Module: MathML2AsciiMath

Defined in:
lib/mathml2asciimath/m2a.rb,
lib/mathml2asciimath/version.rb

Constant Summary collapse

VERSION = 
"0.0.7".freeze

Class Method Summary collapse

Class Method Details

.encodechars(x) ⇒ Object 



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# File 'lib/mathml2asciimath/m2a.rb', line 14

def self.encodechars(x)
  x.gsub(/\u03b1/, "\\alpha").
    gsub(/\u03b2/, "\\beta").
    gsub(/\u03b3/, "\\gamma").
    gsub(/\u0393/, "\\Gamma").
    gsub(/\u03b4/, "\\delta").
    gsub(/\u0394/, "\\Delta").
    gsub(/\u2206/, "\\Delta").
    gsub(/\u03b5/, "\\epsilon").
    gsub(/\u025b/, "\\varepsilon").
    gsub(/\u03b6/, "\\zeta").
    gsub(/\u03b7/, "\\eta").
    gsub(/\u03b8/, "\\theta").
    gsub(/\u0398/, "\\Theta").
    gsub(/\u03d1/, "\\vartheta").
    gsub(/\u03b9/, "\\iota").
    gsub(/\u03ba/, "\\kappa").
    gsub(/\u03bb/, "\\lambda").
    gsub(/\u039b/, "\\Lambda").
    gsub(/\u03bc/, "\\mu").
    gsub(/\u03bd/, "\\nu").
    gsub(/\u03be/, "\\xi").
    gsub(/\u039e/, "\\Xi").
    gsub(/\u03c0/, "\\pi").
    gsub(/\u03a0/, "\\Pi").
    gsub(/\u03c1/, "\\rho").
    gsub(/\u03c2/, "\\beta").
    gsub(/\u03c3/, "\\sigma").
    gsub(/\u03a3/, "\\Sigma").
    gsub(/\u03c4/, "\\tau").
    gsub(/\u03c5/, "\\upsilon").
    gsub(/\u03c6/, "\\phi").
    gsub(/\u03a6/, "\\Phi").
    gsub(/\u03d5/, "\\varphi").
    gsub(/\u03c7/, "\\chi").
    gsub(/\u03c8/, "\\psi").
    gsub(/\u03a8/, "\\Psi").
    gsub(/\u03c9/, "\\omega").
    gsub(/\u22c5/, "*").
    gsub(/\u2219/, "*").
    gsub(/\u00b7/, "*").
    gsub(/\u2217/, "**").
    gsub(/\u22c6/, "***").
    gsub(/\//, "//").
    gsub(/\\/, "\\\\").
    gsub(/\u00d7/, "xx").
    gsub(/\u22c9/, "|><").
    gsub(/\u22ca/, "><|").
    gsub(/\u22c8/, "|><|").
    gsub(/\u00f7/, "-:").
    gsub(/\u2218/, "@").
    gsub(/\u2295/, "o+").
    gsub(/\u2a01/, "o+").
    gsub(/\u2297/, "ox").
    gsub(/\u2299/, "o.").
    gsub(/\u2211/, "sum").
    gsub(/\u220f/, "prod").
    gsub(/\u2227/, "^^").
    gsub(/\u22c0/, "^^^").
    gsub(/\u2228/, "vv").
    gsub(/\u22c1/, "vvv").
    gsub(/\u2229/, "nn").
    gsub(/\u22c2/, "nnn").
    gsub(/\u222a/, "uu").
    gsub(/\u22c3/, "uuu").
    gsub(/\u2260/, "!=").
    gsub(/\u2264/, "<=").
    gsub(/\u2265/, ">=").
    gsub(/\u227a/, "-<").
    gsub(/\u227b/, ">-").
    gsub(/\u2aaf/, "-<=").
    gsub(/\u2ab0/, ">-=").
    gsub(/\u2208/, "in").
    gsub(/\u2209/, "!in").
    gsub(/\u2282/, "sub").
    gsub(/\u2283/, "sup").
    gsub(/\u2286/, "sube").
    gsub(/\u2287/, "supe").
    gsub(/\u2261/, "-=").
    gsub(/\u2245/, "~=").
    gsub(/\u2248/, "~~").
    gsub(/\u221d/, "prop").
    gsub(/\u00ac/, "not").
    gsub(/\u21d2/, "=>").
    gsub(/\u21d4/, "<=>").
    gsub(/\u2200/, "AA").
    gsub(/\u2203/, "EE").
    gsub(/\u22a5/, "_|_").
    gsub(/\u22a4/, "TT").
    gsub(/\u22a2/, "|--").
    gsub(/\u22a8/, "|==").
    gsub(/\u22a8/, "|==").
    gsub(/\u2329/, "(:").
    gsub(/\u232a/, ":)").
    gsub(/\u2329/, "<<").
    gsub(/\u27e8/, "<<").
    gsub(/\u232a/, ">>").
    gsub(/\u27e9/, ">>").
    gsub(/\u222e/, "oint").
    gsub(/\u2202/, "del").
    gsub(/\u2207/, "grad").
    gsub(/\u00b1/, "+-").
    gsub(/\u2205/, "O/").
    gsub(/\u221e/, "oo").
    gsub(/\u2135/, "aleph").
    gsub(/\u2234/, ":.").
    gsub(/\u2235/, ":'").
    gsub(/\u2220/, "/_").
    gsub(/\u25b3/, "/_\\").
    gsub(/\u2032/, "'").
    gsub(/~/, "tilde").
    gsub(/\u00a0\u00a0\u00a0\u00a0/, "qquad").
    gsub(/\u00a0\u00a0/, "quad").
    gsub(/\u00a0/, "\\ ").
    gsub(/\u2322/, "frown").
    gsub(/\u00a0/, "quad").
    gsub(/\u22ef/, "cdots").
    gsub(/\u22ee/, "vdots").
    gsub(/\u22f1/, "ddots").
    gsub(/\u22c4/, "diamond").
    gsub(/\u25a1/, "square").
    gsub(/\u230a/, "|__").
    gsub(/\u230b/, "__|").
    gsub(/\u2308/, "|~").
    gsub(/\u2309/, "~|").
    gsub(/\u2102/, "CC").
    gsub(/\u2115/, "NN").
    gsub(/\u211a/, "QQ").
    gsub(/\u211d/, "RR").
    gsub(/\u2124/, "ZZ").
    gsub(/\u2191/, "uarr").
    gsub(/\u2193/, "darr").
    gsub(/\u2190/, "larr").
    gsub(/\u2194/, "harr").
    gsub(/\u21d2/, "rArr").
    gsub(/\u21d0/, "lArr").
    gsub(/\u21d4/, "hArr").
    gsub(/\u2192/, "->").
    gsub(/\u21a3/, ">->").
    gsub(/\u21a0/, "->>").
    gsub(/\u2916/, ">->>").
    gsub(/\u21a6/, "|->").
    gsub(/\u2026/, "...").
    gsub(/\u2212/, "-").
    gsub(/\u2061/, ""). # function application
    gsub(/\u2751/, "square")
end

