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Consume the escaped Windows newline (\r\n) for FStringMiddle (#7722)

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## Summary

This PR fixes a bug where if a Windows newline (`\r\n`) character was
escaped, then only the `\r` was consumed and not `\n` leading to an
unterminated string error.

## Test Plan

Add new test cases to check the newline escapes.

fixes: #7632
This commit is contained in:
Dhruv Manilawala 2023-10-01 07:58:20 +05:30 • committed by GitHub
parent e72d617f4b
commit e91ffe3e93
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 101 additions and 2 deletions
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28
crates/ruff_python_parser/src/lexer.rs
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@ -584,7 +584,7 @@ impl<'source> Lexer<'source> {
location: self.offset(),
});
}
'\n' if !fstring.is_triple_quoted() => {
'\n' | '\r' if !fstring.is_triple_quoted() => {
return Err(LexicalError {
error: LexicalErrorType::FStringError(FStringErrorType::UnterminatedString),
location: self.offset(),
@ -603,7 +603,11 @@ impl<'source> Lexer<'source> {
}
}
// Consume the escaped character.
self.cursor.bump();
if self.cursor.eat_char('\r') {
self.cursor.eat_char('\n');
} else {
self.cursor.bump();
}
}
quote @ ('\'' | '"') if quote == fstring.quote_char() => {
if let Some(triple_quotes) = fstring.triple_quotes() {
@ -1983,6 +1987,26 @@ def f(arg=%timeit a = b):
assert_debug_snapshot!(lex_source(source));
}
fn fstring_single_quote_escape_eol(eol: &str) -> Vec<Spanned> {
let source = format!(r"f'text \{eol} more text'");
lex_source(&source)
}
#[test]
fn test_fstring_single_quote_escape_unix_eol() {
assert_debug_snapshot!(fstring_single_quote_escape_eol(UNIX_EOL));
}
#[test]
fn test_fstring_single_quote_escape_mac_eol() {
assert_debug_snapshot!(fstring_single_quote_escape_eol(MAC_EOL));
}
#[test]
fn test_fstring_single_quote_escape_windows_eol() {
assert_debug_snapshot!(fstring_single_quote_escape_eol(WINDOWS_EOL));
}
#[test]
fn test_fstring_escape() {
let source = r#"f"\{x:\"\{x}} \"\"\