private void ParseReplacement(TokenReader<DocumentToken> reader, List<IDocumentExpression> ret)
{
var openToken = AdvanceAndExpectConstantType(reader, DocumentTokenType.BeginReplacementSegment);
var replacementKeyToken = AdvanceAndExpect(reader, DocumentTokenType.ReplacementKey, "replacement key", skipWhitespace: true);
List<DocumentToken> parameters = new List<DocumentToken>();
List<DocumentToken> body = new List<DocumentToken>();
while (reader.CanAdvance(skipWhitespace: true) && reader.Peek(skipWhitespace: true).TokenType == DocumentTokenType.ReplacementParameter)
{
var paramToken = reader.Advance(skipWhitespace: true);
parameters.Add(paramToken);
}
DocumentToken closeReplacementToken;
if(reader.TryAdvance(out closeReplacementToken, skipWhitespace: true) == false)
{
throw Unexpected(string.Format("'{0}' or '{1}'", DocumentToken.GetTokenTypeValue(DocumentTokenType.EndReplacementSegment), DocumentToken.GetTokenTypeValue(DocumentTokenType.QuickTerminateReplacementSegment)));
}
if (closeReplacementToken.TokenType == DocumentTokenType.EndReplacementSegment)
{
body.AddRange(ReadReplacementBody(reader, replacementKeyToken));
}
else if (closeReplacementToken.TokenType == DocumentTokenType.QuickTerminateReplacementSegment)
{
// do nothing, there is no body when the quick termination replacement segment is used
}
else
{
throw Unexpected(string.Format("'{0}' or '{1}'", DocumentToken.GetTokenTypeValue(DocumentTokenType.EndReplacementSegment), DocumentToken.GetTokenTypeValue(DocumentTokenType.QuickTerminateReplacementSegment)), closeReplacementToken);
}
IDocumentExpressionProvider provider;
if (this.expressionProviders.TryGetValue(replacementKeyToken.Value, out provider) == false)
{
provider = new EvalExpressionProvider();
}
var context = new DocumentExpressionContext
{
OpenToken = openToken,
CloseToken = closeReplacementToken,
Parameters = parameters.AsReadOnly(),
Body = body.AsReadOnly(),
ReplacementKeyToken = replacementKeyToken,
};
var expression = provider.CreateExpression(context);
ret.Add(expression);
}
private List<DocumentToken> ReadReplacementBody(TokenReader<DocumentToken> reader, DocumentToken replacementKeyToken)
{
List<DocumentToken> replacementContents = new List<DocumentToken>();
int numOpenReplacements = 1;
while (reader.CanAdvance())
{
if (reader.Peek().TokenType == DocumentTokenType.BeginReplacementSegment)
{
numOpenReplacements++;
}
else if (reader.Peek().TokenType == DocumentTokenType.QuickTerminateReplacementSegment)
{
numOpenReplacements--;
if(numOpenReplacements == 0)
{
throw Unexpected(reader.Peek());
}
}
else if (reader.Peek().TokenType == DocumentTokenType.BeginTerminateReplacementSegment)
{
numOpenReplacements--;
if(numOpenReplacements == 0)
{
AdvanceAndExpectConstantType(reader, DocumentTokenType.BeginTerminateReplacementSegment);
AdvanceAndExpect(reader, DocumentTokenType.ReplacementKey, replacementKeyToken.Value, skipWhitespace: true);
AdvanceAndExpectConstantType(reader, DocumentTokenType.EndReplacementSegment);
break;
}
}
replacementContents.Add(reader.Advance());
}
if(numOpenReplacements != 0)
{
throw Unexpected("end of '" + replacementKeyToken.Value + "' replacement");
}
return replacementContents;
}
/// <summary>
/// Parses the given tokens into document expressions that can then be evaluated against a data context.
