lib/standard/ropes: Adapted to_cstring for Ropes.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

diff --git a/lib/standard/ropes.nit b/lib/standard/ropes.nit
index f69b547..33d02ee 100644 (file)
--- a/lib/standard/ropes.nit
+++ b/lib/standard/ropes.nit
@@ -96,6 +96,9 @@ abstract class Rope
        # Root node, entry point of a Rope.
        private var root: RopeNode
 
+       # Cached version of self as a flat String
+       private var str_representation: nullable NativeString = null
+
        # Empty Rope
        init do from("")
 
@@ -123,6 +126,32 @@ abstract class Rope
        # Iterator on the substrings, starting at position `from`, in forward order
        fun substrings_from(from: Int): IndexedIterator[Text] do return new SubstringsIterator(self, from)
 
+       redef fun to_cstring
+       do
+               if str_representation != null then return str_representation.as(not null)
+
+               var native_final_str = calloc_string(length + 1)
+
+               native_final_str[length] = '\0'
+
+               if self.length == 0 then
+                       str_representation = native_final_str
+                       return native_final_str
+               end
+
+               var offset = 0
+
+               for i in substrings do
+                       var str = i.flatten
+                       if str isa FlatString then str.items.copy_to(native_final_str, str.length, str.index_from, offset)
+                       offset += i.length
+               end
+
+               str_representation = native_final_str
+
+               return native_final_str
+       end
+
        # Path to the Leaf for `position`
        private fun node_at(position: Int): Path
        do