.m2a(x) ⇒ Object 



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# File 'lib/mathml2asciimath/m2a.rb', line 7

def self.m2a(x)
  docxml = Nokogiri::XML(x)
  parse(docxml.root).gsub(/  /, " ").
    sub(/^\s+/, "").
    sub(/\s+$/, "")
end

.parse(node) ⇒ Object 



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# File 'lib/mathml2asciimath/m2a.rb', line 162

def self.parse(node)
  out = ""
  if node.text?
    return encodechars(HTMLEntities.new.decode(node.text))
  else
    case node.name
    when "math"
      node.elements.each { |n| out << parse(n) }
      return out
    when "mrow"
      outarr = []
      node.children.each { |n| outarr << parse(n) }
      out = outarr.join("")
      if %w{mfrac msub munder munderover}.include? node.parent.name
        out = "(#{out})"
      end
      return out
    when "mfenced"
      outarr = []
      open = node["open"] || "("
      close = node["close"] || ")"
      separator = "," # TODO currently ignore the supplied separators
      node.elements.each { |n| outarr << parse(n) }
      out = outarr.join(separator)
      return "#{open}#{out}#{close}"
    when "msqrt"
      node.children.each { |n| out << parse(n) }
      return "sqrt(#{out})"
    when "mfrac"
      return "(#{parse(node.elements[0])})/(#{parse(node.elements[1])})"
    when "msup"
      sup = parse(node.elements[1])
      sup = "(#{sup})" unless sup.length == 1
      op = parse(node.elements[0]).gsub(/ $/, "")
      return "#{op}^#{sup}"
    when "msub"
      sub = parse(node.elements[1])
      sub = "(#{sub})" unless sub.length == 1
      op = parse(node.elements[0]).gsub(/ $/, "")
      return "#{op}_#{sub}"
    when "munderover", "msubsup"
      sub = parse(node.elements[1])
      sub = "(#{sub})" unless sub.length == 1
      sup = parse(node.elements[2])
      sup = "(#{sup})" unless sup.length == 1
      op = parse(node.elements[0]).gsub(/ $/, "")
      return "#{op}_#{sub}^#{sup}"
    when "munder"
      elem1 = parse(node.elements[1]).sub(/^\s+/, "").sub(/\s+$/, "")
      accent = case elem1
               when "\u0332" then "ul"
               when "\u23df" then "ubrace"
               else
                 "underset"
               end
      if accent == "underset"
        return "underset(#{elem1})(#{parse(node.elements[0])})"
      else
        return "#{accent} #{parse(node.elements[0])}"
      end
    when "mover"
      elem1 = parse(node.elements[1]).sub(/^\s+/, "").sub(/\s+$/, "")
      accent = case elem1
               when "\u005e" then "hat"
               when "\u00af" then "bar"
               #when "\u2192" then "vec"
               when "->" then "vec"
               when "." then "dot"
               when ".." then "ddot"
               when "\u23de" then "obrace"
               else
                 "overset"
               end
      if accent == "overset"
        return "overset(#{elem1})(#{parse(node.elements[0])})"
      else
        return "#{accent} #{parse(node.elements[0])}"
      end
    when "mtable"
      rows = []
      node.elements.each { |n| rows << parse(n) }
      return "[#{rows.join(",")}]"
    when "mtr"
      cols = []
      node.elements.each { |n| cols << parse(n) }
      return "[#{cols.join(",")}]"
    when "mtd"
      node.elements.each { |n| out << parse(n) }
      return "#{out}"
    when "mn", "mtext"
      node.children.each { |n| out << parse(n) }
      return "#{out}"
    when "mi"
      # mi is not meant to have space around it, but Word is conflating operators and operands
      node.children.each { |n| out << parse(n) }
      out = " #{out} " if /[^a-zA-Z0-9',]|[a-z][a-z]/.match out
      return out
    when "mo"
      node.children.each { |n| out << parse(n) }
      out = " #{out} " unless node["fence"]
      return out
    when "mstyle"
      node.children.each { |n| out << parse(n) }
      return out
    else
      node.to_xml
    end
  end
end