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[Yaml] feature #59315 Add compact nested mapping support to Dumper #20510

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Jan 22, 2025
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[Yaml] feature #59315 Add compact nested mapping support to Dumper #20510

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28 changes: 28 additions & 0 deletions components/yaml.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -440,6 +440,34 @@ By default, digit-only array keys are dumped as integers. You can use the
$dumped = Yaml::dump([200 => 'foo'], 2, 4, Yaml::DUMP_NUMERIC_KEY_AS_STRING);
// '200': foo

Dumping Collection of Maps
~~~~~~~~~~~~~~~~~~~~~~~~~~

By default, the collection of maps uses a hyphen on a separate line as a delimiter.
To use the delimiter line as part of the map dump, use the ``Yaml::DUMP_COMPACT_NESTED_MAPPING`` flag.

Dump without flag set:

.. code-block:: yaml

planets:
-
name: Mercury
distance: 57910000
-
name: Jupiter
distance: 778500000

Dump with ``Yaml::DUMP_COMPACT_NESTED_MAPPING`` flag set:

.. code-block:: yaml

planets:
- name: Mercury
distance: 57910000
- name: Jupiter
distance: 778500000

Syntax Validation
~~~~~~~~~~~~~~~~~

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