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,
    prev_token_kind: PrevTokenKind,
    pub restrictions: Restrictions,
    pub directory: Directory,
    pub recurse_into_file_modules: bool,
    pub root_module_name: Option<String>,
    pub expected_tokens: Vec<TokenType>,
    token_cursor: TokenCursor,
    pub desugar_doc_comments: bool,
    pub cfg_mods: bool,
}
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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 previous token kind

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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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returns the span of expr, if it was not interpolated or the span of the interpolated token

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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 an &. If && is seen, replace it with a single & and continue. If an & is not seen, signal an error.

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

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Attempt to consume a <. If << is seen, replace it with a single < and continue. If a < is not seen, return false.

This is meant to be used when parsing generics on a path to get the starting token.

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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 unsafety: unsafe or nothing.

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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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Parse a type in restricted contexts where + is not permitted. Example 1: &'a TYPE + is prohibited to maintain operator priority (P(+) < P(&)). Example 2: value1 as TYPE + value2 + is prohibited to avoid interactions with expression grammar.

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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 qualified path. Assumes that the leading < has been parsed already.

qualified_path = <type [as trait_ref]>::path

Examples

<T as U>::a <T as U>::F::a<S> (without disambiguator) <T as U>::F::a::<S> (with disambiguator)

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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 single lifetime 'a or panic.

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Parse mutability (mut or nothing).

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Parse ident (COLON expr)?

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At the bottom (top?) of the precedence hierarchy, parse things like parenthesized exprs, macros, return, etc.

NB: This does not parse outer attributes, and is private because it only works correctly if called from parse_dot_or_call_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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🔬 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 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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Produce an error if comparison operators are chained (RFC #558). We only need to check lhs, not rhs, because all comparison ops have same precedence and are left-associative

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Parse prefix-forms of range notation: ..expr, .., ..=expr

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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 the RHS of a local variable declaration (e.g. '= 14;')

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Parse patterns, separated by '|' s

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Parse the fields of a struct-like pattern

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A wrapper around parse_pat with some special error handling for the "top-level" patterns in a match arm, for loop, let, &c. (in contast to subpatterns within such).

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Parse a pattern.

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Parse a pattern, with a setting whether modern range patterns e.g. a..=b, a..b are allowed.

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Parse ident or ident @ pat used by the copy foo and ref foo patterns to give a good error message when parsing mistakes like ref foo(a,b)

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Parse a local variable declaration

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Parse a structure field

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Emit an expected item after attributes error.

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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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🔬 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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🔬 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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🔬 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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🔬 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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Is this expression a successfully-parsed statement?

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Parse a block. No inner attrs are allowed.

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Parse a block. Inner attrs are allowed.

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Parse the rest of a block expression or function body Precondition: already parsed the '{'.

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Parse a statement, including the trailing semicolon.

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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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Important traits for Vec<u8>

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Matches typaram = IDENT (? unbound)? optbounds ( EQ ty )?

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Parses the following grammar: TraitItemAssocTy = Ident ["<"...">"] [":" TyParamBounds] ["where" ...] ["=" Ty]

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

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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 )

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Parses (possibly empty) list of lifetime and type arguments and associated type bindings, possibly including trailing comma.

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Parses an optional where clause and places it in generics.

This example is not tested
where T : Trait<U, V> + 'b, 'a : 'b

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

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Parse the argument list and result type of a function declaration

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Returns the parsed optional self argument and whether a self shortcut was used.

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Parse the parameter list and result type of a function that may have a self parameter.

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Parse the name and optional generic types of a function header.

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Parse an item-position function declaration.

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

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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

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Parse an impl item.

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

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Parse a method or a macro invocation in a trait impl.

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Parse trait Foo { ... } or trait Foo = Bar;

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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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Parses an implementation item, impl keyword is already parsed. impl<'a, T> TYPE { /* impl items / } impl<'a, T> TRAIT for TYPE { / impl items / } impl<'a, T> !TRAIT for TYPE { / impl items */ } We actually parse slightly more relaxed grammar for better error reporting and recovery. impl GENERICS !? TYPE for? (TYPE | ..) (where PREDICATES)? { BODY } impl GENERICS !? TYPE (where PREDICATES)? { BODY }

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Parse struct Foo { ... }

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Parse union Foo { ... }

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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 a structure field declaration

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Parse an element of a struct definition

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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.

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Parse defaultness: default or nothing.

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Given a termination token, parse all of the items in a module

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Parse a mod <foo> { ... } or mod <foo>; item

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🔬 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)

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Read a module from a source file.

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Parse a function declaration from a foreign module

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Parse a static item from a foreign module. Assumes that the static keyword is already parsed.

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Parse a type from a foreign module

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Parse extern crate links

Examples

extern crate foo; extern crate bar as foo;

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Parse extern for foreign ABIs modules.

extern is expected to have been consumed before calling this method

Examples:

extern "C" {} extern {}

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Parse type Foo = Bar;

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Parse the part of an "enum" decl following the '{'

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Parse an "enum" declaration

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Parses a string as an ABI spec on an extern type or module. Consumes the extern keyword, if one is found.

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Parse one of the items allowed by the flags. NB: this function no longer parses the items inside an extern crate.

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Parse a foreign item.

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This is the fall-through for parsing items.

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Parse a macro invocation inside a trait, impl or extern block

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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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::{ or ::*

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Parse UseTree

USE_TREE = [::] * | [::] { USE_TREE_LIST } | PATH :: * | PATH :: { USE_TREE_LIST } | PATH [as IDENT]

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Parse UseTreeKind::Nested(list)

USE_TREE_LIST = Ø | (USE_TREE ,)* USE_TREE [,]

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🔬 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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impl<'a> Parser<'a>
[src]

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Parse attributes that appear before an item

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Matches attribute = # ! [ meta_item ]

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

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The same as parse_attribute, except it takes in an InnerAttributeParsePolicy that prescribes how to handle inner attributes.

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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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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)? ;

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matches meta_item_inner : (meta_item | UNSUFFIXED_LIT) ;

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matches meta_seq = ( COMMASEP(meta_item_inner) )

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

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Trait Implementations

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

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Auto Trait Implementations

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

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