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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
EvalSpecs::A.new.c
describe "Kernel#eval" do
it "is a private method" do
Kernel.should have_private_instance_method(:eval)
end
it "is a module function" do
Kernel.respond_to?(:eval).should == true
end
it "evaluates the code within" do
eval("2 + 3").should == 5
end
it "coerces an object to string" do
eval(EvalSpecs::CoercedObject.new).should == 5
end
it "evaluates within the scope of the eval" do
EvalSpecs::A::B.name.should == "EvalSpecs::A::B"
end
it "evaluates such that consts are scoped to the class of the eval" do
EvalSpecs::A::C.name.should == "EvalSpecs::A::C"
end
it "finds a local in an enclosing scope" do
a = 1
eval("a").should == 1
end
it "updates a local in an enclosing scope" do
a = 1
eval("a = 2")
a.should == 2
end
it "updates a local in a surrounding block scope" do
EvalSpecs.new.f do
a = 1
eval("a = 2")
a.should == 2
end
end
it "updates a local in a scope above a surrounding block scope" do
a = 1
EvalSpecs.new.f do
eval("a = 2")
a.should == 2
end
a.should == 2
end
it "updates a local in a scope above when modified in a nested block scope" do
a = 1
es = EvalSpecs.new
eval("es.f { es.f { a = 2 } }")
a.should == 2
end
it "finds locals in a nested eval" do
eval('test = 10; eval("test")').should == 10
end
it "does not share locals across eval scopes" do
code = fixture __FILE__, "eval_locals.rb"
ruby_exe(code).chomp.should == "NameError"
end
it "doesn't accept a Proc object as a binding" do
x = 1
bind = proc {}
lambda { eval("x", bind) }.should raise_error(TypeError)
end
it "does not make Proc locals visible to evaluated code" do
bind = proc { inner = 4 }
lambda { eval("inner", bind.binding) }.should raise_error(NameError)
end
# REWRITE ME: This obscures the real behavior of where locals are stored
# in eval bindings.
it "allows a binding to be captured inside an eval" do
outer_binding = binding
level1 = eval("binding", outer_binding)
level2 = eval("binding", level1)
eval("x = 2", outer_binding)
eval("y = 3", level1)
eval("w=1", outer_binding)
eval("w", outer_binding).should == 1
eval("w=1", level1).should == 1
eval("w", level1).should == 1
eval("w=1", level2).should == 1
eval("w", level2).should == 1
eval("x", outer_binding).should == 2
eval("x=2", level1)
eval("x", level1).should == 2
eval("x=2", level2)
eval("x", level2).should == 2
eval("y=3", outer_binding)
eval("y", outer_binding).should == 3
eval("y=3", level1)
eval("y", level1).should == 3
eval("y=3", level2)
eval("y", level2).should == 3
end
it "uses the same scope for local variables when given the same binding" do
outer_binding = binding
eval("if false; a = 1; end", outer_binding)
eval("a", outer_binding).should be_nil
end
it "allows creating a new class in a binding" do
bind = proc {}
eval("class EvalBindingProcA; end; EvalBindingProcA.name", bind.binding).should =~ /EvalBindingProcA$/
end
it "allows creating a new class in a binding created by #eval" do
bind = eval "binding"
eval("class EvalBindingA; end; EvalBindingA.name", bind).should =~ /EvalBindingA$/
end
it "includes file and line information in syntax error" do
expected = 'speccing.rb'
lambda {
eval('if true',TOPLEVEL_BINDING, expected)
}.should raise_error(SyntaxError) { |e|
e.message.should =~ /#{expected}:1:.+/
}
end
it "evaluates string with given filename and negative linenumber" do
expected_file = 'speccing.rb'
lambda {
eval('if true',TOPLEVEL_BINDING, expected_file, -100)
}.should raise_error(SyntaxError) { |e|
e.message.should =~ /#{expected_file}:-100:.+/
}
end
it "sets constants at the toplevel from inside a block" do
# The class Object bit is needed to workaround some mspec oddness
class Object
[1].each { eval "Const = 1"}
Const.should == 1
remove_const :Const
end
end
it "uses the filename of the binding if none is provided" do
eval("__FILE__").should == "(eval)"
eval("__FILE__", binding).should == __FILE__
eval("__FILE__", binding, "success").should == "success"
eval("eval '__FILE__', binding").should == "(eval)"
eval("eval '__FILE__', binding", binding).should == __FILE__
eval("eval '__FILE__', binding", binding, 'success').should == 'success'
end
# Found via Rubinius bug github:#149
it "does not alter the value of __FILE__ in the binding" do
first_time = EvalSpecs.call_eval
second_time = EvalSpecs.call_eval
# This bug is seen by calling the method twice and comparing the values
# of __FILE__ each time. If the bug is present, calling eval will set the
# value of __FILE__ to the eval's "filename" argument.
second_time.should_not == "(eval)"
first_time.should == second_time
end
it "can be aliased" do
alias aliased_eval eval
x = 2
aliased_eval('x += 40')
x.should == 42
end
# See http://jira.codehaus.org/browse/JRUBY-5163
it "uses the receiver as self inside the eval" do
eval("self").should equal(self)
Kernel.eval("self").should equal(Kernel)
end
it "does not pass the block to the method being eval'ed" do
lambda {
eval('KernelSpecs::EvalTest.call_yield') { "content" }
}.should raise_error(LocalJumpError)
end
it "returns from the scope calling #eval when evaluating 'return'" do
lambda { eval("return :eval") }.call.should == :eval
end
it "unwinds through a Proc-style closure and returns from a lambda-style closure in the closure chain" do
code = fixture __FILE__, "eval_return_with_lambda.rb"
ruby_exe(code).chomp.should == "a,b,c,eval,f"
end
it "raises a LocalJumpError if there is no lambda-style closure in the chain" do
code = fixture __FILE__, "eval_return_without_lambda.rb"
ruby_exe(code).chomp.should == "a,b,c,e,LocalJumpError,f"
end
end
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