Struct BufferQueue

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pub struct BufferQueue { /* private fields */ }

Expand description

A queue of owned string buffers, which supports incrementally consuming characters.

Internally it uses VecDeque and has the same complexity properties.

Implementations§

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impl BufferQueue

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pub fn is_empty(&self) -> bool

Returns whether the queue is empty.

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pub fn pop_front(&self) -> Option<StrTendril>

Get the buffer at the beginning of the queue.

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pub fn push_front(&self, buf: StrTendril)

Add a buffer to the beginning of the queue.

If the buffer is empty, it will be skipped.

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pub fn push_back(&self, buf: StrTendril)

Add a buffer to the end of the queue.

If the buffer is empty, it will be skipped.

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pub fn peek(&self) -> Option<char>

Look at the next available character without removing it, if the queue is not empty.

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pub fn pop_except_from(&self, set: SmallCharSet) -> Option<SetResult>

Pops and returns either a single character from the given set, or a buffer of characters none of which are in the set.

§Examples

use markup5ever::buffer_queue::{BufferQueue, SetResult};

let mut queue = BufferQueue::default();
queue.push_back(format_tendril!(r#"<some_tag attr="text">SomeText</some_tag>"#));
let set = small_char_set!(b'<' b'>' b' ' b'=' b'"' b'/');
let tag = format_tendril!("some_tag");
let attr = format_tendril!("attr");
let attr_val = format_tendril!("text");
assert_eq!(queue.pop_except_from(set), Some(SetResult::FromSet('<')));
assert_eq!(queue.pop_except_from(set), Some(SetResult::NotFromSet(tag)));
assert_eq!(queue.pop_except_from(set), Some(SetResult::FromSet(' ')));
assert_eq!(queue.pop_except_from(set), Some(SetResult::NotFromSet(attr)));
assert_eq!(queue.pop_except_from(set), Some(SetResult::FromSet('=')));
assert_eq!(queue.pop_except_from(set), Some(SetResult::FromSet('"')));
assert_eq!(queue.pop_except_from(set), Some(SetResult::NotFromSet(attr_val)));
// ...

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pub fn eat<F: Fn(&u8, &u8) -> bool>(&self, pat: &str, eq: F) -> Option<bool>

Consume bytes matching the pattern, using a custom comparison function eq.

Returns Some(true) if there is a match, Some(false) if there is no match, or None if it wasn’t possible to know (more data is needed).

The custom comparison function is used elsewhere to compare ascii-case-insensitively.

§Examples

use markup5ever::buffer_queue::BufferQueue;

let mut queue = BufferQueue::default();
queue.push_back(format_tendril!("testtext"));
let test_str = "test";
assert_eq!(queue.eat("test", |&a, &b| a == b), Some(true));
assert_eq!(queue.eat("text", |&a, &b| a == b), Some(true));
assert!(queue.is_empty());