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ResumableTokenStreamTests.cs
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ResumableTokenStreamTests.cs
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using System;
using System.IO;
using Pidgin.TokenStreams;
using Xunit;
namespace Pidgin.Tests;
public class ResumableTokenStreamTests
{
[Fact]
public void TestResume()
{
var input = "aaabb";
using var stream = new ResumableTokenStream<char>(new ReaderTokenStream(new StringReader(input)));
// consume two 'a's, reject the third one
var chunk = new char[3].AsSpan();
stream.Read(chunk);
stream.Return(chunk[2..]);
stream.Read(chunk);
Assert.Equal("abb", chunk.ToString());
}
[Fact]
public void TestReturnMultipleChunks()
{
using var stream = new ResumableTokenStream<char>(new ReaderTokenStream(new StringReader("cc")));
stream.Return("bb");
stream.Return("aa");
var chunk = new char[6].AsSpan();
stream.Read(chunk);
Assert.Equal("aabbcc", chunk.ToString());
}
[Fact]
public void TestReturnMultipleChunks_GrowBuffer()
{
using var stream = new ResumableTokenStream<char>(new ReaderTokenStream(new StringReader("cc")));
stream.Return("bb");
stream.Return(new string('a', 16)); // default buffer size is 16
var chunk = new char[20].AsSpan();
stream.Read(chunk);
Assert.Equal(new string('a', 16) + "bbcc", chunk.ToString());
}
[Fact]
public void TestParseFromResumableTokenStream()
{
var input = "aaabb";
using var stream = new ResumableTokenStream<char>(new ReaderTokenStream(new StringReader(input)));
var parser = Parser.String("aaa");
var result = parser.Parse(stream);
Assert.Equal("aaa", result.Value);
var chunk = new char[2].AsSpan();
stream.Read(chunk);
Assert.Equal("bb", chunk.ToString());
}
}