Class: Erubis::Engine

Inherits:
Object
  • Object
show all
Defined in:
lib/erubis/engine.rb

Overview

(abstract) abstract engine class. subclass must include evaluator and converter module.

Direct Known Subclasses

Basic::Engine, PI::Engine

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input = nil, properties = {}) ⇒ Engine

include Evaluator include Converter include Generator



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# File 'lib/erubis/engine.rb', line 25

def initialize(input=nil, properties={})
  #@input = input
  init_generator(properties)
  init_converter(properties)
  init_evaluator(properties)
  @src    = convert(input) if input
end

Class Method Details

.load_file(filename, properties = {}) ⇒ Object

load file, write cache file, and return engine object. this method create code cache file automatically. cachefile name can be specified with properties, or filname + ‘cache’ is used as default.



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# File 'lib/erubis/engine.rb', line 48

def self.load_file(filename, properties={})
  cachename = properties[:cachename] || (filename + '.cache')
  properties[:filename] = filename
  timestamp = File.mtime(filename)
  if test(?f, cachename) && timestamp == File.mtime(cachename)
    engine = self.new(nil, properties)
    engine.src = File.read(cachename)
  else
    input = File.open(filename, 'rb') {|f| f.read }
    engine = self.new(input, properties)
    tmpname = cachename + rand().to_s[1,8]
    File.open(tmpname, 'wb') {|f| f.write(engine.src) }
    File.rename(tmpname, cachename)
    File.utime(timestamp, timestamp, cachename)
  end
  engine.src.untaint   # ok?
  return engine
end

Instance Method Details

#convert!(input) ⇒ Object

convert input string and set it to @src



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# File 'lib/erubis/engine.rb', line 37

def convert!(input)
  @src = convert(input)
end

#process(input, context = nil, filename = nil) ⇒ Object

helper method to convert and evaluate input text with context object. context may be Binding, Hash, or Object.



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# File 'lib/erubis/engine.rb', line 72

def process(input, context=nil, filename=nil)
  code = convert(input)
  filename ||= '(erubis)'
  if context.is_a?(Binding)
    return eval(code, context, filename)
  else
    context = Context.new(context) if context.is_a?(Hash)
    return context.instance_eval(code, filename)
  end
end

#process_proc(proc_obj, context = nil, filename = nil) ⇒ Object

helper method evaluate Proc object with contect object. context may be Binding, Hash, or Object.



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# File 'lib/erubis/engine.rb', line 88

def process_proc(proc_obj, context=nil, filename=nil)
  if context.is_a?(Binding)
    filename ||= '(erubis)'
    return eval(proc_obj, context, filename)
  else
    context = Context.new(context) if context.is_a?(Hash)
    return context.instance_eval(&proc_obj)
  end
end