Sample code for runtime compilation and loading of Yarn scripts in Yarn Spinner 1

RuntimeLoading.cs

class Demo : MonoBehaviour {

  public DialogueRunner dialogueRunner;

  private void LoadYarnFilesAndRun(string sourceFilesDirectoryPath)
  {
      Debug.Log($"Compiling and loading Yarn files in {sourceFilesDirectoryPath}");

      var yarnFiles = Directory.EnumerateFiles(sourceFilesDirectoryPath, "*.yarn")
          .Concat(Directory.EnumerateFiles(sourceFilesDirectoryPath, "*.yarn.txt"))
          .ToList();

      if (yarnFiles.Count() == 0) {
          Debug.LogWarning("No Yarn files exist in the directory.");
          return;
      }

      var allPrograms = new List<Program>();
      var allStringTables = new List<IDictionary<string, StringInfo>>();

      foreach (var filePath in yarnFiles) {
          var fileName = Path.GetFileNameWithoutExtension(filePath);
          var fileContents = File.ReadAllText(filePath);

          try {

              Compiler.CompileString(fileContents, fileName, out var newProgram, out var stringTable);

              allPrograms.Add(newProgram);
              allStringTables.Add(stringTable);
          } catch (Yarn.YarnException e) {
              Debug.Log($"Error parsing {fileName}:\n{e.Message}");
          }
      }

      var compiledProgram = Program.Combine(allPrograms.ToArray());

      dialogueRunner.Dialogue.AddProgram(compiledProgram);

      foreach (var stringTable in allStringTables) {
          dialogueRunner.AddStringTable(stringTable);
      }
  }
}