improved detection of alignment of node containing MathML expression: metanorma/metanorma-iso#1330

Author: opoudjis

lib/html2doc/math.rb

@@ -167,7 +167,8 @@ def mathml_to_ooml1(xml, docnamespaces)
     doc.root = ooxml_cleanup(xml, docnamespaces)
     # d = xml.parent["block"] != "false" # display_style
     ooxml = Nokogiri::XML(Plurimath::Math
-      .parse(doc.root.to_xml(indent: 0), :mathml).to_omml(split_on_linebreak: true))
+      .parse(doc.root.to_xml(indent: 0), :mathml)
+      .to_omml(split_on_linebreak: true))
     ooxml = unitalic(accent_tr(ooxml))
     ooxml = ooml_clean(uncenter(xml, ooxml))
     xml.swap(ooxml)
@@ -217,15 +218,20 @@ def uncenter(math, ooxml)
     alignnode = math.xpath(STYLE_BEARING_NODE).last
     ooxml.document? and ooxml = ooxml.root
     ret = uncenter_unneeded(math, ooxml, alignnode) and return ret
-    dir = "left"
-    alignnode["style"]&.include?("text-align:right") and dir = "right"
-    ooxml.name == "oMathPara" or
-      ooxml.wrap("<m:oMathPara></m:oMathPara>")
+    dir = ooxml_alignment(alignnode)
+    ooxml.name == "oMathPara" or ooxml.wrap("<m:oMathPara></m:oMathPara>")
     ooxml.elements.first.previous =
       "<m:oMathParaPr><m:jc m:val='#{dir}'/></m:oMathParaPr>"
     ooxml
   end
 
+  def ooxml_alignment(alignnode)
+    dir = "left"
+    /text-align:\s*right/.match?(alignnode["style"]) and dir = "right"
+    /text-align:\s*center/.match?(alignnode["style"]) and dir = "center"
+    dir
+  end
+
   def uncenter_unneeded(math, ooxml, alignnode)
     (math_block?(ooxml, math) || !alignnode) and return ooxml
     math_only_para?(alignnode) and return nil