Arbitrary-precision Integer Calculator

• Lexer
• Pratt Parser
• Tree-walk interpreter

• Addition +
• Subtraction -
• Multiplication *
• Division /
• Powers (exp function)

• Expressions

   2 + 3 * 6 - (2 + 4)
   //returns 14
  

• Variables

   a = 2 + 3 * 6
   //a is now saved as 20
  

• Function definitions and invocations

   myFunction1(x,y,thirdVariable) = x * y + thirdVariable
   myFunction1(1,2,3)
   //returns 5
  

• help() - Display quick introduction and usage guide
• showVars() - List all currently declared variables and their values
• showFunctions() - Display all available standard library functions with documentation
• showMyFunctions() - List all user-defined functions
• lexerOutput(0|1) - Toggle lexer tokenization debug output
• parserOutput(0|1) - Toggle parser AST debug output

• execFile(filename) - Execute another file line by line
• save() - Persist current variables and functions to disk (loaded on next startup)
• clearSave() - Delete the persistent save file

• abs(x) - Return absolute value of x
• max(a, b)/min(a, b) - Return maximum/minimum of two values
• cmp(a, b) - Compare two values with descriptive output (e.g., "5 is bigger")
• sum(x, y, ...) - Calculate sum of any number of arguments
• prod(x, y, ...) - Calculate product of any number of arguments
• mod(a, b) - Return remainder of division a / b
• exp(base, exponent) - Exponentiation (alternative to ^ operator)
• cntDigits(x) - Count number of decimal digits in x

• inspect(value, [base]) - Display internal chunk-level representation of numbers (base 10 or 16)
  • Example: inspect(5000000) shows decimal chunk representation from default
  • Example: inspect(300, 16) shows hexadecimal chunk representation

• Stl grammar correction, using levenshtein distance

   mx(1,2)
   //Output will be:
   Evaluator error: "mx()" function not found
   Note: Did you mean max()?
  

• Function info lookup

   ?max()
   //displays info about max function
   //also works for user defined functions like f(x) = 2*x