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Add reading of number tokens

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This commit is contained in:
Andrew Cooper
2022-02-11 22:16:03 +11:00
parent 151144e9e2
commit 8d04213ccd
4 changed files with 113 additions and 26 deletions
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17
00_Common/dotnet/Games.Common/IO/TokenReader.cs
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@@ -5,15 +5,21 @@ namespace Games.Common.IO
{
internal class TokenReader
{
private readonly TextIO _io;
private readonly Func<Token, bool> _isTokenValid;
private const string NumberExpected = "!Number expected - retry input line";
private const string ExtraInput = "!Extra input ignored";
public TokenReader(TextIO io, Func<Token, bool>? isTokenValid = null)
private readonly TextIO _io;
private readonly Predicate<Token> _isTokenValid;
private TokenReader(TextIO io, Predicate<Token> isTokenValid)
{
_io = io;
_isTokenValid = isTokenValid ?? (t => true);
}
public static TokenReader ForStrings(TextIO io) => new(io, t => true);
public static TokenReader ForNumbers(TextIO io) => new(io, t => t.IsNumber);
public IEnumerable<Token> ReadTokens(string prompt, uint quantityNeeded)
{
if (quantityNeeded == 0)
@@ -44,8 +50,9 @@ namespace Games.Common.IO
{
if (!_isTokenValid(token))
{
_io.WriteLine(NumberExpected);
tokensValid = false;
prompt = "?";
prompt = "";
break;
}
@@ -64,7 +71,7 @@ namespace Games.Common.IO
{
if (++tokenCount > maxCount)
{
_io.WriteLine("!Extra input ingored");
_io.WriteLine(ExtraInput);
break;
}