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

#construct_keys, #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 6158

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 6156

def comments
  @comments
end

#params ⇒ Object (readonly)

LambdaVar | Paren

the parameter declaration for this lambda



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# File 'lib/syntax_tree/node.rb', line 6150

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 6153

def statements
  @statements
end

Instance Method Details

#accept(visitor) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 6165

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 6169

def child_nodes
  [params, statements]
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 6175

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 6184

def format(q)
  q.text("->")
  q.group do
    if params.is_a?(Paren)
      q.format(params) unless params.contents.empty?
    elsif params.empty? && params.comments.any?
      q.format(params)
    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

        if force_parens
          q.text("{")

          unless statements.empty?
            q.indent do
              q.breakable_space
              q.format(statements)
            end
            q.breakable_space
          end

          q.text("}")
        else
          q.text("do")

          unless statements.empty?
            q.indent do
              q.breakable_space
              q.format(statements)
            end
          end

          q.breakable_space
          q.text("end")
        end
      end
      .if_flat do
        q.text("{")

        unless statements.empty?
          q.text(" ")
          q.format(statements)
          q.text(" ")
        end

        q.text("}")
      end
  end
end