Struct rustc_parse_format::Parser
source · pub struct Parser<'a> {Show 13 fields
pub(crate) mode: ParseMode,
pub(crate) input: &'a str,
pub(crate) cur: Peekable<CharIndices<'a>>,
pub errors: Vec<ParseError>,
pub curarg: usize,
pub(crate) style: Option<usize>,
pub arg_places: Vec<InnerSpan>,
pub(crate) width_map: Vec<InnerWidthMapping>,
pub(crate) last_opening_brace: Option<InnerSpan>,
pub(crate) append_newline: bool,
pub is_source_literal: bool,
pub(crate) cur_line_start: usize,
pub line_spans: Vec<InnerSpan>,
}
Expand description
The parser structure for interpreting the input format string. This is
modeled as an iterator over Piece
structures to form a stream of tokens
being output.
This is a recursive-descent parser for the sake of simplicity, and if necessary there’s probably lots of room for improvement performance-wise.
Fields§
§mode: ParseMode
§input: &'a str
§cur: Peekable<CharIndices<'a>>
§errors: Vec<ParseError>
Error messages accumulated during parsing
curarg: usize
Current position of implicit positional argument pointer
style: Option<usize>
Some(raw count)
when the string is “raw”, used to position spans correctly
arg_places: Vec<InnerSpan>
Start and end byte offset of every successfully parsed argument
width_map: Vec<InnerWidthMapping>
Characters whose length has been changed from their in-code representation
last_opening_brace: Option<InnerSpan>
Span of the last opening brace seen, used for error reporting
append_newline: bool
Whether the source string is comes from println!
as opposed to format!
or print!
is_source_literal: bool
Whether this formatting string was written directly in the source. This controls whether we can use spans to refer into it and give better error messages. N.B: This does not control whether implicit argument captures can be used.
cur_line_start: usize
Start position of the current line.
line_spans: Vec<InnerSpan>
Start and end byte offset of every line of the format string. Excludes newline characters and leading whitespace.
Implementations§
source§impl<'a> Parser<'a>
impl<'a> Parser<'a>
sourcepub fn new(
s: &'a str,
style: Option<usize>,
snippet: Option<String>,
append_newline: bool,
mode: ParseMode
) -> Parser<'a> ⓘ
pub fn new( s: &'a str, style: Option<usize>, snippet: Option<String>, append_newline: bool, mode: ParseMode ) -> Parser<'a> ⓘ
Creates a new parser for the given format string
sourcepub(crate) fn err<S1: Into<String>, S2: Into<String>>(
&mut self,
description: S1,
label: S2,
span: InnerSpan
)
pub(crate) fn err<S1: Into<String>, S2: Into<String>>( &mut self, description: S1, label: S2, span: InnerSpan )
Notifies of an error. The message doesn’t actually need to be of type String, but I think it does when this eventually uses conditions so it might as well start using it now.
sourcepub(crate) fn err_with_note<S1: Into<String>, S2: Into<String>, S3: Into<String>>(
&mut self,
description: S1,
label: S2,
note: S3,
span: InnerSpan
)
pub(crate) fn err_with_note<S1: Into<String>, S2: Into<String>, S3: Into<String>>( &mut self, description: S1, label: S2, note: S3, span: InnerSpan )
Notifies of an error. The message doesn’t actually need to be of type String, but I think it does when this eventually uses conditions so it might as well start using it now.
sourcepub(crate) fn consume(&mut self, c: char) -> bool
pub(crate) fn consume(&mut self, c: char) -> bool
Optionally consumes the specified character. If the character is not at
the current position, then the current iterator isn’t moved and false
is
returned, otherwise the character is consumed and true
is returned.
sourcepub(crate) fn consume_pos(&mut self, c: char) -> Option<usize>
pub(crate) fn consume_pos(&mut self, c: char) -> Option<usize>
Optionally consumes the specified character. If the character is not at
the current position, then the current iterator isn’t moved and None
is
returned, otherwise the character is consumed and the current position is
returned.
