Class: Yard2steep::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/yard2steep/parser.rb

Constant Summary collapse

ANY_TYPE = 
'any'
ANY_BLOCK_TYPE = 
'{ (any) -> any }'

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/yard2steep/parser.rb', line 12

def initialize
  # Debug flag
  @debug = false

  # NOTE: set at parse
  @file = nil
end

Instance Method Details

#block_type_node(p) ⇒ AST::PTypeNode

Parameters:

  • p (String)

Returns:



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# File 'lib/yard2steep/parser.rb', line 716

def block_type_node(p)
  if @p_types[p]
    type = @p_types[p]
  else
    type = ANY_BLOCK_TYPE
  end

  AST::PTypeNode.new(
    p_type: type,
    p_name: p,
    kind:   AST::PTypeNode::KIND[:block],
  )
end

#debug_print!(message) ⇒ void

This method returns an undefined value.

Parameters:

  • message (String) 


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# File 'lib/yard2steep/parser.rb', line 694

def debug_print!(message)
  print "#{message}\n" if @debug
end

#getter_method_node(ivarname) ⇒ AST::MethodNode

Parameters:

  • ivarname (String)

Returns:



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# File 'lib/yard2steep/parser.rb', line 662

def getter_method_node(ivarname)
  AST::MethodNode.new(
    p_list: [],
    r_type: ANY_TYPE,
    m_name: ivarname,
  )
end

#parse(file, text, debug: false) ⇒ AST::ClassNode

Parameters:

  • file (String)
  • text (String)
  • debug (bool) (defaults to: false)

Returns:



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# File 'lib/yard2steep/parser.rb', line 24

def parse(file, text, debug: false)
  @debug = debug

  @file = file
  debug_print!("Start parsing: #{file}")

  @comments = Comments.new(text)

  main = AST::ClassNode.create_main
  @ast = main

  # NOTE: reset class context
  @current_class = main

  parse_program(text)

  @ast
end

#parse_assign(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 412

def parse_assign(r_ast)
  # NOTE: r_ast is array such as
  # [:assign,
  #   [:var_field, [:@const, "DNA", [1, 15]]],
  #   [...]]
  Util.assert! {
    r_ast[0] == :assign &&
      r_ast[1].is_a?(Array) &&
      r_ast[1][0] == :var_field
  }
  var_type = r_ast[1][1][0]
  if var_type == :@const
    parse_assign_constant(name: r_ast[1][1][1], v_ast: r_ast[2])
  end
end

#parse_assign_constant(name:, v_ast:) ⇒ void

This method returns an undefined value.

Parameters:

  • name (String)
  • v_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 431

def parse_assign_constant(name:, v_ast:)
  c = AST::ConstantNode.new(
    name:   name,
    klass:  @current_class,
    v_type: type_of(v_ast),
  )
  @current_class.append_constant(c)
end

#parse_attr_accessor(ivars) ⇒ void

This method returns an undefined value.

Parameters:

  • ivars (Array<String>) 


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# File 'lib/yard2steep/parser.rb', line 646

def parse_attr_accessor(ivars)
  ivars.each do |ivarname|
    @current_class.append_ivar(
      AST::IVarNode.new(
        name: ivarname
      )
    )

    # NOTE: attr_accessor should add getter and setter methods
    @current_class.append_m(getter_method_node(ivarname))
    @current_class.append_m(setter_method_node(ivarname))
  end
end

#parse_attr_reader(ivars) ⇒ void

This method returns an undefined value.

Parameters:

  • ivars (Array<String>) 


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# File 'lib/yard2steep/parser.rb', line 616

def parse_attr_reader(ivars)
  ivars.each do |ivarname|
    @current_class.append_ivar(
      AST::IVarNode.new(
        name: ivarname
      )
    )

    # NOTE: attr_reader should add a getter method
    @current_class.append_m(getter_method_node(ivarname))
  end
end

#parse_attr_writer(ivars) ⇒ void

This method returns an undefined value.

