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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