Struct ExpressionError 

#[non_exhaustive]
pub struct ExpressionError {
    pub description: String,
    pub start: i32,
    pub end: i32,
}

What is wrong with an expression, and where.

The positions are indices into the expression text that was checked: start is where the error begins and end is the first character past it, so the pair slices the offending span.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

description: String

The engine’s description of the error.

start: i32

Index in the expression where the error begins.

end: i32

Index of the first character beyond the error.

Implementations

impl ExpressionError

pub fn span<'text>(&self, expression: &'text str) -> Option<&'text str>

The part of expression the engine flagged, when the reported span falls inside it.

A caller underlining the error in a panel wants the span rather than the indices. Returns None if the span is not a valid range within the text, which is what the engine reports when the error has no single location.

Trait Implementations

impl Clone for ExpressionError

fn clone(&self) -> ExpressionError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExpressionError

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

Formats the value using the given formatter.

impl Display for ExpressionError

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

Formats the value using the given formatter.

impl Eq for ExpressionError

impl Error for ExpressionError

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 ExpressionError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ExpressionError