Add escaping of semicolon and equals in node tags.

[rails.git] / lib / tags.rb

diff --git a/lib/tags.rb b/lib/tags.rb
new file mode 100644 (file)
index 0000000..2095b09
--- /dev/null
+++ b/lib/tags.rb
@@ -0,0 +1,42 @@
+module Tags
+  def self.join(tags)
+    joined = tags.collect { |k,v| "#{escape_string(k)}=#{escape_string(v)}" }.join(';')
+    joined = '' if joined.nil?
+    return joined
+  end
+
+  def self.escape_string(tag)
+    return tag.gsub(/[;=\\]/) { |v| escape_char(v) }
+  end
+
+  def self.escape_char(v)
+    case v
+      when ';' then return '\\s'
+      when '=' then return '\\e'
+    end
+    return '\\\\'
+  end
+
+  def self.split(tags)
+    tags.split(';').each do |tag|
+      key,val = tag.split('=').collect { |s| s.strip }
+      key = '' if key.nil?
+      val = '' if val.nil?
+      if key != '' && val != ''
+        yield unescape_string(key),unescape_string(val)
+      end
+    end
+  end
+
+  def self.unescape_string(tag)
+    return tag.gsub(/\\[se\\]/) { |v| unescape_char(v) }
+  end
+
+  def self.unescape_char(v)
+    case v
+      when '\\s' then return ';'
+      when '\\e' then return '='
+    end
+    return '\\'
+  end
+end