Enum BandMathError 

pub enum BandMathError {
    UnexpectedToken {
        pos: usize,
        found: String,
    },
    UnknownFunction(String),
    InvalidBandIndex(u32),
    WrongArgCount {
        function: String,
        expected: usize,
        actual: usize,
    },
    DivByConstantZero,
    TrailingTokens(usize),
    EmptyExpression,
    UnmatchedParen,
    InvalidNumber {
        pos: usize,
        text: String,
    },
}

Errors produced while lexing/parsing a band-math expression.

Variants

UnexpectedToken

Encountered a character or token that wasn’t expected at this position.

Fields

pos: usize

Byte offset into the original source string.

found: String

Display text of the offending fragment.

UnknownFunction(String)

Identifier used like a function (name(...)) is not a known builtin.

InvalidBandIndex(u32)

Bn band reference is outside the allowed inclusive range 1..=999.

The wrapped value is the raw integer that was parsed, or 0 for B0.

WrongArgCount

Function call had the wrong number of arguments.

Fields

function: String

Function name as it appeared in the source.

expected: usize

Number of arguments the function expects.

actual: usize

Number of arguments actually supplied.

DivByConstantZero

Detected literal / 0 or / 0.0 at parse time.

TrailingTokens(usize)

Parser stopped before consuming the entire token stream.

EmptyExpression

Input string was empty or contained only whitespace.

UnmatchedParen

( without a matching ) (or vice-versa).

InvalidNumber

Number literal failed to parse as f32.

Fields

pos: usize

Byte offset into the original source string.

text: String

Raw text that failed to parse.

Trait Implementations

impl Clone for BandMathError

fn clone(&self) -> BandMathError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BandMathError

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

Formats the value using the given formatter.

impl Display for BandMathError

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

Formats the value using the given formatter.

impl Error for BandMathError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for BandMathError

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