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Merge #1584

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1584: switch to upstream unescape r=matklad a=matklad



Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
This commit is contained in:
bors[bot] 2019-07-24 09:03:26 +00:00
commit bf3030404e
4 changed files with 91 additions and 529 deletions
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6
Cargo.lock generated
View File

@ -1310,7 +1310,7 @@ dependencies = [
[[package]]
name = "ra_rustc_lexer"
version = "0.1.0-pre.1"
version = "0.1.0-pre.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@ -1322,7 +1322,7 @@ version = "0.1.0"
dependencies = [
"itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
"ra_parser 0.1.0",
"ra_rustc_lexer 0.1.0-pre.1 (registry+https://github.com/rust-lang/crates.io-index)",
"ra_rustc_lexer 0.1.0-pre.2 (registry+https://github.com/rust-lang/crates.io-index)",
"ra_text_edit 0.1.0",
"rowan 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
"smol_str 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
@ -2259,7 +2259,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum proptest 0.9.4 (registry+https://github.com/rust-lang/crates.io-index)" = "cf147e022eacf0c8a054ab864914a7602618adba841d800a9a9868a5237a529f"
"checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
"checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
"checksum ra_rustc_lexer 0.1.0-pre.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e8d92772f822978a6c9c4657aa61af439e4e635180628b3354049b283b749f1e"
"checksum ra_rustc_lexer 0.1.0-pre.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6baccda91574dfadd7f8a0bc8f9f110f874b6b484289b2536d3dbf4f0d5d97bb"
"checksum ra_vfs 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "fb7cd4e302032c5ab514f1c01c89727cd96fd950dd36f9ebee9252df45d9fb1a"
"checksum rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
"checksum rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d47eab0e83d9693d40f825f86948aa16eff6750ead4bdffc4ab95b8b3a7f052c"

2
crates/ra_syntax/Cargo.toml
View File

@ -11,7 +11,7 @@ repository = "https://github.com/rust-analyzer/rust-analyzer"
unicode-xid = "0.1.0"
itertools = "0.8.0"
rowan = "0.6.0"
ra_rustc_lexer = { version = "0.1.0-pre.1", features = [ "unicode-xid" ] }
ra_rustc_lexer = { version = "0.1.0-pre.2" }
# ideally, `serde` should be enabled by `ra_lsp_server`, but we enable it here
# to reduce number of compilations

91
crates/ra_syntax/src/validation.rs
View File

@ -1,16 +1,99 @@
mod unescape;
mod block;
mod field_expr;
use ra_rustc_lexer::unescape;
use crate::{
algo::visit::{visitor_ctx, VisitorCtx},
ast, SyntaxError,
ast, SyntaxError, SyntaxErrorKind,
SyntaxKind::{BYTE, BYTE_STRING, CHAR, STRING},
SyntaxNode, TextUnit, T,
};
pub(crate) use unescape::EscapeError;
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum EscapeError {
ZeroChars,
MoreThanOneChar,
LoneSlash,
InvalidEscape,
BareCarriageReturn,
EscapeOnlyChar,
TooShortHexEscape,
InvalidCharInHexEscape,
OutOfRangeHexEscape,
NoBraceInUnicodeEscape,
InvalidCharInUnicodeEscape,
EmptyUnicodeEscape,
UnclosedUnicodeEscape,
LeadingUnderscoreUnicodeEscape,
OverlongUnicodeEscape,
LoneSurrogateUnicodeEscape,
OutOfRangeUnicodeEscape,
UnicodeEscapeInByte,
NonAsciiCharInByte,
}
impl From<ra_rustc_lexer::unescape::EscapeError> for EscapeError {
fn from(err: ra_rustc_lexer::unescape::EscapeError) -> Self {
match err {
ra_rustc_lexer::unescape::EscapeError::ZeroChars => EscapeError::ZeroChars,
ra_rustc_lexer::unescape::EscapeError::MoreThanOneChar => EscapeError::MoreThanOneChar,
ra_rustc_lexer::unescape::EscapeError::LoneSlash => EscapeError::LoneSlash,
ra_rustc_lexer::unescape::EscapeError::InvalidEscape => EscapeError::InvalidEscape,
ra_rustc_lexer::unescape::EscapeError::BareCarriageReturn
