step3-evaluate.js

// 1. Parser Class & Export
class TcParser extends require("caffeine-eight").Parser {
  getStore() {
    return this.store || (this.store = []);
  }
}
module.exports = TcParser;

// 2. Root Rules
TcParser.rule("root", "expression", {
  evaluate() {
    return this.expression.evaluate();
  },
});

// 3. Arithmetic Rules
TcParser.rule("expression", "operand _? operator:/<=|>=|==|!=|[-+*\\/<>]/ _? operand", {
  evaluate() {
    return eval(`(a, b) => a ${this.operator.text} b`)(this.operands[0].evaluate(), this.operands[1].evaluate());
  },
});
TcParser.rule("expression", "operand", {
  evaluate() {
    return this.operand.evaluate();
  },
});
TcParser.rule("operand", "'(' _? root _? ')'", {
  evaluate() {
    return this.root.evaluate();
  },
});
TcParser.rule("operand", /-?[0-9]+/, {
  evaluate() {
    return eval(this.text);
  },
});
TcParser.rule("_", /\s+/);

//   3c. ADD SEQUENCES
// 4. Memory Rules
// 5. While Rules
//   5a. TURING COMPLETE!
// 6. If Rules
// 7. Variable Rules

TcParser.repl();