Enum dmgrs::parser::Expr

pub enum Expr {
    Num(Spanned<u16>),
    Ident(Spanned<&'static str>),
    BitOr(Box<Spanned<Expr>>, Box<Spanned<Expr>>),
    DirectiveBit(Box<Spanned<Expr>>),
    DirectiveSizeOfVal(Spanned<&'static str>),
}

An “expression” means an integer constant expression.

They can assigned to a const, or used inline in an instruction.

Variants

Num(Spanned<u16>)

An actual numeric value, without anything more to look up or evaluate.

Ident(Spanned<&'static str>)

The name of a const

BitOr(Box<Spanned<Expr>>, Box<Spanned<Expr>>)

Bitwise OR operation, left and right hand sides.

DirectiveBit(Box<Spanned<Expr>>)

bit![x], an arguably more readable way to write 1 << x

DirectiveSizeOfVal(Spanned<&'static str>)

size_of_val![ident] gives the size (in bytes) of a named fn or static

Implementations

impl Expr

pub fn parser() -> impl Parser<Lexeme, Expr, Error = Simple<Lexeme>>

Parses any expression, which means it parses a heck of a lot.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl Hash for Expr

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, 

Feeds a slice of this type into the given Hasher.

impl Ord for Expr

fn cmp(&self, other: &Expr) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self where
    Self: PartialOrd<Self>, 

Restrict a value to a certain interval.

impl PartialEq<Expr> for Expr

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd<Expr> for Expr

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Eq for Expr

impl StructuralEq for Expr

impl StructuralPartialEq for Expr