initial work on the 'filter'

lib/ruote/util/filter.rb

@@ -0,0 +1,55 @@
+#--
+# Copyright (c) 2005-2011, John Mettraux, jmettraux@gmail.com
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# Made in Japan.
+#++
+
+require 'ruote/util/misc'
+require 'ruote/util/lookup'
+
+
+module Ruote
+
+  def self.filter (filter, hash)
+
+    #hash = Ruote.fulldup(hash)
+    hash = Rufus::Json.dup(hash)
+      # since Yajl is faster than Marshal...
+
+    filter.each do |rule|
+
+      field = rule['field']
+      value = Ruote.lookup(hash, field)
+
+      if rule['remove']
+
+        Ruote.unset(hash, rule['field'])
+
+      elsif d = rule['default'] and value.nil?
+
+        Ruote.set(hash, rule['field'], Rufus::Json.dup(d))
+      end
+    end
+
+    hash
+  end
+end
+

test/unit/ut_22_filter.rb

@@ -0,0 +1,80 @@
+
+#
+# testing ruote
+#
+# Sun Jan 30 21:08:14 JST 2011
+#
+
+require File.join(File.dirname(__FILE__), '..', 'test_helper.rb')
+
+require_json
+require 'rufus/json'
+require 'ruote/util/filter'
+
+
+class UtFilterTest < Test::Unit::TestCase
+
+  def test_remove
+
+    assert_equal(
+      {},
+      Ruote.filter(
+        [
+          { 'field' => 'x', 'remove' => true }
+        ],
+        { 'x' => 'y' }))
+
+    assert_equal(
+      { 'x' => {} },
+      Ruote.filter(
+        [
+          { 'field' => 'x.y', 'remove' => true }
+        ],
+        { 'x' => { 'y' => 'z' } }))
+  end
+
+  def test_default
+
+    assert_equal(
+      { 'x' => 1 },
+      Ruote.filter(
+        [
+          { 'field' => 'x', 'default' => 1 }
+        ],
+        {}))
+
+    assert_equal(
+      { 'x' => 2 },
+      Ruote.filter(
+        [
+          { 'field' => 'x', 'default' => 1 }
+        ],
+        { 'x' => 2 }))
+
+    assert_equal(
+      { 'x' => { 'y' => 1 } },
+      Ruote.filter(
+        [
+          { 'field' => 'x.y', 'default' => 1 }
+        ],
+        { 'x' => {} }))
+
+    assert_equal(
+      { 'x' => { 'y' => 2 } },
+      Ruote.filter(
+        [
+          { 'field' => 'x.y', 'default' => 1 }
+        ],
+        { 'x' => { 'y' => 2 } }))
+
+    assert_equal(
+      { 'x' => { 'y' => 1 } },
+      Ruote.filter(
+        [
+          { 'field' => 'x', 'default' => {} },
+          { 'field' => 'x.y', 'default' => 1 }
+        ],
+        {}))
+  end
+end
+