class Macros::MacroId

Overview

A fictitious node representing an idenfitifer like, foo, Bar or something_else.

The parser doesn't create this nodes. Instead, you create them by invoking #id on some nodes. For example, invoking #id on a StringLiteral returns a MacroId for the string's content. Similarly, invoking ID on a SymbolLiteral, Call, Var and Path return MacroIds for the node's content.

This allows you to treat strings, symbols, variables and calls unifomly. For example:

macro getter(name)
  def {{name.id}}
    @{{name.id}}
  end
end

getter unicorns
getter :unicorns
getter "unicorns"

All of the above macro calls work because we invoked #id, and the generated code looks like this:

def unicorns
  @unicorns
end

If we hand't use #id, the generated code would have been this:

def unicorns
  @unicorns
end

def :unicorns
  @:unicorns
end

def "unicorns"
  @"unicorns"
end

The last two definitions are invalid and so will give a compile-time error.

Defined in:

docs/macros.cr

Instance Method Summary

Instance methods inherited from class Macros::ASTNode

! : BoolLiteral !, !=(other : ASTNode) : BoolLiteral !=, ==(other : ASTNode) : BoolLiteral ==, class_name : StringLiteral class_name, id : MacroId id, is_a?(name) : BoolLiteral is_a?, raise(message) : NoReturn raise, stringify : StringLiteral stringify

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 +(other : StringLiteral | CharLiteral) : MacroId #

Similar to String#+.


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def =~(range : RegexLiteral) : BoolLiteral #

Similar to String#=~.


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def [](range : RangeLiteral) : MacroId #

Similar to String#[].


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def capitalize : MacroId #

Similar to String#capitalize.


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Similar to String#chars.


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def chomp : MacroId #

Similar to String#chomp.


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def downcase : MacroId #

Similar to String#downcase.


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def empty? : BoolLiteral #

Similar to String#empty?.


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def ends_with?(other : StringLiteral | CharLiteral) : BoolLiteral #

Similar to String#ends_with?.


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def gsub(regex : RegexLiteral, replacement : StringLiteral) : MacroId #

Similar to String#gsub.


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def id : MacroId #

Returns self.


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Similar to String#lines.


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def size : NumberLiteral #

Similar to String#size.


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Similar to String#split.


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Similar to String#split.


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def starts_with?(other : StringLiteral | CharLiteral) : BoolLiteral #

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def strip : MacroId #

Similar to String#strip.


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def tr(from : StringLiteral, to : StringLiteral) : MacroId #

Similar to String#tr.


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def upcase : MacroId #

Similar to String#upcase.


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