jupyterlab/src/editor/codemirror-ipython.ts

// IPython mode is just a slightly altered Python Mode with `?` beeing a extra
// single operator. Here we define `ipython` mode in the require `python`
// callback to auto-load python mode, which is more likely not the best things
// to do, but at least the simple one for now.
"use strict";

import * as CodeMirror
  from 'codemirror';

import "codemirror/mode/python/python";


CodeMirror.defineMode("ipython", (config: CodeMirror.EditorConfiguration, modeOptions: any) => {
    var pythonConf: any = {};
    for (var prop in modeOptions) {
      if (modeOptions.hasOwnProperty(prop)) {
        (pythonConf as any)[prop] = (modeOptions as any)[prop];
      }
    }
    pythonConf.name = 'python';
    pythonConf.singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!\\?]");
    if (pythonConf.version === 3) {
      pythonConf.identifiers = new RegExp("^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*");
    } else if (pythonConf.version === 2) {
      pythonConf.identifiers = new RegExp("^[_A-Za-z][_A-Za-z0-9]*");
    }
    return CodeMirror.getMode(config, pythonConf);
}, 'python');

CodeMirror.defineMIME("text/x-ipython", "ipython");