| ra_rustc_lexer::unescape::EscapeError::BareCarriageReturnInRawString => {
EscapeError::BareCarriageReturn
}
ra_rustc_lexer::unescape::EscapeError::EscapeOnlyChar => EscapeError::EscapeOnlyChar,
ra_rustc_lexer::unescape::EscapeError::TooShortHexEscape => {
EscapeError::TooShortHexEscape
}
ra_rustc_lexer::unescape::EscapeError::InvalidCharInHexEscape => {
EscapeError::InvalidCharInHexEscape
}
ra_rustc_lexer::unescape::EscapeError::OutOfRangeHexEscape => {
EscapeError::OutOfRangeHexEscape
}
ra_rustc_lexer::unescape::EscapeError::NoBraceInUnicodeEscape => {
EscapeError::NoBraceInUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::InvalidCharInUnicodeEscape => {
EscapeError::InvalidCharInUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::EmptyUnicodeEscape => {
EscapeError::EmptyUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::UnclosedUnicodeEscape => {
EscapeError::UnclosedUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::LeadingUnderscoreUnicodeEscape => {
EscapeError::LeadingUnderscoreUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::OverlongUnicodeEscape => {
EscapeError::OverlongUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::LoneSurrogateUnicodeEscape => {
EscapeError::LoneSurrogateUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::OutOfRangeUnicodeEscape => {
EscapeError::OutOfRangeUnicodeEscape
}
ra_rustc_lexer::unescape::EscapeError::UnicodeEscapeInByte => {
EscapeError::UnicodeEscapeInByte
}
ra_rustc_lexer::unescape::EscapeError::NonAsciiCharInByte
| ra_rustc_lexer::unescape::EscapeError::NonAsciiCharInByteString => {
EscapeError::NonAsciiCharInByte
}
}
}
}
impl From<ra_rustc_lexer::unescape::EscapeError> for SyntaxErrorKind {
fn from(err: ra_rustc_lexer::unescape::EscapeError) -> Self {
SyntaxErrorKind::EscapeError(err.into())
}
}
pub(crate) fn validate(root: &SyntaxNode) -> Vec<SyntaxError> {
let mut errors = Vec::new();

521
crates/ra_syntax/src/validation/unescape.rs
View File

@ -1,521 +0,0 @@
//! Utilities for validating string and char literals and turning them into
//! values they represent.
//!
//! This file is copy-pasted from the compiler
//!
//! https://github.com/rust-lang/rust/blob/c6ac57564852cb6e2d0db60f7b46d9eb98d4b449/src/libsyntax/parse/unescape.rs
//!
//! Hopefully, we'll share this code in a proper way some day
use std::ops::Range;
use std::str::Chars;
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
pub enum EscapeError {
ZeroChars,
MoreThanOneChar,
LoneSlash,
InvalidEscape,
BareCarriageReturn,
EscapeOnlyChar,
TooShortHexEscape,
InvalidCharInHexEscape,
OutOfRangeHexEscape,
NoBraceInUnicodeEscape,
InvalidCharInUnicodeEscape,
EmptyUnicodeEscape,
UnclosedUnicodeEscape,
LeadingUnderscoreUnicodeEscape,
OverlongUnicodeEscape,
LoneSurrogateUnicodeEscape,
OutOfRangeUnicodeEscape,
UnicodeEscapeInByte,
NonAsciiCharInByte,
}
/// Takes a contents of a char literal (without quotes), and returns an
/// unescaped char or an error
pub(crate) fn unescape_char(literal_text: &str) -> Result<char, (usize, EscapeError)> {
let mut chars = literal_text.chars();
unescape_char_or_byte(&mut chars, Mode::Char)
.map_err(|err| (literal_text.len() - chars.as_str().len(), err))
}
/// Takes a contents of a string literal (without quotes) and produces a
/// sequence of escaped characters or errors.
pub(crate) fn unescape_str<F>(literal_text: &str, callback: &mut F)
where
F: FnMut(Range<usize>, Result<char, EscapeError>),
{
unescape_str_or_byte_str(literal_text, Mode::Str, callback)
}
pub(crate) fn unescape_byte(literal_text: &str) -> Result<u8, (usize, EscapeError)> {
let mut chars = literal_text.chars();
unescape_char_or_byte(&mut chars, Mode::Byte)
.map(byte_from_char)
.map_err(|err| (literal_text.len() - chars.as_str().len(), err))
}
/// Takes a contents of a string literal (without quotes) and produces a
/// sequence of escaped characters or errors.
