/// <summary>
/// Removes the specified vishraams from a string.
/// </summary>
/// <param name="text">The text to remove vishraams from.</param>
/// <param name="vishraams">The vishraams to remove. Defaults to all.</param>
/// <returns>A vishraam-less Gurmukhi string.</returns>
public static string StripVishraams(string text,
Vishraam vishraams = Vishraam.Heavy | Vishraam.Medium | Vishraam.Light)
{
var vishraamMapping = Mapping.VishraamMapping();
var vishraamOptions = Enum.GetValues(vishraams.GetType())
.Cast <Enum>()
.Where(vishraams.HasFlag)
.Select(value => vishraamMapping[value.ToString()].ToString());
return(Regex.Replace(text, StringRegexHelper.GetRegexClass(vishraamOptions), ""));
}
/// <summary>
/// Strips line endings from any Gurmukhi or translation string.
/// Accepts both Unicode and ASCII input.
/// Useful for generating accurate first letters or modifying non-Gurbani for better display.
/// *Not* designed for headings or Sirlekhs.
/// </summary>
/// <param name="text">The text to stip endings from.</param>
/// <returns>A ending-less version of the text.</returns>
public static string StripEndings(string text)
{
// Line endings in both ASCII, Unicode, and English
var endingClass = StringRegexHelper.GetRegexClass(new[] { "।", "॥", "]", "[", "|" });
// Sometimes translation line endings begin with these characters, before numbers
var optionalEndingClass = StringRegexHelper.GetRegexClass(new[] { "(" });
// Remove any broken endings
var brokenEndingClass = StringRegexHelper.GetRegexGroup(new[] { "()" });
// All numbers in ASCII, Unicode
var numbers = Enumerable.Range(0, 10).ToArray()
.Select(i => i.ToString())
.ToArray();
var numberClass = StringRegexHelper.GetRegexClass(
numbers
.Concat(numbers.Select(ToUnicodeGurmukhi))
.Concat(numbers.Select(ToUnicodeGurmukhi).Select(ToHindi))
);
// Rahao in English, ASCII, Unicode
var pauseGroup = StringRegexHelper
.GetRegexGroup(new[] { "ਰਹਾਉ", ToAsciiGurmukhi("ਰਹਾਉ"), "Pause" });
// Matchers to strip out of input string
var matchers = new[]
{
// Any pause (ending + pause word) => match the rest of the line
$" ?{endingClass} ?{pauseGroup}.*",
// Any ending followed by any number => match the rest of the line
$" ?({endingClass}|{optionalEndingClass}){numberClass}.*",
// Any sequence at the end of a line with numbers, periods, and spaces beginning with a number
$" ?{numberClass}({numberClass}|[. ])*$",
// Clean up any lingering ending characters
$" ?{brokenEndingClass}",
$" ?{endingClass}",
};
return(matchers.Aggregate(text, (a, b) =>
Regex.Replace(a, b, "").Trim()));
}