mirror of
https://github.com/SubtitleEdit/subtitleedit.git
synced 2024-11-23 19:52:48 +01:00
367 lines
14 KiB
C#
367 lines
14 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Text;
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namespace Nikse.SubtitleEdit.Core
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{
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public static class StringExtensions
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{
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public static bool LineStartsWithHtmlTag(this string text, bool threeLengthTag, bool includeFont = false)
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{
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if (text == null || (!threeLengthTag && !includeFont))
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return false;
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return StartsWithHtmlTag(text, threeLengthTag, includeFont);
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}
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public static bool LineEndsWithHtmlTag(this string text, bool threeLengthTag, bool includeFont = false)
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{
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if (text == null)
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return false;
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var len = text.Length;
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if (len < 6 || text[len - 1] != '>')
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return false;
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// </font> </i>
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if (threeLengthTag && len > 3 && text[len - 4] == '<' && text[len - 3] == '/')
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return true;
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if (includeFont && len > 8 && text[len - 7] == '<' && text[len - 6] == '/')
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return true;
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return false;
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}
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public static bool LineBreakStartsWithHtmlTag(this string text, bool threeLengthTag, bool includeFont = false)
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{
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if (text == null || (!threeLengthTag && !includeFont))
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return false;
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var newLineIdx = text.IndexOf(Environment.NewLine, StringComparison.Ordinal);
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if (newLineIdx < 0 || text.Length < newLineIdx + 5)
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return false;
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text = text.Substring(newLineIdx + 2);
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return StartsWithHtmlTag(text, threeLengthTag, includeFont);
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}
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private static bool StartsWithHtmlTag(string text, bool threeLengthTag, bool includeFont)
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{
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if (threeLengthTag && text.Length >= 3 && text[0] == '<' && text[2] == '>' && (text[1] == 'i' || text[1] == 'I' || text[1] == 'u' || text[1] == 'U' || text[1] == 'b' || text[1] == 'B'))
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return true;
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if (includeFont && text.Length > 5 && text.StartsWith("<font", StringComparison.OrdinalIgnoreCase))
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return text.IndexOf('>', 5) >= 5; // <font> or <font color="#000000">
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return false;
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}
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public static bool StartsWith(this string s, char c)
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{
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return s.Length > 0 && s[0] == c;
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}
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public static bool StartsWith(this StringBuilder sb, char c)
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{
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return sb.Length > 0 && sb[0] == c;
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}
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public static bool EndsWith(this string s, char c)
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{
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return s.Length > 0 && s[s.Length - 1] == c;
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}
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public static bool EndsWith(this StringBuilder sb, char c)
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{
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return sb.Length > 0 && sb[sb.Length - 1] == c;
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}
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public static bool Contains(this string source, char value)
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{
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return source.IndexOf(value) >= 0;
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}
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public static bool Contains(this string source, char[] value)
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{
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return source.IndexOfAny(value) >= 0;
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}
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public static bool Contains(this string source, string value, StringComparison comparisonType)
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{
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return source.IndexOf(value, comparisonType) >= 0;
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}
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public static List<string> SplitToLines(this string s)
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{
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//original non-optimized version: return source.Replace("\r\r\n", "\n").Replace("\r\n", "\n").Replace('\r', '\n').Replace('\u2028', '\n').Split('\n');
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var lines = new List<string>();
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int start = 0;
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int max = s.Length;
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int i = 0;
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while (i < max)
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{
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var ch = s[i];
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if (ch == '\r')
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{
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if (i < s.Length - 2 && s[i + 1] == '\r' && s[i + 2] == '\n') // \r\r\n
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{
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lines.Add(start < i ? s.Substring(start, i - start) : string.Empty);
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i += 3;
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start = i;
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continue;
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}
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if (i < s.Length - 1 && s[i + 1] == '\n') // \r\n
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{
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lines.Add(start < i ? s.Substring(start, i - start) : string.Empty);
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i += 2;
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start = i;
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continue;
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}
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lines.Add(start < i ? s.Substring(start, i - start) : string.Empty);
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i++;
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start = i;
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continue;
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}
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if (ch == '\n' || ch == '\u2028')
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{
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lines.Add(start < i ? s.Substring(start, i - start) : string.Empty);
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i++;
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start = i;
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continue;
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}
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i++;
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}
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lines.Add(start < i ? s.Substring(start, i - start) : string.Empty);
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return lines;
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}
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public static int CountWords(this string source)
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{
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return HtmlUtil.RemoveHtmlTags(source, true).Split(new[] { ' ', '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries).Length;
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}
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// http://www.codeproject.com/Articles/43726/Optimizing-string-operations-in-C
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public static int FastIndexOf(this string source, string pattern)
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{
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if (pattern == null) throw new ArgumentNullException();
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if (pattern.Length == 0) return 0;
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if (pattern.Length == 1) return source.IndexOf(pattern[0]);
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int limit = source.Length - pattern.Length + 1;
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if (limit < 1) return -1;
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// Store the first 2 characters of "pattern"
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char c0 = pattern[0];
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char c1 = pattern[1];
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// Find the first occurrence of the first character
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int first = source.IndexOf(c0, 0, limit);
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while (first != -1)
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{
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// Check if the following character is the same like
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// the 2nd character of "pattern"
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if (source[first + 1] != c1)
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{
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first = source.IndexOf(c0, ++first, limit - first);
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continue;
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}
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// Check the rest of "pattern" (starting with the 3rd character)
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bool found = true;
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for (var j = 2; j < pattern.Length; j++)
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if (source[first + j] != pattern[j])
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{
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found = false;
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break;
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}
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// If the whole word was found, return its index, otherwise try again
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if (found) return first;
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first = source.IndexOf(c0, ++first, limit - first);
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}
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return -1;
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}
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public static int IndexOfAny(this string s, string[] words, StringComparison comparisonType)
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{
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if (words == null || string.IsNullOrEmpty(s))
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return -1;
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for (int i = 0; i < words.Length; i++)
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{
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var idx = s.IndexOf(words[i], comparisonType);
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if (idx >= 0)
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return idx;
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}
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return -1;
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}
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public static string FixExtraSpaces(this string s)
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{
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if (string.IsNullOrEmpty(s)) return s;
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const char whiteSpace = ' ';
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int k = -1;
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for (int i = s.Length - 1; i >= 0; i--)
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{
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char ch = s[i];
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if (k < 2)
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{
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if (ch == whiteSpace)
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{
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k = i + 1;
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}
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}
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else if (ch != whiteSpace)
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{
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// only keep white space if it doesn't succeed/precede CRLF
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int skipCount = (ch == '\n' || ch == '\r') || (k < s.Length && (s[k] == '\n' || s[k] == '\r')) ? 1 : 2;
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// extra space found
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if (k - (i + skipCount) >= 1)
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{
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s = s.Remove(i + 1, k - (i + skipCount));
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}
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// Reset remove length.
