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hyphenrf's solution

to Bob in the OCaml Track

Published at May 02 2020 · 0 comments
Instructions
Test suite
Solution

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

Bob answers 'Sure.' if you ask him a question, such as "How are you?".

He answers 'Whoa, chill out!' if you YELL AT HIM (in all capitals).

He answers 'Calm down, I know what I'm doing!' if you yell a question at him.

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

He answers 'Whatever.' to anything else.

Bob's conversational partner is a purist when it comes to written communication and always follows normal rules regarding sentence punctuation in English.

Getting Started

  1. Install the Exercism CLI.

  2. Install OCaml.

  3. For library documentation, follow Useful OCaml resources.

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make

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Source

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

test.ml

open OUnit2
open Bob

let ae exp got _test_ctxt = assert_equal ~printer:(fun x -> x) exp got

let tests = [
  "stating something" >::
  ae "Whatever." (response_for "Tom-ay-to, tom-aaaah-to.");
  "shouting" >::
  ae "Whoa, chill out!" (response_for "WATCH OUT!");
  "shouting gibberish" >::
  ae "Whoa, chill out!" (response_for "FCECDFCAAB");
  "asking a question" >::
  ae "Sure." (response_for "Does this cryogenic chamber make me look fat?");
  "asking a numeric question" >::
  ae "Sure." (response_for "You are, what, like 15?");
  "asking gibberish" >::
  ae "Sure." (response_for "fffbbcbeab?");
  "talking forcefully" >::
  ae "Whatever." (response_for "Let's go make out behind the gym!");
  "using acronyms in regular speech" >::
  ae "Whatever." (response_for "It's OK if you don't want to go to the DMV.");
  "forceful question" >::
  ae "Calm down, I know what I'm doing!" (response_for "WHAT THE HELL WERE YOU THINKING?");
  "shouting numbers" >::
  ae "Whoa, chill out!" (response_for "1, 2, 3 GO!");
  "no letters" >::
  ae "Whatever." (response_for "1, 2, 3");
  "question with no letters" >::
  ae "Sure." (response_for "4?");
  "shouting with special characters" >::
  ae "Whoa, chill out!" (response_for "ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!");
  "shouting with no exclamation mark" >::
  ae "Whoa, chill out!" (response_for "I HATE THE DMV");
  "statement containing question mark" >::
  ae "Whatever." (response_for "Ending with ? means a question.");
  "non-letters with question" >::
  ae "Sure." (response_for ":) ?");
  "prattling on" >::
  ae "Sure." (response_for "Wait! Hang on. Are you going to be OK?");
  "silence" >::
  ae "Fine. Be that way!" (response_for "");
  "prolonged silence" >::
  ae "Fine. Be that way!" (response_for "          ");
  "alternate silence" >::
  ae "Fine. Be that way!" (response_for "\t\t\t\t\t\t\t\t\t\t");
  "multiple line question" >::
  ae "Whatever." (response_for "\nDoes this cryogenic chamber make me look fat?\nNo.");
  "starting with whitespace" >::
  ae "Whatever." (response_for "         hmmmmmmm...");
  "ending with whitespace" >::
  ae "Sure." (response_for "Okay if like my  spacebar  quite a bit?   ");
  "other whitespace" >::
  ae "Fine. Be that way!" (response_for "\n\r \t");
  "non-question ending with whitespace" >::
  ae "Whatever." (response_for "This is a statement ending with whitespace      ");
]

let () =
  run_test_tt_main ("bob tests" >::: tests)
let is_lower = function 'a'..'z' -> true | _ -> false
let is_upper = function 'A'..'Z' -> true | _ -> false

let rec string_any ?(i=0) (fn: char -> bool) str =
    if i = String.length str then false
    else fn str.[i] || string_any ~i:(i+1) fn str

let response_for s = match String.trim s with
  | "" -> "Fine. Be that way!"
  | cs ->
    let cs_length  = String.length cs         in
    let is_asking  = cs.[cs_length - 1] = '?' in
    let is_yelling =
        string_any is_upper cs && not (string_any is_lower cs)
    in
    match is_asking, is_yelling with
        | false,     false      -> "Whatever."
        | false,     true       -> "Whoa, chill out!"
        | true,      false      -> "Sure."
        | true,      true       -> "Calm down, I know what I'm doing!"

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