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445 lines
14 KiB
445 lines
14 KiB
//! When serializing or deserializing JSON goes wrong.
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use crate::io;
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use alloc::boxed::Box;
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use alloc::string::{String, ToString};
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use core::fmt::{self, Debug, Display};
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use core::result;
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use core::str::FromStr;
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use serde::{de, ser};
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#[cfg(feature = "std")]
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use std::error;
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/// This type represents all possible errors that can occur when serializing or
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/// deserializing JSON data.
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pub struct Error {
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/// This `Box` allows us to keep the size of `Error` as small as possible. A
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/// larger `Error` type was substantially slower due to all the functions
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/// that pass around `Result<T, Error>`.
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err: Box<ErrorImpl>,
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}
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/// Alias for a `Result` with the error type `serde_json::Error`.
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pub type Result<T> = result::Result<T, Error>;
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impl Error {
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/// One-based line number at which the error was detected.
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///
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/// Characters in the first line of the input (before the first newline
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/// character) are in line 1.
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pub fn line(&self) -> usize {
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self.err.line
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}
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/// One-based column number at which the error was detected.
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///
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/// The first character in the input and any characters immediately
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/// following a newline character are in column 1.
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///
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/// Note that errors may occur in column 0, for example if a read from an IO
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/// stream fails immediately following a previously read newline character.
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pub fn column(&self) -> usize {
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self.err.column
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}
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/// Categorizes the cause of this error.
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///
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/// - `Category::Io` - failure to read or write bytes on an IO stream
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/// - `Category::Syntax` - input that is not syntactically valid JSON
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/// - `Category::Data` - input data that is semantically incorrect
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/// - `Category::Eof` - unexpected end of the input data
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pub fn classify(&self) -> Category {
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match self.err.code {
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ErrorCode::Message(_) => Category::Data,
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ErrorCode::Io(_) => Category::Io,
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ErrorCode::EofWhileParsingList
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| ErrorCode::EofWhileParsingObject
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| ErrorCode::EofWhileParsingString
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| ErrorCode::EofWhileParsingValue => Category::Eof,
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ErrorCode::ExpectedColon
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| ErrorCode::ExpectedListCommaOrEnd
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| ErrorCode::ExpectedObjectCommaOrEnd
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| ErrorCode::ExpectedSomeIdent
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| ErrorCode::ExpectedSomeValue
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| ErrorCode::InvalidEscape
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| ErrorCode::InvalidNumber
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| ErrorCode::NumberOutOfRange
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| ErrorCode::InvalidUnicodeCodePoint
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| ErrorCode::ControlCharacterWhileParsingString
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| ErrorCode::KeyMustBeAString
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| ErrorCode::LoneLeadingSurrogateInHexEscape
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| ErrorCode::TrailingComma
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| ErrorCode::TrailingCharacters
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| ErrorCode::UnexpectedEndOfHexEscape
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| ErrorCode::RecursionLimitExceeded => Category::Syntax,
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}
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}
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/// Returns true if this error was caused by a failure to read or write
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/// bytes on an IO stream.
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pub fn is_io(&self) -> bool {
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self.classify() == Category::Io
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}
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/// Returns true if this error was caused by input that was not
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/// syntactically valid JSON.
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pub fn is_syntax(&self) -> bool {
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self.classify() == Category::Syntax
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}
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/// Returns true if this error was caused by input data that was
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/// semantically incorrect.
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///
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/// For example, JSON containing a number is semantically incorrect when the
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/// type being deserialized into holds a String.
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pub fn is_data(&self) -> bool {
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self.classify() == Category::Data
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}
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/// Returns true if this error was caused by prematurely reaching the end of
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/// the input data.
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///
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/// Callers that process streaming input may be interested in retrying the
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/// deserialization once more data is available.
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pub fn is_eof(&self) -> bool {
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self.classify() == Category::Eof
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}
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}
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/// Categorizes the cause of a `serde_json::Error`.
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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pub enum Category {
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/// The error was caused by a failure to read or write bytes on an IO
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/// stream.
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Io,
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/// The error was caused by input that was not syntactically valid JSON.
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Syntax,
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/// The error was caused by input data that was semantically incorrect.
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///
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/// For example, JSON containing a number is semantically incorrect when the
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/// type being deserialized into holds a String.
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Data,
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/// The error was caused by prematurely reaching the end of the input data.
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///
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/// Callers that process streaming input may be interested in retrying the
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/// deserialization once more data is available.
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Eof,
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}
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#[cfg(feature = "std")]
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#[allow(clippy::fallible_impl_from)]
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impl From<Error> for io::Error {
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/// Convert a `serde_json::Error` into an `io::Error`.
