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ParseStateTests.cs
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ParseStateTests.cs
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using System;
using System.IO;
using System.Numerics;
using Pidgin.Configuration;
using Pidgin.TokenStreams;
using Xunit;
namespace Pidgin.Tests;
public class ParseStateTests
{
[Fact]
public void TestEmptyInput()
{
var input = "";
using var state = new ParseState<char>(CharDefaultConfiguration.Instance, ToStream(input));
Assert.Equal(SourcePosDelta.Zero, state.ComputeSourcePosDelta());
Assert.False(state.HasCurrent);
}
[Fact]
public void TestAdvance()
{
var input = "foo";
var state = new ParseState<char>(CharDefaultConfiguration.Instance, ToStream(input));
Consume('f', ref state);
Consume('o', ref state);
Consume('o', ref state);
Assert.False(state.HasCurrent);
}
[Fact]
public void TestDiscardChunk()
{
var input = 'f' + new string('o', ChunkSize); // Length == ChunkSize + 1
var state = new ParseState<char>(CharDefaultConfiguration.Instance, ToStream(input));
Consume('f', ref state);
Consume(new string('o', ChunkSize), ref state);
Assert.False(state.HasCurrent);
Assert.Equal(new SourcePosDelta(0, input.Length), state.ComputeSourcePosDelta());
}
[Fact]
public void TestSaveWholeChunkAligned()
{
// grows buffer on final iteration of loop
//
// |----|----|
// foooo
// ^----
AlignedChunkTest(ChunkSize);
}
[Fact]
public void TestSaveWholeChunkUnaligned()
{
// grows buffer on final iteration of loop
//
// |----|----|
// faoooo
// ^----
UnalignedChunkTest(ChunkSize);
}
[Fact]
public void TestSaveMoreThanWholeChunkAligned()
{
// grows buffer on penultimate iteration of loop
//
// |----|----|
// fooooo
// ^-----
AlignedChunkTest(ChunkSize + 1);
}
[Fact]
public void TestSaveMoreThanWholeChunkUnaligned()
{
// grows buffer on penultimate iteration of loop
//
// |----|----|
// faoooo
// ^----
UnalignedChunkTest(ChunkSize + 1);
}
[Fact]
public void TestSaveLessThanWholeChunkAligned()
{
// does not grow buffer
//
// |----|----|
// fooooo
// ^-----
AlignedChunkTest(ChunkSize - 1);
}
[Fact]
public void TestSaveLessThanWholeChunkUnaligned()
{
// does not grow buffer
//
// |----|----|
// fooooo
// ^-----
UnalignedChunkTest(ChunkSize - 1);
}
[Fact]
public void TestComputeSourcePos_Default()
{
{
var input = "a\n\nb";
using var state = new ParseState<char>(DefaultConfiguration<char>.Instance, input.AsSpan());
state.Advance(input.Length);
Assert.Equal(new SourcePosDelta(0, 4), state.ComputeSourcePosDelta());
}
}
[Fact]
public void TestComputeSourcePos_CharDefault()
{
var input = "a\n\nb" // a partial chunk containing multiple newlines
+ "\n" + new string('a', Vector<short>.Count - 2) + "\n" // multiple whole chunks with multiple newlines
+ "\n" + new string('a', Vector<short>.Count - 2) + "\n" // ...
+ "\t" + new string('a', (Vector<short>.Count * 2) - 2) + "\t" // multiple whole chunks with tabs and no newlines
+ "aa"; // a partial chunk with no newlines
{
using var state = new ParseState<char>(CharDefaultConfiguration.Instance, input.AsSpan());
state.Advance(input.Length);
Assert.Equal(new SourcePosDelta(6, (Vector<short>.Count * 2) + 8), state.ComputeSourcePosDelta());
}
{
using var state = new ParseState<char>(CharDefaultConfiguration.Instance, input.AsSpan());
state.Advance(1);
state.ComputeSourcePosDelta();
state.Advance(input.Length - 1);
Assert.Equal(new SourcePosDelta(6, (Vector<short>.Count * 2) + 8), state.ComputeSourcePosDelta());
}
}
private static void AlignedChunkTest(int inputLength)
{
var input = 'f' + new string('o', inputLength - 1);
var state = new ParseState<char>(CharDefaultConfiguration.Instance, ToStream(input));
var bookmark = state.Bookmark();
Consume('f', ref state);
Consume(new string('o', inputLength - 1), ref state);
Assert.False(state.HasCurrent);
Assert.Equal(new SourcePosDelta(0, inputLength), state.ComputeSourcePosDelta());
state.Rewind(bookmark);
Assert.Equal(SourcePosDelta.Zero, state.ComputeSourcePosDelta());
Consume('f', ref state);
}
private static void UnalignedChunkTest(int inputLength)
{
var input = "fa" + new string('o', inputLength - 2);
var state = new ParseState<char>(CharDefaultConfiguration.Instance, ToStream(input));
Consume('f', ref state);
var bookmark = state.Bookmark();
Consume('a' + new string('o', inputLength - 2), ref state);
Assert.False(state.HasCurrent);
Assert.Equal(new SourcePosDelta(0, inputLength), state.ComputeSourcePosDelta());
state.Rewind(bookmark);
Assert.Equal(SourcePosDelta.OneCol, state.ComputeSourcePosDelta());
Consume('a', ref state);
}
private static void Consume(char expected, ref ParseState<char> state)
{
var oldCols = state.ComputeSourcePosDelta().Cols;
Assert.True(state.HasCurrent);
Assert.Equal(expected, state.Current);
state.Advance();
Assert.Equal(oldCols + 1, state.ComputeSourcePosDelta().Cols);
}
private static void Consume(string expected, ref ParseState<char> state)
{
var oldCols = state.ComputeSourcePosDelta().Cols;
AssertEqual(expected.AsSpan(), state.LookAhead(expected.Length));
state.Advance(expected.Length);
Assert.Equal(oldCols + expected.Length, state.ComputeSourcePosDelta().Cols);
}
private static void AssertEqual(ReadOnlySpan<char> expected, ReadOnlySpan<char> actual)
{
Assert.Equal(expected.Length, actual.Length);
for (var i = 0; i < expected.Length; i++)
{
Assert.Equal(expected[i], actual[i]);
}
}
private static ReaderTokenStream ToStream(string input)
=> new(new StringReader(input));
private static int ChunkSize => ToStream("").ChunkSizeHint;
}