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="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);
}
private static string ParseParameterValue(SimpleStringReader sr)
{
int ch;
var nameBuf = new StringBuilder();
while ((ch = sr.Peek()) != -1)
{
if (ch == ':' || ch == '}')
{
break;
}
if (ch == '\\')
{
// skip the backslash
sr.Read();
// append next character
nameBuf.Append((char) sr.Read());
continue;
}
nameBuf.Append((char) ch);
sr.Read();
}
return nameBuf.ToString();
}
private static string ParseParameterName(SimpleStringReader sr)
{
int ch;
var nestLevel = 0;
var nameBuf = new StringBuilder();
while ((ch = sr.Peek()) != -1)
{
if ((ch == '=' || ch == '}' || ch == ':') && nestLevel == 0)
{
break;
}
if (ch == '$')
{
sr.Read();
nameBuf.Append('$');
if (sr.Peek() == '{')
{
nameBuf.Append('{');
nestLevel++;
sr.Read();
}
continue;
}
if (ch == '}')
{
nestLevel--;
}
if (ch == '\\')
{
// skip the backslash
sr.Read();
// append next character
nameBuf.Append((char) sr.Read());
continue;
}
nameBuf.Append((char) ch);
sr.Read();
}
return nameBuf.ToString();
}
private static string ParseLayoutRendererName(SimpleStringReader sr)
{
int ch;
var nameBuf = new StringBuilder();
while ((ch = sr.Peek()) != -1)
{
if (ch == ':' || ch == '}')
{
break;
}
nameBuf.Append((char) ch);
sr.Read();
}
return nameBuf.ToString();
}
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;
}
/// <summary>
/// Initializes a new instance of the <see cref="ConditionTokenizer" /> class.
/// </summary>
/// <param name="stringReader">The string reader.</param>
public ConditionTokenizer(SimpleStringReader stringReader)
{
this.stringReader = stringReader;
TokenType = ConditionTokenType.BeginningOfInput;
GetNextToken();
}
