Class: YARD::Parser::Ruby::AstNode

### Home Classes Methods

### In Files

- lib/yard/parser/ruby/ast_node.rb

### Parent

Array

### Methods

- ::new
- ::node_class_for
- #==
- #block?
- #call?
- #children
- #condition?
- #def?
- #file
- #first_line
- #full_source
- #has_line?
- #inspect
- #jump
- #kw?
- #line
- #line_range
- #literal?
- #loop?
- #pretty_print
- #ref?
- #show
- #source_range
- #token?
- #traverse
- #unfreeze

### Files

- LICENSE.txt
- MIT.txt

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No matching classes.

# YARD::Parser::Ruby::AstNode

An AST node is characterized by a type and a list of children. It is most easily represented by the s-expression {s} such as:

    # AST for "if true; 5 end":
    s(s(:if, s(:var_ref, s(:kw, "true")), s(s(:int, "5")), nil))

The node type is not considered part of the list, only its children. So +ast+ does not refer to the type, but rather the first child (or object). Items that are not `AstNode` objects can be part of the list, like Strings or Symbols representing names. To return only the AstNode children of the node, use {children}.

### Constants

KEYWORDS

  List of all known keywords @return [Hash]

### Attributes

comments[RW]
comments_hash_flag[RW]
comments_range[RW]
docstring[RW]
docstring_hash_flag[RW]
docstring_range[RW]
file[W]
full_source[W]
group[RW]

@deprecated Groups are now defined by directives @see Tags::GroupDirective

line_range[W]
parent[RW]

@return [AstNode, nil] the node's parent or nil if it is a root node.

source[RW]
source_range[W]
to_s[RW]
type[RW]

@return [Symbol] the node's unique symbolic type

### Public Class Methods

new(type, arr, opts = {}) click to toggle source

Creates a new AST node

@param [Symbol] type the type of node being created @param [Array<AstNode>] arr the child nodes @param [Hash] opts any extra line options @option opts [Fixnum] :line (nil) the line the node starts on in source @option opts [String] :char (nil) the character number the node starts on

    in source

@option opts [Fixnum] :listline (nil) a special key like :line but for

    list nodes

@option opts [Fixnum] :listchar (nil) a special key like :char but for

    list nodes

@option opts [Boolean] :token (nil) whether the node represents a token

    # File lib/yard/parser/ruby/ast_node.rb, line 152
    def initialize(type, arr, opts = {})
      super(arr)
      self.type = type
      self.line_range = opts[:line]
      self.source_range = opts[:char]
      @fallback_line = opts[:listline]
      @fallback_source = opts[:listchar]
      @token = true if opts[:token]
    end

node_class_for(type) click to toggle source

Finds the node subclass that should be instantiated for a specific node type

@param [Symbol] type the node type to find a subclass for @return [Class] a subclass of AstNode to instantiate the node with.

    # File lib/yard/parser/ruby/ast_node.rb, line 110
    def self.node_class_for(type)
      case type
      when :params
        ParameterNode
      when :call, :fcall, :vcall, :command, :command_call
        MethodCallNode
      when :if, :elsif, :if_mod, :unless, :unless_mod
        ConditionalNode
      when :for, :while, :while_mod, :until, :until_mod
        LoopNode
      when :def, :defs
        MethodDefinitionNode
      when :class, :sclass
        ClassNode
      when :module
        ModuleNode
      else
        if type.to_s =~ /_ref\Z/
          ReferenceNode
        elsif type.to_s =~ /_literal\Z/
          LiteralNode
        elsif KEYWORDS.has_key?(type)
          KeywordNode
        else
          AstNode
        end
      end
    end

### Public Instance Methods

==(ast) click to toggle source

@return [Boolean] whether the node is equal to another by checking

    the list and type

@private

    # File lib/yard/parser/ruby/ast_node.rb, line 165
    def ==(ast)
      super && type == ast.type
    end

block?() click to toggle source

@return [Boolean] whether the node has a block

    # File lib/yard/parser/ruby/ast_node.rb, line 258
    def block?
      respond_to?(:block) || condition?
    end

call?() click to toggle source

@return [Boolean] whether the node is a method call

    # File lib/yard/parser/ruby/ast_node.rb, line 238
    def call?
      false
    end

children() click to toggle source

@return [Array<AstNode>] the {AstNode} children inside the node

    # File lib/yard/parser/ruby/ast_node.rb, line 197
    def children
      @children ||= select {|e| AstNode === e }
    end

condition?() click to toggle source

@return [Boolean] whether the node is a if/elsif/else condition

    # File lib/yard/parser/ruby/ast_node.rb, line 248
    def condition?
      false
    end

def?() click to toggle source

@return [Boolean] whether the node is a method definition

    # File lib/yard/parser/ruby/ast_node.rb, line 243
    def def?
      false
    end

file() click to toggle source

@return [String] the filename the node was parsed from

    # File lib/yard/parser/ruby/ast_node.rb, line 75
    def file
      return parent.file if parent
      @file
    end

first_line() click to toggle source

@return [String] the first line of source represented by the node.

