mirror of https://github.com/01-edu/public.git
removing deprecated functions
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@ -33,12 +33,7 @@ out the message **"Failed to parse todo"** in case it is a parsing error. Otherw
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**"Failed to read todo file"**.
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For the `Error` trait the following functions (methods) have to be implemented:
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- `description` which returns a string literal which says:
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- "Todo List parse failed: " for the `ParseErr`
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- "Todo List read failed: " for the `ReadErr`.
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- `cause` which returns an `Option` with the error:
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- `source` which returns an `Option` with the error:
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- For the `ReadErr` it must just return the option with the error
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- For the `ParseErr` it will return an option which can be `None` if the tasks are **empty** otherwise the error, if
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@ -53,7 +48,7 @@ Basically it must parse and read the JSON file and return the `TodoList` if ever
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### Notions
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- [Module std::fmt](https://doc.rust-lang.org/std/fmt/)
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- [Framework serde](https://serde.rs/)
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- [JSON](https://docs.rs/json/0.12.4/json/)
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- [Boxing errors](https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/boxing_errors.html)
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- [Returning Traits wirh dyn](https://doc.rust-lang.org/stable/rust-by-example/trait/dyn.html)
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@ -89,19 +84,13 @@ impl Display for ReadErr {
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}
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impl Error for ParseErr {
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fn description(&self) -> &str {
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}
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fn cause(&self) -> Option<&dyn Error> {
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fn source(&self) -> Option<&(dyn Error + 'static)> {
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}
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}
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impl Error for ReadErr {
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fn description(&self) -> &str {
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}
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fn cause(&self) -> Option<&dyn Error> {
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fn source(&self) -> Option<&(dyn Error + 'static)> {
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}
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}
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@ -113,17 +102,17 @@ for **lib.rs**
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mod error;
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use error::{ ParseErr, ReadErr };
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pub use json::{parse, stringify};
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pub use std::error::Error;
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pub use serde::{ Deserialize, Serialize };
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#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
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#[derive(Debug, Eq, PartialEq)]
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pub struct Task {
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id: u32,
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description: String,
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level: u32,
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}
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#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
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#[derive(Debug, Eq, PartialEq)]
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pub struct TodoList {
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title: String,
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tasks: Vec<Task>,
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@ -151,7 +140,7 @@ fn main() {
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match todos {
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Ok(list) => println!("{:?}", list),
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Err(e) => {
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println!("{}{:?}", e.description(), e.cause());
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println!("{}{:?}", e.to_string(), e.source());
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}
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}
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@ -159,7 +148,7 @@ fn main() {
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match todos {
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Ok(list) => println!("{:?}", list),
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Err(e) => {
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println!("{}{:?}", e.description(), e.cause());
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println!("{}{:?}", e.to_string(), e.source());
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}
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}
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@ -167,7 +156,7 @@ fn main() {
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match todos {
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Ok(list) => println!("{:?}", list),
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Err(e) => {
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println!("{}{:?}", e.description(), e.cause().unwrap());
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println!("{}{:?}", e.to_string(), e.source());
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}
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}
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}
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@ -179,6 +168,6 @@ And its output:
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student@ubuntu:~/[[ROOT]]/test$ cargo run
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TodoList { title: "TODO LIST FOR PISCINE RUST", tasks: [Task { id: 0, description: "do this", level: 0 }, Task { id: 1, description: "do that", level: 5 }] }
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Todo List parse failed: None
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Todo List parse failed: Malformed(Error("missing field `title`", line: 1, column: 2))
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Fail to parses todo Some(Malformed(UnexpectedCharacter { ch: ',', line: 2, column: 18 }))
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student@ubuntu:~/[[ROOT]]/test$
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```
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@ -1 +1,3 @@
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{}
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{
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"something": ,
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}
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