# frozen_string_literal: true module Liquid class Render < Tag FOR = 'for' SYNTAX = /(#{QuotedString}+)(\s+(with|#{FOR})\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o disable_tags "include" attr_reader :template_name_expr, :attributes def initialize(tag_name, markup, options) super raise SyntaxError, options[:locale].t("errors.syntax.render") unless markup =~ SYNTAX template_name = Regexp.last_match(1) with_or_for = Regexp.last_match(3) variable_name = Regexp.last_match(4) @alias_name = Regexp.last_match(6) @variable_name_expr = variable_name ? parse_expression(variable_name) : nil @template_name_expr = parse_expression(template_name) @for = (with_or_for == FOR) @attributes = {} markup.scan(TagAttributes) do |key, value| @attributes[key] = parse_expression(value) end end def render_to_output_buffer(context, output) render_tag(context, output) end def render_tag(context, output) # Though we evaluate this here we will only ever parse it as a string literal. template_name = context.evaluate(@template_name_expr) raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name partial = PartialCache.load( template_name, context: context, parse_context: parse_context ) context_variable_name = @alias_name || template_name.split('/').last render_partial_func = ->(var, forloop) { inner_context = context.new_isolated_subcontext inner_context.template_name = template_name inner_context.partial = true inner_context['forloop'] = forloop if forloop @attributes.each do |key, value| inner_context[key] = context.evaluate(value) end inner_context[context_variable_name] = var unless var.nil? partial.render_to_output_buffer(inner_context, output) forloop&.send(:increment!) } variable = @variable_name_expr ? context.evaluate(@variable_name_expr) : nil if @for && variable.respond_to?(:each) && variable.respond_to?(:count) forloop = Liquid::ForloopDrop.new(template_name, variable.count, nil) variable.each { |var| render_partial_func.call(var, forloop) } else render_partial_func.call(variable, nil) end output end class ParseTreeVisitor < Liquid::ParseTreeVisitor def children [ @node.template_name_expr, ] + @node.attributes.values end end end Template.register_tag('render', Render) end