class RubyVM::AbstractSyntaxTree::Node

RubyVM::AbstractSyntaxTree::Node instances are created by parse methods in RubyVM::AbstractSyntaxTree.

This class is MRI specific.

Public Instance Methods

children → array click to toggle source

Returns AST nodes under this one. Each kind of node has different children, depending on what kind of node it is.

The returned array may contain other nodes or nil.

# File ast.rb, line 133
def children
  Primitive.ast_node_children
end

first_column → integer click to toggle source

The column number in the source code where this AST's text began.

# File ast.rb, line 106
def first_column
  Primitive.ast_node_first_column
end

first_lineno → integer click to toggle source

The line number in the source code where this AST's text began.

# File ast.rb, line 98
def first_lineno
  Primitive.ast_node_first_lineno
end

inspect → string click to toggle source

Returns debugging information about this node as a string.

# File ast.rb, line 141
def inspect
  Primitive.ast_node_inspect
end

last_column → integer click to toggle source

The column number in the source code where this AST's text ended.

# File ast.rb, line 122
def last_column
  Primitive.ast_node_last_column
end

last_lineno → integer click to toggle source

The line number in the source code where this AST's text ended.

# File ast.rb, line 114
def last_lineno
  Primitive.ast_node_last_lineno
end

pretty_print(q) click to toggle source

# File lib/pp.rb, line 547
def pretty_print(q)
  q.group(1, "(#{type}@#{first_lineno}:#{first_column}-#{last_lineno}:#{last_column}", ")") {
    case type
    when :SCOPE
      pretty_print_children(q, %w"tbl args body")
    when :ARGS
      pretty_print_children(q, %w[pre_num pre_init opt first_post post_num post_init rest kw kwrest block])
    when :DEFN
      pretty_print_children(q, %w[mid body])
    when :ARYPTN
      pretty_print_children(q, %w[const pre rest post])
    when :HSHPTN
      pretty_print_children(q, %w[const kw kwrest])
    else
      pretty_print_children(q)
    end
  }
end

pretty_print_children(q, names = []) click to toggle source

# File lib/pp.rb, line 534
def pretty_print_children(q, names = [])
  children.zip(names) do |c, n|
    if n
      q.breakable
      q.text "#{n}:"
    end
    q.group(2) do
      q.breakable
      q.pp c
    end
  end
end

type → symbol click to toggle source

Returns the type of this node as a symbol.

root = RubyVM::AbstractSyntaxTree.parse("x = 1 + 2")
root.type # => :SCOPE
lasgn = root.children[2]
lasgn.type # => :LASGN
call = lasgn.children[1]
call.type # => :OPCALL

# File ast.rb, line 90
def type
  Primitive.ast_node_type
end