meta commit contracts

gem includes agreements on data structures, which used by meta commit gem to interact with extensions.

Contracts (and their responsibilities) :

• Ast
  • stores information about which parser built it
  • stores abstract syntax tree
  • provides access to children nodes
  • provides access to first line number and last line number
• Parser
  • builds ast node from code string
  • knows about file extensions he supports
  • knows about syntax he supports
• ContextualAst
  • stores information about which parser built target ast
  • stores target ast and all nodes
• Diff
  • builds human-readable message of change
  • knows what changes it can be used for
• ChangeContext
  • stores information about currently examined changes (line, commit id, file name, touched ast)
  • passed to diff as source of examined changes
• Locator
  • locates exported classes of extension

You can check documentation here

Add this line to your application's Gemfile:

gem 'meta_commit_contracts'

And then execute:

$ bundle

Or install it yourself as:

$ gem install meta_commit_contracts

Inherit components of extension from these classes and override appropriate methods