pub(crate) fn remap_pos(&self, pos: usize) -> InnerOffset
pub(crate) fn to_span_index(&self, pos: usize) -> InnerOffset
pub(crate) fn to_span_width(&self, pos: usize) -> usize
pub(crate) fn span(&self, start_pos: usize, end_pos: usize) -> InnerSpan
sourcepub(crate) fn consume_closing_brace(
&mut self,
arg: &Argument<'_>
) -> Option<usize>
pub(crate) fn consume_closing_brace( &mut self, arg: &Argument<'_> ) -> Option<usize>
Forces consumption of the specified character. If the character is not found, an error is emitted.
sourcepub(crate) fn ws(&mut self)
pub(crate) fn ws(&mut self)
Consumes all whitespace characters until the first non-whitespace character
sourcepub(crate) fn string(&mut self, start: usize) -> &'a str
pub(crate) fn string(&mut self, start: usize) -> &'a str
Parses all of a string which is to be considered a “raw literal” in a format string. This is everything outside of the braces.
sourcepub(crate) fn argument(&mut self, start: InnerOffset) -> Argument<'a>
pub(crate) fn argument(&mut self, start: InnerOffset) -> Argument<'a>
Parses an Argument
structure, or what’s contained within braces inside the format string.
sourcepub(crate) fn position(&mut self) -> Option<Position<'a>>
pub(crate) fn position(&mut self) -> Option<Position<'a>>
Parses a positional argument for a format. This could either be an
integer index of an argument, a named argument, or a blank string.
Returns Some(parsed_position)
if the position is not implicitly
consuming a macro argument, None
if it’s the case.
pub(crate) fn current_pos(&mut self) -> usize
sourcepub(crate) fn format(&mut self) -> FormatSpec<'a>
pub(crate) fn format(&mut self) -> FormatSpec<'a>
Parses a format specifier at the current position, returning all of the
relevant information in the FormatSpec
struct.
sourcepub(crate) fn inline_asm(&mut self) -> FormatSpec<'a>
pub(crate) fn inline_asm(&mut self) -> FormatSpec<'a>
Parses an inline assembly template modifier at the current position, returning the modifier
in the ty
field of the FormatSpec
struct.
sourcepub(crate) fn count(&mut self, start: usize) -> Count<'a>
pub(crate) fn count(&mut self, start: usize) -> Count<'a>
Parses a Count
parameter at the current position. This does not check
for ‘CountIsNextParam’ because that is only used in precision, not
width.
sourcepub(crate) fn word(&mut self) -> &'a str
pub(crate) fn word(&mut self) -> &'a str
Parses a word starting at the current position. A word is the same as
Rust identifier, except that it can’t start with _
character.
pub(crate) fn integer(&mut self) -> Option<usize>
pub(crate) fn suggest_format(&mut self)
pub(crate) fn suggest_positional_arg_instead_of_captured_arg( &mut self, arg: Argument<'a> )
Trait Implementations§
source§impl<'a> Iterator for Parser<'a>
impl<'a> Iterator for Parser<'a>
source§fn next(&mut self) -> Option<Piece<'a>>
fn next(&mut self) -> Option<Piece<'a>>
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Iterator
are lexicographically
greater than those of another. Read more1.5.0 · source§fn ge<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,
Self: Sized,
fn ge<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,
Iterator
are lexicographically
greater than or equal to those of another. Read moresource§fn is_sorted_by<F>(self, compare: F) -> boolwhere
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
fn is_sorted_by<F>(self, compare: F) -> boolwhere Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
is_sorted
)source§fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> K,
K: PartialOrd<K>,
fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> K, K: PartialOrd<K>,
is_sorted
)Auto Trait Implementations§
impl<'a> RefUnwindSafe for Parser<'a>
impl<'a> Send for Parser<'a>
impl<'a> Sync for Parser<'a>
impl<'a> Unpin for Parser<'a>
impl<'a> UnwindSafe for Parser<'a>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<I> IntoIterator for Iwhere
I: Iterator,
impl<I> IntoIterator for Iwhere I: Iterator,
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 216 bytes