Enum Expr

pub enum Expr {
    Literal(Literal),
    Paren(Paren),
    Block(Block),
    If(If),
    Loop(Loop),
    While(While),
    Break(Break),
    Continue(Continue),
    Call(Call),
    Unary(Unary),
    Binary(Binary),
    Assign(Assign),
}

Represents a general expression in CalcScript.

An expression is any valid piece of code that can be evaluated to produce a value. Expressions can be used as the right-hand side of an assignment, or as the argument to a function call.

Variants

Literal(Literal)

A literal value.

Paren(Paren)

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

Block(Block)

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

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 { ... }.

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.

Call(Call)

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

Unary(Unary)

A unary operation, such as -1 or !true.

Binary(Binary)

A binary operation, such as 1 + 2.

Assign(Assign)

An assignment of a variable or function, such as x = 1 or f(x) = x^2.

Implementations

impl Expr

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

Returns the span of the expression.

pub fn post_order_iter(&self) -> ExprIter<'_>

Returns an iterator that traverses the tree of expressions in left-to-right post-order (i.e. depth-first).

pub fn innermost(&self) -> &Expr

If this expression is a Expr::Paren, returns the innermost expression in the parenthesized expression. Otherwise, returns self.

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 Display for Expr

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

Formats the value using the given formatter.

impl From<Primary> for Expr

fn from(primary: Primary) -> Self

Converts to this type from the input type.

impl Latex for Expr

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

Format the value as LaTeX.

fn as_display(&self) -> LatexFormatter<'_, Self>

Wraps the value in a LatexFormatter, which implements Display.

impl<'source> Parse<'source> for Expr

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 Expr

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