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///
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/// JSON syntax and data errors are turned into `InvalidData` IO errors.
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/// EOF errors are turned into `UnexpectedEof` IO errors.
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///
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/// ```
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/// use std::io;
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///
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/// enum MyError {
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/// Io(io::Error),
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/// Json(serde_json::Error),
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/// }
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///
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/// impl From<serde_json::Error> for MyError {
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/// fn from(err: serde_json::Error) -> MyError {
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/// use serde_json::error::Category;
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/// match err.classify() {
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/// Category::Io => {
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/// MyError::Io(err.into())
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/// }
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/// Category::Syntax | Category::Data | Category::Eof => {
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/// MyError::Json(err)
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/// }
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/// }
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/// }
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/// }
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/// ```
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fn from(j: Error) -> Self {
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if let ErrorCode::Io(err) = j.err.code {
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err
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} else {
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match j.classify() {
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Category::Io => unreachable!(),
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Category::Syntax | Category::Data => io::Error::new(io::ErrorKind::InvalidData, j),
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Category::Eof => io::Error::new(io::ErrorKind::UnexpectedEof, j),
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}
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}
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}
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}
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struct ErrorImpl {
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code: ErrorCode,
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line: usize,
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column: usize,
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}
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pub(crate) enum ErrorCode {
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/// Catchall for syntax error messages
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Message(Box<str>),
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/// Some IO error occurred while serializing or deserializing.
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Io(io::Error),
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/// EOF while parsing a list.
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EofWhileParsingList,
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/// EOF while parsing an object.
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EofWhileParsingObject,
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/// EOF while parsing a string.
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EofWhileParsingString,
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/// EOF while parsing a JSON value.
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EofWhileParsingValue,
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/// Expected this character to be a `':'`.
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ExpectedColon,
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/// Expected this character to be either a `','` or a `']'`.
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ExpectedListCommaOrEnd,
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/// Expected this character to be either a `','` or a `'}'`.
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ExpectedObjectCommaOrEnd,
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/// Expected to parse either a `true`, `false`, or a `null`.
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ExpectedSomeIdent,
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/// Expected this character to start a JSON value.
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ExpectedSomeValue,
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/// Invalid hex escape code.
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InvalidEscape,
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/// Invalid number.
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InvalidNumber,
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/// Number is bigger than the maximum value of its type.
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NumberOutOfRange,
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/// Invalid unicode code point.
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InvalidUnicodeCodePoint,
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/// Control character found while parsing a string.
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ControlCharacterWhileParsingString,
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/// Object key is not a string.
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KeyMustBeAString,
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/// Lone leading surrogate in hex escape.
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LoneLeadingSurrogateInHexEscape,
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/// JSON has a comma after the last value in an array or map.
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TrailingComma,
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/// JSON has non-whitespace trailing characters after the value.
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TrailingCharacters,
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/// Unexpected end of hex escape.
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UnexpectedEndOfHexEscape,
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/// Encountered nesting of JSON maps and arrays more than 128 layers deep.
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RecursionLimitExceeded,
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}
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impl Error {
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#[cold]
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pub(crate) fn syntax(code: ErrorCode, line: usize, column: usize) -> Self {
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Error {
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err: Box::new(ErrorImpl { code, line, column }),
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}
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}
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// Not public API. Should be pub(crate).
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//
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// Update `eager_json` crate when this function changes.
