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librustc_lexer: Simplify "raw_double_quoted_string" method

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This commit is contained in:
Igor Aleksanov 2019-11-03 12:55:50 +03:00
parent d6f722d79c
commit 6e350bd999
1 changed files with 37 additions and 28 deletions
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65
src/librustc_lexer/src/lib.rs
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@ -600,36 +600,45 @@ impl Cursor<'_> {
/// (amount of the '#' symbols, raw string started, raw string terminated)
fn raw_double_quoted_string(&mut self) -> (usize, bool, bool) {
debug_assert!(self.prev() == 'r');
// Count opening '#' symbols.
let n_hashes = {
let mut acc: usize = 0;
loop {
match self.bump() {
Some('#') => acc += 1,
Some('"') => break acc,
None | Some(_) => return (acc, false, false),
}
}
};
let mut started: bool = false;
let mut finished: bool = false;
// Skip the string itself and check that amount of closing '#'
// symbols is equal to the amount of opening ones.
loop {
match self.bump() {
Some('"') => {
let mut acc = n_hashes;
while self.nth_char(0) == '#' && acc > 0 {
self.bump();
acc -= 1;
}
if acc == 0 {
return (n_hashes, true, true);
}
}
Some(_) => (),
None => return (n_hashes, true, false),
}
// Count opening '#' symbols.
let n_hashes = self.eat_while(|c| c == '#');
// Check that string is started.
match self.bump() {
Some('"') => started = true,
_ => return (n_hashes, started, finished),
}
// Skip the string contents and on each '#' character met, check if this is
// a raw string termination.
while !finished {
self.eat_while(|c| c != '"');
if self.is_eof() {
return (n_hashes, started, finished);
}
// Eat closing double quote.
self.bump();
// Check that amount of closing '#' symbols
// is equal to the amount of opening ones.
let mut hashes_left = n_hashes;
let is_closing_hash = |c| {
if c == '#' && hashes_left != 0 {
hashes_left -= 1;
true
} else {
false
}
};
finished = self.eat_while(is_closing_hash) == n_hashes;
}
(n_hashes, started, finished)
}
fn eat_decimal_digits(&mut self) -> bool {