Many optimizations and new syntax files

syntax_files/dot.yaml

@@ -0,0 +1,28 @@
+filetype: dot
+
+detect:
+    filename: "\\.(dot|gv)$"
+
+rules:
+    - type:   "\\b(digraph|edge|graph|node|subgraph)\\b"
+    - statement: "\\b(arrow(head|size|tail)|(bg|fill|font)?color|center|constraint|decorateP|dir|distortion|font(name|size)|head(clip|label)|height|label(angle|distance|font(color|name|size))?|layer(s)?|margin|mclimit|minlen|name|nodesep|nslimit|ordering|orientation|page(dir)?|peripheries|port_label_distance|rank(dir|sep)?|ratio|regular|rotate|same(head|tail)|shape(file)?|sides|size|skew|style|tail(clip|label)|URL|weight|width)\\b"
+    - symbol:  "=|->|--"
+
+    - constant.string:
+        start: "\""
+        end: "(?<!\\\\)\""
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - comment:
+        start: "//"
+        end: "$"
+        rules:
+            - todo: "(TODO|XXX|FIXME):?"
+
+    - comment:
+        start: "/\\*"
+        end: "\\*/"
+        rules:
+            - todo: "(TODO|XXX|FIXME):?"
+