422 lines
11 KiB
Ruby
422 lines
11 KiB
Ruby
require "addressable/uri"
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require "json"
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require "date"
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require "liquid"
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require_all "jekyll/filters"
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module Jekyll
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module Filters
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include URLFilters
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include GroupingFilters
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# Convert a Markdown string into HTML output.
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#
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# input - The Markdown String to convert.
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#
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# Returns the HTML formatted String.
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def markdownify(input)
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site = @context.registers[:site]
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converter = site.find_converter_instance(Jekyll::Converters::Markdown)
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converter.convert(input.to_s)
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end
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# Convert quotes into smart quotes.
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#
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# input - The String to convert.
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#
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# Returns the smart-quotified String.
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def smartify(input)
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site = @context.registers[:site]
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converter = site.find_converter_instance(Jekyll::Converters::SmartyPants)
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converter.convert(input.to_s)
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end
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# Convert a Sass string into CSS output.
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#
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# input - The Sass String to convert.
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#
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# Returns the CSS formatted String.
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def sassify(input)
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site = @context.registers[:site]
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converter = site.find_converter_instance(Jekyll::Converters::Sass)
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converter.convert(input)
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end
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# Convert a Scss string into CSS output.
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#
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# input - The Scss String to convert.
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#
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# Returns the CSS formatted String.
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def scssify(input)
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site = @context.registers[:site]
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converter = site.find_converter_instance(Jekyll::Converters::Scss)
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converter.convert(input)
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end
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# Slugify a filename or title.
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#
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# input - The filename or title to slugify.
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# mode - how string is slugified
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#
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# Returns the given filename or title as a lowercase URL String.
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# See Utils.slugify for more detail.
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def slugify(input, mode = nil)
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Utils.slugify(input, :mode => mode)
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end
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# Format a date in short format e.g. "27 Jan 2011".
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#
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# date - the Time to format.
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#
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# Returns the formatting String.
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def date_to_string(date)
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time(date).strftime("%d %b %Y")
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end
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# Format a date in long format e.g. "27 January 2011".
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#
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# date - The Time to format.
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#
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# Returns the formatted String.
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def date_to_long_string(date)
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return date if date.to_s.empty?
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time(date).strftime("%d %B %Y")
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end
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# Format a date for use in XML.
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#
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# date - The Time to format.
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#
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# Examples
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#
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# date_to_xmlschema(Time.now)
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# # => "2011-04-24T20:34:46+08:00"
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#
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# Returns the formatted String.
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def date_to_xmlschema(date)
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return date if date.to_s.empty?
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time(date).xmlschema
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end
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# Format a date according to RFC-822
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#
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# date - The Time to format.
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#
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# Examples
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#
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# date_to_rfc822(Time.now)
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# # => "Sun, 24 Apr 2011 12:34:46 +0000"
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#
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# Returns the formatted String.
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def date_to_rfc822(date)
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return date if date.to_s.empty?
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time(date).rfc822
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end
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# XML escape a string for use. Replaces any special characters with
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# appropriate HTML entity replacements.
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#
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# input - The String to escape.
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#
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# Examples
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#
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# xml_escape('foo "bar" <baz>')
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# # => "foo "bar" <baz>"
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#
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# Returns the escaped String.
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def xml_escape(input)
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input.to_s.encode(:xml => :attr).gsub(%r!\A"|"\Z!, "")
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end
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# CGI escape a string for use in a URL. Replaces any special characters
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# with appropriate %XX replacements.
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#
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# input - The String to escape.
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#
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# Examples
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#
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# cgi_escape('foo,bar;baz?')
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# # => "foo%2Cbar%3Bbaz%3F"
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#
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# Returns the escaped String.
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def cgi_escape(input)
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CGI.escape(input)
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end
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# URI escape a string.
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#
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# input - The String to escape.
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#
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# Examples
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#
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# uri_escape('foo, bar \\baz?')
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# # => "foo,%20bar%20%5Cbaz?"
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#
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# Returns the escaped String.
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def uri_escape(input)
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Addressable::URI.normalize_component(input)
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end
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# Replace any whitespace in the input string with a single space
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#
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# input - The String on which to operate.
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#
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# Returns the formatted String
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def normalize_whitespace(input)
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input.to_s.gsub(%r!\s+!, " ").strip
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end
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# Count the number of words in the input string.
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#
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# input - The String on which to operate.
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#
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# Returns the Integer word count.
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def number_of_words(input)
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input.split.length
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end
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# Join an array of things into a string by separating with commas and the
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# word "and" for the last one.
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#
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# array - The Array of Strings to join.
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# connector - Word used to connect the last 2 items in the array
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#
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# Examples
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#
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# array_to_sentence_string(["apples", "oranges", "grapes"])
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# # => "apples, oranges, and grapes"
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#
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# Returns the formatted String.