Parameters:

  • ivars (Array<String>) 


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# File 'lib/yard2steep/parser.rb', line 631

def parse_attr_writer(ivars)
  ivars.each do |ivarname|
    @current_class.append_ivar(
      AST::IVarNode.new(
        name: ivarname
      )
    )

    # NOTE: attr_writer should add a setter method
    @current_class.append_m(setter_method_node(ivarname))
  end
end

#parse_bodystmt(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 399

def parse_bodystmt(r_ast)
  # NOTE:
  # [:bodystmt,
  #   [...]]
  Util.assert! {
    r_ast[0] == :bodystmt &&
      r_ast[1].is_a?(Array)
  }
  parse_stmts(r_ast[1])
end

#parse_class_or_module(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 342

def parse_class_or_module(r_ast)
  # NOTE: r_ast is array such as
  # [:class,
  #   [:const_ref, [:@const, "OtherClass", [119, 6]]],
  #   [:var_ref, [:@const, "MyClass", [119, 19]]],
  #   [:bodystmt, [...]]]

  kind = r_ast[0].to_s

  case kind
  when "class"
    Util.assert! { r_ast.size == 4 }
    c_name_node   = r_ast[1]
    super_c_node  = r_ast[2]
    bodystmt_node = r_ast[3]
  when "module"
    Util.assert! { r_ast.size == 3 }
    c_name_node   = r_ast[1]
    super_c_node  = nil
    bodystmt_node = r_ast[2]
  else
    raise "invalid kind: #{kind}"
  end

  Util.assert! {
    c_name_node[0] == :const_ref &&
      c_name_node[1].is_a?(Array) &&
      c_name_node[1][0] == :@const &&
      c_name_node[1][1].is_a?(String)
  }
  c_name = c_name_node[1][1]
  Util.assert! {
    !super_c_node || (
      super_c_node[0] == :var_ref &&
        super_c_node[1].is_a?(Array) &&
        super_c_node[1][0] == :@const &&
        super_c_node[1][1].is_a?(String)
    )
  }
  super_c_name = super_c_node ? super_c_node[1][1] : nil

  c = AST::ClassNode.new(
    kind:    kind,
    c_name:  c_name,
    super_c: super_c_name,
    parent:  @current_class,
  )
  @current_class.append_child(c)
  @current_class = c

  parse_bodystmt(bodystmt_node)

  @current_class = @current_class.parent
end

#parse_command(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 497

def parse_command(r_ast)
  # NOTE: r_ast is array such as
  # [:command,
  #   [:@ident, "attr_reader", [1, 15]],
  #   [:args_add_block,
  #     [
  #       [:symbol_literal, [:symbol, [:@ident, "ok", [1, 28]]]]
  #     ],
  #     false
  #   ]
  # ]
  Util.assert! {
    r_ast[0] == :command &&
      r_ast[1].is_a?(Array)
  }

  # NOTE: check attr_*
  if r_ast[1][0] == :@ident
    case r_ast[1][1]
    when "attr_reader"
      parse_attr_reader(parse_command_args_add_block(r_ast[2]))
    when "attr_writer"
      parse_attr_writer(parse_command_args_add_block(r_ast[2]))
    when "attr_accessor"
      parse_attr_accessor(parse_command_args_add_block(r_ast[2]))
    end

    # Do nothing for other case
  end
end

#parse_command_args_add_block(r_ast) ⇒ Array<String>

Parameters:

  • r_ast (Array)

Returns:

  • (Array<String>) 


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# File 'lib/yard2steep/parser.rb', line 530

def parse_command_args_add_block(r_ast)
  # NOTE: r_ast is array such as
  #
  # [:args_add_block,
  #   [
  #     [:symbol_literal, [:symbol, [:@ident, "ok", [1, 28]]]],
  #     [:symbol_literal, [:symbol, [:@ident, "no", [1, 33]]]],
  #     [:string_literal, [:string_content, [:@tstring_content, "b", [1, 38]]]]
  #   ],
  #   false
  # ]
  Util.assert! {
    r_ast[0] == :args_add_block &&
      r_ast[1].is_a?(Array)
  }
  r = []
  r_ast[1].each do |ast|
    case ast[0]
    when :symbol_literal
      Util.assert! {
        ast[1].is_a?(Array) &&
          ast[1][0] == :symbol &&
          ast[1][1].is_a?(Array) &&
          ast[1][1][0] == :@ident &&
          ast[1][1][1].is_a?(String)
      }
      r.push(ast[1][1][1])
    when :string_literal
      Util.assert! {
        ast[1].is_a?(Array) &&
          ast[1][0] == :string_content &&
          ast[1][1].is_a?(Array) &&
          ast[1][1][0] == :@tstring_content &&
          ast[1][1][1].is_a?(String)
      }
      r.push(ast[1][1][1])
    end
    # Do nothing for other case
  end
  r
end

