Class: SyntaxTree::LanguageServer::InlayHints

Inherits:
Object
  • Object
show all
Defined in:
lib/syntax_tree/language_server/inlay_hints.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ InlayHints

Returns a new instance of InlayHints.



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# File 'lib/syntax_tree/language_server/inlay_hints.rb', line 8

def initialize
  @before = Hash.new { |hash, key| hash[key] = +"" }
  @after = Hash.new { |hash, key| hash[key] = +"" }
end

Instance Attribute Details

#after ⇒ Object (readonly)

Returns the value of attribute after.



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# File 'lib/syntax_tree/language_server/inlay_hints.rb', line 6

def after
  @after
end

#before ⇒ Object (readonly)

Returns the value of attribute before.



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# File 'lib/syntax_tree/language_server/inlay_hints.rb', line 6

def before
  @before
end

Class Method Details

.find(program) ⇒ Object 



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# File 'lib/syntax_tree/language_server/inlay_hints.rb', line 44

def self.find(program)
  inlay_hints = new
  queue = [[nil, program]]

  until queue.empty?
    parent_node, child_node = queue.shift

    child_node.child_nodes.each do |grand_child_node|
      queue << [child_node, grand_child_node] if grand_child_node
    end

    case [parent_node, child_node]
    in _, Rescue[exception: nil, location:]
      inlay_hints.bare_rescue(location)
    in Assign | Binary | IfOp | OpAssign, IfOp[location:]
      inlay_hints.precedence_parentheses(location)
    in Assign | OpAssign, Binary[location:]
      inlay_hints.precedence_parentheses(location)
    in Binary[operator: parent_oper], Binary[operator: child_oper, location:] if parent_oper != child_oper
      inlay_hints.precedence_parentheses(location)
    in Binary, Unary[operator: "-", location:]
      inlay_hints.precedence_parentheses(location)
    in Params, Assign[location:]
      inlay_hints.precedence_parentheses(location)
    else
      # do nothing
    end
  end

  inlay_hints
end

Instance Method Details

#bare_rescue(location) ⇒ Object

Adds the implicitly rescued StandardError into a bare rescue clause. For example,

begin
rescue
end

becomes

begin
rescue StandardError
end



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# File 'lib/syntax_tree/language_server/inlay_hints.rb', line 26

def bare_rescue(location)
  after[location.start_char + "rescue".length] << " StandardError"
end

#precedence_parentheses(location) ⇒ Object

Adds implicit parentheses around certain expressions to make it clear which subexpression will be evaluated first. For example,

a + b * c

becomes

a + 


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# File 'lib/syntax_tree/language_server/inlay_hints.rb', line 39

def precedence_parentheses(location)
  before[location.start_char] << "₍"
  after[location.end_char] << "₎"
end