Module: Omml2Mathml

Defined in:
lib/omml2mathml.rb,
lib/omml2mathml/convert.rb,
lib/omml2mathml/version.rb

Constant Summary collapse

VERSION = 
"0.0.12".freeze

Class Method Summary collapse

Class Method Details

.convert(filename) ⇒ Object 



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# File 'lib/omml2mathml/convert.rb', line 6

def convert(filename)
  @tags = %w{
    acc
    accPr
    aln
    alnScr
    argPr
    argSz
    bar
    barPr
    baseJc
    begChr
    borderBox
    borderBoxPr
    box
    boxPr
    brk
    brkBin
    brkBinSub
    cGp
    cGpRule
    chr
    count
    cSp
    ctrlPr
    d
    defJc
    deg
    degHide
    den
    diff
    dispDef
    dPr
    e
    endChr
    eqArr
    eqArrPr
    f
    fName
    fPr
    func
    funcPr
    groupChr
    groupChrPr
    grow
    hideBot
    hideLeft
    hideRight
    hideTop
    interSp
    intLim
    intraSp
    jc
    lim
    limLoc
    limLow
    limLowPr
    limUpp
    limUppPr
    lit
    lMargin
    m
    mathFont
    mathPr
    maxDist
    mc
    mcJc
    mcPr
    mcs
    mPr
    mr
    nary
    naryLim
    naryPr
    noBreak
    nor
    num
    objDist
    oMath
    oMathPara
    oMathParaPr
    opEmu
    phant
    phantPr
    plcHide
    pos
    postSp
    preSp
    r
    rad
    radPr
    rMargin
    rPr
    rSp
    rSpRule
    scr
    sepChr
    show
    shp
    smallFrac
    sPre
    sPrePr
    sSub
    sSubPr
    sSubSup
    sSubSupPr
    sSup
    sSupPr
    strikeBLTR
    strikeH
    strikeTLBR
    strikeV
    sty
    sub
    subHide
    sup
    supHide
    t
    transp
    type
    vertJc
    wrapIndent
    wrapRight
    zeroAsc
    zeroDesc
    zeroWid
  }

  @mathml = {}
  @tags.each do |t|
    @mathml["m_#{t.downcase}"] = t
  end

  html = Nokogiri::HTML.parse(File.read(filename, encoding: "utf-8")
                              .gsub(/\r/, "").gsub(/<m:/, "<m_")
                              .gsub(/<\/m:/, "</m_")
    .gsub(/<!\[endif\]>/, "<!--endif-->")
    .gsub(/<!\[endif\]-->/, "<!--endif-- -->")
                              .gsub(/<!\[if !msEquation\]>/,
                                    "<!--if !msEquation-->"))
  @xslt = Nokogiri::XSLT(File.open(
                           File.join(File.dirname(__FILE__),
                                     "xhtml-mathml.xsl"), "rb"
                         ))
  html.traverse do |n|
    if n.comment?
      if /^\[if gte msEquation 12\]>/.match? n.text
        n.replace(n.text.sub(/\[if gte msEquation 12\]>/, "")
                  .sub(/<!--endif-->/, ""))
      elsif /^if !msEquation/.match? n.text
        n.next.remove
        n.remove
      else
        n.remove
      end
    end
  end
  xml = Nokogiri::XML(html.to_xhtml)
  ns = xml.root.add_namespace "m", "http://schemas.microsoft.com/office/2004/12/omml"
  xml.traverse do |t|
    if t.element? && @mathml.has_key?(t.name)
      t.name = @mathml[t.name]
      t.namespace = ns
    end
  end
  # xml.xpath("//xmlns:link | //xmlns:style | //*[@class = 'MsoToc1'] | //*[@class = 'MsoToc2'] |//*[@class = 'MsoToc3'] |//*[@class = 'MsoToc4'] |//*[@class = 'MsoToc5'] |//*[@class = 'MsoToc6'] |//*[@class = 'MsoToc7'] |//*[@class = 'MsoToc8'] |//*[@class = 'MsoToc9'] ").each { |x| x.remove }
  xml.xpath("//*[local-name()='oMath' or local-name()='oMathPara']").each do |x|
    # prepare input: delete xmlns & change
    input = Nokogiri::XML(x.to_xml.sub(/<m:(oMath|oMathPara)>/,
                                       "<m:\\1 xmlns:m='http://schemas.openxmlformats.org/officeDocument/2006/math'>"))
    out = @xslt.transform(input)
    mml = out.to_xml.gsub(/<\?xml[^>]+>/, "")
      .gsub(%r{<([^:/! >]+ xmlns="http://www.w3.org/1998/Math/MathML")},
            "<mml:\\1")
      .gsub(%r{<([^:/!>]+)>}, "<mml:\\1>")
      .gsub(%r{</([^:/!>]+)>}, "</mml:\\1>")
      .gsub(%r{ xmlns="http://www.w3.org/1998/Math/MathML"}, "")
      .gsub(%r{ xmlns:mml="http://www.w3.org/1998/Math/MathML"}, "")
      .gsub(%r{ xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"}, "")
      .gsub(%r{ xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"}, "")
    x.replace("<mml:math>#{mml}</mml:math>")
  end
  xml.to_s
end