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use std::{error::Error as StdError, fmt, io, str::Utf8Error, string::FromUtf8Error};
use serde::{de, ser};
use crate::parse::{is_ident_first_char, is_ident_other_char, is_ident_raw_char, BASE64_ENGINE};
/// This type represents all possible errors that can occur when
/// serializing or deserializing RON data.
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct SpannedError {
pub code: Error,
pub position: Position,
}
pub type Result<T, E = Error> = std::result::Result<T, E>;
pub type SpannedResult<T> = std::result::Result<T, SpannedError>;
#[derive(Clone, Debug, PartialEq, Eq)]
#[non_exhaustive]
pub enum Error {
Io(String),
Message(String),
Base64Error(base64::DecodeError),
Eof,
ExpectedArray,
ExpectedArrayEnd,
ExpectedAttribute,
ExpectedAttributeEnd,
ExpectedBoolean,
ExpectedComma,
ExpectedChar,
ExpectedFloat,
FloatUnderscore,
ExpectedInteger,
ExpectedOption,
ExpectedOptionEnd,
ExpectedMap,
ExpectedMapColon,
ExpectedMapEnd,
ExpectedDifferentStructName {
expected: &'static str,
found: String,
},
ExpectedStructLike,
ExpectedNamedStructLike(&'static str),
ExpectedStructLikeEnd,
ExpectedUnit,
ExpectedString,
ExpectedStringEnd,
ExpectedIdentifier,
InvalidEscape(&'static str),
IntegerOutOfBounds,
NoSuchExtension(String),
UnclosedBlockComment,
UnderscoreAtBeginning,
UnexpectedByte(char),
Utf8Error(Utf8Error),
TrailingCharacters,
InvalidValueForType {
expected: String,
found: String,
},
ExpectedDifferentLength {
expected: String,
found: usize,
},
NoSuchEnumVariant {
expected: &'static [&'static str],
found: String,
outer: Option<String>,
},
NoSuchStructField {
expected: &'static [&'static str],
found: String,
outer: Option<String>,
},
MissingStructField {
field: &'static str,
outer: Option<String>,
},
DuplicateStructField {
field: &'static str,
outer: Option<String>,
},
InvalidIdentifier(String),
SuggestRawIdentifier(String),
ExceededRecursionLimit,
}
impl fmt::Display for SpannedError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if (self.position == Position { line: 0, col: 0 }) {
write!(f, "{}", self.code)
} else {
write!(f, "{}: {}", self.position, self.code)
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
Error::Io(ref s) => f.write_str(s),
Error::Message(ref s) => f.write_str(s),
Error::Base64Error(ref e) => fmt::Display::fmt(e, f),
Error::Eof => f.write_str("Unexpected end of RON"),
Error::ExpectedArray => f.write_str("Expected opening `[`"),
Error::ExpectedArrayEnd => f.write_str("Expected closing `]`"),
Error::ExpectedAttribute => f.write_str("Expected an `#![enable(...)]` attribute"),
Error::ExpectedAttributeEnd => {
f.write_str("Expected closing `)]` after the enable attribute")
}
Error::ExpectedBoolean => f.write_str("Expected boolean"),
Error::ExpectedComma => f.write_str("Expected comma"),
Error::ExpectedChar => f.write_str("Expected char"),
Error::ExpectedFloat => f.write_str("Expected float"),
Error::FloatUnderscore => f.write_str("Unexpected underscore in float"),
Error::ExpectedInteger => f.write_str("Expected integer"),
Error::ExpectedOption => f.write_str("Expected option"),
Error::ExpectedOptionEnd => f.write_str("Expected closing `)`"),
Error::ExpectedMap => f.write_str("Expected opening `{`"),
Error::ExpectedMapColon => f.write_str("Expected colon"),
Error::ExpectedMapEnd => f.write_str("Expected closing `}`"),
Error::ExpectedDifferentStructName {
expected,
ref found,
} => write!(
f,
"Expected struct {} but found {}",
Identifier(expected),
Identifier(found)
),
