276 lines
11 KiB
Python
276 lines
11 KiB
Python
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# See readme.md for instructions on running this code.
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from __future__ import division
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from past.utils import old_div
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import copy
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from math import log10, floor
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# A dictionary allowing the conversion of each unit to its base unit.
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# An entry consists of the unit's name, a constant number and a constant
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# factor that need to be added and multiplied to convert the unit into
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# the base unit in the last parameter.
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UNITS = {'bit': [0, 1, 'bit'],
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'byte': [0, 8, 'bit'],
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'cubic-centimeter': [0, 0.000001, 'cubic-meter'],
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'cubic-decimeter': [0, 0.001, 'cubic-meter'],
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'liter': [0, 0.001, 'cubic-meter'],
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'cubic-meter': [0, 1, 'cubic-meter'],
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'cubic-inch': [0, 0.000016387064, 'cubic-meter'],
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'fluid-ounce': [0, 0.000029574, 'cubic-meter'],
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'cubic-foot': [0, 0.028316846592, 'cubic-meter'],
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'cubic-yard': [0, 0.764554857984, 'cubic-meter'],
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'teaspoon': [0, 0.0000049289216, 'cubic-meter'],
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'tablespoon': [0, 0.000014787, 'cubic-meter'],
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'cup': [0, 0.00023658823648491, 'cubic-meter'],
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'gram': [0, 1, 'gram'],
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'kilogram': [0, 1000, 'gram'],
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'ton': [0, 1000000, 'gram'],
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'ounce': [0, 28.349523125, 'gram'],
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'pound': [0, 453.59237, 'gram'],
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'kelvin': [0, 1, 'kelvin'],
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'celsius': [273.15, 1, 'kelvin'],
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'fahrenheit': [255.372222, 0.555555, 'kelvin'],
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'centimeter': [0, 0.01, 'meter'],
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'decimeter': [0, 0.1, 'meter'],
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'meter': [0, 1, 'meter'],
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'kilometer': [0, 1000, 'meter'],
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'inch': [0, 0.0254, 'meter'],
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'foot': [0, 0.3048, 'meter'],
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'yard': [0, 0.9144, 'meter'],
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'mile': [0, 1609.344, 'meter'],
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'nautical-mile': [0, 1852, 'meter'],
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'square-centimeter': [0, 0.0001, 'square-meter'],
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'square-decimeter': [0, 0.01, 'square-meter'],
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'square-meter': [0, 1, 'square-meter'],
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'square-kilometer': [0, 1000000, 'square-meter'],
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'square-inch': [0, 0.00064516, 'square-meter'],
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'square-foot': [0, 0.09290304, 'square-meter'],
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'square-yard': [0, 0.83612736, 'square-meter'],
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'square-mile': [0, 2589988.110336, 'square-meter'],
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'are': [0, 100, 'square-meter'],
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'hectare': [0, 10000, 'square-meter'],
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'acre': [0, 4046.8564224, 'square-meter']}
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PREFIXES = {'atto': -18,
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'femto': -15,
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'pico': -12,
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'nano': -9,
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'micro': -6,
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'milli': -3,
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'centi': -2,
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'deci': -1,
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'deca': 1,
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'hecto': 2,
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'kilo': 3,
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'mega': 6,
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'giga': 9,
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'tera': 12,
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'peta': 15,
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'exa': 18}
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ALIASES = {'a': 'are',
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'ac': 'acre',
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'c': 'celsius',
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'cm': 'centimeter',
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'cm2': 'square-centimeter',
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'cm3': 'cubic-centimeter',
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'cm^2': 'square-centimeter',
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'cm^3': 'cubic-centimeter',
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'dm': 'decimeter',
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'dm2': 'square-decimeter',
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'dm3': 'cubic-decimeter',
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'dm^2': 'square-decimeter',
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'dm^3': 'cubic-decimeter',
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'f': 'fahrenheit',
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'fl-oz': 'fluid-ounce',
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'ft': 'foot',
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'ft2': 'square-foot',
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'ft3': 'cubic-foot',
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'ft^2': 'square-foot',
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'ft^3': 'cubic-foot',
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'g': 'gram',
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'ha': 'hectare',
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'in': 'inch',
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'in2': 'square-inch',
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'in3': 'cubic-inch',
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'in^2': 'square-inch',
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'in^3': 'cubic-inch',
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'k': 'kelvin',
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'kg': 'kilogram',
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'km': 'kilometer',
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'km2': 'square-kilometer',
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'km^2': 'square-kilometer',
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'l': 'liter',
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'lb': 'pound',
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'm': 'meter',
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'm2': 'square-meter',
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'm3': 'cubic-meter',
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'm^2': 'square-meter',
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'm^3': 'cubic-meter',
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'mi': 'mile',
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'mi2': 'square-mile',
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'mi^2': 'square-mile',
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'nmi': 'nautical-mile',
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'oz': 'ounce',
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't': 'ton',
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'tbsp': 'tablespoon',
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'tsp': 'teaspoon',
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'y': 'yard',
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'y2': 'square-yard',
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'y3': 'cubic-yard',
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'y^2': 'square-yard',
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'y^3': 'cubic-yard'}
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HELP_MESSAGE = ('Converter usage:\n'
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'`@convert <number> <unit_from> <unit_to>`\n'
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'Converts `number` in the unit <unit_from> to '
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'the <unit_to> and prints the result\n'
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'`number`: integer or floating point number, e.g. 12, 13.05, 0.002\n'
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'<unit_from> and <unit_to> are two of the following units:\n'
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'* square-centimeter (cm^2, cm2), square-decimeter (dm^2, dm2), '
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'square-meter (m^2, m2), square-kilometer (km^2, km2),'
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' square-inch (in^2, in2), square-foot (ft^2, ft2), square-yard (y^2, y2), '
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' square-mile(mi^2, mi2), are (a), hectare (ha), acre (ac)\n'
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'* bit, byte\n'
