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// Copyright 2018 the SVG Types Authors
// SPDX-License-Identifier: Apache-2.0 OR MIT
use alloc::string::String;
use alloc::vec;
use alloc::vec::Vec;
/// List of all errors.
#[derive(Debug, PartialEq, Eq)]
pub enum Error {
/// An input data ended earlier than expected.
///
/// Should only appear on invalid input data.
/// Errors in a valid XML should be handled by errors below.
UnexpectedEndOfStream,
/// An input text contains unknown data.
UnexpectedData(usize),
/// A provided string doesn't have a valid data.
///
/// For example, if we try to parse a color form `zzz`
/// string - we will get this error.
/// But if we try to parse a number list like `1.2 zzz`,
/// then we will get `InvalidNumber`, because at least some data is valid.
InvalidValue,
/// An invalid ident.
///
/// CSS idents have certain rules with regard to the characters they may contain.
/// For example, they may not start with a number. If an invalid ident is encountered,
/// this error will be returned.
InvalidIdent,
/// An invalid/unexpected character.
///
/// The first byte is an actual one, others - expected.
///
/// We are using a single value to reduce the struct size.
InvalidChar(Vec<u8>, usize),
/// An unexpected character instead of an XML space.
///
/// The first string is an actual one, others - expected.
///
/// We are using a single value to reduce the struct size.
InvalidString(Vec<String>, usize),
/// An invalid number.
InvalidNumber(usize),
}
impl core::fmt::Display for Error {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
match *self {
Self::UnexpectedEndOfStream => {
write!(f, "unexpected end of stream")
}
Self::UnexpectedData(pos) => {
write!(f, "unexpected data at position {pos}")
}
Self::InvalidValue => {
write!(f, "invalid value")
}
Self::InvalidIdent => {
write!(f, "invalid ident")
}
Self::InvalidChar(ref chars, pos) => {
// Vec<u8> -> Vec<String>
let list: Vec<String> = chars
.iter()
.skip(1)
.map(|c| String::from_utf8(vec![*c]).unwrap())
.collect();
write!(
f,
"expected '{}' not '{}' at position {}",
list.join("', '"),
chars[0] as char,
pos
)
}
Self::InvalidString(ref strings, pos) => {
write!(
f,
"expected '{}' not '{}' at position {}",
strings[1..].join("', '"),
strings[0],
pos
)
}
Self::InvalidNumber(pos) => {
write!(f, "invalid number at position {pos}")
}
}
}
}
impl core::error::Error for Error {
fn description(&self) -> &str {
"an SVG data parsing error"
}
}