Error::ExpectedStructLike => f.write_str("Expected opening `(`"),
Error::ExpectedNamedStructLike(name) => {
if name.is_empty() {
f.write_str("Expected only opening `(`, no name, for un-nameable struct")
} else {
write!(f, "Expected opening `(` for struct {}", Identifier(name))
}
}
Error::ExpectedStructLikeEnd => f.write_str("Expected closing `)`"),
Error::ExpectedUnit => f.write_str("Expected unit"),
Error::ExpectedString => f.write_str("Expected string"),
Error::ExpectedStringEnd => f.write_str("Expected end of string"),
Error::ExpectedIdentifier => f.write_str("Expected identifier"),
Error::InvalidEscape(s) => f.write_str(s),
Error::IntegerOutOfBounds => f.write_str("Integer is out of bounds"),
Error::NoSuchExtension(ref name) => {
write!(f, "No RON extension named {}", Identifier(name))
}
Error::Utf8Error(ref e) => fmt::Display::fmt(e, f),
Error::UnclosedBlockComment => f.write_str("Unclosed block comment"),
Error::UnderscoreAtBeginning => {
f.write_str("Unexpected leading underscore in an integer")
}
Error::UnexpectedByte(ref byte) => write!(f, "Unexpected byte {:?}", byte),
Error::TrailingCharacters => f.write_str("Non-whitespace trailing characters"),
Error::InvalidValueForType {
ref expected,
ref found,
} => {
write!(f, "Expected {} but found {} instead", expected, found)
}
Error::ExpectedDifferentLength {
ref expected,
found,
} => {
write!(f, "Expected {} but found ", expected)?;
match found {
0 => f.write_str("zero elements")?,
1 => f.write_str("one element")?,
n => write!(f, "{} elements", n)?,
}
f.write_str(" instead")
}
Error::NoSuchEnumVariant {
expected,
ref found,
ref outer,
} => {
f.write_str("Unexpected ")?;
if outer.is_none() {
f.write_str("enum ")?;
}
write!(f, "variant named {}", Identifier(found))?;
if let Some(outer) = outer {
write!(f, "in enum {}", Identifier(outer))?;
}
write!(
f,
", {}",
OneOf {
alts: expected,
none: "variants"
}
)
}
Error::NoSuchStructField {
expected,
ref found,
ref outer,
} => {
write!(f, "Unexpected field named {}", Identifier(found))?;
if let Some(outer) = outer {
write!(f, "in {}", Identifier(outer))?;
}
write!(
f,
", {}",
OneOf {
alts: expected,
none: "fields"
}
)
}
Error::MissingStructField { field, ref outer } => {
write!(f, "Unexpected missing field {}", Identifier(field))?;
match outer {
Some(outer) => write!(f, " in {}", Identifier(outer)),
None => Ok(()),
}
}
Error::DuplicateStructField { field, ref outer } => {
write!(f, "Unexpected duplicate field {}", Identifier(field))?;
match outer {
Some(outer) => write!(f, " in {}", Identifier(outer)),
None => Ok(()),
}
}
Error::InvalidIdentifier(ref invalid) => write!(f, "Invalid identifier {:?}", invalid),
Error::SuggestRawIdentifier(ref identifier) => write!(
f,
"Found invalid std identifier `{}`, try the raw identifier `r#{}` instead",
identifier, identifier
),
Error::ExceededRecursionLimit => f.write_str("Exceeded recursion limit, try increasing the limit and using `serde_stacker` to protect against a stack overflow"),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct Position {
pub line: usize,
pub col: usize,
}
impl fmt::Display for Position {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}:{}", self.line, self.col)
}
}
impl ser::Error for Error {
#[cold]
fn custom<T: fmt::Display>(msg: T) -> Self {
Error::Message(msg.to_string())
}
}
impl de::Error for Error {
#[cold]
fn custom<T: fmt::Display>(msg: T) -> Self {
Error::Message(msg.to_string())
}
#[cold]
fn invalid_type(unexp: de::Unexpected, exp: &dyn de::Expected) -> Self {
// Invalid type and invalid value are merged given their similarity in ron
