Class: NodeMutation::ParserAdapter

Inherits:
Adapter
  • Object
show all
Defined in:
lib/node_mutation/parser_adapter.rb

Instance Method Summary collapse

Instance Method Details

#child_node_range(node, child_name) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 61

def child_node_range(node, child_name)
  direct_child_name, nested_child_name = child_name.to_s.split('.', 2)

  if node.is_a?(Array)
    if direct_child_name =~ INDEX_REGEXP
      child_node = node[direct_child_name.to_i]
      raise NodeMutation::MethodNotSupported, "#{direct_child_name} is not supported for #{get_source(node)}" unless child_node
      return child_node_range(child_node, nested_child_name) if nested_child_name
      return OpenStruct.new(start: child_node.loc.expression.begin_pos, end: child_node.loc.expression.end_pos)
    end

    raise NodeMutation::MethodNotSupported, "#{direct_child_name} is not supported for #{get_source(node)}" unless node.respond_to?(direct_child_name)
    child_node = node.send(direct_child_name)
    return child_node_range(child_node, nested_child_name) if nested_child_name
    return OpenStruct.new(
      start: child_node.loc.expression.begin_pos,
      end: child_node.loc.expression.end_pos
    )
  end

  case [node.type, child_name.to_sym]
  when %i[block pipes], %i[def parentheses], %i[defs parentheses]
    OpenStruct.new(
      start: node.arguments.first.loc.expression.begin_pos - 1,
      end: node.arguments.last.loc.expression.end_pos + 1
    )
  when %i[block arguments], %i[def arguments], %i[defs arguments]
    OpenStruct.new(
      start: node.arguments.first.loc.expression.begin_pos,
      end: node.arguments.last.loc.expression.end_pos
    )
  when %i[class name], %i[const name], %i[def name], %i[defs name]
    OpenStruct.new(start: node.loc.name.begin_pos, end: node.loc.name.end_pos)
  when %i[defs dot]
    OpenStruct.new(start: node.loc.operator.begin_pos, end: node.loc.operator.end_pos) if node.loc.operator
  when %i[defs self]
    OpenStruct.new(start: node.loc.operator.begin_pos - 'self'.length, end: node.loc.operator.begin_pos)
  when %i[send dot], %i[csend dot]
    OpenStruct.new(start: node.loc.dot.begin_pos, end: node.loc.dot.end_pos) if node.loc.dot
  when %i[send message], %i[csend message]
    if node.loc.operator
      OpenStruct.new(start: node.loc.selector.begin_pos, end: node.loc.operator.end_pos)
    else
      OpenStruct.new(start: node.loc.selector.begin_pos, end: node.loc.selector.end_pos)
    end
  when %i[send parentheses], %i[csend parentheses]
    if node.loc.begin && node.loc.end
      OpenStruct.new(start: node.loc.begin.begin_pos, end: node.loc.end.end_pos)
    end
  else
    raise NodeMutation::MethodNotSupported, "#{direct_child_name} is not supported for #{get_source(node)}" unless node.respond_to?(direct_child_name)

    child_node = node.send(direct_child_name)

    return child_node_range(child_node, nested_child_name) if nested_child_name

    return nil if child_node.nil?

    if child_node.is_a?(Parser::AST::Node)
      return(
        OpenStruct.new(
          start: child_node.loc.expression.begin_pos,
          end: child_node.loc.expression.end_pos
        )
      )
    end

    # arguments
    return nil if child_node.empty?

    return(
      OpenStruct.new(
        start: child_node.first.loc.expression.begin_pos,
        end: child_node.last.loc.expression.end_pos
      )
    )
  end
end

#file_content(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 57

def file_content(node)
  node.loc.expression.source_buffer.source
end

#get_end(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 144

def get_end(node)
  node.loc.expression.end_pos
end

#get_end_loc(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 153

def get_end_loc(node)
  end_loc = node.loc.expression.end
  OpenStruct.new(line: end_loc.line, column: end_loc.column)
end

#get_indent(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 158

def get_indent(node)
  file_content(node).split("\n")[get_start_loc(node).line - 1][/\A */].size
end

#get_source(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 6

def get_source(node)
  if node.is_a?(Array)
    source = file_content(node.first)
    source[node.first.loc.expression.begin_pos...node.last.loc.expression.end_pos]
  else
    node.loc.expression.source
  end
end

#get_start(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 140

def get_start(node)
  node.loc.expression.begin_pos
end

#get_start_loc(node) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 148

def get_start_loc(node)
  begin_loc = node.loc.expression.begin
  OpenStruct.new(line: begin_loc.line, column: begin_loc.column)
end

#rewritten_source(node, code) ⇒ Object 



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# File 'lib/node_mutation/parser_adapter.rb', line 15

def rewritten_source(node, code)
  code.gsub(/{{(.+?)}}/m) do
    old_code = Regexp.last_match(1)
    first_key = old_code.split('.').first
    if node.respond_to?(first_key)
      evaluated = child_node_by_name(node, old_code)
      case evaluated
      when Parser::AST::Node
        if evaluated.type == :args
          evaluated.loc.expression.source[1...-1]
        else
          evaluated.loc.expression.source
        end
      when Array
        if evaluated.size > 0
          file_source = file_content(evaluated.first)
          source = file_source[evaluated.first.loc.expression.begin_pos...evaluated.last.loc.expression.end_pos]
          lines = source.split "\n"
          lines_count = lines.length
          if lines_count > 1 && lines_count == evaluated.size
            new_code = []
            lines.each_with_index { |line, index|
              new_code << (index == 0 ? line : line[evaluated.first.indent - 2..-1])
            }
            new_code.join("\n")
          else
            source
          end
        end
      when String, Symbol, Integer, Float
        evaluated
      when NilClass
        ''
      else
        raise "can not parse \"#{code}\""
      end
    else
      raise NodeMutation::MethodNotSupported, "#{first_key} is not supported for #{get_source(node)}"
    end
  end
end