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return
the original value reformatted as a YAML string.
rtype
string
Convert a YAML string to a Lua object.
a string formatted as YAML.
the original contents formatted as a Lua table.
table
**__serialize parameter:**
The YAML output structure can be specified with ``__serialize``:
``'seq'``, ``'sequence'``, ``'array'``: table encoded as an array
``'map'``, ``'mapping'``: table encoded as a map
``function``: the meta-method called to unpack serializable representation of table, cdata, or userdata objects
``'seq'`` or ``'map'`` also enable the flow (compact) mode for the YAML serializer (``flow="[1,2,3]"`` vs ``block=" - 1\n - 2\n - 3\n"``).
Serializing ``'A'`` and ``'B'`` with different ``__serialize`` values brings different results:
tarantool> yaml.encode(setmetatable({'A', 'B'}, { __serialize="seq"}))
---
- '["A","B"]'
...
tarantool> yaml.encode(setmetatable({'A', 'B'}, { __serialize="map"}))
---
- '{"1":"A","2":"B"}'
...
tarantool> yaml.encode({setmetatable({f1 = 'A', f2 = 'B'}, { __serialize="map"})})
---
- '[{"f2":"B","f1":"A"}]'
...
tarantool> yaml.encode({setmetatable({f1 = 'A', f2 = 'B'}, { __serialize="seq"})})
---
- '[[]]'
...
Set values affecting the behavior of encode and decode functions.
The values are all either integers or boolean ``true``/``false``.
Option
Default
``cfg.encode_invalid_numbers``
true
A flag saying whether to enable encoding of NaN and Inf numbers
``cfg.encode_number_precision``
14
Precision of floating point numbers
``cfg.encode_load_metatables``
A flag saying whether the serializer will follow :ref:`__serialize <json-serialize>` metatable field
``cfg.encode_use_tostring``
false
A flag saying whether to use ``tostring()`` for unknown types

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testing_project / Documentation: reference/reference_lua/yaml — English

tarantool> yaml.encode(setmetatable({'A', 'B'}, { __serialize="seq"}))
---
- '["A","B"]'
...
tarantool> yaml.encode(setmetatable({'A', 'B'}, { __serialize="map"}))
---
- '{"1":"A","2":"B"}'
...
tarantool> yaml.encode({setmetatable({f1 = 'A', f2 = 'B'}, { __serialize="map"})})
---
- '[{"f2":"B","f1":"A"}]'
...
tarantool> yaml.encode({setmetatable({f1 = 'A', f2 = 'B'}, { __serialize="seq"})})
---
- '[[]]'
...
a year ago
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