Self::invalid_value(unexp, exp)
}
#[cold]
fn invalid_value(unexp: de::Unexpected, exp: &dyn de::Expected) -> Self {
struct UnexpectedSerdeTypeValue<'a>(de::Unexpected<'a>);
impl<'a> fmt::Display for UnexpectedSerdeTypeValue<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use de::Unexpected::*;
match self.0 {
Bool(b) => write!(f, "the boolean `{}`", b),
Unsigned(i) => write!(f, "the unsigned integer `{}`", i),
Signed(i) => write!(f, "the signed integer `{}`", i),
Float(n) => write!(f, "the floating point number `{}`", n),
Char(c) => write!(f, "the UTF-8 character `{}`", c),
Str(s) => write!(f, "the string {:?}", s),
Bytes(b) => write!(f, "the bytes \"{}\"", {
base64::display::Base64Display::new(b, &BASE64_ENGINE)
}),
Unit => write!(f, "a unit value"),
Option => write!(f, "an optional value"),
NewtypeStruct => write!(f, "a newtype struct"),
Seq => write!(f, "a sequence"),
Map => write!(f, "a map"),
Enum => write!(f, "an enum"),
UnitVariant => write!(f, "a unit variant"),
NewtypeVariant => write!(f, "a newtype variant"),
TupleVariant => write!(f, "a tuple variant"),
StructVariant => write!(f, "a struct variant"),
Other(other) => f.write_str(other),
}
}
}
Error::InvalidValueForType {
expected: exp.to_string(),
found: UnexpectedSerdeTypeValue(unexp).to_string(),
}
}
#[cold]
fn invalid_length(len: usize, exp: &dyn de::Expected) -> Self {
Error::ExpectedDifferentLength {
expected: exp.to_string(),
found: len,
}
}
#[cold]
fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self {
Error::NoSuchEnumVariant {
expected,
found: variant.to_string(),
outer: None,
}
}
#[cold]
fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self {
Error::NoSuchStructField {
expected,
found: field.to_string(),
outer: None,
}
}
#[cold]
fn missing_field(field: &'static str) -> Self {
Error::MissingStructField { field, outer: None }
}
#[cold]
fn duplicate_field(field: &'static str) -> Self {
Error::DuplicateStructField { field, outer: None }
}
}
impl StdError for SpannedError {}
impl StdError for Error {}
impl From<Utf8Error> for Error {
fn from(e: Utf8Error) -> Self {
Error::Utf8Error(e)
}
}
impl From<FromUtf8Error> for Error {
fn from(e: FromUtf8Error) -> Self {
Error::Utf8Error(e.utf8_error())
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Error::Io(e.to_string())
}
}
impl From<io::Error> for SpannedError {
fn from(e: io::Error) -> Self {
SpannedError {
code: e.into(),
position: Position { line: 0, col: 0 },
}
}
}
impl From<SpannedError> for Error {
fn from(e: SpannedError) -> Self {
e.code
}
}
struct OneOf {
alts: &'static [&'static str],
none: &'static str,
}
impl fmt::Display for OneOf {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.alts {
[] => write!(f, "there are no {}", self.none),
[a1] => write!(f, "expected {} instead", Identifier(a1)),
[a1, a2] => write!(
f,
"expected either {} or {} instead",
Identifier(a1),
Identifier(a2)
),
[a1, ref alts @ ..] => {
write!(f, "expected one of {}", Identifier(a1))?;
for alt in alts {
write!(f, ", {}", Identifier(alt))?;
}
f.write_str(" instead")
}
}
}
}
struct Identifier<'a>(&'a str);
impl<'a> fmt::Display for Identifier<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.0.is_empty() || !self.0.as_bytes().iter().copied().all(is_ident_raw_char) {
return write!(f, "{:?}_[invalid identifier]", self.0);
}
let mut bytes = self.0.as_bytes().iter().copied();
if !bytes.next().map_or(false, is_ident_first_char) || !bytes.all(is_ident_other_char) {
write!(f, "`r#{}`", self.0)
} else {
write!(f, "`{}`", self.0)
}
}
}