pub(crate) fn unescape_byte_str<F>(literal_text: &str, callback: &mut F)
where
F: FnMut(Range<usize>, Result<u8, EscapeError>),
{
unescape_str_or_byte_str(literal_text, Mode::ByteStr, &mut |range, char| {
callback(range, char.map(byte_from_char))
})
}
#[derive(Debug, Clone, Copy)]
pub(crate) enum Mode {
Char,
Str,
Byte,
ByteStr,
}
impl Mode {
fn in_single_quotes(self) -> bool {
match self {
Mode::Char | Mode::Byte => true,
Mode::Str | Mode::ByteStr => false,
}
}
pub(crate) fn in_double_quotes(self) -> bool {
!self.in_single_quotes()
}
pub(crate) fn is_bytes(self) -> bool {
match self {
Mode::Byte | Mode::ByteStr => true,
Mode::Char | Mode::Str => false,
}
}
}
fn scan_escape(first_char: char, chars: &mut Chars<'_>, mode: Mode) -> Result<char, EscapeError> {
if first_char != '\\' {
return match first_char {
'\t' | '\n' => Err(EscapeError::EscapeOnlyChar),
'\r' => Err(if chars.clone().next() == Some('\n') {
EscapeError::EscapeOnlyChar
} else {
EscapeError::BareCarriageReturn
}),
'\'' if mode.in_single_quotes() => Err(EscapeError::EscapeOnlyChar),
'"' if mode.in_double_quotes() => Err(EscapeError::EscapeOnlyChar),
_ => {
if mode.is_bytes() && !first_char.is_ascii() {
return Err(EscapeError::NonAsciiCharInByte);
}
Ok(first_char)
}
};
}
let second_char = chars.next().ok_or(EscapeError::LoneSlash)?;
let res = match second_char {
'"' => '"',
'n' => '\n',
'r' => '\r',
't' => '\t',
'\\' => '\\',
'\'' => '\'',
'0' => '\0',
'x' => {
let hi = chars.next().ok_or(EscapeError::TooShortHexEscape)?;
let hi = hi.to_digit(16).ok_or(EscapeError::InvalidCharInHexEscape)?;
let lo = chars.next().ok_or(EscapeError::TooShortHexEscape)?;
let lo = lo.to_digit(16).ok_or(EscapeError::InvalidCharInHexEscape)?;
let value = hi * 16 + lo;
if !mode.is_bytes() && !is_ascii(value) {
return Err(EscapeError::OutOfRangeHexEscape);
}
let value = value as u8;
value as char
}
'u' => {
if chars.next() != Some('{') {
return Err(EscapeError::NoBraceInUnicodeEscape);
}
let mut n_digits = 1;
let mut value: u32 = match chars.next().ok_or(EscapeError::UnclosedUnicodeEscape)? {
'_' => return Err(EscapeError::LeadingUnderscoreUnicodeEscape),
'}' => return Err(EscapeError::EmptyUnicodeEscape),
c => c.to_digit(16).ok_or(EscapeError::InvalidCharInUnicodeEscape)?,
};
loop {
match chars.next() {
None => return Err(EscapeError::UnclosedUnicodeEscape),
Some('_') => continue,
Some('}') => {
if n_digits > 6 {
return Err(EscapeError::OverlongUnicodeEscape);
}
if mode.is_bytes() {
return Err(EscapeError::UnicodeEscapeInByte);
}
break std::char::from_u32(value).ok_or_else(|| {
if value > 0x0010_FFFF {
EscapeError::OutOfRangeUnicodeEscape
} else {
EscapeError::LoneSurrogateUnicodeEscape
}
})?;
}
Some(c) => {
let digit =
c.to_digit(16).ok_or(EscapeError::InvalidCharInUnicodeEscape)?;
n_digits += 1;
if n_digits > 6 {
continue;
}
let digit = digit as u32;
value = value * 16 + digit;
}
};
}
}
_ => return Err(EscapeError::InvalidEscape),
};
Ok(res)
}
fn unescape_char_or_byte(chars: &mut Chars<'_>, mode: Mode) -> Result<char, EscapeError> {
let first_char = chars.next().ok_or(EscapeError::ZeroChars)?;
let res = scan_escape(first_char, chars, mode)?;
if chars.next().is_some() {
return Err(EscapeError::MoreThanOneChar);
}
Ok(res)
}
/// Takes a contents of a string literal (without quotes) and produces a
/// sequence of escaped characters or errors.
