Enum calc_lib::E

pub enum E {
    MissingLF,
    InvalidQuit,
    InvalidRecall,
    DivByZero(usize),
    ExpIsNotInt(usize),
    ExpDivByZero(usize),
    NotNonNegIntFact(usize),
    InvalidDec(usize),
    NotEnoughPrevResults(u8),
    InvalidAbs(usize),
    InvalidPar(usize),
    MissingTerm(usize),
    TrailingSyms(usize),
}

The error that is returned when attempting to evaluate the input.

Variants

MissingLF

The input was not terminated with a line feed.

InvalidQuit

The input began with a q but had other non-spaces that followed it.

InvalidRecall

The input began with an = but was otherwise syntactically invalid.

DivByZero(usize)

A sub-expression in the input would have led to a division by zero.

ExpIsNotInt(usize)

A sub-expression in the input would have led to a rational number that was not 0 or 1 to be raised to a non-integer power.

ExpDivByZero(usize)

A sub-expression in the input would have led to 0 being raised to a negative power which itself would have led to a division by zero.

NotNonNegIntFact(usize)

A sub-expression in the input would have led to a non-integer factorial or a negative integer factorial.

InvalidDec(usize)

The input contained a non-empty sequence of digits followed by . which was not followed by a non-empty sequence of digits.

NotEnoughPrevResults(u8)

A recall expression was used to recall the i-th previous result, but there are fewer than i previous results where i ∈ {1, 2, 3, 4, 5, 6, 7, 8}.

InvalidAbs(usize)

The input did not contain a closing |.

InvalidPar(usize)

The input did not contain a closing ).

MissingTerm(usize)

A sub-expression in the input had a missing terminal expression where a terminal expression is a decimal literal expression, recall expression, absolute value expression, or a parenthetical expression.

TrailingSyms(usize)

The input started with a valid expression but was immediately followed by symbols that could not be chained with the preceding expression.

Trait Implementations

impl Clone for E

fn clone(&self) -> E

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for E

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

Formats the value using the given formatter.

impl Display for E

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

Formats the value using the given formatter.

impl Copy for E