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require_relative '../spec_helper'
describe "Ruby's reserved keywords" do
# Copied from https://github.com/ruby/ruby/blob/master/defs/keywords
keywords = %w[
alias
and
begin
BEGIN
break
case
class
def
defined?
do
else
elsif
end
END
ensure
false
for
if
in
module
next
nil
not
or
redo
rescue
retry
return
self
super
then
true
undef
unless
until
when
while
yield
__ENCODING__
__FILE__
__LINE__
]
keywords.each do |name|
describe "keyword '#{name}'" do
it "can't be used as local variable name" do
-> { eval(<<~RUBY) }.should raise_error(SyntaxError)
#{name} = :local_variable
RUBY
end
if name == "defined?"
it "can't be used as an instance variable name" do
-> { eval(<<~RUBY) }.should raise_error(SyntaxError)
@#{name} = :instance_variable
RUBY
end
it "can't be used as a class variable name" do
-> { eval(<<~RUBY) }.should raise_error(SyntaxError)
class C
@@#{name} = :class_variable
end
RUBY
end
it "can't be used as a global variable name" do
-> { eval(<<~RUBY) }.should raise_error(SyntaxError)
$#{name} = :global_variable
RUBY
end
else
it "can be used as an instance variable name" do
result = eval <<~RUBY
@#{name} = :instance_variable
@#{name}
RUBY
result.should == :instance_variable
end
it "can be used as a class variable name" do
result = eval <<~RUBY
class C
@@#{name} = :class_variable
@@#{name}
end
RUBY
result.should == :class_variable
end
it "can be used as a global variable name" do
result = eval <<~RUBY
$#{name} = :global_variable
$#{name}
RUBY
result.should == :global_variable
end
end
it "can't be used as a positional parameter name" do
-> { eval(<<~RUBY) }.should raise_error(SyntaxError)
def x(#{name}); end
RUBY
end
invalid_kw_param_names = ["BEGIN","END","defined?"]
if invalid_kw_param_names.include?(name)
it "can't be used a keyword parameter name" do
-> { eval(<<~RUBY) }.should raise_error(SyntaxError)
def m(#{name}:); end
RUBY
end
else
it "can be used a keyword parameter name" do
result = instance_eval <<~RUBY
def m(#{name}:)
binding.local_variable_get(:#{name})
end
m(#{name}: :argument)
RUBY
result.should == :argument
end
end
it "can be used as a method name" do
result = instance_eval <<~RUBY
def #{name}
:method_return_value
end
send(:#{name})
RUBY
result.should == :method_return_value
end
end
end
end
|
