Struct pest::iterators::Pair

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pub struct Pair<'i, R> { /* private fields */ }
Expand description

A matching pair of Tokens and everything between them.

A matching Token pair is formed by a Token::Start and a subsequent Token::End with the same Rule, with the condition that all Tokens between them can form such pairs as well. This is similar to the brace matching problem in editors.

Implementations§

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impl<'i, R: RuleType> Pair<'i, R>

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pub fn as_rule(&self) -> R

Returns the Rule of the Pair.

§Examples
enum Rule {
    a
}

let input = "";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::a ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_rule(), Rule::a);
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pub fn as_str(&self) -> &'i str

Captures a slice from the &str defined by the token Pair.

§Examples
enum Rule {
    ab
}

let input = "ab";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_str(), "ab");
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pub fn get_input(&self) -> &'i str

Returns the input string of the Pair.

This function returns the input string of the Pair as a &str. This is the source string from which the Pair was created. The returned &str can be used to examine the contents of the Pair or to perform further processing on the string.

§Examples
enum Rule {
    ab
}

// Example: Get input string from a Pair

let input = "ab";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_str(), "ab");
assert_eq!(input, pair.get_input());
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pub fn into_span(self) -> Span<'i>

👎Deprecated since 2.0.0: Please use as_span instead

Returns the Span defined by the Pair, consuming it.

§Examples
enum Rule {
    ab
}

let input = "ab";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.into_span().as_str(), "ab");
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pub fn as_span(&self) -> Span<'i>

Returns the Span defined by the Pair, without consuming it.

§Examples
enum Rule {
    ab
}

let input = "ab";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_span().as_str(), "ab");
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pub fn as_node_tag(&self) -> Option<&str>

Get current node tag

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pub fn into_inner(self) -> Pairs<'i, R>

Returns the inner Pairs between the Pair, consuming it.

§Examples
enum Rule {
    a
}

let input = "";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::a ...
}).unwrap().next().unwrap();

assert!(pair.into_inner().next().is_none());
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pub fn tokens(self) -> Tokens<'i, R>

Returns the Tokens for the Pair.

§Examples
enum Rule {
    a
}

let input = "";
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::a ...
}).unwrap().next().unwrap();
let tokens: Vec<_> = pair.tokens().collect();

assert_eq!(tokens.len(), 2);
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pub fn line_col(&self) -> (usize, usize)

Returns the line, col of this pair start.

Trait Implementations§

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impl<'i, R: Clone> Clone for Pair<'i, R>

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fn clone(&self) -> Pair<'i, R>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'i, R: RuleType> Debug for Pair<'i, R>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'i, R: RuleType> Display for Pair<'i, R>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'i, R: Hash> Hash for Pair<'i, R>

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fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<'i, R: PartialEq> PartialEq for Pair<'i, R>

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fn eq(&self, other: &Pair<'i, R>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'i, R: Eq> Eq for Pair<'i, R>

Auto Trait Implementations§

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impl<'i, R> RefUnwindSafe for Pair<'i, R>
where R: RefUnwindSafe,

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impl<'i, R> !Send for Pair<'i, R>

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impl<'i, R> !Sync for Pair<'i, R>

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impl<'i, R> Unpin for Pair<'i, R>

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impl<'i, R> UnwindSafe for Pair<'i, R>
where R: RefUnwindSafe,

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.