Решение на CSV Filter от Кристиян Стоянов
Към профила на Кристиян Стоянов
Резултати
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- 0 бонус точки
- 0 точки общо
- 0 успешни тест(а)
- 0 неуспешни тест(а)
Код
#[derive(Debug)]
pub enum CsvError {
IO(std::io::Error),
ParseError(String),
InvalidHeader(String),
InvalidRow(String),
InvalidColumn(String),
}
pub fn skip_next(input: &str, target: char) -> Option<&str> {
let mut chars = input.chars();
if chars.next()==Some(target)
{
if chars.count()>0
{ return Some(input.chars().next().map(|c| &input[c.len_utf8()..]).unwrap());}
else{
return Some("");
}
}
else
{
return None;
}
}
pub fn take_until(input: &str, target: char) -> (&str, &str) {
let k:Vec<&str>=input.split(target).collect::<Vec<&str>>();
return (k[0],input.strip_prefix(k[0]).unwrap());
}
pub fn take_and_skip(input: &str, target: char) -> Option<(&str, &str)> {
let k:Vec<&str>=input.split(target).collect::<Vec<&str>>();
if k.len()<2
{
return None;
}
else
{
return Some((k[0], k[1]));
}
}
use std::collections::HashMap;
use std::io::BufReader;
use std::io::BufRead;
type Row= HashMap<String, String>;
pub struct Csv<R: BufRead> {
pub columns: Vec<String>,
reader: R,
selection: Option<Box<dyn Fn(&Row) -> Result<bool, CsvError>>>,
}
impl<R: BufRead> Csv<R> {
pub fn new(mut reader: R) -> Result<Self, CsvError> {
let mut O:String=String::new();
reader.read_line(&mut O);
if O.len()==0 {
return Err(CsvError::InvalidHeader("".to_string()));
}
let mut i=O.split(",").collect::<Vec<&str>>();
let mut k:Vec<String>=Vec::<String>::new();
for j in 0..i.len() {
i[j]=i[j].trim_start();
i[j]=i[j].trim_end();
for h in 0..k.len()
{
if k[h]==i[j] {
return Err(CsvError::InvalidHeader("".to_string()));
}
}
k.push(i[j].to_string());
}
return Ok( Csv{columns: k,reader: reader,selection:None });
}
}
Лог от изпълнението
Compiling solution v0.1.0 (/tmp/d20210111-1538662-1vfherq/solution)
warning: unused import: `std::io::BufReader`
--> src/lib.rs:47:5
|
47 | use std::io::BufReader;
| ^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
warning: field is never read: `reader`
--> src/lib.rs:55:5
|
55 | reader: R,
| ^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: field is never read: `selection`
--> src/lib.rs:56:5
|
56 | selection: Option<Box<dyn Fn(&Row) -> Result<bool, CsvError>>>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
warning: variable `O` should have a snake case name
--> src/lib.rs:62:17
|
62 | let mut O:String=String::new();
| ^ help: convert the identifier to snake case (notice the capitalization): `o`
|
= note: `#[warn(non_snake_case)]` on by default
warning: unused `std::result::Result` that must be used
--> src/lib.rs:63:9
|
63 | reader.read_line(&mut O);
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(unused_must_use)]` on by default
= note: this `Result` may be an `Err` variant, which should be handled
warning: 5 warnings emitted
error[E0599]: no method named `next` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:70:23
|
70 | let row = csv.next().unwrap().unwrap();
| ^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `next` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:76:21
|
76 | assert!(csv.next().is_none());
| ^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `map` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:195:34
|
195 | let filtered_names = csv.map(|row| row.unwrap()["name"].clone()).collect::<Vec<_>>();
| ^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
|
::: /tmp/d20210111-1538662-1vfherq/solution/src/lib.rs:53:1
|
53 | pub struct Csv<R: BufRead> {
| -------------------------- doesn't satisfy `solution::Csv<BufReader<&[u8]>>: Iterator`
|
= note: the method `map` exists but the following trait bounds were not satisfied:
`solution::Csv<BufReader<&[u8]>>: Iterator`
which is required by `&mut solution::Csv<BufReader<&[u8]>>: Iterator`
error[E0599]: no method named `write_to` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:234:13
|
234 | csv.write_to(&mut output).unwrap();
| ^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `apply_selection` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:260:13
|
260 | csv.apply_selection(|row| Ok(row["name"].contains(".")));
| ^^^^^^^^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `write_to` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:263:13
|
263 | csv.write_to(&mut output).unwrap();
| ^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `write_to` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:285:13
|
285 | csv.write_to(&mut output).unwrap();
| ^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `parse_line` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:144:19
|
144 | let row = csv.parse_line(r#""Basic Name","13","2020-01-01""#).unwrap();
| ^^^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `parse_line` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:150:19
|
150 | let row = csv.parse_line(r#"" Name With Spaces "," 13 ","0-0-0""#).unwrap();
| ^^^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `parse_line` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:162:19
|
162 | let row = csv.parse_line(r#""13", "Name, Basic""#).unwrap();
| ^^^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `parse_line` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:168:19
|
168 | let row = csv.parse_line(r#""13, or maybe 14","Basic Name""#).unwrap();
| ^^^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `next` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:180:17
|
180 | assert!(csv.next().is_none());
| ^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `apply_selection` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:211:9
|
211 | csv.apply_selection(|row| {
| ^^^^^^^^^^^^^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
error[E0599]: no method named `map` found for struct `solution::Csv<BufReader<&[u8]>>` in the current scope
--> tests/solution_test.rs:218:30
|
218 | let filtered_names = csv.map(|row| row.unwrap()["name"].clone()).collect::<Vec<_>>();
| ^^^ method not found in `solution::Csv<BufReader<&[u8]>>`
|
::: /tmp/d20210111-1538662-1vfherq/solution/src/lib.rs:53:1
|
53 | pub struct Csv<R: BufRead> {
| -------------------------- doesn't satisfy `solution::Csv<BufReader<&[u8]>>: Iterator`
|
= note: the method `map` exists but the following trait bounds were not satisfied:
`solution::Csv<BufReader<&[u8]>>: Iterator`
which is required by `&mut solution::Csv<BufReader<&[u8]>>: Iterator`
error: aborting due to 14 previous errors
For more information about this error, try `rustc --explain E0599`.
error: could not compile `solution`
To learn more, run the command again with --verbose.