fn unescape_str_or_byte_str<F>(src: &str, mode: Mode, callback: &mut F)
where
F: FnMut(Range<usize>, Result<char, EscapeError>),
{
assert!(mode.in_double_quotes());
let initial_len = src.len();
let mut chars = src.chars();
while let Some(first_char) = chars.next() {
let start = initial_len - chars.as_str().len() - first_char.len_utf8();
let unescaped_char = match first_char {
'\\' => {
let (second_char, third_char) = {
let mut chars = chars.clone();
(chars.next(), chars.next())
};
match (second_char, third_char) {
(Some('\n'), _) | (Some('\r'), Some('\n')) => {
skip_ascii_whitespace(&mut chars);
continue;
}
_ => scan_escape(first_char, &mut chars, mode),
}
}
'\r' => {
let second_char = chars.clone().next();
if second_char == Some('\n') {
chars.next();
Ok('\n')
} else {
scan_escape(first_char, &mut chars, mode)
}
}
'\n' => Ok('\n'),
'\t' => Ok('\t'),
_ => scan_escape(first_char, &mut chars, mode),
};
let end = initial_len - chars.as_str().len();
callback(start..end, unescaped_char);
}
fn skip_ascii_whitespace(chars: &mut Chars<'_>) {
let str = chars.as_str();
let first_non_space = str
.bytes()
.position(|b| b != b' ' && b != b'\t' && b != b'\n' && b != b'\r')
.unwrap_or_else(|| str.len());
*chars = str[first_non_space..].chars()
}
}
fn byte_from_char(c: char) -> u8 {
let res = c as u32;
assert!(res <= u32::from(u8::max_value()), "guaranteed because of Mode::Byte");
res as u8
}
fn is_ascii(x: u32) -> bool {
x <= 0x7F
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_unescape_char_bad() {
fn check(literal_text: &str, expected_error: EscapeError) {
let actual_result = unescape_char(literal_text).map_err(|(_offset, err)| err);
assert_eq!(actual_result, Err(expected_error));
}
check("", EscapeError::ZeroChars);
check(r"\", EscapeError::LoneSlash);
check("\n", EscapeError::EscapeOnlyChar);
check("\r\n", EscapeError::EscapeOnlyChar);
check("\t", EscapeError::EscapeOnlyChar);
check("'", EscapeError::EscapeOnlyChar);
check("\r", EscapeError::BareCarriageReturn);
check("spam", EscapeError::MoreThanOneChar);
check(r"\x0ff", EscapeError::MoreThanOneChar);
check(r#"\"a"#, EscapeError::MoreThanOneChar);
check(r"\na", EscapeError::MoreThanOneChar);
check(r"\ra", EscapeError::MoreThanOneChar);
check(r"\ta", EscapeError::MoreThanOneChar);
check(r"\\a", EscapeError::MoreThanOneChar);
check(r"\'a", EscapeError::MoreThanOneChar);
check(r"\0a", EscapeError::MoreThanOneChar);
check(r"\u{0}x", EscapeError::MoreThanOneChar);
check(r"\u{1F63b}}", EscapeError::MoreThanOneChar);
check(r"\v", EscapeError::InvalidEscape);
check(r"\💩", EscapeError::InvalidEscape);
check(r"\●", EscapeError::InvalidEscape);
check(r"\x", EscapeError::TooShortHexEscape);
check(r"\x0", EscapeError::TooShortHexEscape);
check(r"\xf", EscapeError::TooShortHexEscape);
check(r"\xa", EscapeError::TooShortHexEscape);
check(r"\xx", EscapeError::InvalidCharInHexEscape);
check(r"\xы", EscapeError::InvalidCharInHexEscape);
check(r"\x🦀", EscapeError::InvalidCharInHexEscape);
check(r"\xtt", EscapeError::InvalidCharInHexEscape);
check(r"\xff", EscapeError::OutOfRangeHexEscape);
check(r"\xFF", EscapeError::OutOfRangeHexEscape);
