#JustSayNoToRegex
Toma un identificador de C #, con uderscores y números, y lo convierte en una cadena separada por espacios.
public static class StringExtensions
{
public static string SplitOnCase(this string identifier)
{
if (identifier == null || identifier.Length == 0) return string.Empty;
var sb = new StringBuilder();
if (identifier.Length == 1) sb.Append(char.ToUpperInvariant(identifier[0]));
else if (identifier.Length == 2) sb.Append(char.ToUpperInvariant(identifier[0])).Append(identifier[1]);
else {
if (identifier[0] != '_') sb.Append(char.ToUpperInvariant(identifier[0]));
for (int i = 1; i < identifier.Length; i++) {
var current = identifier[i];
var previous = identifier[i - 1];
if (current == '_' && previous == '_') continue;
else if (current == '_') {
sb.Append(' ');
}
else if (char.IsLetter(current) && previous == '_') {
sb.Append(char.ToUpperInvariant(current));
}
else if (char.IsDigit(current) && char.IsLetter(previous)) {
sb.Append(' ').Append(current);
}
else if (char.IsLetter(current) && char.IsDigit(previous)) {
sb.Append(' ').Append(char.ToUpperInvariant(current));
}
else if (char.IsUpper(current) && char.IsLower(previous)
&& (i < identifier.Length - 1 && char.IsUpper(identifier[i + 1]) || i == identifier.Length - 1)) {
sb.Append(' ').Append(current);
}
else if (char.IsUpper(current) && i < identifier.Length - 1 && char.IsLower(identifier[i + 1])) {
sb.Append(' ').Append(current);
}
else {
sb.Append(current);
}
}
}
return sb.ToString();
}
}
Pruebas:
[TestFixture]
static class HelpersTests
{
[Test]
public static void Basic()
{
Assert.AreEqual("Foo", "foo".SplitOnCase());
Assert.AreEqual("Foo", "_foo".SplitOnCase());
Assert.AreEqual("Foo", "__foo".SplitOnCase());
Assert.AreEqual("Foo", "___foo".SplitOnCase());
Assert.AreEqual("Foo 2", "foo2".SplitOnCase());
Assert.AreEqual("Foo 23", "foo23".SplitOnCase());
Assert.AreEqual("Foo 23 A", "foo23A".SplitOnCase());
Assert.AreEqual("Foo 23 Ab", "foo23Ab".SplitOnCase());
Assert.AreEqual("Foo 23 Ab", "foo23_ab".SplitOnCase());
Assert.AreEqual("Foo 23 Ab", "foo23___ab".SplitOnCase());
Assert.AreEqual("Foo 23", "foo__23".SplitOnCase());
Assert.AreEqual("Foo Bar", "Foo_bar".SplitOnCase());
Assert.AreEqual("Foo Bar", "Foo____bar".SplitOnCase());
Assert.AreEqual("AAA", "AAA".SplitOnCase());
Assert.AreEqual("Foo A Aa", "fooAAa".SplitOnCase());
Assert.AreEqual("Foo AAA", "fooAAA".SplitOnCase());
Assert.AreEqual("Foo Bar", "FooBar".SplitOnCase());
Assert.AreEqual("Mn M", "MnM".SplitOnCase());
Assert.AreEqual("AS", "aS".SplitOnCase());
Assert.AreEqual("As", "as".SplitOnCase());
Assert.AreEqual("A", "a".SplitOnCase());
Assert.AreEqual("_", "_".SplitOnCase());
}
}