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.. -*- rst -*-
.. groonga-command
.. database: functions_highlight_html
``highlight_html``
==================
.. versionadded:: 4.0.5
Summary
-------
``highlight_html`` tags target text. It can use to highlight the search
keywords. The tagged text are prepared for embedding HTML. Special
characters such as ``<`` and ``>`` are escapsed as ``<`` and ``>``.
Keyword is surrounded with ``<span class="keyword">`` and ``</span>``.
For example, a tagged text of ``I am a groonga user. <3`` for keyword
``groonga`` is ``I am a <span class="keyword">groonga</span> user. <3``.
Syntax
------
This function has from one to two parameters::
highlight_html(text)
highlight_html(text, {"option": "value of option"})
Usage
-----
Here are a schema definition and sample data to show usage.
.. groonga-command
.. include:: ../../example/reference/functions/highlight_html/usage_setup.log
.. table_create Entries TABLE_NO_KEY
.. column_create Entries body COLUMN_SCALAR ShortText
.. table_create Terms TABLE_PAT_KEY ShortText --default_tokenizer TokenBigram --normalizer NormalizerAuto
.. column_create Terms document_index COLUMN_INDEX|WITH_POSITION Entries body
.. load --table Entries
.. [
.. {"body": "Mroonga is a ＭｙＳＱＬ storage engine based on Groonga. <b>Rroonga</b> is a Ruby binding of Groonga."}
.. ]
``highlight_html`` can be used in only ``--output_columns`` in
:doc:`/reference/commands/select` before version 10.0.6 (exclusive).
However, it can be also used in ``--output_columns`` in
:doc:`/reference/commands/logical_select` since version 10.0.6.
``highlight_html`` requires :doc:`/reference/command/command_version` 2
or later.
You also need to specify ``--query`` and/or ``--filter``. Keywords are
extracted from ``--query`` and ``--filter`` arguments.
The following example uses ``--query "groonga mysql"``. In this case,
``groonga`` and ``mysql`` are used as keywords.
.. groonga-command
.. include:: ../../example/reference/functions/highlight_html/usage_basic.log
.. select Entries --output_columns --match_columns body --query 'groonga mysql' --output_columns 'highlight_html(body)' --command_version 2
The text are scanned by the keywords for tagging after they are normalized
by ``NormalizerAuto`` normalizer.
``--query "groonga mysql"`` matches to only the first record's body.
``highlight_html(body)`` surrounds the keywords ``groonga`` or ``mysql``
contained in the text with ``<span class="keyword">`` and ``</span>``.
You can specify string literal instead of column.
.. groonga-command
.. include:: ../../example/reference/functions/highlight_html/usage_string_literal.log
.. select Entries --output_columns 'highlight_html("Groonga is very fast fulltext search engine.")' --command_version 2 --match_columns body --query "groonga"
You can use different style(e.g. background color) for each keywords by ``sequential_class_tag_mode``.
.. groonga-coomand
.. include:: ../../example/reference/functions/highlight_html/usage_sequential_class_tag_mode.log
.. select Entries --match_columns body --query 'groonga OR mroonga' --output_columns 'highlight_html(body, {"sequential_class_tag_mode": true})'
Parameters
----------
This section describes all parameters.
Required parameters
^^^^^^^^^^^^^^^^^^^
There is only one required parameter.
``text``
""""""""
The text to be highlighted in HTML.
Optional parameters
^^^^^^^^^^^^^^^^^^^
``{"sequential_class_tag_mode": true}``
"""""""""""""""""""""""""""""""""""""""
.. versionadded:: 13.0.2
The default value of ``sequential_class_tag_mode`` is ``false``.
If ``sequential_class_tag_mode`` is ``true``, you can use different style(e.g. background color) for each keywords.
If ``sequential_class_tag_mode`` is ``true``, class tags are ``<mark class="keyword-%d">/<mark>`` for now.
Return value
------------
``highlight_html`` returns a tagged string or ``null``. If
``highlight_html`` can't find any keywords, it returns ``null``.
See also
--------
* :doc:`/reference/commands/select`
* :doc:`/reference/commands/logical_select`
* :doc:`/reference/functions/highlight_full`
|
