module Liquid
class Case < Block
Syntax = /(#{QuotedFragment})/
WhenSyntax = /(#{QuotedFragment})(?:(?:\s+or\s+|\s*\,\s*)(#{QuotedFragment}.*))?/
def initialize(tag_name, markup, tokens)
@blocks = []
if markup =~ Syntax
@left = $1
else
raise SyntaxError.new("Syntax Error in tag 'case' - Valid syntax: case [condition]")
end
super
end
def unknown_tag(tag, markup, tokens)
@nodelist = []
case tag
when 'when'
record_when_condition(markup)
when 'else'
record_else_condition(markup)
else
super
end
end
def render(context)
context.stack do
execute_else_block = true
@blocks.inject([]) do |output, block|
if block.else?
return render_all(block.attachment, context) if execute_else_block
elsif block.evaluate(context)
execute_else_block = false
output += render_all(block.attachment, context)
end
output
end
end
end
private
def record_when_condition(markup)
while markup
# Create a new nodelist and assign it to the new block
if not markup =~ WhenSyntax
raise SyntaxError.new("Syntax Error in tag 'case' - Valid when condition: {% when [condition] [or condition2...] %} ")
end
markup = $2
block = Condition.new(@left, '==', $1)
block.attach(@nodelist)
@blocks.push(block)
end
end
def record_else_condition(markup)
if not markup.strip.empty?
raise SyntaxError.new("Syntax Error in tag 'case' - Valid else condition: {% else %} (no parameters) ")
end
block = ElseCondition.new
block.attach(@nodelist)
@blocks << block
end
end
Template.register_tag('case', Case)
end
