Module: Kramdown::Converter::MathEngine::MathjaxNode

Defined in:
lib/kramdown/converter/math_engine/mathjaxnode.rb

Overview

Uses the mathjax-node library for converting math formulas to MathML.

Constant Summary collapse

AVAILABLE =

MathjaxNode is available if this constant is true.

RUBY_VERSION >= '1.9' && begin
  %x{node --version}[1..-2] >= '4.0'
rescue
  begin
    %x{nodejs --version}[1..-2] >= '4.0'
  rescue
    false
  end
end && begin
  npm = %x{npm --global --depth=1 list mathjax-node 2>&1}

  unless /mathjax-node@/ === npm.lines.drop(1).join("\n")
    npm = %x{npm --depth=1 list mathjax-node 2>&1}
  end

  T2MPATH = File.join(npm.lines.first.strip, "node_modules/mathjax-node/bin/tex2mml")
  /mathjax-node@/ === npm.lines.drop(1).join("\n") && File.exist?(T2MPATH)
rescue
  false
end

Class Method Summary collapse

Class Method Details

.call(converter, el, opts) ⇒ Object 



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# File 'lib/kramdown/converter/math_engine/mathjaxnode.rb', line 37

def self.call(converter, el, opts)
  type = el.options[:category]

  cmd = [T2MPATH]
  cmd << "--inline" unless type == :block
  cmd << "--semantics" if converter.options[:math_engine_opts][:semantics] == true
  cmd << "--notexhints" if converter.options[:math_engine_opts][:texhints] == false
  result = IO.popen(cmd << el.value).read.strip

  attr = el.attr.dup
  attr.delete('xmlns')
  attr.delete('display')
  result.insert("<math".length, converter.html_attributes(attr))

  (type == :block ? "#{' '*opts[:indent]}#{result}\n" : result)
end