Invalid Callbacks

How to handle invalid callbacks?

Options

1. Current: Remove context completely
• Other valid contexts will still be evaluated
• - If no other contexts exist, file will always be loaded
• Not ideal behavior
2. Pass all callbacks to register method (whether valid or not
• Allow register method to determine how to handle invalid callbacks
• - Extra processing for file that should not be loaded
3. Remove callback and evaluate just context (string)
• - Callback is meant to be a condition of loading file
• Removal of callback will cause undesired loading of files
4. Track if no valid context exist for file (after parsing)
• Remove files with no valid contexts
• Files defined with empty contexts are allowed to pass
• Should always be loaded
• Use flag to track during parsing
• Example: $valid_context = false until valid context encountered
• If flag is false after all contexts evaluated, remove file
• ? Are there other conditions that should still allow file to load?
• e.g. callback property
• A: If contexts are set but all are invalid, global callback doesn’t matter
• Contexts & global callback are both evaluated when loading file