use stringbuilder for shape expression parsing

diff --git a/Crow/src/Widgets/Shape.cs b/Crow/src/Widgets/Shape.cs
index 020b0a711d35bae37fe17a972862498a13350367..dd8fefdf71430bb1f3852bd514b871d93b595890 100644 (file)
--- a/Crow/src/Widgets/Shape.cs
+++ b/Crow/src/Widgets/Shape.cs
@@ -36,29 +36,31 @@ namespace Crow
        public class PathParser : StringReader
        {
                public PathParser (string str) : base (str) { }
-
+               char[] buffer = new char[20];
                double readDouble ()
                {
-                       StringBuilder tmp = new StringBuilder ();
+                       int length = 0;                 
 
                        while (Peek () >= 0) {
-                               char c = (char)Read ();
-                               if (c.IsWhiteSpaceOrNewLine ()) {
-                                       if (tmp.Length == 0)
+                               buffer[length] = (char)Read ();
+                               if (buffer[length].IsWhiteSpaceOrNewLine ()) {
+                                       if (length == 0)
                                                continue;
                                        else
                                                break;
-                               } else if (c == ',')
+                               } else if (buffer[length] == ',')
                                        break;
-                               tmp.Append (c);
+                               length++;
                        }
-                       return double.Parse (tmp.ToString ());
+                       return double.Parse (buffer.AsSpan(0, length));
                }
                public void Draw (Context gr, bool measure = false)
                {
+                       char c;
+
                        try {
                                while (Peek () >= 0) {
-                                       char c = (char)Read ();
+                                       c = (char)Read ();
                                        if (c.IsWhiteSpaceOrNewLine ())
                                                continue;
                                        switch (c) {