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therubyracer/lib/v8/error.rb

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module V8
class JSError < StandardError
attr_reader :value, :boundaries
def initialize(try)
begin
super(initialize_unsafe(try))
rescue Exception => e
@boundaries = Boundary.new(:rbframes => e.backtrace)
@value = e
super("BUG! please report. JSError#initialize failed!: #{e.message}")
end
end
def initialize_unsafe(try)
message = nil
ex = To.rb(try.Exception())
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@boundaries = [Boundary.new(:rbframes => caller(3), :jsframes => parse_js_frames(try))]
if V8::Object === ex
if msg = ex['message']
message = msg
else
message = ex.to_s
end
if cause = ex.instance_variable_get(:@native).GetHiddenValue("TheRubyRacer::Cause")
if !cause.IsEmpty()
prev = cause.Value()
if prev.kind_of?(JSError)
@boundaries.concat prev.boundaries
@value = prev.value
else
@value = prev
@boundaries.concat [Boundary.new(:rbframes => prev.backtrace)]
end
else
@value = ex
end
end
else
@value = ex
message = ex.to_s
@boundaries.first.jsframes << 'at [???].js'
end
return message
end
def in_ruby?
@value.kind_of?(Exception)
end
def in_javascript?
!in_ruby?
end
def backtrace(*modifiers)
trace_framework = modifiers.include?(:framework)
trace_ruby = modifiers.length == 0 || modifiers.include?(:ruby)
trace_javascript = modifiers.length == 0 || modifiers.include?(:javascript)
mixed = []
rbcontext = []
jscontext = []
@boundaries.each do |b|
rbframes = b.rbframes.dup
rbcontext.reverse_each do |frame|
if frame == rbframes.last
rbframes.pop
else
break
end
end if trace_ruby
jsframes = b.jsframes.dup
jscontext.reverse_each do |frame|
if frame == jsframes.last
jsframes.pop
else
break
end
end if trace_javascript
rbcontext = b.rbframes
jscontext = b.jsframes
rbframes.reject! {|f| f =~ /lib\/v8\/\w+\.rb/} unless trace_framework
mixed.unshift(*rbframes) if trace_ruby
mixed.unshift(*jsframes) if trace_javascript
end
return mixed
end
def parse_js_frames(try)
raw = To.rb(try.StackTrace())
if raw && !raw.empty?
raw.split("\n")[1..-1].tap do |frames|
frames.each {|frame| frame.strip!.chomp!(",")}
end
else
[]
end
end
class Boundary
attr_reader :rbframes, :jsframes
def initialize(frames = {})
@rbframes = frames[:rbframes] || []
@jsframes = frames[:jsframes] || []
end
end
end
#deprecated -- use JSError
JavasriptError = JSError
end