Struct Token 

pub struct Token {
    pub token_type: TokenType,
    pub image: String,
    pub begin_offset: usize,
    pub end_offset: usize,
    pub next: Option<usize>,
    pub previous: Option<usize>,
}

A single token in the input stream

Tokens are the atomic units produced by the lexer. Each token has:

• A type (e.g., INTEGER, PLUS, EOF)
• An image (the actual text matched)
• Position information (begin/end offsets)
• Optional links to previous/next tokens

Fields

token_type: TokenType

The type of this token

image: String

The actual text of this token

begin_offset: usize

Absolute offset in the input where this token begins

end_offset: usize

Absolute offset in the input where this token ends

next: Option<usize>

Index of the next token (if any)

previous: Option<usize>

Index of the previous token (if any)

Implementations

impl Token

pub fn new( token_type: TokenType, image: String, begin_offset: usize, end_offset: usize, ) -> Self

Create a new token

pub fn len(&self) -> usize

Get the length of this token in characters

pub fn is_empty(&self) -> bool

Check if this token is empty

pub fn is_type(&self, token_type: TokenType) -> bool

Check if this token is of a specific type

pub fn is_one_of(&self, types: &[TokenType]) -> bool

Check if this token is one of the specified types

Trait Implementations

impl Clone for Token

fn clone(&self) -> Token

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Token

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

Formats the value using the given formatter.

impl Display for Token

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

Formats the value using the given formatter.