Simple example of boolean expressions evaluation written in C++ using Bison. I compiled this program on Win7 using Cygwin and a separate download of Bison.

make % to build the example

calc++ examples.txt % to run the example and evaluate the content of a file

Supports:

• simple language to check expressions and print a symbol and error code in case they are not verified
• expressions
  • can access variables (usage of predefined string values)
  • simple string comparisons with string literals or variables
  • boolean operators with integer expressions
  • function calls (usage of predefined functions accepting one integer parameter)

Todo

• remove double quotes from string literals
• support predefined functions with variable argument list
• support date helpers (maybe just a predefined function)
• support regexp match operator (maybe just a predefined function)
• test Jison, the generation of a Javascript parser and grammar generalisation