text.Contains(endTag + Environment.NewLine, StringComparison.Ordinal) && text.EndsWith(endTag, StringComparison.Ordinal))
{
text = text.Replace(endTag, string.Empty);
text = beginTag + text + endTag;
}
if (italicBeginTagCount == 0 && italicEndTagCount == 2 && text.StartsWith(endTag, StringComparison.Ordinal) && text.EndsWith(endTag, StringComparison.Ordinal))
{
int firstIndex = text.IndexOf(endTag, StringComparison.Ordinal);
text = text.Remove(firstIndex, endTag.Length).Insert(firstIndex, beginTag);
}
// <i>Foo</i>
// <i>Bar</i>
if (italicBeginTagCount == 2 && italicEndTagCount == 2 && Utilities.GetNumberOfLines(text) == 2)
{
int index = text.IndexOf(Environment.NewLine, StringComparison.Ordinal);
if (index > 0 && text.Length > index + (beginTag.Length + endTag.Length))
{
var firstLine = text.Substring(0, index).Trim();
var secondLine = text.Substring(index + Environment.NewLine.Length).Trim();
if (firstLine.Length > 10 && firstLine.StartsWith("- <i>", StringComparison.Ordinal) && firstLine.EndsWith(endTag, StringComparison.Ordinal))
{
text = "<i>- " + firstLine.Remove(0, 5) + Environment.NewLine + secondLine;
text = text.Replace("<i>- ", "<i>- ");
index = text.IndexOf(Environment.NewLine, StringComparison.Ordinal);
firstLine = text.Substring(0, index).Trim();
secondLine = text.Substring(index + Environment.NewLine.Length).Trim();
}
if (secondLine.Length > 10 && secondLine.StartsWith("- <i>", StringComparison.Ordinal) && secondLine.EndsWith(endTag, StringComparison.Ordinal))
{
text = firstLine + Environment.NewLine + "<i>- " + secondLine.Remove(0, 5);
text = text.Replace("<i>- ", "<i>- ");
index = text.IndexOf(Environment.NewLine, StringComparison.Ordinal);
firstLine = text.Substring(0, index).Trim();
secondLine = text.Substring(index + Environment.NewLine.Length).Trim();
}
if (Utilities.StartsAndEndsWithTag(firstLine, beginTag, endTag) && Utilities.StartsAndEndsWithTag(secondLine, beginTag, endTag))
{
text = text.Replace(beginTag, string.Empty).Replace(endTag, string.Empty).Trim();
text = beginTag + text + endTag;
}
}
//FALCONE:<i> I didn't think</i><br /><i>it was going to be you,</i>
var colIdx = text.IndexOf(':');
if (colIdx >= 0 && Utilities.CountTagInText(text, beginTag) + Utilities.CountTagInText(text, endTag) == 4 && text.Length > colIdx + 1 && !char.IsDigit(text[colIdx + 1]))
{
var firstLine = text.Substring(0, index);
var secondLine = text.Substring(index).TrimStart();
var secIdxCol = secondLine.IndexOf(':');
if (secIdxCol < 0 || !Utilities.IsBetweenNumbers(secondLine, secIdxCol))
{
var idx = firstLine.IndexOf(':');
if (idx > 1)
{
var pre = text.Substring(0, idx + 1).TrimStart();
text = text.Remove(0, idx + 1);
text = FixInvalidItalicTags(text).Trim();
if (text.StartsWith("<i> ", StringComparison.OrdinalIgnoreCase))
text = Utilities.RemoveSpaceBeforeAfterTag(text, beginTag);
text = pre + " " + text;
}
}
}
}
//<i>- You think they're they gone?<i>
//<i>- That can't be.</i>
if ((italicBeginTagCount == 3 && italicEndTagCount == 1) && Utilities.GetNumberOfLines(text) == 2)
{
var newLineIdx = text.IndexOf(Environment.NewLine, StringComparison.Ordinal);
var firstLine = text.Substring(0, newLineIdx).Trim();
var secondLine = text.Substring(newLineIdx).Trim();
if ((Utilities.StartsAndEndsWithTag(firstLine, beginTag, beginTag) && Utilities.StartsAndEndsWithTag(secondLine, beginTag, endTag)) ||
(Utilities.StartsAndEndsWithTag(secondLine, beginTag, beginTag) && Utilities.StartsAndEndsWithTag(firstLine, beginTag, endTag)))
{
text = text.Replace(beginTag, string.Empty);
text = text.Replace(endTag, string.Empty);
text = text.Replace(" ", " ").Trim();
text = beginTag + text + endTag;
}
}
text = text.Replace("<i></i>", string.Empty);
text = text.Replace("<i> </i>", string.Empty);
text = text.Replace("<i> </i>", string.Empty);
}
return text;
}
public static string ToggleTag(string text, string tag)
{
if (text.IndexOf("<" + tag + ">", StringComparison.OrdinalIgnoreCase) >= 0 ||
text.IndexOf("</" + tag + ">", StringComparison.OrdinalIgnoreCase) >= 0)
{
text = text.Replace("<" + tag + ">", string.Empty);
text = text.Replace("</" + tag + ">", string.Empty);
text = text.Replace("<" + tag.ToUpper() + ">", string.Empty);
text = text.Replace("</" + tag.ToUpper() + ">", string.Empty);
}
else
{
int indexOfEndBracket = text.IndexOf('}');
if (text.StartsWith("{\\", StringComparison.Ordinal) && indexOfEndBracket > 1 && indexOfEndBracket < 6)
{
text = $"{text.Substring(0, indexOfEndBracket + 1)}<{tag}>{text.Remove(0, indexOfEndBracket + 1)}</{tag}>";
}
else
{
text = $"<{tag}>{text}</{tag}>";
}
}
return text;
}
}
}