View Source Styler.Style behaviour (Styler v0.3.0)

A Style takes AST and returns a transformed version of that AST.

Because these transformations involve traversing trees (the "T" in "AST"), we wrap the AST in a structure called a Zipper to facilitate walking the trees.

Link to this section Summary

Callbacks

run will be used with Zipper.traverse_while/3, meaning it will be executed on every node of the AST.

Functions

Set the line of all comments with line in range_start..range_end to instead have line range_start

Change the line of all comments with line in range by adding delta to it. A positive delta will move the lines further down a file, while a negative delta will move them up.

Link to this section Types

@type context() :: %{comment: [map()], file: :stdin | String.t()}

Link to this section Callbacks

run will be used with Zipper.traverse_while/3, meaning it will be executed on every node of the AST.

You can skip traversing parts of the tree by returning a Zipper that's further along in the traversal, for example by calling Zipper.skip(zipper) to skip an entire subtree you know is of no interest to your Style.

Link to this section Functions

Link to this function

displace_comments(comments, range)

View Source

Set the line of all comments with line in range_start..range_end to instead have line range_start

Link to this function

shift_comments(comments, range, delta)

View Source

Change the line of all comments with line in range by adding delta to it. A positive delta will move the lines further down a file, while a negative delta will move them up.