packages/source_span/README.md - Issue 1400473008: Roll Observatory packages and add a roll script

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Issue 1400473008: Roll Observatory packages and add a roll script (Closed) Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master

Patch Set: Created 5 years, 2 months ago

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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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