Crystal REVS is the best context-sensitive editor there is.

Features:

- Create Flowchart from Source for a clear view of the code
- Verify correctness of function. Detect errors
- Use Flowcharts for quick Code-reviews
- View Flowcharts - level wise, optimal, loops, conditions, area wise.
- Code and Flowchart Synchronization when browsing
- Comment-based flowcharts for a wider audience.
- Export flowcharts to BMP/JPEG/VISIO formats.
- Code-only, Comment-only and Code+Comment flowcharts.
- Print large flowcharts on a single page.
- Code is Easy-to-read:
- Auto-Formatting of Code and Comments.
- Line up object-names in successive declarations.
- Line up assignment operators in assignments.
- Split and indent long expressions as per operator precedence
- Transform hard-to-read code into very readable code.
- Improved code readability. Detect errors easily

Other features:
- Editing and Formatting in Real Time
- Tokens and Comments Panel for easy code entry
- State Diagrams