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def array_to_sentence_string(array, connector = "and")
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case array.length
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when 0
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""
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when 1
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array[0].to_s
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when 2
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"#{array[0]} #{connector} #{array[1]}"
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else
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"#{array[0...-1].join(", ")}, #{connector} #{array[-1]}"
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end
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end
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# Convert the input into json string
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#
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# input - The Array or Hash to be converted
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#
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# Returns the converted json string
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def jsonify(input)
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as_liquid(input).to_json
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end
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# Filter an array of objects
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#
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# input - the object array
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# property - property within each object to filter by
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# value - desired value
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#
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# Returns the filtered array of objects
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def where(input, property, value)
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return input unless input.respond_to?(:select)
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input = input.values if input.is_a?(Hash)
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input.select do |object|
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Array(item_property(object, property)).map(&:to_s).include?(value.to_s)
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end || []
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end
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# Filters an array of objects against an expression
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#
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# input - the object array
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# variable - the variable to assign each item to in the expression
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# expression - a Liquid comparison expression passed in as a string
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#
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# Returns the filtered array of objects
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def where_exp(input, variable, expression)
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return input unless input.respond_to?(:select)
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input = input.values if input.is_a?(Hash) # FIXME
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condition = parse_condition(expression)
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@context.stack do
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input.select do |object|
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@context[variable] = object
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condition.evaluate(@context)
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end
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end || []
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end
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# Convert the input into integer
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#
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# input - the object string
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#
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# Returns the integer value
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def to_integer(input)
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return 1 if input == true
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return 0 if input == false
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input.to_i
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end
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# Sort an array of objects
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#
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# input - the object array
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# property - property within each object to filter by
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# nils ('first' | 'last') - nils appear before or after non-nil values
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#
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# Returns the filtered array of objects
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def sort(input, property = nil, nils = "first")
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if input.nil?
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raise ArgumentError, "Cannot sort a null object."
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end
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if property.nil?
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input.sort
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else
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if nils == "first"
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order = - 1
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elsif nils == "last"
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order = + 1
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else
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raise ArgumentError, "Invalid nils order: " \
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"'#{nils}' is not a valid nils order. It must be 'first' or 'last'."
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end
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sort_input(input, property, order)
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end
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end
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def pop(array, num = 1)
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return array unless array.is_a?(Array)
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num = Liquid::Utils.to_integer(num)
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new_ary = array.dup
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new_ary.pop(num)
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new_ary
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end
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def push(array, input)
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return array unless array.is_a?(Array)
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new_ary = array.dup
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new_ary.push(input)
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new_ary
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end
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def shift(array, num = 1)
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return array unless array.is_a?(Array)
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num = Liquid::Utils.to_integer(num)
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new_ary = array.dup
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new_ary.shift(num)
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new_ary
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end
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def unshift(array, input)
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return array unless array.is_a?(Array)
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new_ary = array.dup
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new_ary.unshift(input)
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new_ary
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end
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def sample(input, num = 1)
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return input unless input.respond_to?(:sample)
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num = Liquid::Utils.to_integer(num) rescue 1
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if num == 1
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input.sample
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else
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input.sample(num)
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end
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end
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# Convert an object into its String representation for debugging
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#
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# input - The Object to be converted
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#
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# Returns a String representation of the object.
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def inspect(input)
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xml_escape(input.inspect)
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end
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private
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def sort_input(input, property, order)
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input.sort do |apple, orange|
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apple_property = item_property(apple, property)
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orange_property = item_property(orange, property)
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if !apple_property.nil? && orange_property.nil?
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- order
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elsif apple_property.nil? && !orange_property.nil?
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+ order
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else
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apple_property <=> orange_property
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end
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end
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end
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private
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def time(input)
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date = Liquid::Utils.to_date(input)
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unless date.respond_to?(:to_time)
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raise Errors::InvalidDateError,
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"Invalid Date: '#{input.inspect}' is not a valid datetime."
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end
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date.to_time.dup.localtime
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end
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private
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def item_property(item, property)
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if item.respond_to?(:to_liquid)
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property.to_s.split(".").reduce(item.to_liquid) do |subvalue, attribute|
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subvalue[attribute]
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end
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elsif item.respond_to?(:data)
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item.data[property.to_s]
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else
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item[property.to_s]
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end
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end
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private
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def as_liquid(item)
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case item
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when Hash
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pairs = item.map { |k, v| as_liquid([k, v]) }
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Hash[pairs]
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when Array
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item.map { |i| as_liquid(i) }
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else
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if item.respond_to?(:to_liquid)
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liquidated = item.to_liquid
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# prevent infinite recursion for simple types (which return `self`)
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if liquidated == item
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item
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else
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as_liquid(liquidated)
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end
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else
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item
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end
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end
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end
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# Parse a string to a Liquid Condition
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private
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def parse_condition(exp)
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parser = Liquid::Parser.new(exp)
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left_expr = parser.expression
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operator = parser.consume?(:comparison)
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condition =
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if operator
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Liquid::Condition.new(Liquid::Expression.parse(left_expr),
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operator,
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Liquid::Expression.parse(parser.expression))
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else
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Liquid::Condition.new(Liquid::Expression.parse(left_expr))
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end
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parser.consume(:end_of_string)
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condition
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end
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end
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end
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Liquid::Template.register_filter(
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Jekyll::Filters
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)
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