Enum ExpressionError 

pub enum ExpressionError {
    Empty,
    TooLong,
    TooDeep,
    UnexpectedChar {
        pos: usize,
        ch: char,
    },
    UnterminatedString {
        pos: usize,
    },
    InvalidNumber {
        pos: usize,
    },
    UnexpectedToken {
        pos: usize,
        found: String,
    },
    UnexpectedEnd,
    UnknownRoot(String),
}

Error returned when an expression fails to parse.

Positions are byte offsets into the source.

Examples

use ironflow_engine::expression::{Expression, ExpressionError};

let err = Expression::parse("foo.bar == 1").unwrap_err();
assert_eq!(err, ExpressionError::UnknownRoot("foo".to_string()));

Variants

Empty

The source is empty or only whitespace.

TooLong

The source exceeds MAX_EXPRESSION_LEN bytes.

TooDeep

Parentheses or ! are nested deeper than MAX_EXPRESSION_DEPTH.

UnexpectedChar

A character that starts no token.

Fields

pos: usize

Byte offset of the character.

ch: char

The offending character.

UnterminatedString

A string literal without its closing quote.

Fields

pos: usize

Byte offset of the opening quote.

InvalidNumber

A malformed number literal.

Fields

pos: usize

Byte offset of the number.

UnexpectedToken

A token that does not fit the grammar at this point.

Fields

pos: usize

Byte offset of the token.

found: String

Text of the token.

UnexpectedEnd

The source ended where more input was expected.

UnknownRoot(String)

A path starts with an identifier outside EXPRESSION_ROOTS.

Trait Implementations

impl Clone for ExpressionError

fn clone(&self) -> Self

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: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ExpressionError