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  1. b2673d3 Merge pull request #29 from dart-lang/fixes by Natalie Weizenbaum · 4 days ago master 1.5.2
  2. fc5ad30 Don't crash on spans that end on empty lines by Natalie Weizenbaum · 4 days ago
  3. cb457d5 Make FileSpan.context include the full line for all point spans by Natalie Weizenbaum · 4 days ago
  4. 47214cd SourceFile.span() should include last char when end offset omitted (#28) by Evan Weible · 4 days ago
  5. 4fc24bc Merge pull request #27 from dart-lang/highlight-crlf by Natalie Weizenbaum · 7 days ago 1.5.1

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.