[][src]Struct syntax_ext::format::Context

struct Context<'a, 'b: 'a> {
    ecx: &'a mut ExtCtxt<'b>,
    macsp: Span,
    fmtsp: Span,
    args: Vec<P<Expr>>,
    arg_types: Vec<Vec<usize>>,
    arg_unique_types: Vec<Vec<ArgumentType>>,
    names: FxHashMap<String, usize>,
    literal: String,
    pieces: Vec<P<Expr>>,
    str_pieces: Vec<P<Expr>>,
    all_pieces_simple: bool,
    arg_index_map: Vec<Vec<usize>>,
    count_args_index_offset: usize,
    count_args: Vec<Position>,
    count_positions: FxHashMap<usize, usize>,
    count_positions_count: usize,
    curarg: usize,
    curpiece: usize,
    invalid_refs: Vec<(usize, usize)>,
    arg_spans: Vec<Span>,
    is_literal: bool,
}
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Fields

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The macro's call site. References to unstable formatting internals must use this span to pass the stability checker.

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The span of the format string literal.

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List of parsed argument expressions. Named expressions are resolved early, and are appended to the end of argument expressions.

Example showing the various data structures in motion:

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Placeholder slot numbers indexed by argument.

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Unique format specs seen for each argument.

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Map from named arguments to their resolved indices.

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The latest consecutive literal strings, or empty if there weren't any.

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Collection of the compiled rt::Argument structures

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Collection of string literals

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Stays true if all formatting parameters are default (as in "{}{}").

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Mapping between positional argument references and indices into the final generated static argument array. We record the starting indices corresponding to each positional argument, and number of references consumed so far for each argument, to facilitate correct Position mapping in build_piece. In effect this can be seen as a "flattened" version of arg_unique_types.

Again with the example described above in docstring for args:

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Starting offset of count argument slots.

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Count argument slots and tracking data structures. Count arguments are separately tracked for de-duplication in case multiple references are made to one argument. For example, in this format string:

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Relative slot numbers for count arguments.

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Number of count slots assigned.

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Current position of the implicit positional arg pointer, as if it still existed in this phase of processing. Used only for all_pieces_simple tracking in build_piece.

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Current piece being evaluated, used for error reporting.

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Keep track of invalid references to positional arguments.

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Spans of all the formatting arguments, in order.

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Whether this formatting string is a literal or it comes from a macro.

Methods

impl<'a, 'b> Context<'a, 'b>
[src]

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Verifies one piece of a parse string, and remembers it if valid. All errors are not emitted as fatal so we can continue giving errors about this and possibly other format strings.

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Handle invalid references to positional arguments. Output different errors for the case where all arguments are positional and for when there are named arguments or numbered positional arguments in the format string.

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Actually verifies and tracks a given format placeholder (a.k.a. argument).

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Builds the mapping between format placeholders and argument objects.

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Build a literal expression from the accumulated string literals

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Build a static rt::Argument from a parse::Piece or append to the literal string.

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Actually builds the expression which the format_args! block will be expanded to

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Auto Trait Implementations

impl<'a, 'b> !Send for Context<'a, 'b>

impl<'a, 'b> !Sync for Context<'a, 'b>

Blanket Implementations

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T