REGEX type support.

README

@@ -52,18 +52,11 @@ type
 
 = To Do
 
-* Support more types: REGEX, etc.
-
-* Study src/main/ed/db/{dbcollection,dbcursor,db}.js in the Babble code.
-  That's what I should be writing to.
-
 * Capped collection support.
 
 * More code comments. More text in this file.
 
-* Rake task for rdoc generation.
-
-* Remove default _id generation.
+* Support more types: REF, SYMBOL, CODE_W_SCOPE, etc.
 
 * Introduce optional per-database and per-collection PKInjector.
 
@@ -73,7 +66,8 @@ type
 
 * Implement Admin.
 
-* See FIXME in db test.
+* Study src/main/ed/db/{dbcollection,dbcursor,db}.js and ByteEncoder.java in
+  the Babble code. That's what I should be writing to.
 
 
 = Credits

lib/mongo/util/bson.rb

@@ -59,6 +59,8 @@ class BSON
         serialize_oid_element(@buf, k, v)
       when ARRAY
         serialize_array_element(@buf, k, v)
+      when REGEX
+        serialize_regex_element(@buf, k, v)
       when BOOLEAN
         serialize_boolean_element(@buf, k, v)
       when DATE
@@ -97,6 +99,9 @@ class BSON
       when ARRAY
         key = deserialize_element_name(@buf)
         doc[key] = deserialize_array_data(@buf)
+      when REGEX
+        key = deserialize_element_name(@buf)
+        doc[key] = deserialize_regex_data(@buf)
       when OBJECT
         key = deserialize_element_name(@buf)
         doc[key] = deserialize_object_data(@buf)
@@ -162,6 +167,16 @@ class BSON
     a
   end
 
+  def deserialize_regex_data(buf)
+    str = deserialize_element_name(buf)
+    options_str = deserialize_element_name(buf)
+    options = 0
+    options |= Regexp::IGNORECASE if options_str.include?('i')
+    options |= Regexp::MULTILINE if options_str.include?('m')
+    options |= Regexp::EXTENDED if options_str.include?('x')
+    Regexp.new(str, options)
+  end
+
   def deserialize_string_data(buf)
     len = buf.get_int
     bytes = buf.get(len)
@@ -220,6 +235,21 @@ class BSON
     serialize_object_element(buf, key, h, ARRAY)
   end
 
+  def serialize_regex_element(buf, key, val)
+    buf.put(REGEX)
+    self.class.serialize_cstr(buf, key)
+
+    str = val.to_s.sub(/.*?:/, '')[0..-2] # Turn "(?xxx:yyy)" into "yyy"
+    self.class.serialize_cstr(buf, str)
+
+    options = val.options
+    options_str = ''
+    options_str << 'i' if ((options & Regexp::IGNORECASE) != 0)
+    options_str << 'm' if ((options & Regexp::MULTILINE) != 0)
+    options_str << 'x' if ((options & Regexp::EXTENDED) != 0)
+    self.class.serialize_cstr(buf, options_str)
+  end
+
   def serialize_oid_element(buf, key, val)
     buf.put(OID)
     self.class.serialize_cstr(buf, key)
@@ -274,6 +304,8 @@ class BSON
       key == "$where" ? CODE : STRING
     when Array
       ARRAY
+    when Regexp
+      REGEX
     when XGen::Mongo::Driver::ObjectID
       OID
     when true, false

tests/test_db_api.rb

@@ -101,4 +101,12 @@ class DBAPITest < Test::Unit::TestCase
     assert_equal 1, rows.length
     assert_equal [1, 2, 3], rows[0]['b']
   end
+
+  def test_regex
+    regex = /foobar/i
+    @coll << {'b' => regex}
+    rows = @coll.find({}, {'b' => 1}).collect
+    assert_equal 1, rows.length
+    assert_equal regex, rows[0]['b']
+  end
 end