Struct rustc_lexer::cursor::Cursor

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pub struct Cursor<'a> {
    len_remaining: usize,
    chars: Chars<'a>,
    prev: char,
}
Expand description

Peekable iterator over a char sequence.

Next characters can be peeked via first method, and position can be shifted forward via bump method.

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§len_remaining: usize§chars: Chars<'a>

Iterator over chars. Slightly faster than a &str.

§prev: char

Implementations§

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impl<'a> Cursor<'a>

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pub fn new(input: &'a str) -> Cursor<'a>

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pub fn as_str(&self) -> &'a str

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pub(crate) fn prev(&self) -> char

Returns the last eaten symbol (or '\0' in release builds). (For debug assertions only.)

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pub fn first(&self) -> char

Peeks the next symbol from the input stream without consuming it. If requested position doesn’t exist, EOF_CHAR is returned. However, getting EOF_CHAR doesn’t always mean actual end of file, it should be checked with is_eof method.

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pub(crate) fn second(&self) -> char

Peeks the second symbol from the input stream without consuming it.

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pub fn third(&self) -> char

Peeks the third symbol from the input stream without consuming it.

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pub(crate) fn is_eof(&self) -> bool

Checks if there is nothing more to consume.

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pub(crate) fn pos_within_token(&self) -> u32

Returns amount of already consumed symbols.

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pub(crate) fn reset_pos_within_token(&mut self)

Resets the number of bytes consumed to 0.

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pub(crate) fn bump(&mut self) -> Option<char>

Moves to the next character.

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pub(crate) fn eat_while(&mut self, predicate: impl FnMut(char) -> bool)

Eats symbols while predicate returns true or until the end of file is reached.

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impl Cursor<'_>

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pub fn advance_token(&mut self) -> Token

Parses a token from the input string.

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pub(crate) fn line_comment(&mut self) -> TokenKind

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pub(crate) fn block_comment(&mut self) -> TokenKind

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pub(crate) fn whitespace(&mut self) -> TokenKind

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pub(crate) fn raw_ident(&mut self) -> TokenKind

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pub(crate) fn ident_or_unknown_prefix(&mut self) -> TokenKind

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pub(crate) fn fake_ident_or_unknown_prefix(&mut self) -> TokenKind

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pub(crate) fn c_or_byte_string( &mut self, mk_kind: impl FnOnce(bool) -> LiteralKind, mk_kind_raw: impl FnOnce(Option<u8>) -> LiteralKind, single_quoted: Option<fn(_: bool) -> LiteralKind> ) -> TokenKind

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pub(crate) fn number(&mut self, first_digit: char) -> LiteralKind

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pub(crate) fn lifetime_or_char(&mut self) -> TokenKind

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pub(crate) fn single_quoted_string(&mut self) -> bool

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pub(crate) fn double_quoted_string(&mut self) -> bool

Eats double-quoted string and returns true if string is terminated.

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pub(crate) fn raw_double_quoted_string( &mut self, prefix_len: u32 ) -> Result<u8, RawStrError>

Eats the double-quoted string and returns n_hashes and an error if encountered.

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pub(crate) fn raw_string_unvalidated( &mut self, prefix_len: u32 ) -> Result<u32, RawStrError>

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pub(crate) fn eat_decimal_digits(&mut self) -> bool

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pub(crate) fn eat_hexadecimal_digits(&mut self) -> bool

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pub(crate) fn eat_float_exponent(&mut self) -> bool

Eats the float exponent. Returns true if at least one digit was met, and returns false otherwise.

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pub(crate) fn eat_literal_suffix(&mut self)

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pub(crate) fn eat_identifier(&mut self)

Auto Trait Implementations§

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impl<'a> Freeze for Cursor<'a>

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impl<'a> RefUnwindSafe for Cursor<'a>

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impl<'a> Send for Cursor<'a>

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impl<'a> Sync for Cursor<'a>

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impl<'a> Unpin for Cursor<'a>

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impl<'a> UnwindSafe for Cursor<'a>

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, 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.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes