searx.plugins.unit_converter Namespace Reference

Classes
class	SXNGPlugin

Functions
	symbol_to_si ()
str|None	_parse_text_and_convert (from_query, to_query)

Variables
str	name = ""
	description = gettext("")
str	plugin_id = ""
str	preference_section = ""
list	CONVERT_KEYWORDS = ["in", "to", "as"]
str	RE_MEASURE
list	ADDITIONAL_UNITS
dict	ALIAS_SYMBOLS
list	SYMBOL_TO_SI = []

Detailed Description

A plugin for converting measured values from one unit to another unit (a
unit converter).

The plugin looks up the symbols (given in the query term) in a list of
converters, each converter is one item in the list (compare
:py:obj:`ADDITIONAL_UNITS`).  If the symbols are ambiguous, the matching units
of measurement are evaluated.  The weighting in the evaluation results from the
sorting of the :py:obj:`list of unit converters<symbol_to_si>`.

Function Documentation

_parse_text_and_convert()

str | None searx.plugins.unit_converter._parse_text_and_convert ( from_query, to_query )

protected

Definition at line 215 of file unit_converter.py.

def _parse_text_and_convert(from_query, to_query) -> str | None:
 
    # pylint: disable=too-many-branches, too-many-locals
 
    if not (from_query and to_query):
        return None
 
    measured = re.match(RE_MEASURE, from_query, re.VERBOSE)
    if not (measured and measured.group('number'), measured.group('unit')):
        return None
 
    # Symbols are not unique, if there are several hits for the from-unit, then
    # the correct one must be determined by comparing it with the to-unit
    # https://github.com/searxng/searxng/pull/3378#issuecomment-2080974863
 
    # first: collecting possible units
 
    source_list, target_list = [], []
 
    for symbol, si_name, from_si, to_si, orig_symbol in symbol_to_si():
 
        if symbol == measured.group('unit'):
            source_list.append((si_name, to_si))
        if symbol == to_query:
            target_list.append((si_name, from_si, orig_symbol))
 
    if not (source_list and target_list):
        return None
 
    source_to_si = target_from_si = target_symbol = None
 
    # second: find the right unit by comparing list of from-units with list of to-units
 
    for source in source_list:
        for target in target_list:
            if source[0] == target[0]:  # compare si_name
                source_to_si = source[1]
                target_from_si = target[1]
                target_symbol = target[2]
 
    if not (source_to_si and target_from_si):
        return None
 
    _locale = get_locale() or 'en_US'
 
    value = measured.group('sign') + measured.group('number') + (measured.group('E') or '')
    value = babel.numbers.parse_decimal(value, locale=_locale)
 
    # convert value to SI unit
 
    if isinstance(source_to_si, (float, int)):
        value = float(value) * source_to_si
    else:
        value = source_to_si(float(value))
 
    # convert value from SI unit to target unit
 
    if isinstance(target_from_si, (float, int)):
        value = float(value) * target_from_si
    else:
        value = target_from_si(float(value))
 
    if measured.group('E'):
        # when incoming notation is scientific, outgoing notation is scientific
        result = babel.numbers.format_scientific(value, locale=_locale)
    else:
        result = babel.numbers.format_decimal(value, locale=_locale, format='#,##0.##########;-#')
 
    return f'{result} {target_symbol}'

References symbol_to_si().

Referenced by searx.plugins.unit_converter.SXNGPlugin.post_search().

Here is the call graph for this function:

Here is the caller graph for this function:

symbol_to_si()

searx.plugins.unit_converter.symbol_to_si

(

)

Generates a list of tuples, each tuple is a measure unit and the fields
in the tuple are:

0. Symbol of the measure unit (e.g. 'mi' for measure unit 'miles' Q253276)

1. SI name of the measure unit (e.g. Q11573 for SI unit 'metre')

2. Factor to get SI value from measure unit (e.g. 1mi is equal to SI 1m
   multiplied by 1609.344)

3. Factor to get measure value from from SI value (e.g. SI 100m is equal to
   100mi divided by 1609.344)

The returned list is sorted, the first items are created from
``WIKIDATA_UNITS``, the second group of items is build from
:py:obj:`ADDITIONAL_UNITS` and items created from :py:obj:`ALIAS_SYMBOLS`.

If you search this list for a symbol, then a match with a symbol from
Wikidata has the highest weighting (first hit in the list), followed by the
symbols from the :py:obj:`ADDITIONAL_UNITS` and the lowest weighting is
given to the symbols resulting from the aliases :py:obj:`ALIAS_SYMBOLS`.

Definition at line 143 of file unit_converter.py.

def symbol_to_si():
    """Generates a list of tuples, each tuple is a measure unit and the fields
    in the tuple are:
 
    0. Symbol of the measure unit (e.g. 'mi' for measure unit 'miles' Q253276)
 
    1. SI name of the measure unit (e.g. Q11573 for SI unit 'metre')
 
    2. Factor to get SI value from measure unit (e.g. 1mi is equal to SI 1m
       multiplied by 1609.344)
 
    3. Factor to get measure value from from SI value (e.g. SI 100m is equal to
       100mi divided by 1609.344)
 
    The returned list is sorted, the first items are created from
    ``WIKIDATA_UNITS``, the second group of items is build from
    :py:obj:`ADDITIONAL_UNITS` and items created from :py:obj:`ALIAS_SYMBOLS`.
 
    If you search this list for a symbol, then a match with a symbol from
    Wikidata has the highest weighting (first hit in the list), followed by the
    symbols from the :py:obj:`ADDITIONAL_UNITS` and the lowest weighting is
    given to the symbols resulting from the aliases :py:obj:`ALIAS_SYMBOLS`.
 
    """
 
    global SYMBOL_TO_SI  # pylint: disable=global-statement
    if SYMBOL_TO_SI:
        return SYMBOL_TO_SI
 
    # filter out units which can't be normalized to a SI unit and filter out
    # units without a symbol / arcsecond does not have a symbol
    # https://www.wikidata.org/wiki/Q829073
 
    for item in data.WIKIDATA_UNITS.values():
        if item['to_si_factor'] and item['symbol']:
            SYMBOL_TO_SI.append(
                (
                    item['symbol'],
                    item['si_name'],
                    1 / item['to_si_factor'],  # from_si
                    item['to_si_factor'],  # to_si
                    item['symbol'],
                )
            )
 
    for item in ADDITIONAL_UNITS:
        SYMBOL_TO_SI.append(
            (
                item['symbol'],
                item['si_name'],
                item['from_si'],
                item['to_si'],
                item['symbol'],
            )
        )
 
    alias_items = []
    for item in SYMBOL_TO_SI:
        for alias in ALIAS_SYMBOLS.get(item[0], ()):
            alias_items.append(
                (
                    alias,
                    item[1],
                    item[2],  # from_si
                    item[3],  # to_si
                    item[0],  # origin unit
                )
            )
    SYMBOL_TO_SI = SYMBOL_TO_SI + alias_items
    return SYMBOL_TO_SI
 
 

Referenced by _parse_text_and_convert().

Here is the caller graph for this function:

Variable Documentation

ADDITIONAL_UNITS

list searx.plugins.unit_converter.ADDITIONAL_UNITS

Initial value:

=  [
    {
        "si_name": "Q11579",
        "symbol": "°C",
        "to_si": lambda val: val + 273.15,
        "from_si": lambda val: val - 273.15,
    },
    {
        "si_name": "Q11579",
        "symbol": "°F",
        "to_si": lambda val: (val + 459.67) * 5 / 9,
        "from_si": lambda val: (val * 9 / 5) - 459.67,
    },
]

Definition at line 89 of file unit_converter.py.

ALIAS_SYMBOLS

dict searx.plugins.unit_converter.ALIAS_SYMBOLS

Initial value:

=  {
    '°C': ('C',),
    '°F': ('F',),
    'mi': ('L',),
}

Definition at line 127 of file unit_converter.py.

CONVERT_KEYWORDS

list searx.plugins.unit_converter.CONVERT_KEYWORDS = ["in", "to", "as"]

Definition at line 34 of file unit_converter.py.

description

searx.plugins.unit_converter.description = gettext("")

Definition at line 29 of file unit_converter.py.

name

str searx.plugins.unit_converter.name = ""

Definition at line 28 of file unit_converter.py.

plugin_id

str searx.plugins.unit_converter.plugin_id = ""

Definition at line 31 of file unit_converter.py.

preference_section

str searx.plugins.unit_converter.preference_section = ""

Definition at line 32 of file unit_converter.py.

RE_MEASURE

str searx.plugins.unit_converter.RE_MEASURE

Initial value:

=  r'''
(?P<sign>[-+]?)         # +/- or nothing for positive
(\s*)                   # separator: white space or nothing
(?P<number>[\d\.,]*)    # number: 1,000.00 (en) or 1.000,00 (de)
(?P<E>[eE][-+]?\d+)?    # scientific notation: e(+/-)2 (*10^2)
(\s*)                   # separator: white space or nothing
(?P<unit>\S+)           # unit of measure
'''

Definition at line 79 of file unit_converter.py.

SYMBOL_TO_SI

list searx.plugins.unit_converter.SYMBOL_TO_SI = []

Definition at line 140 of file unit_converter.py.