diff options
Diffstat (limited to 'Xamarin.Forms.Xaml/TypeArgumentsParser.cs')
-rw-r--r-- | Xamarin.Forms.Xaml/TypeArgumentsParser.cs | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/Xamarin.Forms.Xaml/TypeArgumentsParser.cs b/Xamarin.Forms.Xaml/TypeArgumentsParser.cs new file mode 100644 index 00000000..59b2dd0a --- /dev/null +++ b/Xamarin.Forms.Xaml/TypeArgumentsParser.cs @@ -0,0 +1,54 @@ +using System.Collections.Generic; +using System.Xml; + +namespace Xamarin.Forms.Xaml +{ + internal static class TypeArgumentsParser + { + public static IList<XmlType> ParseExpression(string expression, IXmlNamespaceResolver resolver, IXmlLineInfo lineInfo) + { + var typeList = new List<XmlType>(); + while (!string.IsNullOrWhiteSpace(expression)) + { + var match = expression; + typeList.Add(Parse(match, ref expression, resolver, lineInfo)); + } + return typeList; + } + + static XmlType Parse(string match, ref string remaining, IXmlNamespaceResolver resolver, IXmlLineInfo lineinfo) + { + remaining = null; + int parensCount = 0; + int pos = 0; + bool isGeneric = false; + + for (pos = 0; pos < match.Length; pos++) + { + if (match[pos] == '(') + { + parensCount++; + isGeneric = true; + } + else if (match[pos] == ')') + parensCount--; + else if (match[pos] == ',' && parensCount == 0) + { + remaining = match.Substring(pos + 1); + break; + } + } + var type = match.Substring(0, pos).Trim(); + + IList<XmlType> typeArguments = null; + if (isGeneric) + { + typeArguments = ParseExpression( + type.Substring(type.IndexOf('(') + 1, type.LastIndexOf(')') - type.IndexOf('(') - 1), resolver, lineinfo); + type = type.Substring(0, type.IndexOf('(')); + } + var namespaceuri = type.Contains(":") ? resolver.LookupNamespace(type.Split(':')[0].Trim()) : ""; + return new XmlType(namespaceuri, type, typeArguments); + } + } +}
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