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require "set"
module BetterErrors
# @private
class StackFrame
def self.from_exception(exception)
RaisedException.new(exception).backtrace
end
attr_reader :filename, :line, :name, :frame_binding
def initialize(filename, line, name, frame_binding = nil)
@filename = filename
@line = line
@name = name
@frame_binding = frame_binding
set_pretty_method_name if frame_binding
end
def application?
if root = BetterErrors.application_root
filename.index(root) == 0 && filename.index("#{root}/vendor") != 0
end
end
def application_path
filename[(BetterErrors.application_root.length+1)..-1]
end
def gem?
Gem.path.any? { |path| filename.index(path) == 0 }
end
def gem_path
if path = Gem.path.detect { |p| filename.index(p) == 0 }
gem_name_and_version, path = filename.sub("#{path}/gems/", "").split("/", 2)
/(?<gem_name>.+)-(?<gem_version>[\w.]+)/ =~ gem_name_and_version
"#{gem_name} (#{gem_version}) #{path}"
end
end
def class_name
@class_name
end
def method_name
@method_name || @name
end
def context
if gem?
:gem
elsif application?
:application
else
:dunno
end
end
def pretty_path
case context
when :application; application_path
when :gem; gem_path
else filename
end
end
def local_variables
return {} unless frame_binding
frame_binding.eval("local_variables").each_with_object({}) do |name, hash|
if defined?(frame_binding.local_variable_get)
hash[name] = frame_binding.local_variable_get(name)
else
hash[name] = frame_binding.eval(name.to_s)
end
end
end
def instance_variables
return {} unless frame_binding
Hash[visible_instance_variables.map { |x|
[x, frame_binding.eval(x.to_s)]
}]
end
def visible_instance_variables
frame_binding.eval("instance_variables") - BetterErrors.ignored_instance_variables
end
def to_s
"#{pretty_path}:#{line}:in `#{name}'"
end
private
def set_pretty_method_name
name =~ /\A(block (\([^)]+\) )?in )?/
recv = frame_binding.eval("self")
return unless method_name = frame_binding.eval("::Kernel.__method__")
if Module === recv
@class_name = "#{$1}#{recv}"
@method_name = ".#{method_name}"
else
@class_name = "#{$1}#{Kernel.instance_method(:class).bind(recv).call}"
@method_name = "##{method_name}"
end
end
end
end
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