check(r"\x80", EscapeError::OutOfRangeHexEscape);
check(r"\u", EscapeError::NoBraceInUnicodeEscape);
check(r"\u[0123]", EscapeError::NoBraceInUnicodeEscape);
check(r"\u{0x}", EscapeError::InvalidCharInUnicodeEscape);
check(r"\u{", EscapeError::UnclosedUnicodeEscape);
check(r"\u{0000", EscapeError::UnclosedUnicodeEscape);
check(r"\u{}", EscapeError::EmptyUnicodeEscape);
check(r"\u{_0000}", EscapeError::LeadingUnderscoreUnicodeEscape);
check(r"\u{0000000}", EscapeError::OverlongUnicodeEscape);
check(r"\u{FFFFFF}", EscapeError::OutOfRangeUnicodeEscape);
check(r"\u{ffffff}", EscapeError::OutOfRangeUnicodeEscape);
check(r"\u{ffffff}", EscapeError::OutOfRangeUnicodeEscape);
check(r"\u{DC00}", EscapeError::LoneSurrogateUnicodeEscape);
check(r"\u{DDDD}", EscapeError::LoneSurrogateUnicodeEscape);
check(r"\u{DFFF}", EscapeError::LoneSurrogateUnicodeEscape);
check(r"\u{D800}", EscapeError::LoneSurrogateUnicodeEscape);
check(r"\u{DAAA}", EscapeError::LoneSurrogateUnicodeEscape);
check(r"\u{DBFF}", EscapeError::LoneSurrogateUnicodeEscape);
}
#[test]
fn test_unescape_char_good() {
fn check(literal_text: &str, expected_char: char) {
let actual_result = unescape_char(literal_text);
assert_eq!(actual_result, Ok(expected_char));
}
check("a", 'a');
check("ы", 'ы');
check("🦀", '🦀');
check(r#"\""#, '"');
check(r"\n", '\n');
check(r"\r", '\r');
check(r"\t", '\t');
check(r"\\", '\\');
check(r"\'", '\'');
check(r"\0", '\0');
check(r"\x00", '\0');
check(r"\x5a", 'Z');
check(r"\x5A", 'Z');
check(r"\x7f", 127 as char);
check(r"\u{0}", '\0');
check(r"\u{000000}", '\0');
check(r"\u{41}", 'A');
check(r"\u{0041}", 'A');
check(r"\u{00_41}", 'A');
check(r"\u{4__1__}", 'A');
check(r"\u{1F63b}", '😻');
}
#[test]
fn test_unescape_str_good() {
fn check(literal_text: &str, expected: &str) {
let mut buf = Ok(String::with_capacity(literal_text.len()));
unescape_str(literal_text, &mut |range, c| {
if let Ok(b) = &mut buf {
match c {
Ok(c) => b.push(c),
Err(e) => buf = Err((range, e)),
}
}
});
let buf = buf.as_ref().map(|it| it.as_ref());
assert_eq!(buf, Ok(expected))
}
check("foo", "foo");
check("", "");
check(" \t\n\r\n", " \t\n\n");
check("hello \\\n world", "hello world");
check("hello \\\r\n world", "hello world");
check("thread's", "thread's")
}
#[test]
fn test_unescape_byte_bad() {
fn check(literal_text: &str, expected_error: EscapeError) {
let actual_result = unescape_byte(literal_text).map_err(|(_offset, err)| err);
assert_eq!(actual_result, Err(expected_error));
}
check("", EscapeError::ZeroChars);
check(r"\", EscapeError::LoneSlash);
check("\n", EscapeError::EscapeOnlyChar);
check("\r\n", EscapeError::EscapeOnlyChar);
check("\t", EscapeError::EscapeOnlyChar);
check("'", EscapeError::EscapeOnlyChar);
check("\r", EscapeError::BareCarriageReturn);
check("spam", EscapeError::MoreThanOneChar);
check(r"\x0ff", EscapeError::MoreThanOneChar);
check(r#"\"a"#, EscapeError::MoreThanOneChar);
check(r"\na", EscapeError::MoreThanOneChar);
check(r"\ra", EscapeError::MoreThanOneChar);
check(r"\ta", EscapeError::MoreThanOneChar);
check(r"\\a", EscapeError::MoreThanOneChar);
check(r"\'a", EscapeError::MoreThanOneChar);
