Redmine 3.4.4

lib/redmine/syntax_highlighting.rb

@@ -0,0 +1,93 @@
+# Redmine - project management software
+# Copyright (C) 2006-2017  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+module Redmine
+  module SyntaxHighlighting
+
+    class << self
+      attr_reader :highlighter
+
+      def highlighter=(name)
+        if name.is_a?(Module)
+          @highlighter = name
+        else
+          @highlighter = const_get(name)
+        end
+      end
+
+      def highlight_by_filename(text, filename)
+        highlighter.highlight_by_filename(text, filename)
+      rescue
+        ERB::Util.h(text)
+      end
+
+      def highlight_by_language(text, language)
+        highlighter.highlight_by_language(text, language)
+      rescue
+        ERB::Util.h(text)
+      end
+
+      def language_supported?(language)
+        if highlighter.respond_to? :language_supported?
+          highlighter.language_supported? language
+        else
+          true
+        end
+      rescue
+        false
+      end
+    end
+
+    module CodeRay
+      require 'coderay'
+
+      def self.retrieve_supported_languages
+        ::CodeRay::Scanners.list +
+        # Add CodeRay scanner aliases
+        ::CodeRay::Scanners.plugin_hash.keys.map(&:to_sym) -
+        # Remove internal CodeRay scanners
+        %w(debug default raydebug scanner).map(&:to_sym)
+      end
+      private_class_method :retrieve_supported_languages
+
+      SUPPORTED_LANGUAGES = retrieve_supported_languages
+
+      class << self
+        # Highlights +text+ as the content of +filename+
+        # Should not return line numbers nor outer pre tag
+        def highlight_by_filename(text, filename)
+          language = ::CodeRay::FileType[filename]
+          language ? ::CodeRay.scan(text, language).html(:break_lines => true) : ERB::Util.h(text)
+        end
+
+        # Highlights +text+ using +language+ syntax
+        # Should not return outer pre tag
+        def highlight_by_language(text, language)
+          ::CodeRay.scan(text, language).html(:wrap => :span)
+        end
+
+        def language_supported?(language)
+          SUPPORTED_LANGUAGES.include?(language.to_s.downcase.to_sym)
+        rescue
+          false
+        end
+      end
+    end
+  end
+
+  SyntaxHighlighting.highlighter = 'CodeRay'
+end