#parse_def(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 119

def parse_def(r_ast)
  # NOTE: r_ast is array such as
  # [:def,
  #   [:@ident, "first", [3, 4]],
  #   [:paren, [:params, ...]],
  #   [:bodystmt, [[:array, nil]], nil, nil, nil]]]

  Util.assert! {
    r_ast.size == 4 &&
      r_ast[0] == :def &&
      r_ast[1][0] == :@ident &&
      r_ast[1][1].is_a?(String) &&
      r_ast[1][2].is_a?(Array)
  }

  m_name = r_ast[1][1]
  m_loc  = r_ast[1][2][0]
  params = r_ast[2]
  # NOTE: We also want to check bodystmt
  # bodystmt = r_ast[3]

  parse_method_impl(m_name, m_loc, params)
end

#parse_defs(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 87

def parse_defs(r_ast)
  # NOTE: r_ast is array such as
  # [:defs,
  #   [:var_ref, [:@kw, "self", [1, 14]]],
  #   [:@period, ".", [1, 18]],
  #   [:@ident, "my_method", [1, 19]],
  #   [:params, nil, nil, nil, nil, nil, nil, nil],
  #   [:bodystmt, [[:void_stmt]], nil, nil, nil]]

  Util.assert! {
    r_ast.size == 6 &&
      r_ast[0] == :defs &&
        r_ast[1][0] == :var_ref &&
        r_ast[1][1][0] == :@kw &&
        r_ast[1][1][1].is_a?(String) &&
        r_ast[1][1][2].is_a?(Array) &&
        r_ast[2][0] == :@period &&
        r_ast[3][0] == :@ident &&
        r_ast[3][1].is_a?(String)
  }

  m_name = "#{r_ast[1][1][1]}.#{r_ast[3][1]}"
  m_loc  = r_ast[1][1][2][0]
  params = r_ast[4]
  # NOTE: We also want to check bodystmt
  # bodystmt = r_ast[5]

  parse_method_impl(m_name, m_loc, params)
end

#parse_method_add_arg(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 574

def parse_method_add_arg(r_ast)
  # NOTE: r_ast is Array such as
  # [:method_add_arg,
  #   [:fcall, [:@ident, "attr_reader", [1, 15]]],
  #   [:arg_paren,
  #     [
  #       :args_add_block,
  #       [
  #         [:symbol_literal, [:symbol, [:@ident, "ok", [1, 28]]]]
  #       ],
  #       false
  #     ]
  #   ]
  # ]
  Util.assert! {
    r_ast[0] == :method_add_arg &&
      r_ast[1].is_a?(Array) &&
      r_ast[1][0] == :fcall &&
      r_ast[1][1].is_a?(Array) &&
      r_ast[2].is_a?(Array) &&
      r_ast[2][0] == :arg_paren &&
      r_ast[2][1].is_a?(Array) &&
      r_ast[2][1][0] == :args_add_block &&
      r_ast[2][1][1].is_a?(Array)
  }

  # NOTE: check attr_*
  if r_ast[1][1][0] == :@ident
    case r_ast[1][1][1]
    when "attr_reader"
      parse_attr_reader(parse_command_args_add_block(r_ast[2][1]))
    when "attr_writer"
      parse_attr_writer(parse_command_args_add_block(r_ast[2][1]))
    when "attr_accessor"
      parse_attr_accessor(parse_command_args_add_block(r_ast[2][1]))
    end
    # Do nothing for other case
  end
end

#parse_method_impl(m_name, m_loc, params) ⇒ void

This method returns an undefined value.

