Struct syntax::parse::lexer::StringReader[][src]

pub struct StringReader<'a> {
    pub sess: &'a ParseSess,
    pub next_pos: BytePos,
    pub pos: BytePos,
    pub ch: Option<char>,
    pub filemap: Lrc<FileMap>,
    pub end_src_index: usize,
    peek_tok: Token,
    peek_span: Span,
    peek_span_src_raw: Span,
    fatal_errs: Vec<DiagnosticBuilder<'a>>,
    src: Lrc<String>,
    token: Token,
    span: Span,
    span_src_raw: Span,
    open_braces: Vec<(DelimToken, Span)>,
    pub(crate) override_span: Option<Span>,
}
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Fields

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The absolute offset within the codemap of the next character to read

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The absolute offset within the codemap of the current character

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The current character (which has been read from self.pos)

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Stop reading src at this index.

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Stack of open delimiters and their spans. Used for error message.

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The raw source span which does not take override_span into account

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Methods

impl<'a> StringReader<'a>
[src]

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impl<'a> StringReader<'a>
[src]

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Return the next token. EFFECT: advances the string_reader.

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For comments.rs, which hackily pokes into next_pos and ch

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Report a fatal lexical error with a given span.

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Report a lexical error with a given span.

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Report a fatal error spanning [from_pos, to_pos).

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Report a lexical error spanning [from_pos, to_pos).

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Pushes a character to a message string for error reporting

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Report a lexical error spanning [from_pos, to_pos), appending an escaped character to the error message

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Report a lexical error spanning [from_pos, to_pos), appending an escaped character to the error message

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Report a lexical error spanning [from_pos, to_pos), appending the offending string to the error message

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Advance peek_tok and peek_span to refer to the next token, and possibly update the interner.

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Calls f with a string slice of the source text spanning from start up to but excluding self.pos, meaning the slice does not include the character self.ch.

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Create a Name from a given offset to the current offset, each adjusted 1 towards each other (assumes that on either side there is a single-byte delimiter).

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As name_from, with an explicit endpoint.

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Calls f with a string slice of the source text spanning from start up to but excluding end.

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Converts CRLF to LF in the given string, raising an error on bare CR.

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Advance the StringReader by one character. If a newline is discovered, add it to the FileMap's list of line start offsets.

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Eats <XID_start><XID_continue>*, if possible.

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PRECONDITION: self.ch is not whitespace Eats any kind of comment.

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If there is whitespace, shebang, or a comment, scan it. Otherwise, return None.

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Might return a sugared-doc-attr

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Scan through any digits (base scan_radix) or underscores, and return how many digits there were.

real_radix represents the true radix of the number we're interested in, and errors will be emitted for any digits between real_radix and scan_radix.

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Lex a LIT_INTEGER or a LIT_FLOAT

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Scan over n_digits hex digits, stopping at delim, reporting an error if too many or too few digits are encountered.

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Scan for a single (possibly escaped) byte or char in a byte, (non-raw) byte string, char, or (non-raw) string literal. start is the position of first_source_char, which is already consumed.

Returns true if there was a valid char/byte, false otherwise.

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Scan over a \u{...} escape

At this point, we have already seen the \ and the u, the { is the current character. We will read a hex number (with _ separators), with 1 to 6 actual digits, and pass over the }.

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Scan over a float exponent.

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Check that a base is valid for a floating literal, emitting a nice error if it isn't.

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Return the next token from the string, advances the input past that token, and updates the interner

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Auto Trait Implementations

impl<'a> !Send for StringReader<'a>

impl<'a> !Sync for StringReader<'a>