Struct CharacterReader 

pub struct CharacterReader<'a> { /* private fields */ }

A forward-only reader over a string.

Implementations

impl CharacterReader<'_>

pub fn parse_arguments( &mut self, open: char, close: char, ) -> Result<Vec<String>, ExpressionParseException>

Parses a list of arguments enclosed in open/close and separated by ,. The reader must be positioned on open.

pub fn parse_arguments_with_delimiter( &mut self, open: char, close: char, delimiter: char, ) -> Result<Vec<String>, ExpressionParseException>

Parses a list of arguments enclosed in open/close and separated by delimiter. The reader must be positioned on open.

impl<'a> CharacterReader<'a>

pub fn new(s: &'a str) -> Self

Creates a reader positioned at the start of s.

pub fn end(&self) -> bool

Gets a value indicating whether the whole input has been consumed.

pub fn peek(&self) -> Option<char>

Gets the next character without consuming it, or None at the end.

pub fn position(&self) -> i32

Gets the number of characters consumed so far.

As upstream, Self::skip does not advance the position.

pub fn take(&mut self) -> Option<char>

Consumes and returns the next character, or returns None at the end.

pub fn skip_whitespace(&mut self)

Consumes leading white space.

pub fn take_if(&mut self, c: char) -> bool

Consumes the next character if it equals c.

pub fn take_if_str(&mut self, s: &str) -> bool

Consumes s if the remaining input starts with it.

pub fn take_if_fn(&mut self, condition: impl Fn(char) -> bool) -> bool

Consumes the next character if it satisfies condition.

pub fn take_until(&mut self, c: char) -> &'a str

Consumes and returns everything up to (not including) the first c, or the rest of the input when c does not occur.

pub fn take_while(&mut self, condition: impl Fn(char) -> bool) -> &'a str

Consumes and returns the longest prefix whose characters all satisfy condition.

pub fn try_peek(&self, count: usize) -> &'a str

Returns the next count characters without consuming them, or an empty string when fewer than count characters remain.

pub fn peek_whitespace(&self) -> &'a str

Returns the leading white space without consuming it.

pub fn skip(&mut self, count: usize)

Consumes count characters without advancing Self::position (as upstream).

Panics

Panics when fewer than count characters remain; callers skip only what they have peeked.

impl<'a> CharacterReader<'a>

pub fn parse_identifier(&mut self) -> &'a str

Parses an identifier: a letter or _ followed by letters, _, marks, connector punctuation, format characters and decimal digits. Returns an empty string (consuming nothing) when the input does not start with an identifier.

pub fn parse_type_identifier(&mut self) -> &'a str

Parses an identifier that may name a nested type, e.g. “Outer+Inner”.

pub fn parse_number(&mut self) -> &'a str

Parses a run of decimal digits (possibly empty).

impl CharacterReader<'_>

pub fn check_keyword(&self, keyword: &str) -> bool

Checks whether the input continues with optional white space followed by keyword, without consuming anything.

pub fn take_if_keyword(&mut self, keyword: &str) -> bool

Consumes optional white space followed by keyword if the input continues with it.

As upstream, the consumed characters are skipped without advancing CharacterReader::position.

impl<'a> CharacterReader<'a>

pub fn parse_style_class(&mut self) -> &'a str

Parses a style class name: an identifier that may also contain -. Returns an empty string (consuming nothing) when the input does not start with a class name.

Trait Implementations

impl<'a> Clone for CharacterReader<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for CharacterReader<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.