==========================================
parses ternary expressions
==========================================
print(isDone() ? stuff : otherStuff);
---
(program (expression_statement
    (function_call
        (identifier)
        (ternary (function_call (identifier)) (identifier) (identifier)))))

==========================================
parses mathematical operators
==========================================
a + b * c - d / e
---
(program (expression_statement
    (math_op
        (identifier)
        (math_op
            (math_op (identifier) (identifier))
            (math_op (identifier) (identifier))))))