class YAML::Nodes::Builder

Overview

Builds a tree of YAML nodes.

This builder is similar to YAML::Builder, but instead of directly emitting the output to an IO it builds a YAML document tree in memory.

All "emitting" methods support specifying a "reference" object that will be associated to the emitted object, so that when that reference object is emitted again an anchor and an alias will be created. This generates both more compact documents and allows handling recursive data structures.

Defined in:

yaml/nodes/builder.cr

Constructors

Instance Method Summary

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) =~, class class, dup dup, hash(hasher)
hash
hash
, inspect(io : IO) : Nil
inspect : String
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(&block) 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(&block) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

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

Constructor Detail

def self.new #

[View source]

Instance Method Detail

def alias(anchor : String) : Nil #

Emits an alias to the given anchor.

require "yaml"

nodes_builder = YAML::Nodes::Builder.new

nodes_builder.mapping do
  nodes_builder.scalar "foo"
  nodes_builder.alias "key"
end

yaml = YAML.build do |builder|
  nodes_builder.document.to_yaml builder
end

yaml # => "---\nkey: *foo\n"

[View source]
def document : Document #

The document this builder builds.


[View source]
def mapping(anchor : String? = nil, tag : String? = nil, style : YAML::MappingStyle = YAML::MappingStyle::ANY, reference = nil, &block) : Nil #

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def merge(anchor : String) : Nil #

Emits the scalar "<<" followed by an alias to the given anchor.

See YAML Merge.

require "yaml"

nodes_builder = YAML::Nodes::Builder.new

nodes_builder.mapping do
  nodes_builder.merge "key"
end

yaml = YAML.build do |builder|
  nodes_builder.document.to_yaml builder
end

yaml # => "---\n<<: *key\n"

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def scalar(value, anchor : String? = nil, tag : String? = nil, style : YAML::ScalarStyle = YAML::ScalarStyle::ANY, reference = nil) : Nil #

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def sequence(anchor : String? = nil, tag : String? = nil, style : YAML::SequenceStyle = YAML::SequenceStyle::ANY, reference = nil, &block) : Nil #

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