abstract class Macros::ASTNode

Overview

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

Direct Known Subclasses

Defined in:

docs/macros.cr

Instance Method Summary

Instance methods inherited from class Reference

! !, ==(other)
==(other : self)
==
, hash hash, inspect(io : IO) : Nil inspect, nil? nil?, object_id object_id, same?(other : Nil)
same?(other : Reference)
same?
, to_s(io : IO) : Nil to_s

Instance methods inherited from class Object

! !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other) ===, =~(other) =~, class class, clone clone, crystal_type_id crystal_type_id, dup dup, hash hash, inspect
inspect(io : IO)
inspect
, itself itself, not_nil! not_nil!, tap(&block) tap, to_json to_json, to_pretty_json(io : IO)
to_pretty_json
to_pretty_json
, to_s
to_s(io : IO)
to_s
, to_yaml(io : IO)
to_yaml
to_yaml
, try(&block) try

Class methods inherited from class Object

==(other : Class) ==, ===(other) ===, cast(other) : self cast, from_json(string_or_io) from_json, from_yaml(string : String) from_yaml, hash hash, inspect(io) inspect, name : String name, to_s(io) to_s

Instance Method Detail

def ! : BoolLiteral #

Returns true if this node is falsey, and false if it's truthy.


[View source]
def !=(other : ASTNode) : BoolLiteral #

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


[View source]
def ==(other : ASTNode) : BoolLiteral #

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


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def class_name : StringLiteral #

Returns a StringLiteral that contains this node's name.

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

puts test # => prints StringLiteral

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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

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def is_a?(name) : BoolLiteral #

Tests if this node is of a specific type. For example:

macro test(node)
  {% if node.is_a?(NumberLiteral) %}
    puts "Got a number literal"
  {% else %}
    puts "Didn't get a number literal"
  {% end %}
end

test 1    # => prints "Got a number literal"
test "hi" # => prints "Didn't get a number literal"

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def raise(message) : NoReturn #

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


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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)

[View source]