Operation Types and SubTypes for OpenCalc

OperationTypes.js

//@flow
export const OperationType = Object.freeze({
  'Constant': 1,            // a constant value (e.g. 2, 5, pi)
  'Operation': 2,           // can be calculated based on inputs (e.g. cos, +, !)
  'Equals': 3,              // clears and evaluates the queue
  'Clear': 4,               // clears the queue
  'Parenthesis': 5,         // parenthesis
});

export const OperationSubType = Object.freeze({
  'Constant': 1,            // a constant value (e.g. 2, 5, pi)
  'UnaryOp': 2,             // single input to the right of it (e.g. sqrt, cos,log)
  'BackwardUnaryOp': 3,     // single input to the left of it (e.g. !, %)
  'BinaryOp': 4,            // two inputs to the left and right (e.g. +, -, /)
  'Equals': 5,              // clears and evaluates the queue
  'Clear': 6,               // clears the queue
  'ParenthesisClose': 7,    // closed parenthesis
  'ParenthesisOpen': 8,     // open parenthesis
});

export const OperationArgs = Object.freeze({
  'Cleared': 1,             // indicates queue has just been cleared 
  'PrintAlone': 2,          // displays in the evaluation even if alone; used for pi and e
  'PrintAsString': 3,       // displays as string in the display; used for pi and e
  'NotParseable': 4,        // constant cannot be parsed (e.g. if pi is followed by 1, 1 should not be appended to pi) 
  'AddParenthesis': 5,      // an open parenthesis operation should be added after; used for binary ops 
});