Class: Prism::Merge::BeginNodeMergePlanner

Inherits:
Object
  • Object
show all
Defined in:
lib/prism/merge/begin_node_merge_planner.rb

Defined Under Namespace

Classes: Step

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(merger:, template_node:, dest_node:, node_preference:) ⇒ BeginNodeMergePlanner

Returns a new instance of BeginNodeMergePlanner.



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# File 'lib/prism/merge/begin_node_merge_planner.rb', line 23

def initialize(merger:, template_node:, dest_node:, node_preference:)
  @merger = merger
  @template_node = template_node
  @dest_node = dest_node
  @node_preference = node_preference
end

Instance Attribute Details

#dest_node ⇒ Object (readonly)

Returns the value of attribute dest_node.



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# File 'lib/prism/merge/begin_node_merge_planner.rb', line 21

def dest_node
  @dest_node
end

#merger ⇒ Object (readonly)

Returns the value of attribute merger.



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# File 'lib/prism/merge/begin_node_merge_planner.rb', line 21

def merger
  @merger
end

#node_preference ⇒ Object (readonly)

Returns the value of attribute node_preference.



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# File 'lib/prism/merge/begin_node_merge_planner.rb', line 21

def node_preference
  @node_preference
end

#template_node ⇒ Object (readonly)

Returns the value of attribute template_node.



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# File 'lib/prism/merge/begin_node_merge_planner.rb', line 21

def template_node
  @template_node
end

Instance Method Details

#plan ⇒ Object 



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# File 'lib/prism/merge/begin_node_merge_planner.rb', line 30

def plan
  template_clause_regions = clause_regions_by_type(template_node)
  dest_clause_regions = clause_regions_by_type(dest_node)
  template_clause_nodes = merger.send(:begin_node_clause_nodes_by_type, template_node)
  dest_clause_nodes = merger.send(:begin_node_clause_nodes_by_type, dest_node)
  return [] if template_clause_regions.empty? && dest_clause_regions.empty?

  clause_types = if node_preference == :template
                   merger.send(:merge_ordered_clause_types, template_clause_regions.keys,
                               dest_clause_regions.keys)
                 else
                   merger.send(:merge_ordered_clause_types, dest_clause_regions.keys,
                               template_clause_regions.keys)
                 end
  clause_types = merger.send(:canonicalize_rescue_clause_order, clause_types)
  clause_types = merger.send(:canonicalize_begin_clause_kind_order, clause_types)

  clause_types.each_with_object([]) do |clause_type, steps|
    template_region = template_clause_regions[clause_type]
    dest_region = dest_clause_regions[clause_type]
    template_clause_node = template_clause_nodes[clause_type]
    dest_clause_node = dest_clause_nodes[clause_type]

    if template_region && dest_region && template_clause_node && dest_clause_node
      merged_step = build_shared_clause_step(
        clause_type: clause_type,
        template_region: template_region,
        dest_region: dest_region,
        template_clause_node: template_clause_node,
        dest_clause_node: dest_clause_node
      )
      steps << merged_step
      next
    end

    unmatched_step = build_unmatched_clause_step(
      clause_type: clause_type,
      template_region: template_region,
      dest_region: dest_region,
      template_clause_node: template_clause_node,
      dest_clause_node: dest_clause_node
    )
    steps << unmatched_step if unmatched_step
  end
end