TapDigit is a simple JavaScript implementation of a math expression lexer, parser, and evaluator.
TapDigit.Lexer splits a math expression into a sequence of tokens. This is useful for e.g. an expression editor with color syntax highlighting.
TapDigit.Parser parses an expression and produces the JSON-formatted syntax tree representation thereof.
TapDigit.Evaluator computes the result of an expression. Variables, constants, and functions supported in the expression syntax can be extended via TapDigit.Context object.
There is also a simple web page (open demo/index.html) which demonstrates how it works.
- TapDigit was originally created by @AriyaHidayat.
- This fork of TapDigit has been migrated to TypeScript/ES6.
- Available under the BSD 3 Clause License.