Function switchState

static/editor.md/lib/codemirror/mode/haskell/haskell.js:16–19

(source, setState, f)

CodeMirror.defineMode("haskell", function(_config, modeConfig) {

  function switchState(source, setState, f) {
    setState(f);
    return f(source, setState);
  }

  // These should all be Unicode extended, as per the Haskell 2010 report
  var smallRE = /[a-z_]/;