Method: ParserNodeExt.included

Defined in:
lib/parser_node_ext.rb

.included(base) ⇒ Object 



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# File 'lib/parser_node_ext.rb', line 121

def self.included(base)
  base.class_eval do
    # Dyamically defined method based on const TYPE_CHILDREN.
    TYPE_CHILDREN.values.flatten.uniq.each do |method_name|
      define_method(method_name) do
        index = TYPE_CHILDREN[type]&.index(method_name)
        return children[index] if index

        raise MethodNotSupported, "#{method_name} is not supported for #{self}"
      end
    end

    def full_name
      if %i[class module].include?(type)
        if parent&.respond_to?(:full_name)
          "#{parent.full_name}::#{name.to_source}"
        else
          name.to_source
        end
      end
    end

    # Get arguments of node.
    # It supports :block, :csend, :def, :defined?, :defs, :send, :yeild nodes.
    # @example
    #   node # s(:send, s(:const, nil, :FactoryGirl), :create, s(:sym, :post), s(:hash, s(:pair, s(:sym, :title), s(:str, "post"))))
    #   node.arguments # [s(:sym, :post), s(:hash, s(:pair, s(:sym, :title), s(:str, "post")))]
    # @return [Array<Parser::AST::Node>] arguments of node.
    # @raise [MethodNotSupported] if calls on other node.
    def arguments
      case type
      when :def
        children[1].type == :args ? children[1].children : [children[1]]
      when :defs
        children[2].type == :args ? children[2].children : [children[2]]
      when :block
        children[1].children
      when :send, :csend
        children[2..-1]
      when :defined?, :yield
        children
      else
        raise MethodNotSupported, "arguments is not supported for #{self}"
      end
    end

    # Get body of node.
    # It supports :begin, :block, :class, :def, :defs, :ensure, :for, :module, :numblock, resbody, :sclass, :until, :until_post, :while and :while_post node.
    # @example
    #   node # s(:block, s(:send, s(:const, nil, :RSpec), :configure), s(:args, s(:arg, :config)), s(:send, nil, :include, s(:const, s(:const, nil, :EmailSpec), :Helpers)))
    #   node.body # [s(:send, nil, :include, s(:const, s(:const, nil, :EmailSpec), :Helpers))]
    # @return [Array<Parser::AST::Node>] body of node.
    # @raise [MethodNotSupported] if calls on other node.
    def body
      case type
      when :begin, :kwbegin
        children
      when :rescue, :ensure, :preexe, :postexe
        return [] if children[0].nil?

        [:begin, :kwbegin].include?(children[0].type) ? children[0].body : [children[0]]
      when :when, :module, :sclass, :until, :until_post, :while, :while_post
        return [] if children[1].nil?

        [:begin, :kwbegin].include?(children[1].type) ? children[1].body : children[1..-1]
      when :def, :block, :class, :for, :in_pattern, :numblock, :resbody
        return [] if children[2].nil?

        [:begin, :kwbegin].include?(children[2].type) ? children[2].body : children[2..-1]
      when :defs
        return [] if children[3].nil?

        [:begin, :kwbegin].include?(children[3].type) ? children[3].body : children[3..-1]
      else
        raise MethodNotSupported, "body is not supported for #{self}"
      end
    end

    # Get when statements of case node.
    # @return [Array<Parser::AST::Node>] when statements of case node.
    # @raise [MethodNotSupported] if calls on other node.
    def when_statements
      if :case == type
        children[1...-1]
      else
        raise MethodNotSupported, "when_statements is not supported for #{self}"
      end
    end

    # Get rescue bodies of resuce node.
    # @return [Array<Parser::AST::Node>] rescue statements of rescue node.
    # @raise [MethodNotSupported] if calls on other node.
    def rescue_bodies
      if :rescue == type
        children[1...-1]
      else
        raise MethodNotSupported, "rescue_bodies is not supported for #{self}"
      end
    end

    # Get ensure body of ensure node.
    # @return [Array<Parser::AST::Node>] ensure body of ensure node.
    # @raise [MethodNotSupported] if calls on other node.
    def ensure_body
      if :ensure == type
        children[1..-1]
      else
        raise MethodNotSupported, "ensure_body is not supported for #{self}"
      end
    end

    # Get in statements of case_match node.
    # @return [Array<Parser::AST::Node>] in statements of case node.
    # @raise [MethodNotSupported] if calls on other node.
    def in_statements
      if :case_match == type
        children[1...-1]
      else
        raise MethodNotSupported, "in_statements is not supported for #{self}"
      end
    end

    # Get else statement of node.
    # @return [Parser::AST::Node] else statement of node.
    # @raise [MethodNotSupported] if calls on other node.
    def else_statement
      children[-1]
    end

    # Get elements of :array, :array_pattern, :array_pattern_with_tail, :find_pattern, :dstr, :dsym, :xstr, :regopt, :mlhs and :undef node.
    # @return [Array<Parser::AST::Node>] elements of array node.
    # @raise [MethodNotSupported] if calls on other node.
    def elements
      if %i[array array_pattern array_pattern_with_tail find_pattern dstr dsym xstr regopt mlhs undef].include?(type)
        children
      elsif type == :regexp
        children[0...-1]
      else
        raise MethodNotSupported, "elements is not supported for #{self}"
      end
    end

    # Get options of :regexp node.
    # @example
    #   node # s(:regexp, s(:str, "foo"), s(:regopt, :i, :m))
    #   node.options # s(:regopt, :i, :m)
    # @return [Parser::AST::Node] options of regexp node.
    # @raise [MethodNotSupported] if calls on other node.
    def options
      if :regexp == type
        children[-1]
      else
        raise MethodNotSupported, "options is not supported for #{self}"
      end
    end

