Class: Jazzy::SymbolGraph::Graph

Inherits:
Object
  • Object
show all
Defined in:
lib/jazzy/symbol_graph/graph.rb

Overview

A Graph is the coordinator to import a symbolgraph json file. Deserialize it to Symbols and Relationships, then rebuild the AST shape using SymNodes and ExtNodes and extract SourceKit json.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(json, module_name) ⇒ Graph

Parse the JSON into flat tables of data



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# File 'lib/jazzy/symbol_graph/graph.rb', line 16

def initialize(json, module_name)
  self.module_name = module_name
  graph = JSON.parse(json, symbolize_names: true)

  self.symbol_nodes = {}
  graph[:symbols].each do |hash|
    symbol = Symbol.new(hash)
    symbol_nodes[symbol.usr] = SymNode.new(symbol)
  end

  self.relationships =
    graph[:relationships].map { |hash| Relationship.new(hash) }

  self.ext_nodes = {}
end

Instance Attribute Details

#ext_nodes ⇒ Object

(usr, constraints) -> ExtNode



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# File 'lib/jazzy/symbol_graph/graph.rb', line 13

def ext_nodes
  @ext_nodes
end

#module_name ⇒ Object

Returns the value of attribute module_name.



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# File 'lib/jazzy/symbol_graph/graph.rb', line 10

def module_name
  @module_name
end

#relationships ⇒ Object

Relationship


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# File 'lib/jazzy/symbol_graph/graph.rb', line 12

def relationships
  @relationships
end

#symbol_nodes ⇒ Object

usr -> SymNode



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# File 'lib/jazzy/symbol_graph/graph.rb', line 11

def symbol_nodes
  @symbol_nodes
end

Instance Method Details

#add_ext_conformance(type_usr, type_name, protocol, constraints) ⇒ Object 



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# File 'lib/jazzy/symbol_graph/graph.rb', line 49

def add_ext_conformance(type_usr,
                        type_name,
                        protocol,
                        constraints)
  key = ext_key(type_usr, constraints.ext)
  if ext_node = ext_nodes[key]
    ext_node.add_conformance(protocol)
  else
    ext_nodes[key] =
      ExtNode.new_for_conformance(type_usr,
                                  type_name,
                                  protocol,
                                  constraints)
  end
end

#add_ext_member(type_usr, member_node, constraints) ⇒ Object 



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# File 'lib/jazzy/symbol_graph/graph.rb', line 39

def add_ext_member(type_usr, member_node, constraints)
  key = ext_key(type_usr, constraints.ext)
  if ext_node = ext_nodes[key]
    ext_node.add_child(member_node)
  else
    ext_nodes[key] =
      ExtNode.new_for_member(type_usr, member_node, constraints)
  end
end

#ext_key(usr, constraints) ⇒ Object

ExtNode index. (type USR, extension constraints) -> ExtNode. This minimizes the number of extensions



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# File 'lib/jazzy/symbol_graph/graph.rb', line 35

def ext_key(usr, constraints)
  usr + constraints.map(&:to_swift).join
end

#rebuild_conformance(rel, source, target) ⇒ Object

“source : target” either from type decl or ext decl



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# File 'lib/jazzy/symbol_graph/graph.rb', line 101

def rebuild_conformance(rel, source, target)
  protocol_name = rel_target_name(rel, target)

  return if redundant_conformance?(rel, source, protocol_name)

  type_constraints = source&.constraints || []
  constraints =
    ExtConstraints.new(type_constraints,
                       rel.constraints - type_constraints)

  # Create an extension or enhance an existing one
  add_ext_conformance(rel.source_usr,
                      rel_source_name(rel, source),
                      protocol_name,
                      constraints)
end

#rebuild_default_implementation(_rel, source, target) ⇒ Object

“source is a default implementation of protocol requirement target”



