Module: Liquid::StandardFilters

Defined in:
lib/liquid/standardfilters.rb

Defined Under Namespace

Classes: InputIterator

Constant Summary collapse

HTML_ESCAPE = 
{
  '&'.freeze => '&'.freeze,
  '>'.freeze => '>'.freeze,
  '<'.freeze => '&lt;'.freeze,
  '"'.freeze => '&quot;'.freeze,
  "'".freeze => '&#39;'.freeze
}.freeze
HTML_ESCAPE_ONCE_REGEXP = 
/["><']|&(?!([a-zA-Z]+|(#\d+));)/
STRIP_HTML_BLOCKS = 
Regexp.union(
  /<script.*?<\/script>/m,
  /<!--.*?-->/m,
  /<style.*?<\/style>/m
)
STRIP_HTML_TAGS = 
/<.*?>/m

Instance Method Summary collapse

Instance Method Details

#abs(input) ⇒ Object

absolute value



352
353
354
355
 
# File 'lib/liquid/standardfilters.rb', line 352

def abs(input)
  result = Utils.to_number(input).abs
  result.is_a?(BigDecimal) ? result.to_f : result
end

#append(input, string) ⇒ Object

add one string to another



273
274
275
 
# File 'lib/liquid/standardfilters.rb', line 273

def append(input, string)
  input.to_s + string.to_s
end

#at_least(input, n) ⇒ Object 



406
407
408
409
410
411
412
 
# File 'lib/liquid/standardfilters.rb', line 406

def at_least(input, n)
  min_value = Utils.to_number(n)

  result = Utils.to_number(input)
  result = min_value if min_value > result
  result.is_a?(BigDecimal) ? result.to_f : result
end

#at_most(input, n) ⇒ Object 



414
415
416
417
418
419
420
 
# File 'lib/liquid/standardfilters.rb', line 414

def at_most(input, n)
  max_value = Utils.to_number(n)

  result = Utils.to_number(input)
  result = max_value if max_value < result
  result.is_a?(BigDecimal) ? result.to_f : result
end

#capitalize(input) ⇒ Object

capitalize words in the input centence



37
38
39
 
# File 'lib/liquid/standardfilters.rb', line 37

def capitalize(input)
  input.to_s.capitalize
end

#ceil(input) ⇒ Object 



394
395
396
397
398
 
# File 'lib/liquid/standardfilters.rb', line 394

def ceil(input)
  Utils.to_number(input).ceil.to_i
rescue ::FloatDomainError => e
  raise Liquid::FloatDomainError, e.message
end

#compact(input, property = nil) ⇒ Object

Remove nils within an array provide optional property with which to check for nil



236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
 
# File 'lib/liquid/standardfilters.rb', line 236

def compact(input, property = nil)
  ary = InputIterator.new(input)

  if property.nil?
    ary.compact
  elsif ary.empty? # The next two cases assume a non-empty array.
    []
  elsif ary.first.respond_to?(:[])
    begin
      ary.reject { |a| a[property].nil? }
    rescue TypeError
      raise_property_error(property)
    end
  end
end

#concat(input, array) ⇒ Object 



277
278
279
280
281
282
 
# File 'lib/liquid/standardfilters.rb', line 277

def concat(input, array)
  unless array.respond_to?(:to_ary)
    raise ArgumentError.new("concat filter requires an array argument")
  end
  InputIterator.new(input).concat(array)
end

#date(input, format) ⇒ Object

Reformat a date using Ruby’s core Time#strftime( string ) -> string

%a - The abbreviated weekday name (``Sun'')
%A - The  full  weekday  name (``Sunday'')
%b - The abbreviated month name (``Jan'')
%B - The  full  month  name (``January'')
%c - The preferred local date and time representation
%d - Day of the month (01..31)
%H - Hour of the day, 24-hour clock (00..23)
%I - Hour of the day, 12-hour clock (01..12)
%j - Day of the year (001..366)
%m - Month of the year (01..12)
%M - Minute of the hour (00..59)
%p - Meridian indicator (``AM''  or  ``PM'')
%s - Number of seconds since 1970-01-01 00:00:00 UTC.
%S - Second of the minute (00..60)
%U - Week  number  of the current year,
        starting with the first Sunday as the first
        day of the first week (00..53)
%W - Week  number  of the current year,
        starting with the first Monday as the first
        day of the first week (00..53)
%w - Day of the week (Sunday is 0, 0..6)
%x - Preferred representation for the date alone, no time
%X - Preferred representation for the time alone, no date
%y - Year without a century (00..99)
%Y - Year with century
%Z - Time zone name
%% - Literal ``%'' character