    # Get exceptions of :resbody node.
    # @example
    #   node # s(:resbody, s(:array, (:const nil :Exception), (:const nil :A)), s(:lvasgn :bar), s(:int 1))
    #   node.exceptions # s(:array, (:const nil :Exception), (:const nil :A))
    # @return [Parser::AST::Node] exceptions of resbody node.
    # @raise [MethodNotSupported] if calls on other node.
    def exceptions
      if :resbody == type
        children[0]
      else
        raise MethodNotSupported, "exceptions is not supported for #{self}"
      end
    end

    # Get pairs of :hash and :hash_pattern node.
    # @example
    #   node # s(:hash, s(:pair, s(:sym, :foo), s(:sym, :bar)), s(:pair, s(:str, "foo"), s(:str, "bar")))
    #   node.pairs # [s(:pair, s(:sym, :foo), s(:sym, :bar)), s(:pair, s(:str, "foo"), s(:str, "bar"))]
    # @return [Array<Parser::AST::Node>] pairs of node.
    # @raise [MethodNotSupported] if calls on other node.
    def pairs
      if %i[hash hash_pattern].include?(type)
        children.select { |child| child.type == :pair }
      else
        raise MethodNotSupported, "pairs is not supported for #{self}"
      end
    end

    # Get keys of :hash node.
    # @example
    #   node # s(:hash, s(:pair, s(:sym, :foo), s(:sym, :bar)), s(:pair, s(:str, "foo"), s(:str, "bar")))
    #   node.keys # [s(:sym, :foo), s(:str, "foo")]
    # @return [Array<Parser::AST::Node>] keys of node.
    # @raise [MethodNotSupported] if calls on other node.
    def keys
      if %i[hash hash_pattern].include?(type)
        pairs.map(&:key)
      else
        raise MethodNotSupported, "keys is not supported for #{self}"
      end
    end

    # Get values of :hash node.
    # @example
    #   node # s(:hash, s(:pair, s(:sym, :foo), s(:sym, :bar)), s(:pair, s(:str, "foo"), s(:str, "bar")))
    #   node.values # [s(:sym, :bar), s(:str, "bar")]
    # @return [Array<Parser::AST::Node>] values of node.
    # @raise [MethodNotSupported] if calls on other node.
    def values
      if %i[hash hash_pattern].include?(type)
        pairs.map(&:value)
      else
        raise MethodNotSupported, "keys is not supported for #{self}"
      end
    end

    # Get kwsplats of :hash and :hash_pattern node.
    # @example
    #   node s(:hash, s(:pair, s(:int, 1), s(:int, 2)), s(:kwsplat, s(:send, nil, :bar)), s(:pair, s(:sym, :baz), s(:int, 3)))
    #   node.pairs # [s(:kwsplat, s(:send, nil, :bar))]
    # @return [Array<Parser::AST::Node>] kwplats of node.
    # @raise [MethodNotSupported] if calls on other node.
    def kwsplats
      if %i[hash hash_pattern].include?(type)
        children.select { |child| child.type == :kwsplat }
      else
        raise MethodNotSupported, "kwsplats is not supported for #{self}"
      end
    end

    # Return the exact value of node.
    # It supports :array, :begin, :erange, :false, :float, :irange, :int, :str, :sym and :true nodes.
    # @example
    #   node # s(:array, s(:str, "str"), s(:sym, :str))
    #   node.to_value # ['str', :str]
    # @return [Object] exact value.
    # @raise [MethodNotSupported] if calls on other node.
    def to_value
      case type
      when :int, :float, :str, :sym
        children.last
      when :true
        true
      when :false
        false
      when :nil
        nil
      when :array
        children.map(&:to_value)
      when :begin, :kwbegin
        children.first.to_value
      else
        self
      end
    end

    # Get the source code of node.
    #
    # @return [String] source code.
    def to_source
      loc.expression&.source
    end

    # Respond key value and source for hash node, e.g.
    # @example
    #   node # s(:hash, s(:pair, s(:sym, :foo), s(:sym, :bar)))
    #   node.foo_value # :bar
    #   node.foo_source # ":bar"
    def method_missing(method_name, *args, &block)
      if :args == type && children.respond_to?(method_name)
        return children.send(method_name, *args, &block)
      elsif :hash == type && method_name.to_s.end_with?('_pair')
        key = method_name.to_s[0..-6]
        return pairs.find { |pair| pair.key.to_value.to_s == key }
      elsif :hash == type && method_name.to_s.end_with?('_value')
        key = method_name.to_s[0..-7]
        return pairs.find { |pair| pair.key.to_value.to_s == key }&.value
      elsif :hash == type && method_name.to_s.end_with?('_source')
        key = method_name.to_s[0..-8]
        return pairs.find { |pair| pair.key.to_value.to_s == key }&.value&.to_source || ''
      end

      super
    end

    def respond_to_missing?(method_name, *args)
      if :args == type && children.respond_to?(method_name)
        return true
      elsif :hash == type && method_name.to_s.end_with?('_pair')
        key = method_name.to_s[0..-6]
        return !!pairs.find { |pair| pair.key.to_value.to_s == key }
      elsif :hash == type && method_name.to_s.end_with?('_value')
        key = method_name.to_s[0..-7]
        return !!pairs.find { |pair| pair.key.to_value.to_s == key }
      elsif :hash == type && method_name.to_s.end_with?('_source')
        key = method_name.to_s[0..-8]
        return !!pairs.find { |pair| pair.key.to_value.to_s == key }
      end

      super
    end
  end
end