Enum liblet::grammar::GrammarError

pub enum GrammarError {
    WrongNonTerminals,
    WrongTerminals,
    WrongStartSymbol(Symbol),
    SymbolError(SymbolError),
    ProductionError(ProductionError),
    NoStartSymbol(Option<String>),
    MultipleStartSymbols(Production),
}

Variants

WrongNonTerminals

Error returned if any of the given non terminals is an invalid non terminal symbol.

WrongTerminals

Error returned if any of the given terminals is an invalid terminal symbol.

WrongStartSymbol(Symbol)

Error returned if the given start symbol is an invalid non terminal symbol.

SymbolError(SymbolError)

Error returned if an error occurred during symbol creation.

ProductionError(ProductionError)

Error returned if an error occurred during productions creation.

NoStartSymbol(Option<String>)

Error returned if trying to create a grammar without a start symbol.

The optional passed argument is the reason which caused the grammar to not have a start symbol and can be useful for debugging purposes

When trying to create a grammar from string, the start symbol will be taken from the left hand side of the first produciton rule, that is, it should be a 1 long collection of symbols.

MultipleStartSymbols(Production)

Error returned if trying to create a grammar with too many start symbols.

The passed production argument is the production from which a start symbol has been tried to extract.

When trying to create a grammar from string, the start symbol will be taken from the left hand side of the first produciton rule, that is, it should be a 1 long collection of symbols.

Trait Implementations

impl Clone for GrammarError

fn clone(&self) -> GrammarError

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for GrammarError

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

Formats the value using the given formatter.

impl Display for GrammarError

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

Formats the value using the given formatter.

impl Eq for GrammarError

impl Error for GrammarError

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

The lower-level source of this error, if any.

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

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

Returns a stack backtrace, if available, of where this error occurred.

fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

if let Err(e) = "xc".parse::<u32>() { // Print e itself, no need for description(). eprintln!("Error: {}", e); }

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

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl From<ProductionError> for GrammarError

fn from(e: ProductionError) -> Self

Performs the conversion.

impl Hash for GrammarError

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl PartialEq<GrammarError> for GrammarError

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl StructuralEq for GrammarError

impl StructuralPartialEq for GrammarError