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mbraak's solution

to Bob in the Scheme Track

Published at May 21 2019 · 0 comments
Instructions
Test suite
Solution

Note:

This exercise has changed since this solution was written.

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Bob answers 'Sure.' if you ask him a question.

He answers 'Whoa, chill out!' if you yell at him.

He says 'Fine. Be that way!' if you address him without actually saying anything.

He answers 'Whatever.' to anything else.

Source

Inspired by the 'Deaf Grandma' exercise in Chris Pine's Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=06

Submitting Incomplete Solutions

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bob-test.scm

;; Load SRFI-64 lightweight testing specification
(use-modules (srfi srfi-64))

;; Suppress log file output. To write logs, comment out the following line:
(module-define! (resolve-module '(srfi srfi-64)) 'test-log-to-file #f)

;; Require bob impl
(add-to-load-path (dirname (current-filename)))
(use-modules (bob))

;;; Begin test suite
(test-begin "bob-test")

(test-equal "responds-to-something"
            "Whatever."
            (response-for "To-may-to, tom-aaaah-to."))

(test-equal "responds-to-shouts"
            "Whoa, chill out!"
            (response-for "WATCH OUT!"))

(test-equal "responds-to-questions"
            "Sure."
            (response-for "Does this cryogenic chamber make me look fat?"))

(test-equal "responds-to-forceful-talking"
            "Whatever."
            (response-for "Let's go make out behind the gym!"))

(test-equal "responds-to-acronyms"
            "Whatever."
            (response-for "It's OK if you don't want to go to the DMV."))

(test-equal "responds-to-forceful-questions"
            "Whoa, chill out!"
            (response-for "WHAT THE HELL WERE YOU THINKING?"))

(test-equal "responds-to-shouting-with-special-characters"
            "Whoa, chill out!"
            (response-for "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!"))

(test-equal "responds to shouting numbers"
            "Whoa, chill out!"
            (response-for "1, 2 ,3, GO!"))

(test-equal "responds-to-shouting-wit-no-exclamation-mark"
            "Whoa, chill out!"
            (response-for "I HATE YOU"))

(test-equal "responds-to-statement-containing-question-mark"
            "Whatever."
            (response-for "Ending with ? means a question."))

(test-equal "responds-to-silence"
            "Fine. Be that way!"
            (response-for ""))

(test-equal "responds-to-prolonged-silence"
            "Fine. Be that way!"
            (response-for "     "))

(test-equal "responds-to-only-numbers"
            "Whatever."
            (response-for "1, 2, 3"))

(test-equal "responds-to-number-question"
            "Sure."
            (response-for "4?"))

(test-end "bob-test")
;;; End test suite
(define-module (bob)
  #:export (response-for))

(define (contains-alpha input)
  (string-any char-alphabetic? input))

(define (is-shouting input)
  (and
    (contains-alpha input)
    (string=?
      (string-upcase input)
      input)))

(define (is-question input)
  (string=?
    (string-take-right input 1)
    "?"))

(define (is-silence input)
  (string=?
    (string-trim input)
    ""))

(define (response-for input)
  (cond
    ((is-silence input) "Fine. Be that way!")
    ((is-shouting input) "Whoa, chill out!")
    ((is-question input) "Sure.")
    ("Whatever.")
  )
)

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