Attrs are patternable

With syndicate-nim f710419ead4c756261fdb67526936721a1c70a26.

.gitignore

@@ -1 +1,2 @@
 .tup
+test_patterns

src/svui.nim

@@ -1,13 +1,14 @@
 
 import
-  std/typetraits, preserves
+  std/typetraits, preserves, std/tables
 
 type
-  Svui* {.preservesRecord: "svui".} = object
+  Svui*[E] {.preservesRecord: "svui".} = ref object
+    `attrs`*: Table[string, Preserve[E]]
     `svg`*: string
 
-proc `$`*(x: Svui): string =
-  `$`(toPreserve(x))
+proc `$`*[E](x: Svui[E]): string =
+  `$`(toPreserve(x, E))
 
-proc encode*(x: Svui): seq[byte] =
-  encode(toPreserve(x))
+proc encode*[E](x: Svui[E]): seq[byte] =
+  encode(toPreserve(x, E))

svui.prs

@@ -1,3 +1,3 @@
 version 1.
 
-Svui = <svui @svg string>.
+Svui = <svui @attrs {symbol: any ...:...} @svg string>.

tests/test_patterns.nim

@@ -0,0 +1,11 @@
+import std/[typetraits, unittest]
+import preserves
+import syndicate/patterns
+import svui
+
+type Svui = svui.Svui[void]
+
+suite "patterns":
+  test "grab-all":
+    let pat = Svui ? {0: grab(), 1: grab()}
+    check $pat == "<compound <rec svui 2> {0: <bind <_>>, 1: <bind <_>>}>"