See also: http://www.ruby-doc.org/core/Time.html#method-i-strftime



325
326
327
328
329
330
331
 
# File 'lib/liquid/standardfilters.rb', line 325

def date(input, format)
  return input if format.to_s.empty?

  return input unless date = Utils.to_date(input)

  date.strftime(format.to_s)
end

#default(input, default_value = ''.freeze) ⇒ Object 



422
423
424
425
426
427
428
 
# File 'lib/liquid/standardfilters.rb', line 422

def default(input, default_value = ''.freeze)
  if !input || input.respond_to?(:empty?) && input.empty?
    default_value
  else
    input
  end
end

#divided_by(input, operand) ⇒ Object

division



373
374
375
376
377
 
# File 'lib/liquid/standardfilters.rb', line 373

def divided_by(input, operand)
  apply_operation(input, operand, :/)
rescue ::ZeroDivisionError => e
  raise Liquid::ZeroDivisionError, e.message
end

#downcase(input) ⇒ Object

convert an input string to DOWNCASE



27
28
29
 
# File 'lib/liquid/standardfilters.rb', line 27

def downcase(input)
  input.to_s.downcase
end

#escape(input) ⇒ Object Also known as: h 



41
42
43
 
# File 'lib/liquid/standardfilters.rb', line 41

def escape(input)
  CGI.escapeHTML(input.to_s).untaint unless input.nil?
end

#escape_once(input) ⇒ Object 



46
47
48
 
# File 'lib/liquid/standardfilters.rb', line 46

def escape_once(input)
  input.to_s.gsub(HTML_ESCAPE_ONCE_REGEXP, HTML_ESCAPE)
end

#first(array) ⇒ Object

Get the first element of the passed in array

Example:

{{ product.images | first | to_img }}



338
339
340
 
# File 'lib/liquid/standardfilters.rb', line 338

def first(array)
  array.first if array.respond_to?(:first)
end

#floor(input) ⇒ Object 



400
401
402
403
404
 
# File 'lib/liquid/standardfilters.rb', line 400

def floor(input)
  Utils.to_number(input).floor.to_i
rescue ::FloatDomainError => e
  raise Liquid::FloatDomainError, e.message
end

#join(input, glue = ' '.freeze) ⇒ Object

Join elements of the array with certain character between them



128
129
130
 
# File 'lib/liquid/standardfilters.rb', line 128

def join(input, glue = ' '.freeze)
  InputIterator.new(input).join(glue)
end

#last(array) ⇒ Object

Get the last element of the passed in array

Example:

{{ product.images | last | to_img }}



347
348
349
 
# File 'lib/liquid/standardfilters.rb', line 347

def last(array)
  array.last if array.respond_to?(:last)
end

#lstrip(input) ⇒ Object 



107
108
109
 
# File 'lib/liquid/standardfilters.rb', line 107

def lstrip(input)
  input.to_s.lstrip
end

#map(input, property) ⇒ Object

map/collect on a given property



219
220
221
222
223
224
225
226
227
228
229
230
231
232
 
# File 'lib/liquid/standardfilters.rb', line 219

def map(input, property)
  InputIterator.new(input).map do |e|
    e = e.call if e.is_a?(Proc)

    if property == "to_liquid".freeze
      e
    elsif e.respond_to?(:[])
      r = e[property]
      r.is_a?(Proc) ? r.call : r
    end
  end
rescue TypeError
  raise_property_error(property)
end

#minus(input, operand) ⇒ Object

subtraction



363
364
365
 
# File 'lib/liquid/standardfilters.rb', line 363

def minus(input, operand)
  apply_operation(input, operand, :-)
end

#modulo(input, operand) ⇒ Object 



379
380
381
382
383
 
# File 'lib/liquid/standardfilters.rb', line 379

def modulo(input, operand)
  apply_operation(input, operand, :%)
rescue ::ZeroDivisionError => e
  raise Liquid::ZeroDivisionError, e.message
end

