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| 1 `source_span` is a library for tracking locations in source code. It's designed |
| 2 to provide a standard representation for source code locations and spans so that |
| 3 disparate packages can easily pass them among one another, and to make it easy |
| 4 to generate human-friendly messages associated with a given piece of code. |
| 5 |
| 6 The most commonly-used class is the package's namesake, `SourceSpan`. It |
| 7 represents a span of characters in some source file, and is often attached to an |
| 8 object that has been parsed to indicate where it was parsed from. It provides |
| 9 access to the text of the span via `SourceSpan.text` and can be used to produce |
| 10 human-friendly messages using `SourceSpan.message()`. |
| 11 |
| 12 When parsing code from a file, `SourceFile` is useful. Not only does it provide |
| 13 an efficient means of computing line and column numbers, `SourceFile.span()` |
| 14 returns special `FileSpan`s that are able to provide more context for their |
| 15 error messages. |
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