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Rename string.Random to string.Randomize

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Implements better logic for generating a random string
This commit is contained in:
Oliver Booth 2021-03-10 12:51:09 +00:00
parent 00b751b555
commit b8d9d880a8
1 changed files with 54 additions and 16 deletions
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70
X10D/src/StringExtensions/StringExtensions.cs
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@ -4,6 +4,7 @@ using System.Linq;
using System.Text; using System.Text;
using X10D.EnumerableExtensions; using X10D.EnumerableExtensions;
using X10D.ListExtensions; using X10D.ListExtensions;
using X10D.RandomExtensions;
namespace X10D.StringExtensions namespace X10D.StringExtensions
{ {
@ -235,32 +236,69 @@ namespace X10D.StringExtensions
} }
/// <summary> /// <summary>
/// Generates a new random string by filling it with characters found in <see cref="str" />. /// Returns a new string of a specified length by randomly selecting characters from the current string.
/// </summary> /// </summary>
/// <param name="str">The character set.</param> /// <param name="source">The pool of characters to use.</param>
/// <param name="length">The length of the string to generate.</param> /// <param name="length">The length of the new string returned.</param>
/// <returns>Returns a <see cref="string" /> containing <paramref name="length" /> characters.</returns> /// <returns>
public static string Random(this string str, int length) /// A new string whose length is equal to <paramref name="length" /> which contains randomly selected characters from
/// <paramref name="source" />.
/// </returns>
/// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="length" /> is less than 0.</exception>
public static string Randomize(this string source, int length)
{ {
return str.Random(length, RandomExtensions.Random); return source.Randomize(length, RandomExtensions.RandomExtensions.Random);
} }
/// <summary> /// <summary>
/// Generates a new random string by filling it with characters found in <see cref="str" />. /// Returns a new string of a specified length by randomly selecting characters from the current string.
/// </summary> /// </summary>
/// <param name="str">The character set.</param> /// <param name="source">The pool of characters to use.</param>
/// <param name="length">The length of the string to generate.</param> /// <param name="length">The length of the new string returned.</param>
/// <param name="random">The <see cref="System.Random" /> instance.</param> /// <param name="random">The <see cref="System.Random" /> supplier.</param>
/// <returns>Returns a <see cref="string" /> containing <paramref name="length" /> characters.</returns> /// <returns>
/// <exception cref="ArgumentNullException"><paramref name="str" /> is <see langword="null" />.</exception> /// A new string whose length is equal to <paramref name="length" /> which contains randomly selected characters from
public static string Random(this string str, int length, Random random) /// <paramref name="source" />.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source" /> is <see langword="null" />.
/// -or-
/// <paramref name="random" /> is <see langword="null" />.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="length" /> is less than 0.</exception>
public static string Randomize(this string source, int length, Random random)
{ {
if (str is null) if (source is null)
{ {
throw new ArgumentNullException(nameof(str)); throw new ArgumentNullException(nameof(source));
} }
return str.ToCharArray().Random(length, random); if (random is null)
{
throw new ArgumentNullException(nameof(random));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length), ExceptionMessages.LengthGreaterThanOrEqualTo0);
}
if (length == 0)
{
return string.Empty;
}
var array = source.ToCharArray();
var builder = new StringBuilder(length);
while (builder.Length < length)
{
var next = random.NextFrom(array);
builder.Append(next);
}
return builder.ToString();
} }
/// <summary> /// <summary>