Struct yaml_rust2::scanner::Scanner
source · pub struct Scanner<T> { /* private fields */ }
Expand description
The YAML scanner.
This corresponds to the low-level interface when reading YAML. The scanner emits token as they are read (akin to a lexer), but it also holds sufficient context to be able to disambiguate some of the constructs. It has understanding of indentation and whitespace and is able to generate error messages for some invalid YAML constructs.
It is however not a full parser and needs crate::parser::Parser
to fully detect invalid
YAML documents.
Implementations§
source§impl<T: Iterator<Item = char>> Scanner<T>
impl<T: Iterator<Item = char>> Scanner<T>
sourcepub fn get_error(&self) -> Option<ScanError>
pub fn get_error(&self) -> Option<ScanError>
Get a copy of the last error that was encountered, if any.
This does not clear the error state and further calls to Self::get_error
will return (a
clone of) the same error.
sourcepub fn stream_started(&self) -> bool
pub fn stream_started(&self) -> bool
Return whether the TokenType::StreamStart
event has been emitted.
sourcepub fn stream_ended(&self) -> bool
pub fn stream_ended(&self) -> bool
Return whether the TokenType::StreamEnd
event has been emitted.
sourcepub fn fetch_next_token(&mut self) -> ScanResult
pub fn fetch_next_token(&mut self) -> ScanResult
Fetch the next token in the stream.
§Errors
Returns ScanError
when the scanner does not find the next expected token.
sourcepub fn next_token(&mut self) -> Result<Option<Token>, ScanError>
pub fn next_token(&mut self) -> Result<Option<Token>, ScanError>
Return the next token in the stream.
§Errors
Returns ScanError
when scanning fails to find an expected next token.
sourcepub fn fetch_more_tokens(&mut self) -> ScanResult
pub fn fetch_more_tokens(&mut self) -> ScanResult
Trait Implementations§
source§impl<T: Iterator<Item = char>> Iterator for Scanner<T>
impl<T: Iterator<Item = char>> Iterator for Scanner<T>
source§fn next(&mut self) -> Option<Token>
fn next(&mut self) -> Option<Token>
source§fn next_chunk<const N: usize>(
&mut self
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