Решение на упр.07 задача 1 от Илиян Свечев
Резултати
- 4 точки от тестове
- 0 бонус точки
- 4 точки общо
- 2 успешни тест(а)
- 0 неуспешни тест(а)
Код
struct Map<I, F>
where I: Iterator
{
iterator: I,
func: F,
}
fn iter_map<I, F, U>(iter: I, f: F) -> Map<I, F>
where
I: Iterator,
F: Fn(I::Item) -> U
{
Map {iterator: iter, func: f}
}
impl<I, F, U> Iterator for Map<I, F>
where
I: Iterator,
F: Fn(I::Item) -> U
{
type Item = U;
fn next(&mut self) -> Option<Self::Item> {
let next_item = self.iterator.next();
match next_item {
Some(item) => {
Some((self.func)(item))
}
None => { None }
}
}
}
struct Filter<I, F> {
iterator: I,
func: F,
}
fn iter_filter<I, F>(iter: I, func: F) -> Filter<I, F>
where
I: Iterator,
F: Fn(&I::Item) -> bool,
{
Filter {iterator: iter, func: func}
}
impl<I, F> Iterator for Filter<I, F>
where I: Iterator,
F: Fn(&I::Item) -> bool,
{
type Item = I::Item;
fn next(&mut self) -> Option<Self::Item> {
while let Some(item) = self.iterator.next() {
if (self.func)(&item) {
return Some(item)
}
}
None
}
}
fn iter_filter_map<I, F, U>(iter: I, func: F) -> impl Iterator<Item = U>
where
I: Iterator,
F: Fn(I::Item) -> Option<U>,
I::Item: Copy
{
let map = iter_map(iter, func);
let filter = iter_filter(map, |x| {
match *x {
Some(_) => {true}
None => {false}
}
});
iter_map(filter, |x| {x.unwrap()})
// ако не пишехме impl Iterator трябваше да връщаме типа на резултата,
// който според компилатора е Map<Filter<Map<I, F>, impl Fn(...) -> ...>, .....
// което не е конкретен тип, който може да insert-нем с double click
}
fn get_sum(text: &str) -> i32 {
let line_has_number = |line: &&str| {
for ch in line.chars() {
if ch.is_numeric() {
return true
}
}
false
};
let filter_line = |line: &&str| {
iter_filter(line.chars(), |ch| {
ch.is_numeric() || *ch == '-'
}).collect()
};
let valid_lines = iter_filter(text.lines(), line_has_number);
let filtered_text = iter_map(valid_lines, |line| {filter_line(&line)});
let numbers = iter_map(filtered_text, |line: String| {line.parse::<i32>().unwrap()});
numbers.sum()
}
#[derive(Debug, Eq, PartialEq)]
struct FoundWord<'a>(&'a str);
fn get_num_list(text: &str) -> Result<Vec<i32>, FoundWord<'_>> {
let line_has_number = |line: &&str| {
for ch in line.chars() {
if ch.is_numeric() {
return true
}
}
false
};
let line_has_no_number = |line: &&str| {
!line_has_number(line)
};
let filter_line = |line: &&str| {
iter_filter(line.chars(), |ch| {
ch.is_numeric() || *ch == '-'
}).collect()
};
let mut invalid_lines = iter_filter(text.lines(), line_has_no_number);
while let Some(word) = invalid_lines.next() {
if word.trim() != "" {
return Err(FoundWord(word.trim()))
}
}
let valid_lines = iter_filter(text.lines(), line_has_number);
let filtered_text = iter_map(valid_lines, |line| {filter_line(&line)});
Ok(iter_map(filtered_text, |line: String| {line.parse::<i32>().unwrap()}).collect())
}
Лог от изпълнението
Updating crates.io index
Locking 17 packages to latest compatible versions
Compiling proc-macro2 v1.0.103
Compiling quote v1.0.42
Compiling unicode-ident v1.0.22
Compiling futures-sink v0.3.31
Compiling futures-core v0.3.31
Compiling futures-channel v0.3.31
Compiling pin-utils v0.1.0
Compiling memchr v2.7.6
Compiling syn v2.0.111
Compiling futures-task v0.3.31
Compiling futures-io v0.3.31
Compiling pin-project-lite v0.2.16
Compiling slab v0.4.11
Compiling solution v0.1.0 (/tmp/d20251127-1757769-1t95oko/solution)
warning: struct `Map` is never constructed
--> src/lib.rs:1:8
|
1 | struct Map<I, F>
| ^^^
|
= note: `#[warn(dead_code)]` on by default
warning: function `iter_map` is never used
--> src/lib.rs:8:4
|
8 | fn iter_map<I, F, U>(iter: I, f: F) -> Map<I, F>
| ^^^^^^^^
warning: struct `Filter` is never constructed
--> src/lib.rs:35:8
|
35 | struct Filter<I, F> {
| ^^^^^^
warning: function `iter_filter` is never used
--> src/lib.rs:40:4
|
40 | fn iter_filter<I, F>(iter: I, func: F) -> Filter<I, F>
| ^^^^^^^^^^^
warning: function `iter_filter_map` is never used
--> src/lib.rs:64:4
|
64 | fn iter_filter_map<I, F, U>(iter: I, func: F) -> impl Iterator<Item = U>
| ^^^^^^^^^^^^^^^
warning: function `get_sum` is never used
--> src/lib.rs:84:4
|
84 | fn get_sum(text: &str) -> i32 {
| ^^^^^^^
warning: struct `FoundWord` is never constructed
--> src/lib.rs:107:8
|
107 | struct FoundWord<'a>(&'a str);
| ^^^^^^^^^
warning: function `get_num_list` is never used
--> src/lib.rs:109:4
|
109 | fn get_num_list(text: &str) -> Result<Vec<i32>, FoundWord<'_>> {
| ^^^^^^^^^^^^
warning: `solution` (lib) generated 8 warnings
Compiling futures-macro v0.3.31
Compiling futures-util v0.3.31
Compiling futures-executor v0.3.31
Compiling futures v0.3.31
Finished `test` profile [unoptimized + debuginfo] target(s) in 8.55s
Running tests/solution_test.rs (target/debug/deps/solution_test-ee0783488e12dce9)
running 2 tests
test solution_test::test_adapters_ ... ok
test solution_test::test_text_parsers_ ... ok
test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s