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module ActionView
module TemplateHandlers
module Compilable
def self.included(base)
base.extend ClassMethod
# Map method names to the names passed in local assigns so far
base.cattr_accessor :template_args
base.template_args = {}
end
module ClassMethod
# If a handler is mixin this module, set compilable to true
def compilable?
true
end
end
def render(template)
@view.send :execute, template
end
# Compile and evaluate the template's code
def compile_template(template)
return false unless compile_template?(template)
render_symbol = assign_method_name(template)
render_source = create_template_source(template, render_symbol)
begin
file_name = template.filename || 'compiled-template'
ActionView::Base::CompiledTemplates.module_eval(render_source, file_name, 0)
rescue Exception => e # errors from template code
if Base.logger
Base.logger.debug "ERROR: compiling #{render_symbol} RAISED #{e}"
Base.logger.debug "Function body: #{render_source}"
Base.logger.debug "Backtrace: #{e.backtrace.join("\n")}"
end
raise ActionView::TemplateError.new(template, @view.assigns, e)
end
end
private
# Method to check whether template compilation is necessary.
# The template will be compiled if the inline template or file has not been compiled yet,
# if local_assigns has a new key, which isn't supported by the compiled code yet.
def compile_template?(template)
# Unless the template has been complied yet, compile
return true unless render_symbol = @view.method_names[template.method_key]
# If template caching is disabled, compile
return true unless Base.cache_template_loading
# Always recompile inline templates
return true if template.is_a?(InlineTemplate)
# Unless local assigns support, recompile
return true unless supports_local_assigns?(render_symbol, template.locals)
# Otherwise, use compiled method
return false
end
def assign_method_name(template)
@view.method_names[template.method_key] ||= template.method_name
end
# Method to create the source code for a given template.
def create_template_source(template, render_symbol)
body = compile(template)
self.template_args[render_symbol] ||= {}
locals_keys = self.template_args[render_symbol].keys | template.locals.keys
self.template_args[render_symbol] = locals_keys.inject({}) { |h, k| h[k] = true; h }
locals_code = ""
locals_keys.each do |key|
locals_code << "#{key} = local_assigns[:#{key}];"
end
source = <<-end_src
def #{render_symbol}(local_assigns)
old_output_buffer = output_buffer;#{locals_code};#{body}
ensure
self.output_buffer = old_output_buffer
end
end_src
return source
end
# Return true if the given template was compiled for a superset of the keys in local_assigns
def supports_local_assigns?(render_symbol, local_assigns)
local_assigns.empty? ||
((args = self.template_args[render_symbol]) && local_assigns.all? { |k,_| args.has_key?(k) })
end
end
end
end
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