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error.rs
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//! Define internal parse error types
//! The goal is to provide a matching and a safe error API, maksing errors from LALR
use lalrpop_util::ParseError as LalrpopError;
use crate::location::Location;
use crate::token::Tok;
use std::error::Error;
use std::fmt;
/// Represents an error during lexical scanning.
#[derive(Debug, PartialEq)]
pub struct LexicalError {
pub error: LexicalErrorType,
pub location: Location,
}
#[derive(Debug, PartialEq)]
pub enum LexicalErrorType {
StringError,
UnicodeError,
NestingError,
PositionalArgumentError,
DuplicateKeywordArgumentError,
UnrecognizedToken { tok: char },
FStringError(FStringErrorType),
OtherError(String),
}
impl fmt::Display for LexicalErrorType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
LexicalErrorType::StringError => write!(f, "Got unexpected string"),
LexicalErrorType::FStringError(error) => write!(f, "Got error in f-string: {}", error),
LexicalErrorType::UnicodeError => write!(f, "Got unexpected unicode"),
LexicalErrorType::NestingError => write!(f, "Got unexpected nesting"),
LexicalErrorType::DuplicateKeywordArgumentError => {
write!(f, "keyword argument repeated")
}
LexicalErrorType::PositionalArgumentError => {
write!(f, "positional argument follows keyword argument")
}
LexicalErrorType::UnrecognizedToken { tok } => {
write!(f, "Got unexpected token {}", tok)
}
LexicalErrorType::OtherError(msg) => write!(f, "{}", msg),
}
}
}
impl From<LexicalError> for LalrpopError<Location, Tok, LexicalError> {
fn from(err: LexicalError) -> Self {
lalrpop_util::ParseError::User { error: err }
}
}
// TODO: consolidate these with ParseError
#[derive(Debug, PartialEq)]
pub struct FStringError {
pub error: FStringErrorType,
pub location: Location,
}
#[derive(Debug, PartialEq)]
pub enum FStringErrorType {
UnclosedLbrace,
UnopenedRbrace,
InvalidExpression(Box<ParseErrorType>),
InvalidConversionFlag,
EmptyExpression,
MismatchedDelimiter,
}
impl fmt::Display for FStringErrorType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
FStringErrorType::UnclosedLbrace => write!(f, "Unclosed '('"),
FStringErrorType::UnopenedRbrace => write!(f, "Unopened ')'"),
FStringErrorType::InvalidExpression(error) => {
write!(f, "Invalid expression: {}", error)
}
FStringErrorType::InvalidConversionFlag => write!(f, "Invalid conversion flag"),
FStringErrorType::EmptyExpression => write!(f, "Empty expression"),
FStringErrorType::MismatchedDelimiter => write!(f, "Mismatched delimiter"),
}
}
}
impl From<FStringError> for LalrpopError<Location, Tok, LexicalError> {
fn from(err: FStringError) -> Self {
lalrpop_util::ParseError::User {
error: LexicalError {
error: LexicalErrorType::FStringError(err.error),
location: err.location,
},
}
}
}
/// Represents an error during parsing
#[derive(Debug, PartialEq)]
pub struct ParseError {
pub error: ParseErrorType,
pub location: Location,
}
#[derive(Debug, PartialEq)]
pub enum ParseErrorType {
/// Parser encountered an unexpected end of input
EOF,
/// Parser encountered an extra token
ExtraToken(Tok),
/// Parser encountered an invalid token
InvalidToken,
/// Parser encountered an unexpected token
UnrecognizedToken(Tok, Vec<String>),
/// Maps to `User` type from `lalrpop-util`
Lexical(LexicalErrorType),
}
/// Convert `lalrpop_util::ParseError` to our internal type
impl From<LalrpopError<Location, Tok, LexicalError>> for ParseError {
fn from(err: LalrpopError<Location, Tok, LexicalError>) -> Self {
match err {
// TODO: Are there cases where this isn't an EOF?
LalrpopError::InvalidToken { location } => ParseError {
error: ParseErrorType::EOF,
location,
},
LalrpopError::ExtraToken { token } => ParseError {
error: ParseErrorType::ExtraToken(token.1),
location: token.0,
},
LalrpopError::User { error } => ParseError {
error: ParseErrorType::Lexical(error.error),
location: error.location,
},
LalrpopError::UnrecognizedToken { token, expected } => {
match token {
Some(tok) => ParseError {
error: ParseErrorType::UnrecognizedToken(tok.1, expected),
location: tok.0,
},
// EOF was observed when it was unexpected
None => ParseError {
error: ParseErrorType::EOF,
location: Default::default(),
},
}
}
}
}
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{} at {}", self.error, self.location)
}
}
impl fmt::Display for ParseErrorType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ParseErrorType::EOF => write!(f, "Got unexpected EOF"),
ParseErrorType::ExtraToken(ref tok) => write!(f, "Got extraneous token: {:?}", tok),
ParseErrorType::InvalidToken => write!(f, "Got invalid token"),
ParseErrorType::UnrecognizedToken(ref tok, _) => {
write!(f, "Got unexpected token {}", tok)
}
ParseErrorType::Lexical(ref error) => write!(f, "{}", error),
}
}
}
impl Error for ParseError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
None
}
}