Concrete implementation for leaf nodes.

Make sure STDOUT and STDERR are kept separate when testing Black via its CLI.

Holds leaves and comments. Can be printed with `str(line)`.

Concrete implementation for interior nodes.

A readable split that fits the allotted line length is impossible.

Base class for errors raised by Transformers.

A fake click Context for when calling functions that need it.

A state machine that aids in parsing a string's "trailer", which can be either non-existent, an old-style formatting sequence (e.g. `% varX`

Exception to signal the parser is stuck.

Provides a reformatting counter. Can be rendered with `str(report)`.

Raised when an opening bracket is unable to be matched to a closing bracket.

Keeps track of brackets on a line.

Find cell magics. Note that the source of the abstract syntax tree will already have been processed by IPython's TransformerManager().tra

A custom (i.e. manual) string split. A single CustomSplit instance represents a single substring. Examples: Consider the following s

Provides a stateful method that returns the number of potential extra empty lines needed before and after the currently processed line. Note:

A fake click Parameter for when calling functions that need it.

Used to wrap failures when assert_format() runs in an extra mode.

Raised when input source code fails all parse attempts.

Generates reformatted Line objects. Empty lines are not emitted. Note: destroys the tree it's visiting by mutating prefixes of its leaves in

Class that holds information about a block of formatted lines. This is introduced so that the EmptyLineTracker can look behind the standalone

Visit cell to look for get_ipython calls. Note that the source of the abstract syntax tree will already have been processed by IPython's

Describes a piece of syntax that is a comment. It's not a :class:`blib2to3.pytree.Leaf` so that: * it can be cached (`Leaf` objects should n

Intermediate split result from a right hand split.

StringTransformer that merges strings together. Requirements: (A) The line contains adjacent strings such that ALL of the validation chec

StringTransformer that strips surrounding parentheses from strings. Requirements: The line contains a string which is surrounded by paren

StringTransformer that wraps strings in parens and then splits at the LPAR. Requirements: All of the requirements listed in BaseStri

StringTransformer that splits "atom" strings (i.e. strings which exist on lines by themselves). Requirements: * The line consist

A wildcard pattern can match zero or more nodes. This has all the flexibility needed to implement patterns like: .* .+ .?

A multiline class docstring.

Abstract base class for Node and Leaf. This provides some default functionality and boilerplate using the template pattern. A node

A pattern is a tree matching pattern. It looks for a specific node type (token or symbol), and optionally for a specific content. T

Abstract class for StringTransformers which transform a Line's strings by splitting them or placing them on their own lines where necessary t

Test class

Test class

Test class

A docstring.

A docstring.

Test class

Test class

Just a docstring.

Just a docstring.

Just a docstring.

Grammar subclass that reads classic pgen output files. The run() method reads the tables as produced by the pgen parser generator, typically

This mixin class is used to map merged strings to a sequence of CustomSplits, which will then be used to re-split the strings iff none of