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  1. 05f2fc2 Update LICENSE (#75) by Franklin Yow · 10 days ago master
  2. aecb614 Fix header for multispan with null secondary urls (#72) by Nate Bosch · 9 weeks ago
  3. 7432611 Revert "Revert "Remove dependency on package:charcode (#66)" (#70)" (#73) by Nate Bosch · 9 weeks ago
  4. 1be3c44 Prepare to publish for stable null safety (#71) by Nate Bosch · 10 weeks ago 1.8.0
  5. 22df00f Revert "Remove dependency on package:charcode (#66)" (#70) by Nate Bosch · 10 weeks ago

source_span is a library for tracking locations in source code. It's designed to provide a standard representation for source code locations and spans so that disparate packages can easily pass them among one another, and to make it easy to generate human-friendly messages associated with a given piece of code.

The most commonly-used class is the package's namesake, SourceSpan. It represents a span of characters in some source file, and is often attached to an object that has been parsed to indicate where it was parsed from. It provides access to the text of the span via SourceSpan.text and can be used to produce human-friendly messages using SourceSpan.message().

When parsing code from a file, SourceFile is useful. Not only does it provide an efficient means of computing line and column numbers, SourceFile.span() returns special FileSpans that are able to provide more context for their error messages.