Crate rustc_span

Expand description

Source positions and related helper functions.

Important concepts in this module include:

the span, represented by SpanData and related types;
source code as represented by a SourceMap; and
interned strings, represented by Symbols, with some common symbols available statically in the sym module.

Unlike most compilers, the span contains not only the position in the source code, but also various other metadata, such as the edition and macro hygiene. This metadata is stored in SyntaxContext and ExpnData.

Note

This API is completely unstable and subject to change.

Re-exports

pub use hygiene::DesugaringKind;

pub use hygiene::ExpnKind;

pub use hygiene::MacroKind;

pub use hygiene::ExpnData;

pub use hygiene::ExpnHash;

pub use hygiene::ExpnId;

pub use hygiene::LocalExpnId;

pub use hygiene::SyntaxContext;

pub use symbol::sym;

pub use symbol::Symbol;

Modules

analyze_source_file 🔒

caching_source_map_view 🔒

Machinery for hygienic macros.

lev_distance

Levenshtein distances.

profiling

source_map

Types for tracking pieces of source code within a crate.

span_encoding 🔒

symbol

An “interner” is a data structure that associates values with usize tags and allows bidirectional lookup; i.e., given a value, one can easily find the type, and vice versa.

Macros

impl_pos 🔒

Structs

BytePos

A byte offset.

CachingSourceMapView

CharPos

A character offset.

DebuggerVisualizerFile

A single debugger visualizer file.

Range inside of a Span used for diagnostics when we only have access to relative positions.

LineInfo

Loc

A source code location used for error reporting.

MalformedSourceMapPositions

MultiByteChar

Identifies an offset of a multi-byte character in a SourceFile.

NormalizedPos

Identifies an offset of a character that was normalized away from SourceFile.

OffsetOverflowError

SessionGlobals

Per-session global variables: this struct is stored in thread-local storage in such a way that it is accessible without any kind of handle to all threads within the compilation session, but is not accessible outside the session.

SourceFile

A single source in the SourceMap.

SourceFileAndBytePos

SourceFileAndLine

SourceFileDiffs

The source file lines in difference list form. This matches the form used within metadata, which saves space by exploiting the fact that the lines list is sorted and individual lines are usually not that long.

SourceFileHash

The hash of the on-disk source file used for debug info.

Span

A compressed span.

SpanData

Represents a span.