check(r"\0a", EscapeError::MoreThanOneChar);
check(r"\v", EscapeError::InvalidEscape);
check(r"\💩", EscapeError::InvalidEscape);
check(r"\●", EscapeError::InvalidEscape);
check(r"\x", EscapeError::TooShortHexEscape);
check(r"\x0", EscapeError::TooShortHexEscape);
check(r"\xa", EscapeError::TooShortHexEscape);
check(r"\xf", EscapeError::TooShortHexEscape);
check(r"\xx", EscapeError::InvalidCharInHexEscape);
check(r"\xы", EscapeError::InvalidCharInHexEscape);
check(r"\x🦀", EscapeError::InvalidCharInHexEscape);
check(r"\xtt", EscapeError::InvalidCharInHexEscape);
check(r"\u", EscapeError::NoBraceInUnicodeEscape);
check(r"\u[0123]", EscapeError::NoBraceInUnicodeEscape);
check(r"\u{0x}", EscapeError::InvalidCharInUnicodeEscape);
check(r"\u{", EscapeError::UnclosedUnicodeEscape);
check(r"\u{0000", EscapeError::UnclosedUnicodeEscape);
check(r"\u{}", EscapeError::EmptyUnicodeEscape);
check(r"\u{_0000}", EscapeError::LeadingUnderscoreUnicodeEscape);
check(r"\u{0000000}", EscapeError::OverlongUnicodeEscape);
check("ы", EscapeError::NonAsciiCharInByte);
check("🦀", EscapeError::NonAsciiCharInByte);
check(r"\u{0}", EscapeError::UnicodeEscapeInByte);
check(r"\u{000000}", EscapeError::UnicodeEscapeInByte);
check(r"\u{41}", EscapeError::UnicodeEscapeInByte);
check(r"\u{0041}", EscapeError::UnicodeEscapeInByte);
check(r"\u{00_41}", EscapeError::UnicodeEscapeInByte);
check(r"\u{4__1__}", EscapeError::UnicodeEscapeInByte);
check(r"\u{1F63b}", EscapeError::UnicodeEscapeInByte);
check(r"\u{0}x", EscapeError::UnicodeEscapeInByte);
check(r"\u{1F63b}}", EscapeError::UnicodeEscapeInByte);
check(r"\u{FFFFFF}", EscapeError::UnicodeEscapeInByte);
check(r"\u{ffffff}", EscapeError::UnicodeEscapeInByte);
check(r"\u{ffffff}", EscapeError::UnicodeEscapeInByte);
check(r"\u{DC00}", EscapeError::UnicodeEscapeInByte);
check(r"\u{DDDD}", EscapeError::UnicodeEscapeInByte);
check(r"\u{DFFF}", EscapeError::UnicodeEscapeInByte);
check(r"\u{D800}", EscapeError::UnicodeEscapeInByte);
check(r"\u{DAAA}", EscapeError::UnicodeEscapeInByte);
check(r"\u{DBFF}", EscapeError::UnicodeEscapeInByte);
}
#[test]
fn test_unescape_byte_good() {
fn check(literal_text: &str, expected_byte: u8) {
let actual_result = unescape_byte(literal_text);
assert_eq!(actual_result, Ok(expected_byte));
}
check("a", b'a');
check(r#"\""#, b'"');
check(r"\n", b'\n');
check(r"\r", b'\r');
check(r"\t", b'\t');
check(r"\\", b'\\');
check(r"\'", b'\'');
check(r"\0", b'\0');
check(r"\x00", b'\0');
check(r"\x5a", b'Z');
check(r"\x5A", b'Z');
check(r"\x7f", 127);
check(r"\x80", 128);
check(r"\xff", 255);
check(r"\xFF", 255);
}
#[test]
fn test_unescape_byte_str_good() {
fn check(literal_text: &str, expected: &[u8]) {
let mut buf = Ok(Vec::with_capacity(literal_text.len()));
unescape_byte_str(literal_text, &mut |range, c| {
if let Ok(b) = &mut buf {
match c {
Ok(c) => b.push(c),
Err(e) => buf = Err((range, e)),
}
}
});
let buf = buf.as_ref().map(|it| it.as_ref());
assert_eq!(buf, Ok(expected))
}
check("foo", b"foo");
check("", b"");
check(" \t\n\r\n", b" \t\n\n");
check("hello \\\n world", b"hello world");
check("hello \\\r\n world", b"hello world");
check("thread's", b"thread's")
}
}