/// </summary>
/// <param name="tokens">The tokens to parse</param>
/// <returns>a list of document expressions</returns>
public List<IDocumentExpression> Parse(IEnumerable<DocumentToken> tokens)
{
List<IDocumentExpression> ret = new List<IDocumentExpression>();
TokenReader<DocumentToken> reader = new TokenReader<DocumentToken>(tokens);
while(reader.CanAdvance())
{
if(reader.Peek().TokenType == DocumentTokenType.BeginReplacementSegment)
{
ParseReplacement(reader, ret);
}
else
{
var plain = new PlainTextDocumentExpression(reader.Advance());
ret.Add(plain);
}
}
return ret;
}
/// <summary>
/// Deserializes the given frame given a known width and height.
/// </summary>
/// <param name="serializedFrame">the frame data</param>
/// <param name="width">the known width of the frame</param>
/// <param name="height">the known height of the frame</param>
/// <returns>a deserialized frame that's either a raw frame or a diff frame, depending on what was in the serialized string</returns>
public ConsoleBitmapFrame DeserializeFrame(string serializedFrame, int width, int height)
{
var tokens = tokenizer.Tokenize(serializedFrame);
var reader = new TokenReader<Token>(tokens);
reader.Expect("[");
var timestampToken = reader.Advance();
var timestamp = new TimeSpan(long.Parse(timestampToken.Value));
reader.Expect("]");
reader.Expect("[");
reader.Advance();
var isDiff = reader.Current.Value == "Diff";
reader.Expect("]");
if (isDiff)
{
var diffFrame = new ConsoleBitmapDiffFrame()
{
Timestamp = timestamp,
Diffs = new System.Collections.Generic.List<ConsoleBitmapPixelDiff>()
};
var lastBackground = ConsoleString.DefaultBackgroundColor;
var lastForeground = ConsoleString.DefaultForegroundColor;
while (reader.CanAdvance(skipWhitespace: true))
{
reader.Expect("[", skipWhiteSpace: true);
if (reader.Peek().Value.StartsWith("F=") || reader.Peek().Value.StartsWith("B="))
{
reader.Advance();
var match = ColorSpecifierRegex.Match(reader.Current.Value);
if (match.Success == false) throw new FormatException($"Unexpected token {reader.Current.Value} at position {reader.Current.Position} ");
var isForeground = match.Groups["ForB"].Value == "F";
if (isForeground)
{
if (Enum.TryParse(match.Groups["color"].Value, out ConsoleColor c))
{
lastForeground = (RGB)c;
}
else if (RGB.TryParse(match.Groups["color"].Value, out lastForeground) == false)
{
throw new ArgumentException($"Expected a color @ {reader.Position}");
}
}
else
{
if (Enum.TryParse(match.Groups["color"].Value, out ConsoleColor c))
{
lastBackground = (RGB)c;
}
else if (RGB.TryParse(match.Groups["color"].Value, out lastBackground) == false)
{
throw new ArgumentException($"Expected a color @ {reader.Position}");
}
}
reader.Expect("]");
}
else
{
var match = PixelDiffRegex.Match(reader.Advance().Value);
if (match.Success == false) throw new FormatException("Could not parse pixel diff");
var valGroup = match.Groups["val"].Value;
char? nextChar = valGroup.Length == 1 ? valGroup[0] : valGroup == "OB" ? '[' : valGroup == "CB" ? ']' : new char?();
if (nextChar.HasValue == false) throw new FormatException($"Unexpected token {nextChar} @ {reader.Position}");
diffFrame.Diffs.Add(new ConsoleBitmapPixelDiff()
{
X = int.Parse(match.Groups["x"].Value),
Y = int.Parse(match.Groups["y"].Value),
Value = new ConsoleCharacter(nextChar.Value, lastForeground, lastBackground),
});
reader.Expect("]");
}
}
return diffFrame;
}
else
{
var rawFrame = new ConsoleBitmapRawFrame()
{
Timestamp = timestamp,
Pixels = new ConsoleCharacter[width][]
};
for (var i = 0; i < width; i++)
{
rawFrame.Pixels[i] = new ConsoleCharacter[height];
}
var x = 0;
var y = 0;
var lastFg = ConsoleString.DefaultForegroundColor;
var lastBg = ConsoleString.DefaultBackgroundColor;
while (reader.CanAdvance(skipWhitespace:true))
