Enum parol::parser::errors::ParolParserError

pub enum ParolParserError {
    UnknownScanner {
        context: String,
        name: String,
        input: PathBuf,
        token: Location,
    },
    EmptyGroup {
        context: String,
        input: PathBuf,
        start: Location,
        end: Location,
    },
    EmptyOptional {
        context: String,
        input: PathBuf,
        start: Location,
        end: Location,
    },
    EmptyRepetition {
        context: String,
        input: PathBuf,
        start: Location,
        end: Location,
    },
    ConflictingTokenAliases {
        first_alias: String,
        second_alias: String,
        expanded: String,
        input: PathBuf,
        first: Location,
        second: Location,
    },
    EmptyScanners {
        empty_scanners: Vec<String>,
    },
    UnsupportedGrammarType {
        grammar_type: String,
        input: PathBuf,
        token: Location,
    },
    UnsupportedFeature {
        feature: String,
        hint: String,
        input: PathBuf,
        token: Location,
    },
    InvalidTokenInTransition {
        context: String,
        token: String,
        input: PathBuf,
        location: Location,
    },
    TokenIsNotInScanner {
        context: String,
        scanner: String,
        token: String,
        input: PathBuf,
        location: Location,
    },
    MixedScannerSwitching {
        context: String,
        input: PathBuf,
        location: Location,
    },
}

Error types used by the crate::parser::ParolGrammar’s semantic actions

Variants

UnknownScanner

Undeclared scanner found. Please declare a scanner via %scanner name {{…}}

Fields

context: String

Context (semantic action) where the error was issued

name: String

Name of the unknown scanner state

input: PathBuf

Source

token: Location

Location

EmptyGroup

Empty Groups () are not allowed.

Fields

context: String

Context (semantic action) where the error was issued

input: PathBuf

Source

start: Location

Start location

end: Location

End location

EmptyOptional

Empty Optionals [] are not allowed.

Fields

context: String

Context (semantic action) where the error was issued

input: PathBuf

Source

start: Location

Start location

end: Location

End location

EmptyRepetition

Empty Repetitions {{}} are not allowed.

Fields

context: String

Context (semantic action) where the error was issued

input: PathBuf

Source

start: Location

Start location

end: Location

End location

ConflictingTokenAliases

Multiple token aliases that expand to the same text will produce a terminal conflict.

Fields

first_alias: String

First

second_alias: String

Second

expanded: String

Expanded

input: PathBuf

Source

first: Location

First alias

second: Location

Second alias

EmptyScanners

Empty Scanner states are not allowed.

Fields

empty_scanners: Vec<String>

Names of the empty scanner states

UnsupportedGrammarType

Unsupported grammar type

Fields

grammar_type: String

The grammar type found

input: PathBuf

Source

token: Location

Location

UnsupportedFeature

Unsupported feature

Fields

feature: String

The feature found

hint: String

Hint

input: PathBuf

Source

token: Location

Location

InvalidTokenInTransition

Invalid token in transition, e.g. a token that is not defined in the grammar is used in a transition. Use a primary non-terminal for the token.

Fields

context: String

Context where the error was issued

token: String

Token that is not defined matched against a valid primary non-terminal

input: PathBuf

Source file

location: Location

Location of the token

TokenIsNotInScanner

The token that is used to initiate a transition is not defined in this scanner.

Fields

context: String

Context where the error was issued

scanner: String

The scanner where the token is not defined

token: String

Token that is not defined in the scanner

input: PathBuf

Source file

location: Location

Location of the token

MixedScannerSwitching

Mixed scanner switching is not allowed - use either parser-based or scanner-based switching. Parser-based switching is done via the %sc, %push and %pop directives productions. Scanner-based switching is done via the %on directive in the header of the grammar file.

Fields

context: String

Context where the error was issued

input: PathBuf

Source file

location: Location

Location of the token

Trait Implementations

impl Debug for ParolParserError

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

Formats the value using the given formatter.

impl Display for ParolParserError

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

Formats the value using the given formatter.

impl Error for ParolParserError

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

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 From<ParolParserError> for ParolError

fn from(err: ParolParserError) -> Self

Converts to this type from the input type.