class YAML::Builder

Overview

A YAML builder generates valid YAML.

A YAML::Error is raised if attempting to generate an invalid YAML (for example, if invoking #end_sequence without a matching #start_sequence)

require "yaml"

string = YAML.build do |yaml|
  yaml.mapping do
    yaml.scalar "foo"
    yaml.sequence do
      yaml.scalar 1
      yaml.scalar 2
    end
    yaml.scalar "bar"
    yaml.mapping do
      yaml.scalar "baz"
      yaml.scalar "qux"
    end
  end
end
string # => "---\nfoo:\n- 1\n- 2\nbar:\n  baz: qux\n"

Defined in:

yaml/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)
inspect 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
to_s(io : IO) 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(io : IO) #

Creates a YAML::Builder that will write to the given IO.


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def self.new(io : IO, &block) #

Creates a YAML::Builder that will write to the given IO, invokes the block and closes the builder.


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Instance Method Detail

def alias(anchor : String) #

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def close #

Closes the builder, freeing up resources.


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def document(&block) #

Starts a document, invokes the block, and then ends it.


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def end_document #

Ends a document.


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def end_mapping #

Ends a mapping.


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def end_sequence #

Ends a sequence.


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def end_stream #

Ends a YAML stream.


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def finalize #

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def flush #

Flushes any pending data to the underlying IO.


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def mapping(anchor : String? = nil, tag : String? = nil, style : YAML::MappingStyle = YAML::MappingStyle::ANY, &block) #

Starts a mapping, invokes the block, and then ends it.


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def max_nesting : Int32 #

By default the maximum nesting of sequences/amppings is 99. Nesting more than this will result in a YAML::Error. Changing the value of this property allows more/less nesting.


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def max_nesting=(max_nesting) #

By default the maximum nesting of sequences/amppings is 99. Nesting more than this will result in a YAML::Error. Changing the value of this property allows more/less nesting.


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

Emits a scalar value.


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

Starts a sequence, invokes the block, and the ends it.


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def start_document #

Starts a document.


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def start_mapping(anchor : String? = nil, tag : String? = nil, style : YAML::MappingStyle = YAML::MappingStyle::ANY) #

Starts a mapping.


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def start_sequence(anchor : String? = nil, tag : String? = nil, style : YAML::SequenceStyle = YAML::SequenceStyle::ANY) #

Starts a sequence.


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def start_stream #

Starts a YAML stream.


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def stream(&block) #

Starts a YAML stream, invokes the block, and ends it.


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