Enum Token

pub enum Token {
    Unsigned(u16),
    Signed(i16),
    Reg(u8),
    Ident(Ident),
    Directive(String),
    String(String),
    Colon,
    Comma,
    Comment,
    NewLine,
}

A unit of information in LC3 source code.

Variants

Unsigned(u16)

An unsigned numeric value (e.g., 9, #14, x7F, etc.)

Signed(i16)

A signed numeric value (e.g., -9, #-14, x-7F, etc.)

Reg(u8)

A register value (i.e., R0-R7)

Ident(Ident)

An identifier.

This can refer to either:

• a label (e.g., IF, WHILE, ENDIF, IF1)
• an instruction (e.g. ADD, AND, NOT)

This token type is case-insensitive.

Directive(String)

A directive (e.g., .orig, .end).

String(String)

A string literal (e.g., "Hello!")

Colon

A colon, which can optionally appear after labels

Comma

A comma, which delineate operands of an instruction

Comment

A comment, which starts with a semicolon and spans the remaining part of the line.

NewLine

A new line

Trait Implementations

impl Debug for Token

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

Formats the value using the given formatter.

impl<'s> Logos<'s> for Token

type Error = LexErr

Error type returned by the lexer. This can be set using #[logos(error = MyError)]. Defaults to () if not set.

type Extras = ()

Associated type Extras for the particular lexer. This can be set using #[logos(extras = MyExtras)] and accessed inside callbacks.

type Source = str

Source type this token can be lexed from. This will default to str, unless one of the defined patterns explicitly uses non-unicode byte values or byte slices, in which case that implementation will use [u8].

fn lex(lex: &mut Lexer<'s, Self>)

The heart of Logos. Called by the Lexer. The implementation for this function is generated by the logos-derive crate.

fn lexer(source: &'source Self::Source) -> Lexer<'source, Self>

where Self::Extras: Default,

Create a new instance of a Lexer that will produce tokens implementing this Logos.

fn lexer_with_extras( source: &'source Self::Source, extras: Self::Extras, ) -> Lexer<'source, Self>

Create a new instance of a Lexer with the provided Extras that will produce tokens implementing this Logos.

impl PartialEq for Token

fn eq(&self, other: &Token) -> 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 Eq for Token

impl StructuralPartialEq for Token