Class: Yadriggy::Rescue

Inherits:
ASTnode show all
Includes:
AstHelper
Defined in:
lib/yadriggy/ast.rb

Overview

begin-rescue-ensure.

raise is parsed as a method call (or a command).

Instance Attribute Summary collapse

Attributes inherited from ASTnode

#parent, #usertype

Class Method Summary collapse

Instance Method Summary collapse

Methods included from AstHelper

#has_tag?, #to_node, #to_nodes

Methods inherited from ASTnode

#add_child, #add_children, #const_value, #const_value_in_class, #get_context_class, #get_receiver_object, #is_proc?, #pretty_print, #root, #source_location, #source_location_string, #value, #value_in_class

Constructor Details

#initialize(rescue_expr, else_expr = nil, ensure_expr = nil) ⇒ Rescue

Returns a new instance of Rescue.



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# File 'lib/yadriggy/ast.rb', line 1465

def initialize(rescue_expr, else_expr=nil, ensure_expr=nil)
  if rescue_expr.nil?
    @types = []
    @parameter = nil
    @body = nil
    @nested_rescue = nil
  else
    expr = has_tag?(rescue_expr, :rescue)
    rescue_clause = expr[1]
    if rescue_clause.nil?
      @types = []
    elsif rescue_clause[0] == :mrhs_new_from_args
      types1 = to_nodes(rescue_clause[1])
      @types = types1 << to_node(rescue_clause[2])
    else
      @types = to_nodes(rescue_clause)
    end

    if expr[2].nil?
      @parameter = nil
    else
      @parameter = to_node(has_tag?(has_tag?(expr[2], :var_field)[1],
                                    :@ident))
    end

    @body = Exprs.make(expr[3])
    @nested_rescue = to_node(expr[4])
    add_children(@types)
    add_child(@parameter)
    add_child(@body)
    add_child(@nested_rescue)
  end

  if else_expr.nil?
    @else = nil
  else
    if !else_expr.nil? && else_expr[0].is_a?(Array)
      else_body = else_expr
    else
      # Ruby 2.4 or earlier
      elsexpr = has_tag?(else_expr, :else)
      else_body = else_expr[1]
    end
    @else = Exprs.make(else_body)
    add_child(@else)
  end

  if ensure_expr.nil?
    @ensure = nil
  else
    ensexpr = has_tag?(ensure_expr, :ensure)
    @ensure = Exprs.make(ensexpr[1])
    add_child(@ensure)
  end
end

Instance Attribute Details

#body ⇒ ASTnode|nil (readonly)

Returns the body of the rescue clause.

Returns:

  • (ASTnode|nil) —

    the body of the rescue clause.



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# File 'lib/yadriggy/ast.rb', line 1446

def body
  @body
end

#else ⇒ ASTnode|nil (readonly)

Returns the else clause.

Returns:

  • (ASTnode|nil) —

    the else clause.



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# File 'lib/yadriggy/ast.rb', line 1451

def else
  @else
end

#ensure ⇒ ASTnode|nil (readonly)

Returns the ensure clause.

Returns:

  • (ASTnode|nil) —

    the ensure clause.



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# File 'lib/yadriggy/ast.rb', line 1453

def ensure
  @ensure
end

#nested_rescue ⇒ Rescue|nil (readonly)

Returns the rest of rescue clauses. The returned object's #else and #ensure are nil.

Returns:

  • (Rescue|nil) —

    the rest of rescue clauses. The returned object's #else and #ensure are nil.



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# File 'lib/yadriggy/ast.rb', line 1449

def nested_rescue
  @nested_rescue
end

#parameter ⇒ ASTnode|nil (readonly)

Returns the rescue parameter.

Returns:

  • (ASTnode|nil) —

    the rescue parameter.



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# File 'lib/yadriggy/ast.rb', line 1444

def parameter
  @parameter
end

#types ⇒ Array<ASTnode> (readonly)

Returns the exception types. It may be empty.

Returns:

  • (Array<ASTnode>) —

    the exception types. It may be empty.



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# File 'lib/yadriggy/ast.rb', line 1442

def types
  @types
end

Class Method Details

.make(rescue_expr, else_expr, ensure_expr) ⇒ Object 



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# File 'lib/yadriggy/ast.rb', line 1457

def self.make(rescue_expr, else_expr, ensure_expr)
  if rescue_expr.nil? && else_expr.nil? && ensure_expr.nil?
    nil
  else
    Rescue.new(rescue_expr, else_expr, ensure_expr)
  end
end

.tag ⇒ Object 



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# File 'lib/yadriggy/ast.rb', line 1455

def self.tag() :rescue end

Instance Method Details

#accept(evaluator) ⇒ void

This method returns an undefined value.

A method for Visitor pattern.

Parameters:

  • evaluator (Eval) —

    the visitor of Visitor pattern.



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# File 'lib/yadriggy/ast.rb', line 1524

def accept(evaluator)
  evaluator.rescue_end(self)
end

#has_else? ⇒ Boolean

Returns true if the else clause is included.

Returns:

  • (Boolean) —

    true if the else clause is included.



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# File 'lib/yadriggy/ast.rb', line 1534

def has_else?
  !@else.nil?
end

#has_ensure? ⇒ Boolean

Returns true if the ensure clause is included.

Returns:

  • (Boolean) —

    true if the ensure clause is included.



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# File 'lib/yadriggy/ast.rb', line 1539

def has_ensure?
  !@ensure.nil?
end

#has_rescue? ⇒ Boolean

Returns true if the rescue clause is included.

Returns:

  • (Boolean) —

    true if the rescue clause is included.



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# File 'lib/yadriggy/ast.rb', line 1529

def has_rescue?
  !@body.nil?
end