Struct syntax::parse::parser::Parser [] [src]

pub struct Parser<'a> {
    pub sess: &'a ParseSess,
    pub token: Token,
    pub span: Span,
    pub meta_var_span: Option<Span>,
    pub prev_span: Span,
    pub restrictions: Restrictions,
    pub obsolete_set: HashSet<ObsoleteSyntax>,
    pub directory: Directory,
    pub recurse_into_file_modules: bool,
    pub root_module_name: Option<String>,
    pub expected_tokens: Vec<TokenType>,
    pub desugar_doc_comments: bool,
    pub cfg_mods: bool,
    // some fields omitted
}
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Fields

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the current token:

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the span of the current token:

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the span of the previous token:

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The set of seen errors about obsolete syntax. Used to suppress extra detail when the same error is seen twice

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Used to determine the path to externally loaded source files

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Whether to parse sub-modules in other files.

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Name of the root module this parser originated from. If None, then the name is not known. This does not change while the parser is descending into modules, and sub-parsers have new values for this name.

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Whether we should configure out of line modules as we parse.

Methods

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

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Convert a token to a string using self's reader

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Convert the current token to a string using self's reader

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Expect and consume the token t. Signal an error if the next token is not t.

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Expect next token to be edible or inedible token. If edible, then consume it; if inedible, then return without consuming anything. Signal a fatal error if next token is unexpected.

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Check if the next token is tok, and return true if so.

This method will automatically add tok to expected_tokens if tok is not encountered.

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Consume token 'tok' if it exists. Returns true if the given token was present, false otherwise.

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If the next token is the given keyword, eat it and return true. Otherwise, return false.

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If the given word is not a keyword, signal an error. If the next token is not the given word, signal an error. Otherwise, eat it.

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Expect and consume a GT. if a >> is seen, replace it with a single > and continue. If a GT is not seen, signal an error.

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Parse a sequence bracketed by '<' and '>', stopping before the '>'.

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Eat and discard tokens until one of kets is encountered. Respects token trees, passes through any errors encountered. Used for error recovery.

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Parse a sequence, including the closing delimiter. The function f must consume tokens until reaching the next separator or closing bracket.

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Parse a sequence, not including the closing delimiter. The function f must consume tokens until reaching the next separator or closing bracket.

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Parse a sequence, including the closing delimiter. The function f must consume tokens until reaching the next separator or closing bracket.

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Advance the parser by one token

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Advance the parser using provided token as a next one. Use this when consuming a part of a token. For example a single < from <<.

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Is the current token one of the keywords that signals a bare function type?

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parse a TyKind::BareFn type:

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Parse the items in a trait declaration

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Parse optional return type [ -> TY ] in function decl

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This version of parse arg doesn't necessarily require identifier names.

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Parse a single function argument

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Parse an argument in a lambda header e.g. |arg, arg|

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Matches token_lit = LIT_INTEGER | ...

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Matches lit = true | false | token_lit

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matches '-' lit | lit (cf. ast_validation::AstValidator::check_expr_within_pat)

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Parses simple paths.

path = [::] segment+ segment = ident | ident[::]<args> | ident[::](args) [-> type]

Examples

a::b::C<D> (without disambiguator) a::b::C::<D> (with disambiguator) Fn(Args) (without disambiguator) Fn::(Args) (with disambiguator)

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Like parse_path, but also supports parsing Word meta items into paths for back-compat. This is used when parsing derive macro paths in #[derive] attributes.

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Parse ident (COLON expr)?

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Parse a block or unsafe block

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parse a.b or a(13) or a[4] or just a

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parse a single token tree from the input.

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Parse a prefix-unary-operator expr

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Parse an associative expression

This parses an expression accounting for associativity and precedence of the operators in the expression.

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Parse an associative expression with operators of at least min_prec precedence

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Parse an 'if' or 'if let' expression ('if' token already eaten)

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Parse an 'if let' expression ('if' token already eaten)

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Parse a 'for' .. 'in' expression ('for' token already eaten)

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Parse a 'while' or 'while let' expression ('while' token already eaten)

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Parse a 'while let' expression ('while' token already eaten)

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Parse a do catch {...} expression (do catch token already eaten)

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Parse an expression

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Evaluate the closure with restrictions in place.

After the closure is evaluated, restrictions are reset.

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Parse an expression, subject to the given restrictions

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Parse a pattern.

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Parse a statement. This stops just before trailing semicolons on everything but items. e.g. a StmtKind::Semi parses to a StmtKind::Expr, leaving the trailing ; unconsumed.

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🔬 This is a nightly-only experimental API. (rustc_private)

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Parse a block. No inner attrs are allowed.

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parse a statement, including the trailing semicolon.

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parses (possibly empty) list of lifetime and type parameters, possibly including trailing comma and erroneous trailing attributes.

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parse a set of optional generic type parameter declarations. Where clauses are not parsed here, and must be added later via parse_where_clause().

matches generics = ( ) | ( < > ) | ( < typaramseq ( , )? > ) | ( < lifetimes ( , )? > ) | ( < lifetimes , typaramseq ( , )? > ) where typaramseq = ( typaram ) | ( typaram , typaramseq )

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parses an optional where clause and places it in generics.

Be careful when using this code, it's not being tested!
where T : Trait<U, V> + 'b, 'a : 'b

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parse the argument list and result type of a function declaration

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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true if we are looking at const ID, false for things like const fn etc

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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parses all the "front matter" for a fn declaration, up to and including the fn keyword:

  • const fn
  • unsafe fn
  • const unsafe fn
  • extern fn
  • etc

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parse an impl item.

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Parse a structure field declaration

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parse pub, pub(crate) and pub(in path) plus shortcuts pub(self) for pub(in self) and pub(super) for pub(in super). If the following element can't be a tuple (i.e. it's a function definition, it's not a tuple struct field) and the contents within the parens isn't valid, emit a proper diagnostic.

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Returns either a path to a module, or .

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🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parses a source module as a crate. This is the main entry point for the parser.

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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Parse attributes that appear before an item

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🔬 This is a nightly-only experimental API. (rustc_private)

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Matches attribute = # ! [ meta_item ]

If permit_inner is true, then a leading ! indicates an inner attribute

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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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Parse attributes that appear after the opening of an item. These should be preceded by an exclamation mark, but we accept and warn about one terminated by a semicolon. matches inner_attrs*

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🔬 This is a nightly-only experimental API. (rustc_private)

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Per RFC#1559, matches the following grammar:

meta_item : IDENT ( '=' UNSUFFIXED_LIT | '(' meta_item_inner? ')' )? ; meta_item_inner : (meta_item | UNSUFFIXED_LIT) (',' meta_item_inner)? ;

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Trait Implementations

impl<'a> Clone for Parser<'a>
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[src]

Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl<'a> ParserObsoleteMethods for Parser<'a>
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[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Reports an obsolete syntax non-fatal error.

[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?