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'* centimeter (cm), decimeter(dm), meter (m),'
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' kilometer (km), inch (in), foot (ft), yard (y),'
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' mile (mi), nautical-mile (nmi)\n'
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'* Kelvin (K), Celsius(C), Fahrenheit (F)\n'
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'* cubic-centimeter (cm^3, cm3), cubic-decimeter (dm^3, dm3), liter (l), '
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'cubic-meter (m^3, m3), cubic-inch (in^3, in3), fluid-ounce (fl-oz), '
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'cubic-foot (ft^3, ft3), cubic-yard (y^3, y3)\n'
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'* gram (g), kilogram (kg), ton (t), ounce (oz), pound(lb)\n'
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'* (metric only, U.S. and imperial units differ slightly:) teaspoon (tsp), tablespoon (tbsp), cup\n\n\n'
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'Allowed prefixes are:\n'
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'* atto, pico, femto, nano, micro, milli, centi, deci\n'
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'* deca, hecto, kilo, mega, giga, tera, peta, exa\n\n\n'
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'Usage examples:\n'
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'* `@convert 12 celsius fahrenheit`\n'
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'* `@convert 0.002 kilomile millimeter`\n'
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'* `@convert 31.5 square-mile ha`\n'
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'* `@convert 56 g lb`\n')
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QUICK_HELP = 'Enter `@convert help` for help on using the converter.'
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def is_float(value):
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try:
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float(value)
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return True
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except ValueError:
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return False
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# Rounds the number 'x' to 'digits' significant digits.
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# A normal 'round()' would round the number to an absolute amount of
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# fractional decimals, e.g. 0.00045 would become 0.0.
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# 'round_to()' rounds only the digits that are not 0.
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# 0.00045 would then become 0.0005.
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def round_to(x, digits):
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return round(x, digits-int(floor(log10(abs(x)))))
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class ConverterHandler(object):
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'''
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This plugin allows users to make conversions between various units,
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e.g. Celsius to Fahrenheit, or kilobytes to gigabytes.
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It looks for messages of the format
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'@convert <number> <unit_from> <unit_to>'
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The message '@convert help' posts a short description of how to use
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the plugin, along with a list of all supported units.
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'''
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def usage(self):
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return '''
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This plugin allows users to make conversions between
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various units, e.g. Celsius to Fahrenheit,
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or kilobytes to gigabytes. It looks for messages of
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the format '@convert <number> <unit_from> <unit_to>'
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The message '@convert help' posts a short description of
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how to use the plugin, along with a list of
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all supported units.
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'''
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def triage_message(self, message, client):
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return '@convert' in message['content']
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def handle_message(self, message, client, state_handler):
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content = message['content']
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words = content.lower().split()
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convert_indexes = [i for i, word in enumerate(words) if word == "@convert"]
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results = []
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for convert_index in convert_indexes:
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if (convert_index + 1) < len(words) and words[convert_index + 1] == 'help':
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results.append(HELP_MESSAGE)
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continue
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if (convert_index + 3) < len(words):
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number = words[convert_index + 1]
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unit_from = ALIASES.get(words[convert_index + 2], words[convert_index + 2])
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unit_to = ALIASES.get(words[convert_index + 3], words[convert_index + 3])
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exponent = 0
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if not is_float(number):
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results.append(number + ' is not a valid number. ' + QUICK_HELP)
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continue
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number = float(number)
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number_res = copy.copy(number)
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for key, exp in PREFIXES.items():
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if unit_from.startswith(key):
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exponent += exp
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unit_from = unit_from[len(key):]
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if unit_to.startswith(key):
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exponent -= exp
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unit_to = unit_to[len(key):]
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uf_to_std = UNITS.get(unit_from, False)
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ut_to_std = UNITS.get(unit_to, False)
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if uf_to_std is False:
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results.append(unit_from + ' is not a valid unit. ' + QUICK_HELP)
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if ut_to_std is False:
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results.append(unit_to + ' is not a valid unit.' + QUICK_HELP)
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if uf_to_std is False or ut_to_std is False:
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continue
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base_unit = uf_to_std[2]
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if uf_to_std[2] != ut_to_std[2]:
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unit_from = unit_from.capitalize() if uf_to_std[2] == 'kelvin' else unit_from
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results.append(unit_to.capitalize() + ' and ' + unit_from +
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' are not from the same category. ' + QUICK_HELP)
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continue
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# perform the conversion between the units
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number_res *= uf_to_std[1]
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number_res += uf_to_std[0]
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number_res -= ut_to_std[0]
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number_res /= ut_to_std[1]
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if base_unit == 'bit':
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number_res *= 1024 ** (old_div(exponent, float(3)))
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else:
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number_res *= 10 ** exponent
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number_res = round_to(number_res, 7)
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results.append('{} {} = {} {}'.format(number,
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words[convert_index + 2],
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number_res,
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words[convert_index + 3]))
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else:
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results.append('Too few arguments given. ' + QUICK_HELP)
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new_content = ''
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for idx, result in enumerate(results, 1):
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new_content += ((str(idx) + '. conversion: ') if len(results) > 1 else '') + result + '\n'
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client.send_message(dict(
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type='stream',
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to=message['display_recipient'],
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subject=message['subject'],
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content=new_content,
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))
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handler_class = ConverterHandler
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