mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.5 KiB
82 lines
2.5 KiB
4 years ago
|
## profanity filter
|
||
|
|
||
|
### Instructions
|
||
|
|
||
|
Sometimes it is more desirable to catch the failure of some parts of a program instead
|
||
|
of just calling panic.
|
||
|
|
||
|
For this exercise you will have to create a message blocker, where you must block the word `stupid`
|
||
|
|
||
|
You will have to create a structure called `Message`, this structure
|
||
|
must have the following elements:
|
||
|
|
||
|
- content: String
|
||
|
- user: String
|
||
|
- time_sent: String
|
||
|
|
||
|
The struct must also have a implementation of 2 functions associated to it:
|
||
|
|
||
|
- `new`, that initializes the structure
|
||
|
- `send_ms`, that only has its implementation type (**self**) as argument and returns an option.
|
||
|
This function must return `None` if the content of the message is either **empty** or contains the
|
||
|
word **stupid**. Otherwise it returns the content of the message.
|
||
|
|
||
|
You will have to create two more functions that aren't associated to any structure:
|
||
|
|
||
|
- `check_ms` that receives as parameters the reference to the structure `Message` and returns a tuple,
|
||
|
containing a `bool` and a `string`. This function will execute the function `send_ms` and if the result
|
||
|
of the option is `None` it should return (false, "ERROR: illegal"). Otherwise it returns `true` and the
|
||
|
content of the message sent.
|
||
|
- `date_format` that creates and formats the date and time that the message was sent, the format should
|
||
|
look like this: **Mon Oct 5 10:22:19 2020**
|
||
|
|
||
|
### Expected Function
|
||
|
|
||
|
```rust
|
||
|
pub struct Message {}
|
||
|
|
||
|
impl Message {
|
||
|
pub fn new(ms: String, u: String, t: String) -> Message {}
|
||
|
pub fn send_ms(&self) -> Option<&str> {}
|
||
|
}
|
||
|
|
||
|
pub fn check_ms(ms: &Message) -> (bool, &str) {}
|
||
|
pub fn format_date() -> String {}
|
||
|
```
|
||
|
|
||
|
### Usage
|
||
|
|
||
|
Here is a program to test your function
|
||
|
|
||
|
```rust
|
||
|
fn main() {
|
||
|
let m0 = Message::new("hello there".to_string(), "toby".to_string(), format_date());
|
||
|
println!("{:?}", check_ms(&m0));
|
||
|
|
||
|
let m1 = Message::new("".to_string(), "toby".to_string(), format_date());
|
||
|
println!("{:?}", check_ms(&m1));
|
||
|
|
||
|
let m2 = Message::new("you are stupid".to_string(), "toby".to_string(), format_date());
|
||
|
println!("{:?}", check_ms(&m2));
|
||
|
|
||
|
let m3 = Message::new("stupid".to_string(), "toby".to_string(), format_date());
|
||
|
println!("{:?}", check_ms(&m3));
|
||
|
}
|
||
|
```
|
||
|
|
||
|
And its output:
|
||
|
|
||
|
```console
|
||
|
student@ubuntu:~/[[ROOT]]/test$ cargo run
|
||
|
(true, "hello there")
|
||
|
(false, "ERROR: illegal")
|
||
|
(false, "ERROR: illegal")
|
||
|
(false, "ERROR: illegal")
|
||
|
student@ubuntu:~/[[ROOT]]/test$
|
||
|
```
|
||
|
|
||
|
### Notions
|
||
|
|
||
|
- https://docs.rs/chrono/0.4.19/chrono/
|
||
|
- https://doc.rust-lang.org/stable/book/ch06-01-defining-an-enum.html?highlight=option#the-option-enum-and-its-advantages-over-null-values
|