    # File lib/yard/parser/ruby/ast_node.rb, line 275
    def first_line
      full_source.split(/\r?\n/)[line - 1].strip
    end

full_source() click to toggle source

@return [String] the full source that the node was parsed from

    # File lib/yard/parser/ruby/ast_node.rb, line 81
    def full_source
      return parent.full_source if parent
      return @full_source if @full_source
      return IO.read(@file) if file && File.exist?(file)
    end

has_line?() click to toggle source

@return [Boolean] whether the node has a {line_range} set

    # File lib/yard/parser/ruby/ast_node.rb, line 265
    def has_line?
      @line_range ? true : false
    end

inspect() click to toggle source

@return [String] inspects the object

    # File lib/yard/parser/ruby/ast_node.rb, line 322
    def inspect
      typeinfo = type && type != :list ? ':' + type.to_s + ', ' : ''
      's(' + typeinfo + map(&:inspect).join(", ") + ')'
    end

jump(*node_types) click to toggle source

Searches through the node and all descendants and returns the first node with a type matching any of `node_types`, otherwise returns the original node (self).

@example Returns the first method definition in a block of code

    ast = YARD.parse_string("if true; def x; end end").ast
    ast.jump(:def)
    # => s(:def, s(:ident, "x"), s(:params, nil, nil, nil, nil,
    #      nil), s(s(:void_stmt, )))

@example Returns first 'def' or 'class' statement

    ast = YARD.parse_string("class X; def y; end end")
    ast.jump(:def, :class).first
    # =>

@example If the node types are not present in the AST

    ast = YARD.parse("def x; end")
    ast.jump(:def)

@param [Array<Symbol>] node_types a set of node types to match @return [AstNode] the matching node, if one was found @return [self] if no node was found

    # File lib/yard/parser/ruby/ast_node.rb, line 191
    def jump(*node_types)
      traverse {|child| return(child) if node_types.include?(child.type) }
      self
    end

kw?() click to toggle source

@return [Boolean] whether the node is a keyword

    # File lib/yard/parser/ruby/ast_node.rb, line 233
    def kw?
      false
    end

line() click to toggle source

@return [Fixnum] the starting line number of the node

    # File lib/yard/parser/ruby/ast_node.rb, line 270
    def line
      line_range && line_range.first
    end

line_range() click to toggle source

@return [Range] the line range in {full_source} represented

    by the node

    # File lib/yard/parser/ruby/ast_node.rb, line 69
    def line_range
      reset_line_info unless @line_range
      @line_range
    end

literal?() click to toggle source

@return [Boolean] whether the node is a literal value

    # File lib/yard/parser/ruby/ast_node.rb, line 228
    def literal?
      false
    end

loop?() click to toggle source

@return [Boolean] whether the node is a loop

    # File lib/yard/parser/ruby/ast_node.rb, line 253
    def loop?
      false
    end

pretty_print(q) click to toggle source

@return [nil] pretty prints the node

    # File lib/yard/parser/ruby/ast_node.rb, line 287
    def pretty_print(q)
      objs = self.dup + [:__last__]
      objs.unshift(type) if type && type != :list

      options = []
      if @docstring
        options << ['docstring', docstring]
      end
      if @source_range || @line_range
        options << ['line', line_range]
        options << ['source', source_range]
      end
      objs.pop if options.size == 0

      q.group(3, 's(', ')') do
        q.seplist(objs, nil, :each) do |v|
          if v == :__last__
            q.seplist(options, nil, :each) do |arr|
              k, v2 = *arr
              q.group(3) do
                q.text k
                q.group(3) do
                  q.text ': '
                  q.pp v2
                end
              end
            end
          else
            q.pp v
          end
        end
      end
    end

ref?() click to toggle source

@return [Boolean] whether the node is a reference (variable,

    constant name)

    # File lib/yard/parser/ruby/ast_node.rb, line 223
    def ref?
      false
    end

show() click to toggle source

@return [String] the first line of source the node represents

    # File lib/yard/parser/ruby/ast_node.rb, line 282
    def show
      "\t#{line}: #{first_line}"
    end

source_range() click to toggle source

@return [Range] the character range in {full_source} represented

    by the node

    # File lib/yard/parser/ruby/ast_node.rb, line 62
    def source_range
      reset_line_info unless @source_range
      @source_range
    end

token?() click to toggle source

@return [Boolean] whether the node is a token

    # File lib/yard/parser/ruby/ast_node.rb, line 217
    def token?
      @token
    end

traverse() click to toggle source

Traverses the object and yields each node (including descendants) in order.

@yield each descendant node in order @yieldparam [AstNode] self, or a child/descendant node @return [void]

    # File lib/yard/parser/ruby/ast_node.rb, line 206
    def traverse
      nodes = [self]
      nodes.each.with_index do |node, index|
        yield node
        nodes.insert index+1, *node.children
      end
    end

unfreeze() click to toggle source

Resets node state in tree

    # File lib/yard/parser/ruby/ast_node.rb, line 330
    def unfreeze
      @children = nil
    end

[Validate]

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