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# File 'lib/jazzy/symbol_graph/graph.rb', line 119

def rebuild_default_implementation(_rel, source, target)
  return unless source

  unless target &&
         (target_parent = target.parent) &&
         target_parent.is_a?(SymNode)
    # Could probably figure this out with demangle, but...
    warn "Can't resolve membership of default implementation "\
      "#{source.symbol.usr}."
    source.unlisted = true
    return
  end
  constraints =
    ExtConstraints.new(target_parent.constraints,
                       source.unique_context_constraints(target_parent))

  add_ext_member(target_parent.symbol.usr,
                 source,
                 constraints)
end

#rebuild_inherits(_rel, source, target) ⇒ Object

“source is a class that inherits from target”



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# File 'lib/jazzy/symbol_graph/graph.rb', line 141

def rebuild_inherits(_rel, source, target)
  if source && target
    source.superclass_name = target.symbol.name
  end
end

#rebuild_member(rel, source, target) ⇒ Object

source is a member/protocol requirement of target



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# File 'lib/jazzy/symbol_graph/graph.rb', line 86

def rebuild_member(rel, source, target)
  return unless source

  source.protocol_requirement = rel.protocol_requirement?
  constraints =
    ExtConstraints.new(target&.constraints,
                       source.unique_context_constraints(target))

  # Add to its parent or invent an extension
  unless target&.try_add_child(source, constraints.ext)
    add_ext_member(rel.target_usr, source, constraints)
  end
end

#rebuild_rel(rel) ⇒ Object

Process a structural relationship to link nodes



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# File 'lib/jazzy/symbol_graph/graph.rb', line 148

def rebuild_rel(rel)
  source = symbol_nodes[rel.source_usr]
  target = symbol_nodes[rel.target_usr]

  case rel.kind
  when :memberOf, :optionalRequirementOf, :requirementOf
    rebuild_member(rel, source, target)

  when :conformsTo
    rebuild_conformance(rel, source, target)

  when :defaultImplementationOf
    rebuild_default_implementation(rel, source, target)

  when :inheritsFrom
    rebuild_inherits(rel, source, target)
  end
  # don't seem to care about:
  # - overrides: not bothered, also unimplemented for protocols
end

#redundant_conformance?(rel, type, protocol) ⇒ Boolean

Protocol conformance is redundant if it’s unconditional and already expressed in the type’s declaration.

Returns:

  • (Boolean) 


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# File 'lib/jazzy/symbol_graph/graph.rb', line 81

def redundant_conformance?(rel, type, protocol)
  type && rel.constraints.empty? && type.conformance?(protocol)
end

#rel_source_name(rel, source_node) ⇒ Object

Same for the source end. Less help from the tool here



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# File 'lib/jazzy/symbol_graph/graph.rb', line 74

def rel_source_name(rel, source_node)
  source_node&.qualified_name ||
    Jazzy::SymbolGraph.demangle(rel.source_usr)
end

#rel_target_name(rel, target_node) ⇒ Object

Increasingly desparate ways to find the name of the symbol at the target end of a relationship



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# File 'lib/jazzy/symbol_graph/graph.rb', line 67

def rel_target_name(rel, target_node)
  target_node&.symbol&.name ||
    rel.target_fallback ||
    Jazzy::SymbolGraph.demangle(rel.target_usr)
end

#to_sourcekit ⇒ Object

Rebuild the AST structure and convert to SourceKit



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# File 'lib/jazzy/symbol_graph/graph.rb', line 170

def to_sourcekit
  # Do default impls after the others so we can find protocol
  # type nodes from protocol requirements.
  default_impls, other_rels =
    relationships.partition(&:default_implementation?)
  (other_rels + default_impls).each { |r| rebuild_rel(r) }

  root_symbol_nodes =
    symbol_nodes.values
      .select(&:top_level_decl?)
      .sort
      .map(&:to_sourcekit)

  root_ext_nodes =
    ext_nodes.values
      .sort
      .map { |n| n.to_sourcekit(module_name) }
  {
    'key.diagnostic_stage' => 'parse',
    'key.substructure' => root_symbol_nodes + root_ext_nodes,
  }
end