{
reader.Expect("[", skipWhiteSpace:true);
var next = reader.Advance();
var match = ColorSpecifierRegex.Match(next.Value);
if (match.Success)
{
var isForeground = match.Groups["ForB"].Value == "F";
if (isForeground)
{
if(Enum.TryParse<ConsoleColor>(match.Groups["color"].Value, out ConsoleColor c))
{
lastFg = c;
}
else if(RGB.TryParse(match.Groups["color"].Value, out lastFg) == false)
{
throw new ArgumentException($"Expected a color @ {reader.Position}");
}
}
else
{
if (Enum.TryParse<ConsoleColor>(match.Groups["color"].Value, out ConsoleColor c))
{
lastBg = c;
}
else if (RGB.TryParse(match.Groups["color"].Value, out lastBg) == false)
{
throw new ArgumentException($"Expected a color @ {reader.Position}");
}
}
}
else
{
char? nextChar = next.Value.Length == 1 ? next.Value[0] : next.Value == "OB" ? '[' : next.Value == "CB" ? ']' : new char?();
if (nextChar.HasValue == false) throw new FormatException($"Unexpected token {nextChar} @ {next.Position}");
rawFrame.Pixels[x][y++] = new ConsoleCharacter(nextChar.Value, lastFg, lastBg);
if (y == height)
{
y = 0;
x++;
}
}
reader.Expect("]");
}
return rawFrame;
}
}
/// <summary>
/// Creates either an if or an ifnot expression, based on its configuration, using the given document info.
/// </summary>
/// <param name="context">The context that contains information about the document being rendered</param>
/// <returns>The expression, either an if or an ifnot expression</returns>
public IDocumentExpression CreateExpression(DocumentExpressionContext context)
{
TokenReader<DocumentToken> reader = new TokenReader<DocumentToken>(context.Parameters);
DocumentToken ifExpressionToken;
if(reader.TryAdvance(out ifExpressionToken, skipWhitespace: true) == false)
{
throw new DocumentRenderException("missing if expression", context.ReplacementKeyToken);
}
if (reader.CanAdvance(skipWhitespace: true))
{
throw new DocumentRenderException("unexpected parameters after if expression", reader.Advance(skipWhitespace: true));
}
return not ? new IfNotExpression(ifExpressionToken, context.Body) : new IfExpression(ifExpressionToken, context.Body);
}
/// <summary>
/// Parses an object path expression from a string.
/// </summary>
/// <param name="expression">The expression text to parse</param>
/// <returns>The parsed expression</returns>
public static ObjectPathExpression Parse(string expression)
{
if (expression == null) throw new ArgumentNullException("path cannot be null");
if (expression.Length == 0) throw new FormatException("Cannot parse empty string");
Tokenizer<ObjectPathToken> tokenizer = new Tokenizer<ObjectPathToken>();
tokenizer.TokenFactory = ObjectPathToken.TokenFactoryImpl;
tokenizer.WhitespaceBehavior = WhitespaceBehavior.DelimitAndInclude;
tokenizer.DoubleQuoteBehavior = DoubleQuoteBehavior.IncludeQuotedTokensAsStringLiterals;
tokenizer.Delimiters.Add("[");
tokenizer.Delimiters.Add("]");
tokenizer.Delimiters.Add(".");
List<ObjectPathToken> tokens = tokenizer.Tokenize(expression);
TokenReader<ObjectPathToken> reader = new TokenReader<ObjectPathToken>(tokens);
List<IObjectPathElement> pathElements = new List<IObjectPathElement>();
bool lastTokenWasNavigation = false;
while (reader.CanAdvance(skipWhitespace: true))
{
var currentToken = reader.Advance(skipWhitespace: true);
if (lastTokenWasNavigation == true && currentToken.TokenType == ObjectPathTokenType.IndexerOpen)
{
throw new FormatException("Expected property, got '['" + " at " + currentToken.Position);
}
lastTokenWasNavigation = false;
if(pathElements.Count == 0 && currentToken.TokenType == ObjectPathTokenType.NavigationElement)
{
throw new FormatException("Expected property or index, got '" + currentToken.Value + "'" + " at " + currentToken.Position);
}
if (currentToken.TokenType == ObjectPathTokenType.IndexerClose ||
