/
johnson_runtime.rb
112 lines (95 loc) · 2.4 KB
/
johnson_runtime.rb
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module ExecJS
class JohnsonRuntime
class Context
def initialize(source = "")
@runtime = Johnson::Runtime.new
@runtime.evaluate(source)
end
def exec(source, options = {})
souce = source.encode('UTF-8') if source.respond_to?(:encode)
if /\S/ =~ source
eval "(function(){#{source}})()", options
end
end
def eval(source, options = {})
souce = source.encode('UTF-8') if source.respond_to?(:encode)
if /\S/ =~ source
unbox @runtime.evaluate("(#{source})")
end
rescue Johnson::Error => e
if syntax_error?(e)
raise RuntimeError, e.message
else
raise ProgramError, e.message
end
end
def call(properties, *args)
unbox @runtime.evaluate(properties).call(*args)
rescue Johnson::Error => e
if syntax_error?(e)
raise RuntimeError, e.message
else
raise ProgramError, e.message
end
end
def unbox(value)
case
when function?(value)
nil
when string?(value)
value.respond_to?(:force_encoding) ?
value.force_encoding('UTF-8') :
value
when array?(value)
value.map { |v| unbox(v) }
when object?(value)
value.inject({}) do |vs, (k, v)|
vs[k] = unbox(v) unless function?(v)
vs
end
else
value
end
end
private
def syntax_error?(error)
error.message =~ /^syntax error at /
end
def function?(value)
value.respond_to?(:function?) && value.function?
end
def string?(value)
value.is_a?(String)
end
def array?(value)
array_test.call(value)
end
def object?(value)
value.respond_to?(:inject)
end
def array_test
@array_test ||= @runtime.evaluate("(function(a) {return a instanceof [].constructor})")
end
end
def name
"Johnson (SpiderMonkey)"
end
def exec(source)
context = Context.new
context.exec(source)
end
def eval(source)
context = Context.new
context.eval(source)
end
def compile(source)
Context.new(source)
end
def available?
require "johnson"
true
rescue LoadError
false
end
end
end