44 lines
1.2 KiB
Ruby
44 lines
1.2 KiB
Ruby
require "liquid"
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require "jekyll"
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module Jekyll
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module FractionaliseFilter
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def fractionalise(input, limit = 0)
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input = input.to_s
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if not input.include? "."
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# if input is a whole number, just return it
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return input
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end
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if input.split(".").length != 2
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# generally when liquid filters fail they just print nothing, so we'll do that too
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return ""
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end
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leading_integer, decimal = input.split(".")
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decimal = "0.#{decimal}"
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rational = case decimal
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# handle common weird cases so that e.g. 0.3 returns "1/3" and not "3/10" or "5404319552844595/18014398509481984"
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when "0.3", "0.33", "0.333"
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Rational(1, 3)
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when "0.6", "0.67", "0.666"
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Rational(2, 3)
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else
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decimal.to_r
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end
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if limit != 0 and rational.denominator > limit
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# apply a maximum size for the denominator to avoid the (imo) much more readable "0.41" becoming "41/100" unless wanted
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return input
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end
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"<span title='#{input}'>#{leading_integer != "0" ? "#{leading_integer} " : ""}<span class='fraction'><span class='numerator'>#{rational.numerator}</span><span class='denominator'>#{rational.denominator}</span></span></span>"
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end
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end
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end
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Liquid::Template.register_filter(Jekyll::FractionaliseFilter)
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