Class: Alterant::Alterant

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input:, modifier:, filename:, options: {}) ⇒ Alterant

input is a hash filename is the modifier filename use for the backtrace modifier is the script in string



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# File 'lib/alterant/alterant.rb', line 8

def initialize(input:, modifier:, filename:, options: {})
	@modifier = modifier
	@filename = filename
	@input = input
	@basedir = options[:basedir]
	@js_preload = options[:js_preload] || []
end

Instance Attribute Details

#basedir ⇒ Object (readonly)

Returns the value of attribute basedir.



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# File 'lib/alterant/alterant.rb', line 3

def basedir
  @basedir
end

Instance Method Details

#execute(timeout: 500, max_memory: 5000000) ⇒ Object

timeout is in ms returns a hash



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# File 'lib/alterant/alterant.rb', line 18

def execute(timeout: 500, max_memory: 5000000)
	jpath = ::Alterant::Helpers::Jpath.new

	result = []
	snapshot = MiniRacer::Snapshot.new("$$ = #{@input.to_json};\n" + @js_preload.join("\n")) # this is more efficient but we lose debug info (filename) of helper classes

	isolate = MiniRacer::Isolate.new(snapshot)
	@input.each_with_index do |input, idx|
		ctx = ::MiniRacer::Context.new(isolate: isolate, timeout: timeout, max_memory: max_memory)
		ctx.eval("$ = #{input.to_json}")
		ctx.eval("$['fetch'] = function(key) { return jpath.fetch(JSON.stringify($), key); }")
		ctx.attach('jpath.fetch', proc{|x, y| jpath.fetch(x, y)})
		ctx.attach('console.log', proc{|x| STDERR.puts("DEBUG: #{x.inspect}") if $debug })
		ctx.attach('console.exception', proc{|x| raise ::Alterant::RuntimeError, x })
		ctx.attach('$$.push', proc{|x| result << x })
		ctx.attach('$.index', proc{ idx })
		ctx.attach('YamlReader', ::Alterant::Classes::YamlReader.new(self, ctx))
		ctx.attach('JsonReader', ::Alterant::Classes::JsonReader.new(self, ctx))

		ctx.eval(@modifier, filename: @filename)
		pre_convert = ctx.eval("JSON.stringify($)")
		converted = JSON.parse(pre_convert)
		result << converted

		ctx.dispose
		isolate.idle_notification(100)
	rescue ::MiniRacer::RuntimeError => exc
		if $debug
			raise
		else
			raise ::Alterant::ParseError, "part: #{idx} - #{exc.message}, #{exc.backtrace.first}"
		end
	rescue ::Alterant::AlterantError => exc
		STDERR.puts exc.message.red
		return nil
	end

	return result
end