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Class: Prism::RipperCompat

Relationships & Source Files
Namespace Children
Classes:
SexpBuilder, SexpBuilderPP
Extension / Inclusion / Inheritance Descendants
Subclasses:
SexpBuilder, SexpBuilderPP
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Visitor
Instance Chain:
self, Visitor
Inherits: Visitor
Defined in: lib/prism/ripper_compat.rb

Overview

Note: This integration is not finished, and therefore still has many inconsistencies with Ripper. If you’d like to help out, pull requests would be greatly appreciated!

This class is meant to provide a compatibility layer between prism and Ripper. It functions by parsing the entire tree first and then walking it and executing each of the Ripper callbacks as it goes.

This class is going to necessarily be slower than the native Ripper API. It is meant as a stopgap until developers migrate to using prism. It is also meant as a test harness for the prism parser.

To use this class, you treat RipperCompat effectively as you would treat the Ripper class.

Class Method Summary

Instance Attribute Summary

  • #column readonly

    The current column number of the parser.

  • #error? ⇒ Boolean readonly

    True if the parser encountered an error during parsing.

  • #lineno readonly

    The current line number of the parser.

  • #source readonly

    The source that is being parsed.

Instance Method Summary

Constructor Details

.new(source) ⇒ RipperCompat

Create a new RipperCompat object with the given source.

[ GitHub ] 

  


# File 'lib/prism/ripper_compat.rb', line 74



def initialize(source)
  @source = source
  @result = nil
  @lineno = nil
  @column = nil
end


  







Class Method Details



  

    .sexp(source)  
  



  

    

This is a convenience method that runs the RipperCompat::SexpBuilderPP subclass parser.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 171



def self.sexp(source)
  SexpBuilderPP.new(source).parse
end


  








  

    .sexp_raw(source)  
  



  

    

This is a convenience method that runs the RipperCompat::SexpBuilder subclass parser.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 166



def self.sexp_raw(source)
  SexpBuilder.new(source).parse
end


  







Instance Attribute Details



  

    #column   (readonly)
  



  

    

The current column number of the parser.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 71



attr_reader :column


  








  

    #error?  ⇒ Boolean  (readonly)
  



  

    

True if the parser encountered an error during parsing.


  





  


  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 86



def error?
  result.failure?
end


  








  

    #lineno   (readonly)
  



  

    

The current line number of the parser.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 68



attr_reader :lineno


  








  

    #source   (readonly)
  



  

    

The source that is being parsed.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 65



attr_reader :source


  







Instance Method Details



  

    #_dispatch0   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 192



def _dispatch0; end # :nodoc:


  








  

    #_dispatch1(_)   (private)
    Also known as: #on_parse_error
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 193



def _dispatch1(_); end # :nodoc:


  








  

    #_dispatch2(_, _)   (private)
    Also known as: #on_magic_comment
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 194



def _dispatch2(_, _); end # :nodoc:


  








  

    #_dispatch3(_, _, _)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 195



def _dispatch3(_, _, _); end # :nodoc:


  








  

    #_dispatch4(_, _, _, _)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 196



def _dispatch4(_, _, _, _); end # :nodoc:


  








  

    #_dispatch5(_, _, _, _, _)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 197



def _dispatch5(_, _, _, _, _); end # :nodoc:


  








  

    #_dispatch7(_, _, _, _, _, _, _)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 198



def _dispatch7(_, _, _, _, _, _, _); end # :nodoc:


  








  

    #bounds(location)   (private)
  



  

    

This method is responsible for updating lineno and column information to reflect the current node.



This method could be drastically improved with some caching on the start of every line, but for now it’s good enough.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 182



def bounds(location)
  @lineno = location.start_line
  @column = location.start_column
end


  








  

    #on_magic_comment(_, _)   (private)
  



  

    

Alias for #_dispatch2.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 201



alias_method :on_magic_comment, :_dispatch2


  








  

    #on_parse_error(_)   (private)
  



  

    

Alias for #_dispatch1.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 200



alias_method :on_parse_error, :_dispatch1


  








  

    #parse  
  



  

    

Parse the source and return the result.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 91



def parse
  result.magic_comments.each do |magic_comment|
    on_magic_comment(magic_comment.key, magic_comment.value)
  end

  if error?
    result.errors.each do |error|
      on_parse_error(error.message)
    end
  else
    result.value.accept(self)
  end
end


  








  

    #result   (private)
  



  

    

Lazily initialize the parse result.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 188



def result
  @result ||= Prism.parse(source)
end


  








  

    #visit_call_node(node)  
  



  

    

Visit a CallNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 110



def visit_call_node(node)
  if !node.message.match?(/^[[:alpha:]_]/) && node.opening_loc.nil? && node.arguments&.arguments&.length == 1
    left = visit(node.receiver)
    right = visit(node.arguments.arguments.first)

    bounds(node.location)
    on_binary(left, node.name, right)
  else
    raise NotImplementedError
  end
end


  








  

    #visit_float_node(node)  
  



  

    

Visit a FloatNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 123



def visit_float_node(node)
  bounds(node.location)
  on_float(node.slice)
end


  








  

    #visit_imaginary_node(node)  
  



  

    

Visit a ImaginaryNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 129



def visit_imaginary_node(node)
  bounds(node.location)
  on_imaginary(node.slice)
end


  








  

    #visit_integer_node(node)  
  



  

    

Visit an IntegerNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 135



def visit_integer_node(node)
  bounds(node.location)
  on_int(node.slice)
end


  








  

    #visit_program_node(node)  
  



  

    

Visit a ProgramNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 155



def visit_program_node(node)
  statements = visit(node.statements)
  bounds(node.location)
  on_program(statements)
end


  








  

    #visit_rational_node(node)  
  



  

    

Visit a RationalNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 141



def visit_rational_node(node)
  bounds(node.location)
  on_rational(node.slice)
end


  








  

    #visit_statements_node(node)  
  



  

    

Visit a StatementsNode node.


  



  [ GitHub ]


  

  


# File 'lib/prism/ripper_compat.rb', line 147



def visit_statements_node(node)
  bounds(node.location)
  node.body.inject(on_stmts_new) do |stmts, stmt|
    on_stmts_add(stmts, visit(stmt))
  end
end