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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Text;
using System.Web.Razor.Resources;
using System.Web.Razor.Text;
using Assert = Microsoft.TestCommon.AssertEx;
namespace System.Web.Razor.Test.Text
{
public abstract class LookaheadTextReaderTestBase
{
protected abstract LookaheadTextReader CreateReader(string testString);
protected void RunPeekTest(string input, int peekAt = 0)
{
RunPeekOrReadTest(input, peekAt, false);
}
protected void RunReadTest(string input, int readAt = 0)
{
RunPeekOrReadTest(input, readAt, true);
}
protected void RunSourceLocationTest(string input, SourceLocation expected, int checkAt = 0)
{
RunSourceLocationTest(input, expected, r => AdvanceReader(checkAt, r));
}
protected void RunSourceLocationTest(string input, SourceLocation expected, Action<LookaheadTextReader> readerAction)
{
// Arrange
LookaheadTextReader reader = CreateReader(input);
readerAction(reader);
// Act
SourceLocation actual = reader.CurrentLocation;
// Assert
Assert.Equal(expected, actual);
}
protected void RunEndLookaheadUpdatesSourceLocationTest()
{
SourceLocation? expectedLocation = null;
SourceLocation? actualLocation = null;
RunLookaheadTest("abc\r\ndef\r\nghi", null,
Read(6),
CaptureSourceLocation(s => expectedLocation = s),
Lookahead(Read(6)),
CaptureSourceLocation(s => actualLocation = s));
// Assert
Assert.Equal(expectedLocation.Value.AbsoluteIndex, actualLocation.Value.AbsoluteIndex);
Assert.Equal(expectedLocation.Value.CharacterIndex, actualLocation.Value.CharacterIndex);
Assert.Equal(expectedLocation.Value.LineIndex, actualLocation.Value.LineIndex);
}
protected void RunReadToEndTest()
{
// Arrange
LookaheadTextReader reader = CreateReader("abcdefg");
// Act
string str = reader.ReadToEnd();
// Assert
Assert.Equal("abcdefg", str);
}
protected void RunCancelBacktrackOutsideLookaheadTest()
{
// Arrange
LookaheadTextReader reader = CreateReader("abcdefg");
// Act and Assert
Assert.Throws<InvalidOperationException>(() => reader.CancelBacktrack(), RazorResources.CancelBacktrack_Must_Be_Called_Within_Lookahead);
}
protected Action<StringBuilder, LookaheadTextReader> CaptureSourceLocation(Action<SourceLocation> capture)
{
return (_, reader) => { capture(reader.CurrentLocation); };
}
protected Action<StringBuilder, LookaheadTextReader> Read(int count)
{
return (builder, reader) =>
{
for (int i = 0; i < count; i++)
{
Read(builder, reader);
}
};
}
protected void Read(StringBuilder builder, LookaheadTextReader reader)
{
builder.Append((char)reader.Read());
}
protected void ReadToEnd(StringBuilder builder, LookaheadTextReader reader)
{
builder.Append(reader.ReadToEnd());
}
protected void CancelBacktrack(StringBuilder builder, LookaheadTextReader reader)
{
reader.CancelBacktrack();
}
protected Action<StringBuilder, LookaheadTextReader> Lookahead(params Action<StringBuilder, LookaheadTextReader>[] readerCommands)
{
return (builder, reader) =>
{
using (reader.BeginLookahead())
{
RunAll(readerCommands, builder, reader);
}
};
}
protected void RunLookaheadTest(string input, string expected, params Action<StringBuilder, LookaheadTextReader>[] readerCommands)
{
// Arrange
StringBuilder builder = new StringBuilder();
using (LookaheadTextReader reader = CreateReader(input))
{
RunAll(readerCommands, builder, reader);
}
if (expected != null)
{
Assert.Equal(expected, builder.ToString());
}
}
protected void RunReadUntilTest(Func<LookaheadTextReader, string> readMethod, int expectedRaw, int expectedChar, int expectedLine)
{
// Arrange
LookaheadTextReader reader = CreateReader("a\r\nbcd\r\nefg");
reader.Read(); // Reader: "\r\nbcd\r\nefg"
reader.Read(); // Reader: "\nbcd\r\nefg"
reader.Read(); // Reader: "bcd\r\nefg"
// Act
string read = null;
SourceLocation actualLocation;
using (reader.BeginLookahead())
{
read = readMethod(reader);
actualLocation = reader.CurrentLocation;
}
// Assert
Assert.Equal(3, reader.CurrentLocation.AbsoluteIndex);
Assert.Equal(0, reader.CurrentLocation.CharacterIndex);
Assert.Equal(1, reader.CurrentLocation.LineIndex);
Assert.Equal(expectedRaw, actualLocation.AbsoluteIndex);
Assert.Equal(expectedChar, actualLocation.CharacterIndex);
Assert.Equal(expectedLine, actualLocation.LineIndex);
Assert.Equal('b', reader.Peek());
Assert.Equal(read, readMethod(reader));
}
protected void RunBufferReadTest(Func<LookaheadTextReader, char[], int, int, int> readMethod)
{
// Arrange
LookaheadTextReader reader = CreateReader("abcdefg");
reader.Read(); // Reader: "bcdefg"
// Act
char[] buffer = new char[4];
int read = -1;
SourceLocation actualLocation;
using (reader.BeginLookahead())
{
read = readMethod(reader, buffer, 0, 4);
actualLocation = reader.CurrentLocation;
}
// Assert
Assert.Equal("bcde", new String(buffer));
Assert.Equal(4, read);
Assert.Equal(5, actualLocation.AbsoluteIndex);
Assert.Equal(5, actualLocation.CharacterIndex);
Assert.Equal(0, actualLocation.LineIndex);
Assert.Equal(1, reader.CurrentLocation.CharacterIndex);
Assert.Equal(0, reader.CurrentLocation.LineIndex);
Assert.Equal('b', reader.Peek());
}
private static void RunAll(Action<StringBuilder, LookaheadTextReader>[] readerCommands, StringBuilder builder, LookaheadTextReader reader)
{
foreach (Action<StringBuilder, LookaheadTextReader> readerCommand in readerCommands)
{
readerCommand(builder, reader);
}
}
private void RunPeekOrReadTest(string input, int offset, bool isRead)
{
using (LookaheadTextReader reader = CreateReader(input))
{
AdvanceReader(offset, reader);
// Act
int? actual = null;
if (isRead)
{
actual = reader.Read();
}
else
{
actual = reader.Peek();
}
Assert.NotNull(actual);
// Asserts
AssertReaderValueCorrect(actual.Value, input, offset, "Peek");
if (isRead)
{
AssertReaderValueCorrect(reader.Peek(), input, offset + 1, "Read");
}
else
{
Assert.Equal(actual, reader.Peek());
}
}
}
private static void AdvanceReader(int offset, LookaheadTextReader reader)
{
for (int i = 0; i < offset; i++)
{
reader.Read();
}
}
private void AssertReaderValueCorrect(int actual, string input, int expectedOffset, string methodName)
{
if (expectedOffset < input.Length)
{
Assert.Equal(input[expectedOffset], actual);
}
else
{
Assert.Equal(-1, actual);
}
}
}
}
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