Class: Liquid::For
Constant Summary collapse
- Syntax =
/(\w+)\s+in\s+(#{VariableSignature}+)/
Instance Attribute Summary
Attributes inherited from Tag
Instance Method Summary collapse
-
#initialize(markup, tokens) ⇒ For
constructor
A new instance of For.
- #render(context) ⇒ Object
Methods inherited from Block
#block_delimiter, #block_name, #create_variable, #end_tag, #parse, #unknown_tag
Methods inherited from Tag
Constructor Details
#initialize(markup, tokens) ⇒ For
Returns a new instance of For.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
# File 'lib/liquid/tags/for.rb', line 5 def initialize(markup, tokens) super if markup =~ Syntax @variable_name = $1 @collection_name = $2 @name = "#{$1}-#{$2}" @attributes = {} markup.scan(TagAttributes) do |key, value| @attributes[key] = value end else raise SyntaxError.new("Syntax Error in 'for loop' - Valid syntax: for [item] in [collection]") end end |
Instance Method Details
#render(context) ⇒ Object
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 |
# File 'lib/liquid/tags/for.rb', line 21 def render(context) context.registers[:for] ||= Hash.new(0) collection = context[@collection_name] return '' if collection.nil? or collection.empty? range = (0..collection.length) if @attributes['limit'] or @attributes['offset'] offset = 0 if @attributes['offset'] == 'continue' offset = context.registers[:for][@name] else offset = context[@attributes['offset']] || 0 end limit = context[@attributes['limit']] range_end = limit ? offset + limit : collection.length range = (offset..range_end-1) # Save the range end in the registers so that future calls to # offset:continue have something to pick up context.registers[:for][@name] = range_end end result = [] segment = collection[range] return '' if segment.nil? context.stack do length = segment.length segment.each_with_index do |item, index| context[@variable_name] = item context['forloop'] = { 'name' => @name, 'length' => length, 'index' => index + 1, 'index0' => index, 'rindex' => length - index, 'rindex0' => length - index -1, 'first' => (index == 0), 'last' => (index == length - 1) } result << render_all(@nodelist, context) end end # Store position of last element we rendered. This allows us to do result end |