internal static LayoutRenderer[] CompileLayout(ConfigurationItemFactory configurationItemFactory, SimpleStringReader sr, bool isNested, out string text)
{
var result = new List<LayoutRenderer>();
var literalBuf = new StringBuilder();
int ch;
var p0 = sr.Position;
while ((ch = sr.Peek()) != -1)
{
if (isNested && (ch == '}' || ch == ':'))
{
break;
}
sr.Read();
if (ch == '$' && sr.Peek() == '{')
{
if (literalBuf.Length > 0)
{
result.Add(new LiteralLayoutRenderer(literalBuf.ToString()));
literalBuf.Length = 0;
}
var newLayoutRenderer = ParseLayoutRenderer(configurationItemFactory, sr);
if (CanBeConvertedToLiteral(newLayoutRenderer))
{
newLayoutRenderer = ConvertToLiteral(newLayoutRenderer);
}
// layout renderer
result.Add(newLayoutRenderer);
}
else
{
literalBuf.Append((char) ch);
}
}
if (literalBuf.Length > 0)
{
result.Add(new LiteralLayoutRenderer(literalBuf.ToString()));
literalBuf.Length = 0;
}
var p1 = sr.Position;
MergeLiterals(result);
text = sr.Substring(p0, p1);
return result.ToArray();
}
/// <summary>
/// Parses the specified condition string and turns it into
/// <see cref="ConditionExpression" /> tree.
/// </summary>
/// <param name="expressionText">The expression to be parsed.</param>
/// <param name="configurationItemFactories">
/// Instance of <see cref="ConfigurationItemFactory" /> used to resolve references to condition methods and layout renderers.
/// </param>
/// <returns>The root of the expression syntax tree which can be used to get the value of the condition in a specified context.</returns>
public static ConditionExpression ParseExpression(string expressionText, ConfigurationItemFactory configurationItemFactories)
{
if (expressionText == null)
{
return null;
}
var parser = new ConditionParser(new SimpleStringReader(expressionText), configurationItemFactories);
var expression = parser.ParseExpression();
if (!parser.tokenizer.IsEOF())
{
throw new ConditionParseException("Unexpected token: " + parser.tokenizer.TokenValue);
}
return expression;
}
private static LayoutRenderer ApplyWrappers(ConfigurationItemFactory configurationItemFactory, LayoutRenderer lr, List<LayoutRenderer> orderedWrappers)
{
for (var i = orderedWrappers.Count - 1; i >= 0; --i)
{
var newRenderer = (WrapperLayoutRendererBase) orderedWrappers[i];
InternalLogger.Trace("Wrapping {0} with {1}", lr.GetType().Name, newRenderer.GetType().Name);
if (CanBeConvertedToLiteral(lr))
{
lr = ConvertToLiteral(lr);
}
newRenderer.Inner = new SimpleLayout(new[] {lr}, string.Empty, configurationItemFactory);
lr = newRenderer;
}
return lr;
}
/// <summary>
/// Parses the specified condition string and turns it into
/// <see cref="ConditionExpression" /> tree.
/// </summary>
/// <param name="stringReader">The string reader.</param>
/// <param name="configurationItemFactories">
/// Instance of <see cref="ConfigurationItemFactory" /> used to resolve references to condition methods and layout renderers.
/// </param>
/// <returns>
/// The root of the expression syntax tree which can be used to get the value of the condition in a specified context.
/// </returns>
internal static ConditionExpression ParseExpression(SimpleStringReader stringReader, ConfigurationItemFactory configurationItemFactories)
{
var parser = new ConditionParser(stringReader, configurationItemFactories);
var expression = parser.ParseExpression();
return expression;
}
/// <summary>
/// Initializes a new instance of the <see cref="ConditionParser" /> class.
/// </summary>
/// <param name="stringReader">The string reader.</param>
/// <param name="configurationItemFactory">
/// Instance of <see cref="ConfigurationItemFactory" /> used to resolve references to condition methods and layout renderers.
/// </param>
private ConditionParser(SimpleStringReader stringReader, ConfigurationItemFactory configurationItemFactory)
{
this.configurationItemFactory = configurationItemFactory;
tokenizer = new ConditionTokenizer(stringReader);
}
internal Factory(ConfigurationItemFactory parentFactory)
{
this.parentFactory = parentFactory;
}
internal SimpleLayout(LayoutRenderer[] renderers, string text, ConfigurationItemFactory configurationItemFactory)
{
this.configurationItemFactory = configurationItemFactory;
SetRenderers(renderers, text);
}
/// <summary>
/// Initializes a new instance of the <see cref="SimpleLayout" /> class.
/// </summary>
/// <param name="txt">The layout string to parse.</param>
/// <param name="configurationItemFactory">The NLog factories to use when creating references to layout renderers.</param>
public SimpleLayout(string txt, ConfigurationItemFactory configurationItemFactory)
{
this.configurationItemFactory = configurationItemFactory;
Text = txt;
}
/// <summary>
/// Builds the default configuration item factory.
