Function interpolation

static/editor.md/lib/codemirror/mode/jade/jade.js:155–161

(stream, state)

  }

  function interpolation(stream, state) {
    if (stream.match('#{')) {
      state.isInterpolating = true;
      state.interpolationNesting = 0;
      return 'punctuation';
    }
  }

  function interpolationContinued(stream, state) {
    if (state.isInterpolating) {