[][src]Struct pest::Span

pub struct Span<'i> { /* fields omitted */ }

A span over a &str. It is created from either two Positions or from a Pair.

Methods

impl<'i> Span<'i>
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Attempts to create a new span. Will return None if input[start..end] is an invalid index into input.

Examples

let input = "Hello!";
assert_eq!(None, Span::new(input, 100, 0));
assert!(Span::new(input, 0, input.len()).is_some());

Returns the Span's start byte position as a usize.

Examples

let input = "ab";
let start = Position::from_start(input);
let end = start.clone();
let span = start.span(&end);

assert_eq!(span.start(), 0);

Returns the Span's end byte position as a usize.

Examples

let input = "ab";
let start = Position::from_start(input);
let end = start.clone();
let span = start.span(&end);

assert_eq!(span.end(), 0);

Returns the Span's start Position.

Examples

let input = "ab";
let start = Position::from_start(input);
let end = start.clone();
let span = start.clone().span(&end);

assert_eq!(span.start_pos(), start);

Returns the Span's end Position.

Examples

let input = "ab";
let start = Position::from_start(input);
let end = start.clone();
let span = start.span(&end);

assert_eq!(span.end_pos(), end);

Splits the Span into a pair of Positions.

Examples

let input = "ab";
let start = Position::from_start(input);
let end = start.clone();
let span = start.clone().span(&end);

assert_eq!(span.split(), (start, end));

Captures a slice from the &str defined by the Span.

Examples

enum Rule {}

let input = "abc";
let mut state: Box<pest::ParserState<Rule>> = pest::ParserState::new(input).skip(1).unwrap();
let start_pos = state.position().clone();
state = state.match_string("b").unwrap();
let span = start_pos.span(&state.position().clone());
assert_eq!(span.as_str(), "b");

Important traits for Lines<'i>

Iterates over all lines (partially) covered by this span.

Examples

enum Rule {}

let input = "a\nb\nc";
let mut state: Box<pest::ParserState<Rule>> = pest::ParserState::new(input).skip(2).unwrap();
let start_pos = state.position().clone();
state = state.match_string("b\nc").unwrap();
let span = start_pos.span(&state.position().clone());
assert_eq!(span.lines().collect::<Vec<_>>(), vec!["b\n", "c"]);

Trait Implementations

impl<'i> PartialEq<Span<'i>> for Span<'i>
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This method tests for !=.

impl<'i> Clone for Span<'i>
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Performs copy-assignment from source. Read more

impl<'i> Eq for Span<'i>
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impl<'i> Debug for Span<'i>
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impl<'i> Hash for Span<'i>
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Feeds a slice of this type into the given [Hasher]. Read more

Auto Trait Implementations

impl<'i> Send for Span<'i>

impl<'i> Sync for Span<'i>

Blanket Implementations

impl<T> From for T
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impl<T, U> Into for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone
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impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
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impl<T> BorrowMut for T where
    T: ?Sized
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impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Any for T where
    T: 'static + ?Sized
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