currentToken.TokenType == ObjectPathTokenType.StringLiteral)
{
throw new FormatException("Expected property or index, got '" + currentToken.Value + "'" + " at " + currentToken.Position);
}
if (currentToken.TokenType == ObjectPathTokenType.IndexerOpen)
{
// read index value
if (reader.TryAdvance(out currentToken,skipWhitespace: true) == false) throw new FormatException("Expected index value, got end of string");
if (currentToken.TokenType == ObjectPathTokenType.Identifier || currentToken.TokenType == ObjectPathTokenType.StringLiteral)
{
string indexValueText = currentToken.Value;
if(currentToken.TokenType == ObjectPathTokenType.StringLiteral)
{
indexValueText = indexValueText.Substring(1, indexValueText.Length - 2);
}
object indexValue;
int indexValueInt;
if (int.TryParse(indexValueText, out indexValueInt) == false)
{
indexValue = indexValueText;
}
else
{
indexValue = indexValueInt;
}
// read index close
if (reader.TryAdvance(out currentToken, skipWhitespace: true) == false) throw new FormatException("Expected ']', got end of string");
if (currentToken.TokenType != ObjectPathTokenType.IndexerClose) throw new FormatException("Expected ']', got '" + currentToken.Value + "' at " + currentToken.Position);
IndexerPathElement el = new IndexerPathElement(indexValue);
pathElements.Add(el);
if (reader.TryAdvance(out currentToken, skipWhitespace: true))
{
if (currentToken.TokenType != ObjectPathTokenType.NavigationElement) throw new FormatException("Expected '.', got '" + currentToken.Value + "' at " + currentToken.Position);
if (reader.CanAdvance(skipWhitespace: true) == false) throw new FormatException("Expected property, got end of string");
lastTokenWasNavigation = true;
}
}
else
{
throw new ArgumentException("Unexpected token '" + currentToken.Value + "' at " + currentToken.Position);
}
}
else if(currentToken.TokenType == ObjectPathTokenType.Identifier)
{
PropertyPathElement el = new PropertyPathElement(currentToken.Value);
pathElements.Add(el);
}
else if(currentToken.TokenType == ObjectPathTokenType.NavigationElement)
{
// do nothing
}
else
{
throw new ArgumentException("Unexpected token '" + currentToken.Value + "' at " + currentToken.Position);
}
}
return new ObjectPathExpression(pathElements);
}
/// <summary>
/// Creates a table expression from the given document info.
/// </summary>
/// <param name="context">The context that contains information about the document being rendered</param>
/// <returns>The created document expression</returns>
public IDocumentExpression CreateExpression(DocumentExpressionContext context)
{
if (context.Body.Count > 0)
{
throw new DocumentRenderException("table tags can't have a body", context.ReplacementKeyToken);
}
TokenReader<DocumentToken> reader = new TokenReader<DocumentToken>(context.Parameters);
DocumentToken variableExpressionToken;
if (reader.TryAdvance(out variableExpressionToken, skipWhitespace: true) == false)
{
throw new DocumentRenderException("missing collection expression after table tag", context.ReplacementKeyToken);
}
List<DocumentToken> columns = new List<DocumentToken>();
bool showDefaults = true;
bool showPossibilities = true;
while(reader.CanAdvance(skipWhitespace: true))
{
var nextToken = reader.Advance(skipWhitespace: true);
if (nextToken.Value == "-HideDefaults")
{
showDefaults = false;
}
else if(nextToken.Value == "-HideEnumValues")
{
showPossibilities = false;
}
else
{
columns.Add(nextToken);
}
}
if (columns.Count == 0)
{
throw new DocumentRenderException("table elements need to have at least one column parameter", context.ReplacementKeyToken);
}
return new TableExpression(variableExpressionToken, columns, context) { ShowDefaultValuesForArguments = showDefaults, ShowPossibleValuesForArguments = showPossibilities };
}