#newline_to_br(input) ⇒ Object

Add <br /> tags in front of all newlines in input string



290
291
292
 
# File 'lib/liquid/standardfilters.rb', line 290

def newline_to_br(input)
  input.to_s.gsub(/\n/, "<br />\n".freeze)
end

#plus(input, operand) ⇒ Object

addition



358
359
360
 
# File 'lib/liquid/standardfilters.rb', line 358

def plus(input, operand)
  apply_operation(input, operand, :+)
end

#prepend(input, string) ⇒ Object

prepend a string to another



285
286
287
 
# File 'lib/liquid/standardfilters.rb', line 285

def prepend(input, string)
  string.to_s + input.to_s
end

#remove(input, string) ⇒ Object

remove a substring



263
264
265
 
# File 'lib/liquid/standardfilters.rb', line 263

def remove(input, string)
  input.to_s.gsub(string.to_s, ''.freeze)
end

#remove_first(input, string) ⇒ Object

remove the first occurrences of a substring



268
269
270
 
# File 'lib/liquid/standardfilters.rb', line 268

def remove_first(input, string)
  input.to_s.sub(string.to_s, ''.freeze)
end

#replace(input, string, replacement = ''.freeze) ⇒ Object

Replace occurrences of a string with another



253
254
255
 
# File 'lib/liquid/standardfilters.rb', line 253

def replace(input, string, replacement = ''.freeze)
  input.to_s.gsub(string.to_s, replacement.to_s)
end

#replace_first(input, string, replacement = ''.freeze) ⇒ Object

Replace the first occurrences of a string with another



258
259
260
 
# File 'lib/liquid/standardfilters.rb', line 258

def replace_first(input, string, replacement = ''.freeze)
  input.to_s.sub(string.to_s, replacement.to_s)
end

#reverse(input) ⇒ Object

Reverse the elements of an array



213
214
215
216
 
# File 'lib/liquid/standardfilters.rb', line 213

def reverse(input)
  ary = InputIterator.new(input)
  ary.reverse
end

#round(input, n = 0) ⇒ Object 



385
386
387
388
389
390
391
392
 
# File 'lib/liquid/standardfilters.rb', line 385

def round(input, n = 0)
  result = Utils.to_number(input).round(Utils.to_number(n))
  result = result.to_f if result.is_a?(BigDecimal)
  result = result.to_i if n == 0
  result
rescue ::FloatDomainError => e
  raise Liquid::FloatDomainError, e.message
end

#rstrip(input) ⇒ Object 



111
112
113
 
# File 'lib/liquid/standardfilters.rb', line 111

def rstrip(input)
  input.to_s.rstrip
end

#size(input) ⇒ Object

Return the size of an array or of an string



22
23
24
 
# File 'lib/liquid/standardfilters.rb', line 22

def size(input)
  input.respond_to?(:size) ? input.size : 0
end

#slice(input, offset, length = nil) ⇒ Object 



63
64
65
66
67
68
69
70
71
72
 
# File 'lib/liquid/standardfilters.rb', line 63

def slice(input, offset, length = nil)
  offset = Utils.to_integer(offset)
  length = length ? Utils.to_integer(length) : 1

  if input.is_a?(Array)
    input.slice(offset, length) || []
  else
    input.to_s.slice(offset, length) || ''
  end
end

#sort(input, property = nil) ⇒ Object

Sort elements of the array provide optional property with which to sort an array of hashes or drops



134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
 
# File 'lib/liquid/standardfilters.rb', line 134

def sort(input, property = nil)
  ary = InputIterator.new(input)

  return [] if ary.empty?

  if property.nil?
    ary.sort do |a, b|
      nil_safe_compare(a, b)
    end
  elsif ary.all? { |el| el.respond_to?(:[]) }
    begin
      ary.sort { |a, b| nil_safe_compare(a[property], b[property]) }
    rescue TypeError
      raise_property_error(property)
    end
  end
end

#sort_natural(input, property = nil) ⇒ Object

Sort elements of an array ignoring case if strings provide optional property with which to sort an array of hashes or drops



154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
 
# File 'lib/liquid/standardfilters.rb', line 154

def sort_natural(input, property = nil)
  ary = InputIterator.new(input)

  return [] if ary.empty?

  if property.nil?
    ary.sort do |a, b|
      nil_safe_casecmp(a, b)
    end
  elsif ary.all? { |el| el.respond_to?(:[]) }
    begin
      ary.sort { |a, b| nil_safe_casecmp(a[property], b[property]) }
    rescue TypeError
      raise_property_error(property)
    end
  end
end

#split(input, pattern) ⇒ Object

Split input string into an array of substrings separated by given pattern.

