Struct Group

pub struct Group<D> { /* private fields */ }

A delimited group.

For more information, see the module documentation.

Implementations

impl<D: Delimiters> Group<D>

pub fn into_token_stream(self) -> TokenStream

Returns the contained TokenStream.

Examples found in repository

examples/calc.rs (line 89)

fn primary(input: ParseStream) -> Result<Expr> {
    let lookahead = input.lookahead();
    if lookahead.peek(token::LitFloat) {
        Ok(Expr::Num(input.parse::<token::LitFloat>()?.value()))
    } else if lookahead.peek(token::LitInt) {
        Ok(Expr::Num(input.parse::<token::LitInt>()?.value() as f64))
    } else if lookahead.peek(token::LeftParen) {
        let group: Group<Parentheses> = input.parse()?;
        parse(group.into_token_stream())
    } else {
        Err(lookahead.error())
    }
}

examples/lox/main.rs (line 438)

    fn parse(input: ParseStream) -> Result<Self> {
        let name: Ident = input.parse()?;
        let mut contents: Group<Parentheses> = input.parse()?;
        contents.remove_whitespace();
        let Parentheses(span) = contents.delimiters();
        let tokens = contents.into_token_stream();
        let params: Vec<Ident> = if tokens.is_empty() {
            vec![]
        } else {
            let params: Punctuated<Ident, Punct![","]> =
                Punctuated::parse_separated.parse(tokens)?;
            params.into_iter().collect()
        };
        if params.len() >= 255 {
            input.add_error(input.new_error(
                "Can't have more than 254 parameters".to_string(),
                span,
                error_codes::TOO_MANY_ARGS,
            ));
        }
        let mut contents: Group<Braces> = input.parse()?;
        contents.remove_whitespace();
        let body = block.parse(contents.into_token_stream())?;
        Ok(Function { name, params, body })
    }

pub fn delimiters(&self) -> D

Returns a token representing the delimiters of this group.

Examples found in repository

examples/lox/main.rs (line 437)

    fn parse(input: ParseStream) -> Result<Self> {
        let name: Ident = input.parse()?;
        let mut contents: Group<Parentheses> = input.parse()?;
        contents.remove_whitespace();
        let Parentheses(span) = contents.delimiters();
        let tokens = contents.into_token_stream();
        let params: Vec<Ident> = if tokens.is_empty() {
            vec![]
        } else {
            let params: Punctuated<Ident, Punct![","]> =
                Punctuated::parse_separated.parse(tokens)?;
            params.into_iter().collect()
        };
        if params.len() >= 255 {
            input.add_error(input.new_error(
                "Can't have more than 254 parameters".to_string(),
                span,
                error_codes::TOO_MANY_ARGS,
            ));
        }
        let mut contents: Group<Braces> = input.parse()?;
        contents.remove_whitespace();
        let body = block.parse(contents.into_token_stream())?;
        Ok(Function { name, params, body })
    }

pub fn remove_whitespace(&mut self)

Removes all whitespace from the TokenStream in self.

Examples found in repository

examples/lox/main.rs (line 436)

    fn parse(input: ParseStream) -> Result<Self> {
        let name: Ident = input.parse()?;
        let mut contents: Group<Parentheses> = input.parse()?;
        contents.remove_whitespace();
        let Parentheses(span) = contents.delimiters();
        let tokens = contents.into_token_stream();
        let params: Vec<Ident> = if tokens.is_empty() {
            vec![]
        } else {
            let params: Punctuated<Ident, Punct![","]> =
                Punctuated::parse_separated.parse(tokens)?;
            params.into_iter().collect()
        };
        if params.len() >= 255 {
            input.add_error(input.new_error(
                "Can't have more than 254 parameters".to_string(),
                span,
                error_codes::TOO_MANY_ARGS,
            ));
        }
        let mut contents: Group<Braces> = input.parse()?;
        contents.remove_whitespace();
        let body = block.parse(contents.into_token_stream())?;
        Ok(Function { name, params, body })
    }

pub fn without_whitespace(self) -> Group<D>

Consumes self, returning a new Group<D> with all whitespace removed.

Trait Implementations

impl<D: Clone> Clone for Group<D>

fn clone(&self) -> Group<D>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<D: Debug> Debug for Group<D>

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

Formats the value using the given formatter.

impl<D> Hash for Group<D>

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<D: Delimiters> Parse for Group<D>

fn parse(input: ParseStream<'_>) -> Result<Self>

Parses the input into this type.

impl<D> PartialEq for Group<D>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<D> PartialOrd for Group<D>

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<D> Eq for Group<D>