Parameters:

  • m_name (String)
  • m_loc (Integer)
  • params (Array) 


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# File 'lib/yard2steep/parser.rb', line 147

def parse_method_impl(m_name, m_loc, params)
  within_context do
    @p_types, @r_type = @comments.parse_from(m_loc)

    p_list = parse_params(params)

    # NOTE: We also want to check bodystmt
    # parse_mbody(bodystmt)

    m_node = AST::MethodNode.new(
      p_list: p_list,
      r_type: (@r_type || ANY_TYPE),
      m_name: m_name,
    )
    @current_class.append_m(m_node)
  end
end

#parse_no_paren_params(params) ⇒ Array<AST::PNode>

Parameters:

  • params (Array)

Returns:



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# File 'lib/yard2steep/parser.rb', line 197

def parse_no_paren_params(params)
  # NOTE: params is array such as
  # [:params,
  #   nil,
  #   nil,
  #   nil,
  #   nil,
  #   [
  #     [
  #       [:@label, "contents:", [3, 10]],
  #       false
  #     ]
  #   ],
  #   nil,
  #   nil
  # ]],
  Util.assert! { params[0] == :params && params.size == 8 }

  r = []
  n_params = (params[1] || [])
  # NOTE: n_params is array such as
  # [[:@ident, "a", [1, 7]], ...]
  n_params.each do |key|
    # TODO(south37) Optimize this check
    Util.assert! { key[0] == :@ident && key[1].is_a?(String) }
    name = key[1]
    r.push(
      AST::PNode.new(
        type_node: type_node(name),
        style:     AST::PNode::STYLE[:normal],
      )
    )
  end

  v_params = (params[2] || [])
  # NOTE: v_params is array such as
  # [
  #   [
  #     [:@ident, "a", [1, 7]],
  #     [:@int, "2", [1, 9]]
  #   ],
  #   ...
  # ]
  v_params.each do |v_param|
    key, default_v = v_param

    # TODO(south37) Optimize this check
    Util.assert! {
      key[0] == :@ident &&
        key[1].is_a?(String) &&
        default_v.is_a?(Array)
    }
    name = key[1]
    r.push(
      AST::PNode.new(
        type_node: type_node(name),
        style:     AST::PNode::STYLE[:normal_with_default],
      )
    )
  end

  n_params2 = (params[4] || [])
  # NOTE: n_params2 is array such as
  # [[:@ident, "a", [1, 7]], ...]
  n_params2.each do |key|
    # TODO(south37) Optimize this check
    Util.assert! { key[0] == :@ident && key[1].is_a?(String) }
    name = key[1]
    r.push(
      AST::PNode.new(
        type_node: type_node(name),
        style:     AST::PNode::STYLE[:normal],
      )
    )
  end

  k_params = (params[5] || [])
  # NOTE: k_params is array such as
  # [
  #   [
  #     [:@label, "contents:", [3, 10]],
  #     false
  #   ],
  #   ...
  # ],
  k_params.each do |v_param|
    key, default_v = v_param

    # TODO(south37) Optimize this check
    Util.assert! {
      key[0] == :@label &&
        key[1][-1] == ':'
    }
    name = key[1][0..-2]
    if default_v
      r.push(
        AST::PNode.new(
          type_node: type_node(name),
          style:     AST::PNode::STYLE[:keyword_with_default],
        )
      )
    else
      r.push(
        AST::PNode.new(
          type_node: type_node(name),
          style:     AST::PNode::STYLE[:keyword],
        )
      )
    end
  end

  b_param = params[7]
  # NOTE: b_params is array such as
  # [:blockarg, [:@ident, "block", [1, 8]]]
  if b_param
    Util.assert! {
      b_param[0] == :blockarg &&
        b_param[1].is_a?(Array) &&
        b_param[1][0] == :@ident &&
        b_param[1][1].is_a?(String)
    }
    name = b_param[1][1]
    r.push(
      AST::PNode.new(
        type_node: block_type_node(name),
        style:     AST::PNode::STYLE[:normal],
      )
    )
  end

  # NOTE: params[3] is `*a`, params[6] is `**a`

  r
end

#parse_params(r_ast) ⇒ Array<AST::PNode>

Parameters:

  • r_ast (Array)

Returns:



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# File 'lib/yard2steep/parser.rb', line 168

def parse_params(r_ast)
  # NOTE: parrams is `paren_params` or `no_paren_params`
  # paren_params: [:paren, [:params, ...]]
  # no_paren_params: [:params, ...]
  case r_ast[0]
  when :paren
    parse_paren_params(r_ast)
  when :params
    parse_no_paren_params(r_ast)
  else
    raise "invalid node"
  end
end

#parse_paren_params(r_ast) ⇒ Array<AST::PNode>

Parameters:

  • r_ast (Array)

Returns:



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# File 'lib/yard2steep/parser.rb', line 184

def parse_paren_params(r_ast)
  # NOTE: r_ast is array such as
  # [:paren, [:params, ...]]
  Util.assert! {
    r_ast[0] == :paren &&
      r_ast[1].is_a?(Array) &&
      r_ast[1][0] == :params
  }
  parse_no_paren_params(r_ast[1])
end

#parse_program(text) ⇒ void

This method returns an undefined value.

