Link the prefixed wikidata-tags to wikidata.org

With this commit, the prefixed wikidata-tags get linked to the
corresponding wikidata.org-page in the current interface-language.

Multiple semicolon-separated wikidata-IDs are shown as multiple
semicolon-separated links to wikidata.

This commit contains also some tests for those links.

diff --git a/app/helpers/browse_helper.rb b/app/helpers/browse_helper.rb
index 494232744e3447feb079e31dd256db66fdf81413..096f74e2f42a17dd332a8e85190857a93a174aa6 100644 (file)
--- a/app/helpers/browse_helper.rb
+++ b/app/helpers/browse_helper.rb
@@ -69,8 +69,12 @@ module BrowseHelper
   def format_value(key, value)
     if wp = wikipedia_link(key, value)
       link_to h(wp[:title]), wp[:url], :title => t("browse.tag_details.wikipedia_link", :page => wp[:title])
-    elsif wdt = wikidata_link(key, value)
-      link_to h(wdt[:title]), wdt[:url], :title => t("browse.tag_details.wikidata_link", :page => wdt[:title])
+    elsif wdt = wikidata_links(key, value)
+      # IMPORTANT: Note that wikidata_links() returns an array of hashes, unlike for example wikipedia_link(),
+      # which just returns one such hash.
+      wdt.map{|w|
+        link_to(w[:title], w[:url], :title => t('browse.tag_details.wikidata_link', :page => w[:title].strip))
+      }.join(";").html_safe
     elsif url = wiki_link("tag", "#{key}=#{value}")
       link_to h(value), url, :title => t("browse.tag_details.wiki_link.tag", :key => key, :value => value)
     elsif url = telephone_link(key, value)
@@ -158,11 +162,22 @@ module BrowseHelper
     }
   end
 
-  def wikidata_link(key, value)
+  def wikidata_links(key, value)
+    # The simple wikidata-tag (this is limited to only one value)
     if key == "wikidata" && value =~ /^[Qq][1-9][0-9]*$/
-      return {
+      return [{
         :url => "//www.wikidata.org/wiki/#{value}?uselang=#{I18n.locale}",
         :title => value
+      }]
+    elsif (
+      # Key has to be one of the accepted wikidata-tags
+      key =~ /(architect|artist|brand|operator|subject):wikidata/ &&
+      # Value has to be a semicolon-separated list of wikidata-IDs (whitespaces allowed before and after semicolons)
+      value =~ /^[Qq][1-9][0-9]*(\s*;\s*[Qq][1-9][0-9]*)*$/
+    )
+      # Splitting at every semicolon to get a separate hash for each wikidata-ID
+      return value.split(";").map { |id|
+        id = {:title => id, :url => "//www.wikidata.org/wiki/#{id.strip}?uselang=#{I18n.locale}" }
       }
     end
     nil

diff --git a/test/helpers/browse_helper_test.rb b/test/helpers/browse_helper_test.rb
index e34af093083005f6643f95808809c8a637793b4d..19b2905162632036819a6ed1dc785d28a61b5d4a 100644 (file)
--- a/test/helpers/browse_helper_test.rb
+++ b/test/helpers/browse_helper_test.rb
@@ -146,31 +146,77 @@ class BrowseHelperTest < ActionView::TestCase
     assert_equal "http://wiki.openstreetmap.org/wiki/Tag:highway=primary?uselang=tr", link
   end
 
-  def test_wikidata_link
-    link = wikidata_link("foo", "Test")
-    assert_nil link
+  def test_wikidata_links
+    ### Non-prefixed wikidata-tag (only one value allowed)
 
-    link = wikidata_link("wikidata", "http://www.wikidata.org/wiki/Q1")
-    assert_nil link
+    links = wikidata_links("foo", "Test")
+    assert_nil links
 
-    link = wikidata_link("wikidata", "en:Q1")
-    assert_nil link
+    # No URLs allowed
+    links = wikidata_links("wikidata", "http://www.wikidata.org/wiki/Q1")
+    assert_nil links
 
-    link = wikidata_link("wikidata", "1")
-    assert_nil link
+    # No language-prefixes (as wikidata is multilanguage)
+    links = wikidata_links("wikidata", "en:Q1")
+    assert_nil links
 
-    link = wikidata_link("wikidata", "Q0123")
-    assert_nil link
+    # Needs a leading Q
+    links = wikidata_links("wikidata", "1")
+    assert_nil links
+
+    # No leading zeros allowed
+    links = wikidata_links("wikidata", "Q0123")
+    assert_nil links
 
-    link = wikidata_link("wikidata", "Q42")
-    assert_equal "//www.wikidata.org/wiki/Q42?uselang=en", link[:url]
-    assert_equal "Q42", link[:title]
+    # A valid value
+    links = wikidata_links("wikidata", "Q42")
+    assert_equal 1, links.length
+    assert_equal "//www.wikidata.org/wiki/Q42?uselang=en", links[0][:url]
+    assert_equal "Q42", links[0][:title]
 
+    # the language of the wikidata-page should match the current locale
     I18n.locale = "zh-CN"
+    links = wikidata_links("wikidata", "Q1234")
+    assert_equal 1, links.length
+    assert_equal "//www.wikidata.org/wiki/Q1234?uselang=zh-CN", links[0][:url]
+    assert_equal "Q1234", links[0][:title]
+    I18n.locale = "en"
+
+    ### Prefixed wikidata-tags
+
+    # Not anything is accepted as prefix (only limited set)
+    links = wikidata_links("anything:wikidata", "Q13")
+    assert_nil links
+
+    # This for example is an allowed key
+    links = wikidata_links("operator:wikidata", "Q24")
+    assert_equal "//www.wikidata.org/wiki/Q24?uselang=en", links[0][:url]
+    assert_equal "Q24", links[0][:title]
+
+    # another allowed key, this time with multiple values and I18n
+
+    I18n.locale = "dsb"
+    links = wikidata_links("brand:wikidata", "Q936;Q2013;Q1568346")
+    assert_equal 3, links.length
+    assert_equal "//www.wikidata.org/wiki/Q936?uselang=dsb", links[0][:url]
+    assert_equal "Q936", links[0][:title]
+    assert_equal "//www.wikidata.org/wiki/Q2013?uselang=dsb", links[1][:url]
+    assert_equal "Q2013", links[1][:title]
+    assert_equal "//www.wikidata.org/wiki/Q1568346?uselang=dsb", links[2][:url]
+    assert_equal "Q1568346", links[2][:title]
+    I18n.locale = "en"
 
-    link = wikidata_link("wikidata", "Q1234")
-    assert_equal "//www.wikidata.org/wiki/Q1234?uselang=zh-CN", link[:url]
-    assert_equal "Q1234", link[:title]
+    # and now with whitespaces…
+    links = wikidata_links("subject:wikidata", "Q6542248 ;\tQ180\n ;\rQ364\t\n\r ;\nQ4006")
+    assert_equal 4, links.length
+    assert_equal "//www.wikidata.org/wiki/Q6542248?uselang=en", links[0][:url]
+    assert_equal "Q6542248 ", links[0][:title]
+    assert_equal "//www.wikidata.org/wiki/Q180?uselang=en", links[1][:url]
+    assert_equal "\tQ180\n ", links[1][:title]
+    assert_equal "//www.wikidata.org/wiki/Q364?uselang=en", links[2][:url]
+    assert_equal "\rQ364\t\n\r ", links[2][:title]
+    assert_equal "//www.wikidata.org/wiki/Q4006?uselang=en", links[3][:url]
+    assert_equal "\nQ4006", links[3][:title]
   end
 
   def test_wikipedia_link