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#[doc(hidden)]
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#[cold]
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pub fn io(error: io::Error) -> Self {
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Error {
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err: Box::new(ErrorImpl {
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code: ErrorCode::Io(error),
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line: 0,
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column: 0,
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}),
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}
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}
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#[cold]
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pub(crate) fn fix_position<F>(self, f: F) -> Self
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where
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F: FnOnce(ErrorCode) -> Error,
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{
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if self.err.line == 0 {
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f(self.err.code)
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} else {
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self
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}
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}
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}
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impl Display for ErrorCode {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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ErrorCode::Message(msg) => f.write_str(msg),
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ErrorCode::Io(err) => Display::fmt(err, f),
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ErrorCode::EofWhileParsingList => f.write_str("EOF while parsing a list"),
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ErrorCode::EofWhileParsingObject => f.write_str("EOF while parsing an object"),
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ErrorCode::EofWhileParsingString => f.write_str("EOF while parsing a string"),
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ErrorCode::EofWhileParsingValue => f.write_str("EOF while parsing a value"),
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ErrorCode::ExpectedColon => f.write_str("expected `:`"),
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ErrorCode::ExpectedListCommaOrEnd => f.write_str("expected `,` or `]`"),
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ErrorCode::ExpectedObjectCommaOrEnd => f.write_str("expected `,` or `}`"),
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ErrorCode::ExpectedSomeIdent => f.write_str("expected ident"),
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ErrorCode::ExpectedSomeValue => f.write_str("expected value"),
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ErrorCode::InvalidEscape => f.write_str("invalid escape"),
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ErrorCode::InvalidNumber => f.write_str("invalid number"),
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ErrorCode::NumberOutOfRange => f.write_str("number out of range"),
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ErrorCode::InvalidUnicodeCodePoint => f.write_str("invalid unicode code point"),
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ErrorCode::ControlCharacterWhileParsingString => {
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f.write_str("control character (\\u0000-\\u001F) found while parsing a string")
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}
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ErrorCode::KeyMustBeAString => f.write_str("key must be a string"),
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ErrorCode::LoneLeadingSurrogateInHexEscape => {
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f.write_str("lone leading surrogate in hex escape")
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}
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ErrorCode::TrailingComma => f.write_str("trailing comma"),
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ErrorCode::TrailingCharacters => f.write_str("trailing characters"),
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ErrorCode::UnexpectedEndOfHexEscape => f.write_str("unexpected end of hex escape"),
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ErrorCode::RecursionLimitExceeded => f.write_str("recursion limit exceeded"),
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}
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}
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}
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impl serde::de::StdError for Error {
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#[cfg(feature = "std")]
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fn source(&self) -> Option<&(dyn error::Error + 'static)> {
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match &self.err.code {
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ErrorCode::Io(err) => err.source(),
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_ => None,
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}
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}
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}
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impl Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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Display::fmt(&*self.err, f)
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}
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}
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impl Display for ErrorImpl {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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if self.line == 0 {
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Display::fmt(&self.code, f)
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} else {
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write!(
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f,
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"{} at line {} column {}",
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self.code, self.line, self.column
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)
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}
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}
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}
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// Remove two layers of verbosity from the debug representation. Humans often
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// end up seeing this representation because it is what unwrap() shows.
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impl Debug for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(
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f,
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"Error({:?}, line: {}, column: {})",
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self.err.code.to_string(),
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self.err.line,
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self.err.column
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)
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}
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}
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impl de::Error for Error {
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#[cold]
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fn custom<T: Display>(msg: T) -> Error {
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make_error(msg.to_string())
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}
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#[cold]
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fn invalid_type(unexp: de::Unexpected, exp: &dyn de::Expected) -> Self {
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if let de::Unexpected::Unit = unexp {
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Error::custom(format_args!("invalid type: null, expected {}", exp))
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} else {
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Error::custom(format_args!("invalid type: {}, expected {}", unexp, exp))
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}
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}
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}
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impl ser::Error for Error {
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#[cold]
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fn custom<T: Display>(msg: T) -> Error {
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make_error(msg.to_string())
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}
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}
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// Parse our own error message that looks like "{} at line {} column {}" to work
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// around erased-serde round-tripping the error through de::Error::custom.
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fn make_error(mut msg: String) -> Error {
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let (line, column) = parse_line_col(&mut msg).unwrap_or((0, 0));
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Error {
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err: Box::new(ErrorImpl {
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code: ErrorCode::Message(msg.into_boxed_str()),
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line,
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column,
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}),
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}
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}
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fn parse_line_col(msg: &mut String) -> Option<(usize, usize)> {
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let start_of_suffix = match msg.rfind(" at line ") {
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Some(index) => index,
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None => return None,
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};
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// Find start and end of line number.
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let start_of_line = start_of_suffix + " at line ".len();
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let mut end_of_line = start_of_line;
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while starts_with_digit(&msg[end_of_line..]) {
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end_of_line += 1;
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}
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if !msg[end_of_line..].starts_with(" column ") {
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return None;
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}
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// Find start and end of column number.
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let start_of_column = end_of_line + " column ".len();
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let mut end_of_column = start_of_column;
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while starts_with_digit(&msg[end_of_column..]) {
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end_of_column += 1;
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}
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if end_of_column < msg.len() {
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return None;
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}
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// Parse numbers.
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let line = match usize::from_str(&msg[start_of_line..end_of_line]) {
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Ok(line) => line,
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Err(_) => return None,
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};
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let column = match usize::from_str(&msg[start_of_column..end_of_column]) {
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Ok(column) => column,
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Err(_) => return None,
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};
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msg.truncate(start_of_suffix);
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Some((line, column))
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}
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fn starts_with_digit(slice: &str) -> bool {
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match slice.as_bytes().first() {
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None => false,
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Some(&byte) => byte >= b'0' && byte <= b'9',
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}
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}
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