class Liquid::If

If is the conditional block

{% if user.admin %}
  Admin user!
{% else %}
  Not admin user
{% endif %}

 There are {% if count < 5 %} less {% else %} more {% endif %} items than you need.

Constants

BOOLEAN_OPERATORS
ExpressionsAndOperators
Syntax
SyntaxHelp

Public Class Methods

new(tag_name, markup, tokens) click to toggle source
Calls superclass method
# File lib/liquid/tags/if.rb, line 20
def initialize(tag_name, markup, tokens)
  @blocks = []

  push_block('if', markup)

  super
end

Public Instance Methods

render(context) click to toggle source
# File lib/liquid/tags/if.rb, line 36
def render(context)
  context.stack do
    @blocks.each do |block|
      if block.evaluate(context)
        return render_all(block.attachment, context)
      end
    end
    ''
  end
end
unknown_tag(tag, markup, tokens) click to toggle source
Calls superclass method Liquid::Block#unknown_tag
# File lib/liquid/tags/if.rb, line 28
def unknown_tag(tag, markup, tokens)
  if ['elsif', 'else'].include?(tag)
    push_block(tag, markup)
  else
    super
  end
end

Private Instance Methods

push_block(tag, markup) click to toggle source
# File lib/liquid/tags/if.rb, line 49
def push_block(tag, markup)
  block = if tag == 'else'
    ElseCondition.new
  else

    expressions = markup.scan(ExpressionsAndOperators).reverse
    raise(SyntaxError, SyntaxHelp) unless expressions.shift =~ Syntax

    condition = Condition.new($1, $2, $3)

    while not expressions.empty?
      operator = (expressions.shift).to_s.strip

      raise(SyntaxError, SyntaxHelp) unless expressions.shift.to_s =~ Syntax

      new_condition = Condition.new($1, $2, $3)
      raise SyntaxError, "invalid boolean operator" unless BOOLEAN_OPERATORS.include?(operator)
      new_condition.send(operator, condition)
      condition = new_condition
    end

    condition
  end

  @blocks.push(block)
  @nodelist = block.attach(Array.new)
end