The SourceMap tracks all the source code used within a single crate, mapping
from integer byte positions to the original source code location. Each bit
of source parsed during crate parsing (typically files, in-memory strings,
or various bits of macro expansion) cover a continuous range of bytes in the
SourceMap and are represented by SourceFiles. Byte positions are stored in
spans and used pervasively in the compiler. They are absolute positions
within the SourceMap, which upon request can be converted to line and column
information, source code snippets, etc.
Machinery for hygienic macros, inspired by the
A byte offset. Keep this small (currently 32-bits), as AST contains a lot of them.
A character offset. Because of multibyte utf8 characters, a byte offset is not equivalent to a character offset. The SourceMap will convert BytePos values to CharPos values as necessary.
Used to create a
A source code location used for error reporting
A source code location used as the result of
A mark is a unique id associated with a macro expansion.
Identifies an offset of a multi-byte character in a SourceFile
A collection of spans. Spans have two orthogonal attributes:
A FileLoader that uses std::fs to load real files.
A single source in the SourceMap.
The interner for spans.
Spans represent a region of code, used for error reporting. Positions in
spans are absolute positions from the beginning of the
positions relative to
SourceFiles. Methods on the
SourceMap can be used
to relate spans back to the original source.
You must be careful if the span crosses more than one file - you will not be
able to use many of the functions on spans in
source_map and you cannot
assume that the length of the
span = hi - lo; there may be space in the
BytePos range between files.
A SyntaxContext represents a chain of macro expansions (represented by marks).
Differentiates between real files and common virtual files.
Identifies an offset of a non-narrow character in a SourceFile
Storage for span hygiene data.