Path to examples is hardwired in JS code; code not robust in case of error

[kaby76]

• The JS browser code hardwires the path to the examples directory:

  • antlr4-lab/static/js/grammars-v4.js

    Line 38 in 711ef7d

    let fname = prefix + x + "/examples/" + found.example[0];

  • antlr4-lab/static/js/grammars-v4.js

    Line 88 in 711ef7d

    let url = prefix + y + "/examples/" + x;

• The client code tries to download the example input file. If there is a problem retrieving the example, the rest of the UI set-up fails, including setting up the start symbol, which occurs just after doing the download.

  antlr4-lab/static/js/grammars-v4.js

  Line 42 in 711ef7d

  $("#start").text(found.start);