lib/standard: Added to_snake_case and to_camel_case to string.nit

Signed-off-by: Frédéric Vachon <fredvac@gmail.com>

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index eea52be..74ec7a2 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -640,6 +640,79 @@ abstract class String
        #
        #     assert "Hello World!".to_lower     == "hello world!"
        fun to_lower : SELFTYPE is abstract
+
+       # Takes a camel case `self` and converts it to snake case 
+       #
+       #     assert "randomMethodId".to_snake_case == "random_method_id"
+       #
+       # If `self` is upper, it is returned unchanged
+       #
+       #     assert "RANDOM_METHOD_ID".to_snake_case == "RANDOM_METHOD_ID"
+       #
+       # If the identifier is prefixed by an underscore, the underscore is ignored
+       #
+       #     assert "_privateField".to_snake_case == "_private_field"
+       fun to_snake_case: SELFTYPE
+       do
+               if self.is_upper then return self
+
+               var new_str = new FlatBuffer.with_capacity(self.length)
+               var is_first_char = true
+
+               for char in self.chars do
+                       if is_first_char then 
+                               new_str.add(char.to_lower)
+                               is_first_char = false
+                       else if char.is_upper then
+                               new_str.add('_')
+                               new_str.add(char.to_lower)
+                       else
+                               new_str.add(char)
+                       end
+               end
+               
+               return new_str.to_s
+       end
+
+       # Takes a snake case `self` and converts it to camel case 
+       #
+       #     assert "random_method_id".to_camel_case == "randomMethodId"
+       #
+       # If the identifier is prefixed by an underscore, the underscore is ignored
+       #
+       #     assert "_private_field".to_camel_case == "_privateField"
+       #
+       # If `self` is upper, it is returned unchanged
+       #
+       #     assert "RANDOM_ID".to_camel_case == "RANDOM_ID"
+       #
+       # If there are several consecutive underscores, they are considered as a single one
+       #
+       #     assert "random__method_id".to_camel_case == "randomMethodId"
+       fun to_camel_case: SELFTYPE
+       do
+               if self.is_upper then return self
+
+               var new_str = new FlatBuffer
+               var is_first_char = true
+               var follows_us = false
+
+               for char in self.chars do
+                       if is_first_char then
+                               new_str.add(char)
+                               is_first_char = false
+                       else if char == '_' then
+                               follows_us = true
+                       else if follows_us then
+                               new_str.add(char.to_upper)
+                               follows_us = false
+                       else
+                               new_str.add(char)
+                       end
+               end
+
+               return new_str.to_s
+       end
 end
 
 private class FlatSubstringsIter