Enum ParseError 

pub enum ParseError {
    EmptyExpression,
    ExpectedAtom {
        position: usize,
    },
    UnexpectedOperator {
        op: char,
        position: usize,
    },
    UnexpectedChar {
        ch: char,
        position: usize,
    },
    UnmatchedOpenParen {
        position: usize,
    },
    UnmatchedCloseParen {
        position: usize,
    },
}

A parse failure produced by crate::parser::parse.

Variants describe shape-level problems only: the empty input, unmatched parens, operators in disallowed positions, and trailing characters after a complete expression. Atom-content validation (identifier rules, path-pattern grammar, relational kind) is the consumer crate’s responsibility.

Variants

EmptyExpression

The input contained no atoms after trimming whitespace.

ExpectedAtom

An atom was expected at the given byte offset but the next character was an operator or end-of-input.

Fields

position: usize

Byte offset where the atom was expected.

UnexpectedOperator

An operator appeared in a position the grammar does not permit (for example, as the leading character of an expression, or immediately after another binary operator).

Fields

op: char

The offending operator byte.

position: usize

Byte offset at which it appears.

UnexpectedChar

Unconsumed input remained after a complete expression was parsed (typically a missing operator between two atoms).

Fields

ch: char

The offending character.

position: usize

Byte offset at which it appears.

UnmatchedOpenParen

An opening parenthesis was never matched by a closing one.

Fields

position: usize

Byte offset of the unmatched opener.

UnmatchedCloseParen

A closing parenthesis appeared with no matching opener.

Fields

position: usize

Byte offset of the unmatched closer.

Trait Implementations

impl Clone for ParseError

fn clone(&self) -> ParseError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParseError

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

Formats the value using the given formatter.

impl Display for ParseError

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

Formats the value using the given formatter.

impl Eq for ParseError

impl Error for ParseError

where Self: Debug + Display,

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 ErrorCompat for ParseError

fn backtrace(&self) -> Option<&Backtrace>

Returns a Backtrace that may be printed.

fn iter_chain(&self) -> ChainCompat<'_, '_>

where Self: AsErrorSource,

Returns an iterator for traversing the chain of errors, starting with the current error and continuing with recursive calls to Error::source.

impl PartialEq for ParseError

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