Example:

<div class="summary">{{ post | split '//' | first }}</div>



99
100
101
 
# File 'lib/liquid/standardfilters.rb', line 99

def split(input, pattern)
  input.to_s.split(pattern.to_s)
end

#strip(input) ⇒ Object 



103
104
105
 
# File 'lib/liquid/standardfilters.rb', line 103

def strip(input)
  input.to_s.strip
end

#strip_html(input) ⇒ Object 



115
116
117
118
119
120
 
# File 'lib/liquid/standardfilters.rb', line 115

def strip_html(input)
  empty = ''.freeze
  result = input.to_s.gsub(STRIP_HTML_BLOCKS, empty)
  result.gsub!(STRIP_HTML_TAGS, empty)
  result
end

#strip_newlines(input) ⇒ Object

Remove all newlines from the string



123
124
125
 
# File 'lib/liquid/standardfilters.rb', line 123

def strip_newlines(input)
  input.to_s.gsub(/\r?\n/, ''.freeze)
end

#times(input, operand) ⇒ Object

multiplication



368
369
370
 
# File 'lib/liquid/standardfilters.rb', line 368

def times(input, operand)
  apply_operation(input, operand, :*)
end

#truncate(input, length = 50, truncate_string = "...".freeze) ⇒ Object

Truncate a string down to x characters



75
76
77
78
79
80
81
82
83
 
# File 'lib/liquid/standardfilters.rb', line 75

def truncate(input, length = 50, truncate_string = "...".freeze)
  return if input.nil?
  input_str = input.to_s
  length = Utils.to_integer(length)
  truncate_string_str = truncate_string.to_s
  l = length - truncate_string_str.length
  l = 0 if l < 0
  input_str.length > length ? input_str[0...l] + truncate_string_str : input_str
end

#truncatewords(input, words = 15, truncate_string = "...".freeze) ⇒ Object 



85
86
87
88
89
90
91
92
 
# File 'lib/liquid/standardfilters.rb', line 85

def truncatewords(input, words = 15, truncate_string = "...".freeze)
  return if input.nil?
  wordlist = input.to_s.split
  words = Utils.to_integer(words)
  l = words - 1
  l = 0 if l < 0
  wordlist.length > l ? wordlist[0..l].join(" ".freeze) + truncate_string.to_s : input
end

#uniq(input, property = nil) ⇒ Object

Remove duplicate elements from an array provide optional property with which to determine uniqueness



196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
 
# File 'lib/liquid/standardfilters.rb', line 196

def uniq(input, property = nil)
  ary = InputIterator.new(input)

  if property.nil?
    ary.uniq
  elsif ary.empty? # The next two cases assume a non-empty array.
    []
  elsif ary.first.respond_to?(:[])
    begin
      ary.uniq { |a| a[property] }
    rescue TypeError
      raise_property_error(property)
    end
  end
end

#upcase(input) ⇒ Object

convert an input string to UPCASE



32
33
34
 
# File 'lib/liquid/standardfilters.rb', line 32

def upcase(input)
  input.to_s.upcase
end

#url_decode(input) ⇒ Object

Raises:



54
55
56
57
58
59
60
61
 
# File 'lib/liquid/standardfilters.rb', line 54

def url_decode(input)
  return if input.nil?

  result = CGI.unescape(input.to_s)
  raise Liquid::ArgumentError, "invalid byte sequence in #{result.encoding}" unless result.valid_encoding?

  result
end

#url_encode(input) ⇒ Object 



50
51
52
 
# File 'lib/liquid/standardfilters.rb', line 50

def url_encode(input)
  CGI.escape(input.to_s) unless input.nil?
end

#where(input, property, target_value = nil) ⇒ Object

Filter the elements of an array to those with a certain property value. By default the target is any truthy value.



174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
 
# File 'lib/liquid/standardfilters.rb', line 174

def where(input, property, target_value = nil)
  ary = InputIterator.new(input)

  if ary.empty?
    []
  elsif ary.first.respond_to?(:[]) && target_value.nil?
    begin
      ary.select { |item| item[property] }
    rescue TypeError
      raise_property_error(property)
    end
  elsif ary.first.respond_to?(:[])
    begin
      ary.select { |item| item[property] == target_value }
    rescue TypeError
      raise_property_error(property)
    end
  end
end