Class: SyntaxTree::Lambda

Inherits:
Node
  • Object
show all
Defined in:
lib/syntax_tree/node.rb

Overview

Lambda represents using a lambda literal (not the lambda method call).

->(value) { value * 2 }

Instance Attribute Summary collapse

Attributes inherited from Node

#location

Instance Method Summary collapse

Methods inherited from Node

#pretty_print, #to_json

Constructor Details

#initialize(params:, statements:, location:, comments: []) ⇒ Lambda

Returns a new instance of Lambda.



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# File 'lib/syntax_tree/node.rb', line 5282

def initialize(params:, statements:, location:, comments: [])
  @params = params
  @statements = statements
  @location = location
  @comments = comments
end

Instance Attribute Details

#comments ⇒ Object (readonly)

Array[ Comment | EmbDoc ]

the comments attached to this node



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# File 'lib/syntax_tree/node.rb', line 5280

def comments
  @comments
end

#params ⇒ Object (readonly)

Params | Paren

the parameter declaration for this lambda



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# File 'lib/syntax_tree/node.rb', line 5274

def params
  @params
end

#statements ⇒ Object (readonly)

BodyStmt | Statements

the expressions to be executed in this lambda



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# File 'lib/syntax_tree/node.rb', line 5277

def statements
  @statements
end

Instance Method Details

#accept(visitor) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 5289

def accept(visitor)
  visitor.visit_lambda(self)
end

#child_nodes ⇒ Object Also known as: deconstruct 



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# File 'lib/syntax_tree/node.rb', line 5293

def child_nodes
  [params, statements]
end

#deconstruct_keys(keys) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 5299

def deconstruct_keys(keys)
  {
    params: params,
    statements: statements,
    location: location,
    comments: comments
  }
end

#format(q) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 5308

def format(q)
  q.group(0, "->") do
    if params.is_a?(Paren)
      q.format(params) unless params.contents.empty?
    elsif !params.empty?
      q.group do
        q.text("(")
        q.format(params)
        q.text(")")
      end
    end

    q.text(" ")
    q.if_break do
      force_parens =
        q.parents.any? do |node|
          node.is_a?(Command) || node.is_a?(CommandCall)
        end

      q.text(force_parens ? "{" : "do")
      q.indent do
        q.breakable
        q.format(statements)
      end

      q.breakable
      q.text(force_parens ? "}" : "end")
    end.if_flat do
      q.text("{ ")
      q.format(statements)
      q.text(" }")
    end
  end
end