render.rb in mathematical-0.4.2

- old
+ new

@@ -20,9 +20,17 @@
 
     def render(maths)
       raise(TypeError, "text must be a string!") unless maths.is_a? String
       raise(ArgumentError, "text must be in itex format (`$...$` or `$$...$$`)!") unless maths =~ /\A\${1,2}/
 
+      # seems to be a bug in itex@1.5.1 where the "Vertical spacing and page breaks in multiline display" (\\)
+      # do not work, and yield an "unknown character" error
+      maths.gsub!(/\\\\/, "\\\\\\\\")
+
+      # `{align}` *should* be valid, according to AMS-Latex, but it seems itex@1.5.1 does not like it.
+      maths.gsub!(/\\begin\{align\}/, "\\begin{aligned}")
+      maths.gsub!(/\\end\{align\}/, "\\end{aligned}")
+
       begin
         raise RuntimeError unless svg_hash = @processer.process(maths)
         svg_hash["svg"] = svg_hash["svg"][xml_header.length..-1] # remove starting <?xml...> tag
         svg_hash["svg"] = svg_to_base64(svg_hash["svg"]) if @config[:base64]
         svg_hash