From: Lucas Bajolet <r4pass@hotmail.com>
Date: Mon, 24 Mar 2014 16:00:34 +0000 (-0400)
Subject: stdlib/strings: Added reversed service on Text and subclasses.
X-Git-Tag: v0.6.5~7^2~3^2~5
X-Git-Url: http://nitlanguage.org

stdlib/strings: Added reversed service on Text and subclasses.

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

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index 75aba13..11dece3 100644
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -177,6 +177,9 @@ abstract class Text
 		return substring(from, length - from)
 	end
 
+	# Returns a reversed version of self
+	fun reversed: SELFTYPE is abstract
+
 	# Does self have a substring `str` starting from position `pos`?
 	#
 	#     assert "abcd".has_substring("bc",1)	     ==  true
@@ -629,6 +632,19 @@ class FlatString
 		return items[index + index_from]
 	end
 
+	redef fun reversed
+	do
+		var native = calloc_string(self.length + 1)
+		var reviter = chars.reverse_iterator
+		var pos = 0
+		while reviter.is_ok do
+			native[pos] = reviter.item
+			pos += 1
+			reviter.next
+		end
+		return native.to_s_with_length(self.length)
+	end
+
 	redef fun substring(from, count)
 	do
 		assert count >= 0
@@ -1113,6 +1129,17 @@ class FlatBuffer
 		end
 	end
 
+	redef fun reversed
+	do
+		var new_buf = new FlatBuffer.with_capacity(self.length)
+		var reviter = self.chars.reverse_iterator
+		while reviter.is_ok do
+			new_buf.add(reviter.item)
+			reviter.next
+		end
+		return new_buf
+	end
+
 	redef fun +(other)
 	do
 		var new_buf = new FlatBuffer.with_capacity(self.length + other.length)