Enum Primary

pub enum Primary {
    Literal(Literal),
    Paren(Paren),
    Block(Block),
    Sum(Sum),
    Product(Product),
    If(If),
    Loop(Loop),
    While(While),
    For(For),
    Then(Then),
    Of(Of),
    Break(Break),
    Continue(Continue),
    Return(Return),
    Call(Call),
    Index(Index),
}

Represents a primary expression in CalcScript.

Primary expressions extend the concept of Atom by allowing for more complex and ambiguous expressions that are still self-contained. These extensions include function calls and list indexing expressions, which can be ambiguous when encountered in isolation.

For example, when trying to parse a Primary, a literal value like abc cannot automatically be declared a Primary::Literal. Instead, we must parse forward a little more to see if this is actually calling a function named abc, or indexing into a list named abc, or neither.

Variants

Literal(Literal)

A literal value.

Paren(Paren)

A parenthesized expression, such as (1 + 2).

Block(Block)

A blocked expression, such as {1 + 2}.

Sum(Sum)

A sum expression, such as sum n in 1..10 of n.

Product(Product)

A product expression, such as product n in 1..10 of n.

If(If)

An if expression, such as if x > 0 then x else -x.

Loop(Loop)

A loop expression, as in loop { ... }.

While(While)

A while loop expression, as in while x > 0 then { ... }.

For(For)

A for loop expression, as in for i in 0..10 then print(i).

Then(Then)

A then expression, as in then x += 1.

Of(Of)

An of expression, as in of x.

Break(Break)

A break expression, used to exit a loop, optionally with a value.

Continue(Continue)

A continue expression, used to skip the rest of a loop iteration.

Return(Return)

A return expression, as in return x, used to return a value from a function.

Call(Call)

A function call, such as abs(-1).

Index(Index)

List indexing, such as list[0].

Implementations

impl Primary

pub fn span(&self) -> Range<usize>

Returns the span of the primary expression.

Trait Implementations

impl Clone for Primary

fn clone(&self) -> Primary

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Primary

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

Formats the value using the given formatter.

impl From<Atom> for Primary

fn from(atom: Atom) -> Self

Converts to this type from the input type.

impl From<Primary> for Expr

fn from(primary: Primary) -> Self

Converts to this type from the input type.

impl<'source> Parse<'source> for Primary

fn std_parse( input: &mut Parser<'source>, recoverable_errors: &mut Vec<Error>, ) -> Result<Self, Vec<Error>>

Parses a value from the given stream of tokens, advancing the stream past the consumed tokens if parsing is successful.

fn parse(input: &mut Parser<'source>) -> ParseResult<Self>

Parses a value from the given stream of tokens, advancing the stream past the consumed tokens if parsing is successful.

impl PartialEq for Primary

fn eq(&self, other: &Primary) -> 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 Primary

impl StructuralPartialEq for Primary