/// </summary>
/// <returns>Default factory.</returns>
private static ConfigurationItemFactory BuildDefaultFactory()
{
var factory = new ConfigurationItemFactory(typeof (Logger).Assembly);
factory.RegisterExtendedItems();
return factory;
}
internal static void SetPropertyFromString(object o, string name, string value, ConfigurationItemFactory configurationItemFactory)
{
InternalLogger.Debug("Setting '{0}.{1}' to '{2}'", o.GetType().Name, name, value);
PropertyInfo propInfo;
if (!TryGetPropertyInfo(o, name, out propInfo))
{
throw new NotSupportedException("Parameter " + name + " not supported on " + o.GetType().Name);
}
try
{
if (propInfo.IsDefined(typeof (ArrayParameterAttribute), false))
{
throw new NotSupportedException("Parameter " + name + " of " + o.GetType().Name + " is an array and cannot be assigned a scalar value.");
}
object newValue;
var propertyType = propInfo.PropertyType;
propertyType = Nullable.GetUnderlyingType(propertyType) ?? propertyType;
if (!TryNLogSpecificConversion(propertyType, value, out newValue, configurationItemFactory))
{
if (!TryGetEnumValue(propertyType, value, out newValue))
{
if (!TryImplicitConversion(propertyType, value, out newValue))
{
if (!TrySpecialConversion(propertyType, value, out newValue))
{
newValue = Convert.ChangeType(value, propertyType, CultureInfo.InvariantCulture);
}
}
}
}
propInfo.SetValue(o, newValue, null);
}
catch (TargetInvocationException ex)
{
throw new NLogConfigurationException("Error when setting property '" + propInfo.Name + "' on " + o, ex.InnerException);
}
catch (Exception exception)
{
if (exception.MustBeRethrown())
{
throw;
}
throw new NLogConfigurationException("Error when setting property '" + propInfo.Name + "' on " + o, exception);
}
}
private static bool TryNLogSpecificConversion(Type propertyType, string value, out object newValue, ConfigurationItemFactory configurationItemFactory)
{
if (propertyType == typeof (Layout) || propertyType == typeof (SimpleLayout))
{
newValue = new SimpleLayout(value, configurationItemFactory);
return true;
}
if (propertyType == typeof (ConditionExpression))
{
newValue = ConditionParser.ParseExpression(value, configurationItemFactory);
return true;
}
newValue = null;
return false;
}
private static LayoutRenderer ParseLayoutRenderer(ConfigurationItemFactory configurationItemFactory, SimpleStringReader sr)
{
var ch = sr.Read();
Debug.Assert(ch == '{', "'{' expected in layout specification");
var name = ParseLayoutRendererName(sr);
var lr = configurationItemFactory.LayoutRenderers.CreateInstance(name);
var wrappers = new Dictionary<Type, LayoutRenderer>();
var orderedWrappers = new List<LayoutRenderer>();
ch = sr.Read();
while (ch != -1 && ch != '}')
{
var parameterName = ParseParameterName(sr).Trim();
if (sr.Peek() == '=')
{
sr.Read(); // skip the '='
PropertyInfo pi;
var parameterTarget = lr;
if (!PropertyHelper.TryGetPropertyInfo(lr, parameterName, out pi))
{
Type wrapperType;
if (configurationItemFactory.AmbientProperties.TryGetDefinition(parameterName, out wrapperType))
{
LayoutRenderer wrapperRenderer;
if (!wrappers.TryGetValue(wrapperType, out wrapperRenderer))
{
wrapperRenderer = configurationItemFactory.AmbientProperties.CreateInstance(parameterName);
wrappers[wrapperType] = wrapperRenderer;
orderedWrappers.Add(wrapperRenderer);
}
if (!PropertyHelper.TryGetPropertyInfo(wrapperRenderer, parameterName, out pi))
{
pi = null;
}
else
{
parameterTarget = wrapperRenderer;
}
}
}
if (pi == null)
{
ParseParameterValue(sr);
}
else
{
if (typeof (Layout).IsAssignableFrom(pi.PropertyType))
{
var nestedLayout = new SimpleLayout();
string txt;
var renderers = CompileLayout(configurationItemFactory, sr, true, out txt);
nestedLayout.SetRenderers(renderers, txt);
pi.SetValue(parameterTarget, nestedLayout, null);
}
else if (typeof (ConditionExpression).IsAssignableFrom(pi.PropertyType))
{
var conditionExpression = ConditionParser.ParseExpression(sr, configurationItemFactory);
pi.SetValue(parameterTarget, conditionExpression, null);
}
else
{
var value = ParseParameterValue(sr);
PropertyHelper.SetPropertyFromString(parameterTarget, parameterName, value, configurationItemFactory);
}
}
}
else
{
// what we've just read is not a parameterName, but a value
// assign it to a default property (denoted by empty string)
PropertyInfo pi;
if (PropertyHelper.TryGetPropertyInfo(lr, string.Empty, out pi))
{
if (typeof (SimpleLayout) == pi.PropertyType)
{
pi.SetValue(lr, new SimpleLayout(parameterName), null);
}
else
{
var value = parameterName;
PropertyHelper.SetPropertyFromString(lr, pi.Name, value, configurationItemFactory);
}
}
else
{
InternalLogger.Warn("{0} has no default property", lr.GetType().FullName);
}
}
ch = sr.Read();
}
lr = ApplyWrappers(configurationItemFactory, lr, orderedWrappers);
return lr;
}
