Excel Formula Parsing
My original Javascript version
Robin Macharg's Python version (raw source code)
Maarten Balliauw's PHP version
Lishen's C++ version on GitHub
Delphi XE port by Hartmut David
Related links:
A quick update regarding a bug fix to the original logic and Matt Brown's use of the logic in Rico 2.0.
Rob van Gelder's parser in VBA as an Excel add-in for "beautifying" formulas.