pub struct LexBuf<'a> {
buf: &'a str,
pos: usize,
}
Expand description
A cursor over a string with a variety of lexing convenience methods.
Fields§
§buf: &'a str
§pos: usize
Implementations§
Source§impl<'a> LexBuf<'a>
impl<'a> LexBuf<'a>
Sourcepub fn new(buf: &'a str) -> LexBuf<'a> ⓘ
pub fn new(buf: &'a str) -> LexBuf<'a> ⓘ
Creates a new lexical buffer.
The internal cursor is initialized to point at the start of buf
.
Sourcepub fn peek(&self) -> Option<char>
pub fn peek(&self) -> Option<char>
Returns the next character in the buffer, if any, without advancing the internal cursor.
Sourcepub fn next_n(&mut self, n: usize) -> Option<&'a str>
pub fn next_n(&mut self, n: usize) -> Option<&'a str>
Returns a slice containing the next n
characters in the buffer.
Returns None
if there are not at least n
characters remaining.
Advances the internal cursor n
characters, or to the end of the buffer
if there are less than n
characters remaining.
Sourcepub fn prev(&mut self) -> char
pub fn prev(&mut self) -> char
Returns the previous character in the buffer, positioning the internal cursor to before the character.
The next call to LexBuf::next
will return the same character.
§Panics
Panics if prev
is called when the internal cursor is positioned at
the beginning of the buffer.
Sourcepub fn consume(&mut self, ch: char) -> bool
pub fn consume(&mut self, ch: char) -> bool
Advances the internal cursor past the next character in the buffer if
the character is ch
.
Returns whether the cursor advanced.
Sourcepub fn consume_str(&mut self, s: &str) -> bool
pub fn consume_str(&mut self, s: &str) -> bool
Advances the internal cursor past s
if it exactly matches the next
characters in the buffer.
Returns whether the cursor advanced.
Sourcepub fn take_to_delimiter(&mut self, delim: &str) -> Option<&'a str>
pub fn take_to_delimiter(&mut self, delim: &str) -> Option<&'a str>
Searches the buffer for delim
, returning the string from the current
cursor position to the start of delim
.
Returns None
if delim
is not found in the buffer. The internal
cursor is advanced past the end of delim
, or to the end of the buffer
if delim
is not found.
Sourcepub fn take_while<P>(&mut self, predicate: P) -> &'a str
pub fn take_while<P>(&mut self, predicate: P) -> &'a str
Searches the remaining buffer for the first character to fail to satisfy
predicate
, returning the string from the current cursor position to
the failing character.
Advances the cursor to the character that failed the predicate, or to the end of the string if no character failed the predicate.
Trait Implementations§
Source§impl<'a> Iterator for LexBuf<'a>
impl<'a> Iterator for LexBuf<'a>
Source§fn next(&mut self) -> Option<char>
fn next(&mut self) -> Option<char>
Returns the next character in the buffer, if any, advancing the internal cursor past the character.
It is safe to call next
after it returns None
.
Source§fn next_chunk<const N: usize>(
&mut self,
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&mut self,
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Auto Trait Implementations§
impl<'a> Freeze for LexBuf<'a>
impl<'a> RefUnwindSafe for LexBuf<'a>
impl<'a> Send for LexBuf<'a>
impl<'a> Sync for LexBuf<'a>
impl<'a> Unpin for LexBuf<'a>
impl<'a> UnwindSafe for LexBuf<'a>
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