# abstract class Crystal::Macros::ASTNode

- Crystal::Macros::ASTNode
- Reference
- Object

##
Overview

This is the base class of all AST nodes. This methods are available to all AST nodes.

##
Direct Known Subclasses

- Crystal::Macros::Annotation
- Crystal::Macros::Arg
- Crystal::Macros::ArrayLiteral
- Crystal::Macros::Assign
- Crystal::Macros::BinaryOp
- Crystal::Macros::Block
- Crystal::Macros::BoolLiteral
- Crystal::Macros::Call
- Crystal::Macros::Case
- Crystal::Macros::Cast
- Crystal::Macros::CharLiteral
- Crystal::Macros::ClassDef
- Crystal::Macros::ClassVar
- Crystal::Macros::Def
- Crystal::Macros::Expressions
- Crystal::Macros::Generic
- Crystal::Macros::Global
- Crystal::Macros::HashLiteral
- Crystal::Macros::If
- Crystal::Macros::ImplicitObj
- Crystal::Macros::InstanceVar
- Crystal::Macros::IsA
- Crystal::Macros::Macro
- Crystal::Macros::MacroId
- Crystal::Macros::MetaVar
- Crystal::Macros::MultiAssign
- Crystal::Macros::NamedArgument
- Crystal::Macros::NamedTupleLiteral
- Crystal::Macros::NilableCast
- Crystal::Macros::NilLiteral
- Crystal::Macros::Nop
- Crystal::Macros::NumberLiteral
- Crystal::Macros::OffsetOf
- Crystal::Macros::Path
- Crystal::Macros::ProcLiteral
- Crystal::Macros::ProcNotation
- Crystal::Macros::ProcPointer
- Crystal::Macros::RangeLiteral
- Crystal::Macros::ReadInstanceVar
- Crystal::Macros::RegexLiteral
- Crystal::Macros::Require
- Crystal::Macros::RespondsTo
- Crystal::Macros::Splat
- Crystal::Macros::StringInterpolation
- Crystal::Macros::StringLiteral
- Crystal::Macros::SymbolLiteral
- Crystal::Macros::TupleLiteral
- Crystal::Macros::TypeDeclaration
- Crystal::Macros::TypeNode
- Crystal::Macros::UnaryExpression
- Crystal::Macros::UninitializedVar
- Crystal::Macros::Union
- Crystal::Macros::Var
- Crystal::Macros::VisibilityModifier
- Crystal::Macros::When
- Crystal::Macros::While

##
Defined in:

##
Instance Method Summary

- #!=(other : ASTNode) : BoolLiteral

  Returns `true` if this node's textual representation is not the same as the other node.

- #==(other : ASTNode) : BoolLiteral

  Returns `true` if this node's textual representation is the same as the other node.

- #class_name : StringLiteral

  Returns a `StringLiteral` that contains this node's name.

- #column_number : StringLiteral | NilLiteral

  Returns the column number where this node begins.

- #end_column_number : StringLiteral | NilLiteral

  Returns the column number where this node ends.

- #end_line_number : StringLiteral | NilLiteral

  Returns the line number where this node ends.

- #filename : StringLiteral | NilLiteral

  Returns the filename where this node is located.

- #id : MacroId

  Returns this node as a `MacroId`.

- #line_number : StringLiteral | NilLiteral

  Returns the line number where this node begins.

- #raise(message) : NoReturn

  Gives a compile-time error with the given message.

- #stringify : StringLiteral

  Returns a `StringLiteral` that contains this node's textual representation.

- #symbolize : SymbolLiteral

  Returns a `SymbolLiteral` that contains this node's textual representation.

### Instance methods inherited from class `Reference`

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil) same?, to_s(io : IO) : Nil to_s

### Constructor methods inherited from class `Reference`

new new

### Instance methods inherited from class `Object`

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, __crystal_pseudo_! : Bool __crystal_pseudo_!, __crystal_pseudo_as(type : Class) __crystal_pseudo_as, __crystal_pseudo_as?(type : Class) __crystal_pseudo_as?, __crystal_pseudo_is_a?(type : Class) : Bool __crystal_pseudo_is_a?, __crystal_pseudo_nil? : Bool __crystal_pseudo_nil?, __crystal_pseudo_responds_to?(name : Symbol) : Bool __crystal_pseudo_responds_to?, class class, dup dup, hash(hasher)
hash hash, inspect : String
inspect(io : IO) : Nil inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s : String
to_s(io : IO) : Nil to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

### Class methods inherited from class `Object`

from_json(string_or_io, root : String)
from_json(string_or_io) from_json, from_yaml(string_or_io : String | IO) from_yaml

##
Instance Method Detail

def !=(other : ASTNode) : BoolLiteral #

Returns `true` if this node's textual representation is not the same as the other node.

def ==(other : ASTNode) : BoolLiteral #

Returns `true` if this node's textual representation is the same as the other node.

def class_name : StringLiteral #

Returns a `StringLiteral` that contains this node's name.

    macro test
      {{ "foo".class_name }}
    end

    puts test # => prints StringLiteral

def column_number : StringLiteral | NilLiteral #

Returns the column number where this node begins. Might return `nil` if the location is not known.

The first column number in a line is `1`.

def end_column_number : StringLiteral | NilLiteral #

Returns the column number where this node ends. Might return `nil` if the location is not known.

The first column number in a line is `1`.

def end_line_number : StringLiteral | NilLiteral #

Returns the line number where this node ends. Might return `nil` if the location is not known.

The first line number in a file is `1`.

def filename : StringLiteral | NilLiteral #

Returns the filename where this node is located. Might return `nil` if the location is not known.

def id : MacroId #

Returns this node as a `MacroId`. Useful when you need an identifier out of a `StringLiteral`, `SymbolLiteral`, `Var` or `Call`.

    macro define_method(name, content)
      def {{name.id}}
        {{content}}
      end
    end

    define_method :foo, 1
    define_method "bar", 2
    define_method baz, 3

    puts foo # => prints 1
    puts bar # => prints 2
    puts baz # => prints 3

def line_number : StringLiteral | NilLiteral #

Returns the line number where this node begins. Might return `nil` if the location is not known.

The first line number in a file is 1.

def raise(message) : NoReturn #

Gives a compile-time error with the given message. This will highlight this node in the error message.

def stringify : StringLiteral #

Returns a `StringLiteral` that contains this node's textual representation. Note that invoking stringify on a string literal will return a `StringLiteral` that contains a string literal.

    macro test
      {{ "foo".stringify }}
    end

    puts test # prints "foo" (including the double quotes)

def symbolize : SymbolLiteral #

Returns a `SymbolLiteral` that contains this node's textual representation.

    {{ "foo".id.symbolize }} # => :foo