Parameters:

  • text (String) 


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# File 'lib/yard2steep/parser.rb', line 45

def parse_program(text)
  r_ast = Ripper.sexp(text)
  # NOTE: r_ast is array such as
  # [:program,
  #   [...]]
  Util.assert! { r_ast[0] == :program && r_ast[1].is_a?(Array) }
  parse_stmts(r_ast[1])
end

#parse_stmt(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 64

def parse_stmt(r_ast)
  n_type = r_ast[0]

  case n_type
  when :defs
    parse_defs(r_ast)
  when :def
    parse_def(r_ast)
  when :class, :module
    parse_class_or_module(r_ast)
  when :assign
    parse_assign(r_ast)
  when :command
    parse_command(r_ast)
  when :method_add_arg
    parse_method_add_arg(r_ast)
  end

  # Do nothing for other stmt
end

#parse_stmts(r_ast) ⇒ void

This method returns an undefined value.

Parameters:

  • r_ast (Array) 


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# File 'lib/yard2steep/parser.rb', line 56

def parse_stmts(r_ast)
  r_ast.each do |node|
    parse_stmt(node)
  end
end

#setter_method_node(ivarname) ⇒ AST::MethodNode

Parameters:

  • ivarname (String)

Returns:



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# File 'lib/yard2steep/parser.rb', line 672

def setter_method_node(ivarname)
  AST::MethodNode.new(
    p_list: [
      AST::PNode.new(
        type_node: AST::PTypeNode.new(
          p_type: ANY_TYPE,
          p_name: '',
          kind:   AST::PTypeNode::KIND[:normal],
        ),
        style: AST::PNode::STYLE[:normal],
      )
    ],
    r_type: ANY_TYPE,
    m_name: "#{ivarname}=",
  )
end

#type_node(p) ⇒ AST::PTypeNode

Parameters:

  • p (String)

Returns:



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# File 'lib/yard2steep/parser.rb', line 700

def type_node(p)
  if @p_types[p]
    type = @p_types[p]
  else
    type = ANY_TYPE
  end

  AST::PTypeNode.new(
    p_type: type,
    p_name: p,
    kind:   AST::PTypeNode::KIND[:normal],
  )
end

#type_of(r_ast) ⇒ String

Parameters:

  • r_ast (Array)

Returns:

  • (String) 


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# File 'lib/yard2steep/parser.rb', line 442

def type_of(r_ast)
  # NOTE: r_ast is array such as
  #
  # String example:
  # [:string_literal,
  #   [:string_content,
  #     [:@tstring_content, "String...", [34, 15]]
  #   ]
  # ]
  #
  # Regexp example:
  # [:regexp_literal,
  #   [
  #     [:@tstring_content, "this is re", [35, 15]]
  #   ],
  #   [:@regexp_end, "/", [35, 25]]
  # ]
  #
  # nil example:
  # [:var_ref, [:@kw, "nil", [40, 14]]]

  case r_ast[0]
  when :string_literal
    'String'
  when :regexp_literal
    'Regexp'
  when :symbol_literal
    'Symbol'
  when :dot2
    'Range<any>'
  when :@int
    'Integer'
  when :@float
    'Float'
  when :array
    'Array<any>'  # TODO(south37): check type of element
  when :hash
    'Hash<any, any>'  # TODO(south37): check type of element
  when :var_ref
    Util.assert! { r_ast[1].is_a?(Array) && r_ast[1][0] == :@kw }
    case r_ast[1][1]
    when 'true', 'false'
      'bool'
    when 'nil'
      'nil'
    else
      'any'
    end
  else
    'any'
  end
end

#within_context(&block) ⇒ void

This method returns an undefined value.



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# File 'lib/yard2steep/parser.rb', line 333

def within_context(&block)
  # Current method context.
  @p_types = {}
  @r_type  = nil
  block.call
end