lib/sqlite3: intro `Text::to_sql_date_string`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/sqlite3/sqlite3.nit b/lib/sqlite3/sqlite3.nit
index 62fe8e5..31c585f 100644 (file)
--- a/lib/sqlite3/sqlite3.nit
+++ b/lib/sqlite3/sqlite3.nit
@@ -305,8 +305,9 @@ redef universal Int super Sqlite3Data end
 
 redef universal Float super Sqlite3Data end
 
-redef class String
-       super Sqlite3Data
+redef class String super Sqlite3Data end
+
+redef class Text
 
        # Return `self` between `'`s, escaping `\` and `'`
        #
@@ -315,6 +316,24 @@ redef class String
        do
                return "'{self.replace('\\', "\\\\").replace('\'', "''")}'"
        end
+
+       # Format the date represented by `self` into an escaped string for SQLite
+       #
+       # `self` must be composed of 1 to 3 integers separated by '-'.
+       # An incompatible format will result in an invalid date string.
+       #
+       #     assert "2016-5-1".to_sql_date_string == "'2016-05-01'"
+       #     assert "2016".to_sql_date_string == "'2016-01-01'"
+       fun to_sql_date_string: String
+       do
+               var parts = self.split("-")
+               for i in [parts.length .. 3[ do parts[i] = "1"
+
+               var year = parts[0].justify(4, 1.0, '0')
+               var month = parts[1].justify(2, 1.0, '0')
+               var day = parts[2].justify(2, 1.0, '0')
+               return "{year}-{month}-{day}".to_sql_string
+       end
 end
 
 # A Sqlite3 blob