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CharUtilities.cs
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CharUtilities.cs
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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
namespace Gsemac.Text {
public static class CharUtilities {
// Public members
public static bool IsLeftEnclosingPunctuation(char value) {
return enclosingPunctuationDict.Value.ContainsKey(value);
}
public static bool IsRightEnclosingPunctuation(char value) {
return enclosingPunctuationDict.Value.Values.Contains(value);
}
public static bool IsEnclosingPunctuation(char value) {
return IsLeftEnclosingPunctuation(value) ||
IsRightEnclosingPunctuation(value);
}
public static char GetOppositeEnclosingPunctuation(char value) {
if (enclosingPunctuationDict.Value.TryGetValue(value, out char complementChar))
return complementChar;
if (enclosingPunctuationDict.Value.ToDictionary(t => t.Value, t => t.Key).TryGetValue(value, out complementChar))
return complementChar;
return value;
}
public static bool IsNewLine(char value) {
return value == '\r' || value == '\n';
}
public static bool IsTerminalPunctuation(char value) {
switch (value) {
case '.':
case '!':
case '?':
return true;
default:
return false;
}
}
public static bool IsWordChar(char value) {
// Returns true if the character is a word character as defined by the regex metacharacter "\w".
// Solution adapted from the one given here: https://stackoverflow.com/a/33809007/5383169 (thargy)
UnicodeCategory category = char.GetUnicodeCategory(value);
switch (category) {
case UnicodeCategory.ConnectorPunctuation:
case UnicodeCategory.DecimalDigitNumber:
case UnicodeCategory.LowercaseLetter:
case UnicodeCategory.ModifierLetter:
case UnicodeCategory.NonSpacingMark:
case UnicodeCategory.OtherLetter:
case UnicodeCategory.SpacingCombiningMark:
case UnicodeCategory.TitlecaseLetter:
case UnicodeCategory.UppercaseLetter:
return true;
default:
return false;
}
}
public static bool IsVowel(char value) {
return "aeiou".Contains(char.ToLowerInvariant(value));
}
// Private members
private static readonly Lazy<IDictionary<char, char>> enclosingPunctuationDict = new Lazy<IDictionary<char, char>>(CreateEnclosingPunctuationDict);
private static IDictionary<char, char> CreateEnclosingPunctuationDict() {
// The following types of enclosing punctuation were found here: https://en.wikipedia.org/wiki/Bracket#Unicode
return new Dictionary<char, char> {
// General purpose
{'(', ')' },
{'[', ']' },
// Technical/mathematical(common)
{'<', '>' },
{'{', '}' },
// Quotation (Western texts)
{'\'', '\'' },
{'"', '"' },
{'«', '»' },
{'‹', '›' },
{'“', '”' },
{'‘', '’' },
{'‚', '‘' },
{'„', '“' },
// Floor and ceiling functions
{ '⌈', '⌉' },
{ '⌊', '⌋' },
// Quine corners
{ '⌜', '⌝' },
{ '⌞', '⌟' },
// Technical/mathematical (specialized)
{ '⁽', '⁾' },
{ '₍', '₎' },
{ '⎛', '⎞' },
{ '⎜', '⎟' },
{ '⎝', '⎠' },
{ '⎡', '⎤' },
{ '⎢', '⎥' },
{ '⎣', '⎦' },
{ '⎧', '⎫' },
{ '⎨', '⎬' },
{ '⎩', '⎭' },
{ '⎪', '⎪' },
{ '⎰', '⎱' },
{ '⎱', '⎰' },
{ '⎴', '⎵' },
{ '⎸', '⎹' },
{ '⏜', '⏝' },
{ '⏞', '⏟' },
{ '⏠', '⏡' },
{ '⟅', '⟆' },
{ '⟓', '⟔' },
{'⟦', '⟧' },
{'⟨', '⟩' },
{'⟪', '⟫' },
{'⟬', '⟭' },
{'⟮', '⟯' },
{'⦃', '⦄' },
{'⦅', '⦆' },
{'⦇', '⦈' },
{'⦉', '⦊' },
{'⦋', '⦌' },
{'⦍', '⦐' },
{'⦏', '⦎' },
{'⦑', '⦒' },
{'⦓', '⦔' },
{'⦕', '⦖' },
{'⦗', '⦘' },
{'⧘', '⧙' },
{'⧚', '⧛' },
{'⧼', '⧽' },
// Half brackets
{'⸢', '⸣' },
{'⸤', '⸥' },
// Dingbats
{ '❨', '❩' },
{'❪', '❫' },
{'❬', '❭' },
{'❰', '❱' },
{'❮', '❯' },
{'❲', '❳' },
{'❴', '❵' },
// Arabic (Quranic quotations)
{'﴾', '﴿' },
// N'Ko
{'⸝', '⸜' },
// Ogham
{'᚛', '᚜' },
// Tibetan
{'༺', '༻' },
{'༼', '༽' },
// New Testament editorial marks
{ '⸂', '⸃' },
{ '⸄', '⸅' },
{ '⸉', '⸊' },
{ '⸌', '⸍' },
// Medieval studies
{ '⁅', '⁆' },
{ '⸦', '⸧' },
{ '⸨', '⸩' },
// Quotation (East-Asian texts)
{'〔', '〕' },
{'〖', '〗' },
{'〘', '〙' },
{'〚', '〛' },
{'〝', '〞' },
// Quotation (halfwidth East-Asian texts)
{'〈', '〉' },
{'｢', '｣' },
// Quotation (fullwidth East-Asian texts)
{'《', '》' },
{'「', '」' },
{'『', '』' },
{'【', '】' },
// General purpose (fullwidth East-Asian)
{ '（', '）' },
{'［', '］' },
{'＜', '＞' },
// Technical/mathematical (fullwidth East-Asian)
{'｛', '｝' },
{'｟', '｠' },
};
}
}
}