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k = -1;
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}
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}
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return s;
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}
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public static bool ContainsLetter(this string s)
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{
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if (s != null)
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{
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foreach (var index in StringInfo.ParseCombiningCharacters(s))
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{
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var uc = CharUnicodeInfo.GetUnicodeCategory(s, index);
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if (uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter)
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return true;
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}
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}
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return false;
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}
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public static string RemoveControlCharacters(this string s)
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{
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int max = s.Length;
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var newStr = new char[max];
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int newIdx = 0;
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for (int index = 0; index < max; index++)
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{
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var ch = s[index];
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if (!char.IsControl(ch))
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{
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newStr[newIdx++] = ch;
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}
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}
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return new string(newStr, 0, newIdx);
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}
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public static string RemoveControlCharactersButWhiteSpace(this string s)
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{
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int max = s.Length;
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var newStr = new char[max];
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int newIdx = 0;
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for (int index = 0; index < max; index++)
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{
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var ch = s[index];
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if (!char.IsControl(ch) || ch == '\u000d' || ch == '\u000a' || ch == '\u0009')
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{
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newStr[newIdx++] = ch;
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}
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}
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return new string(newStr, 0, newIdx);
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}
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public static string CapitalizeFirstLetter(this string s, CultureInfo ci = null)
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{
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var si = new StringInfo(s);
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if (ci == null)
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ci = CultureInfo.CurrentCulture;
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if (si.LengthInTextElements > 0)
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s = si.SubstringByTextElements(0, 1).ToUpper(ci);
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if (si.LengthInTextElements > 1)
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s += si.SubstringByTextElements(1);
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return s;
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}
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public static string ToRtf(this string value)
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{
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return @"{\rtf1\ansi\ansicpg1252\deff0{\fonttbl\f0\fswiss Helvetica;}\f0\pard " + value.ToRtfPart() + @"\par" + Environment.NewLine + "}";
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}
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public static string ToRtfPart(this string value)
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{
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// special RTF chars
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var backslashed = new StringBuilder(value);
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backslashed.Replace(@"\", @"\\");
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backslashed.Replace(@"{", @"\{");
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backslashed.Replace(@"}", @"\}");
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backslashed.Replace(Environment.NewLine, @"\par" + Environment.NewLine);
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// convert string char by char
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var sb = new StringBuilder();
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foreach (char character in backslashed.ToString())
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{
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if (character <= 0x7f)
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sb.Append(character);
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else
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sb.Append("\\u" + Convert.ToUInt32(character) + "?");
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}
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return sb.ToString();
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}
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public static string FromRtf(this string value)
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{
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return RichTextToPlainText.ConvertToText(value);
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}
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public static string RemoveChar(this string value, char removeChar)
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{
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char[] array = new char[value.Length];
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int arrayIndex = 0;
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for (int i = 0; i < value.Length; i++)
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{
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char ch = value[i];
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if (ch != removeChar)
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array[arrayIndex++] = ch;
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}
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return new string(array, 0, arrayIndex);
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}
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/// <summary>
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/// Count characters excl. white spaces/ssa-tags/html-tags and normal space depending on parameter.
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/// </summary>
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public static int CountCharacters(this string value, bool removeNormalSpace)
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{
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int length = 0;
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const char zeroWidthSpace = '\u200B';
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const char zeroWidthNoBreakSpace = '\uFEFF';
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char normalSpace = removeNormalSpace ? ' ' : zeroWidthSpace;
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bool ssaTagOn = false;
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bool htmlTagOn = false;
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for (int i = 0; i < value.Length; i++)
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{
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char ch = value[i];
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if (ssaTagOn)
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{
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if (ch == '}')
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ssaTagOn = false;
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}
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else if (htmlTagOn)
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{
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if (ch == '>')
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htmlTagOn = false;
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}
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else if (ch == '{' && i < value.Length - 1 && value[i + 1] == '\\')
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{
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ssaTagOn = true;
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}
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else if (ch == '<' && i < value.Length - 1 && (value[i + 1] == '/' || char.IsLetter(value[i + 1])) && value.IndexOf('>', i) > 0)
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{
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htmlTagOn = true;
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}
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else if (ch != '\n' && ch != '\r' && ch != '\t' && ch != zeroWidthSpace && ch != zeroWidthNoBreakSpace && ch != normalSpace)
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{
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length++;
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}
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}
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return length;
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}
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}
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}
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