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Ary Borenszweig
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#!/usr/bin/env bin/crystal -run
require "../../spec_helper"
describe "Codegen: is_a?" do
it "codegens is_a? true for simple type" do
run("1.is_a?(Int)").to_b.should be_true
end
it "codegens is_a? false for simple type" do
run("1.is_a?(Bool)").to_b.should be_false
end
it "codegens is_a? with union gives true" do
run("(1 == 1 ? 1 : 'a').is_a?(Int)").to_b.should be_true
end
it "codegens is_a? with union gives false" do
run("(1 == 1 ? 1 : 'a').is_a?(Char)").to_b.should be_false
end
it "codegens is_a? with union gives false" do
run("(1 == 1 ? 1 : 'a').is_a?(Float)").to_b.should be_false
end
it "codegens is_a? with union gives true" do
run("(1 == 1 ? 1 : 'a').is_a?(Object)").to_b.should be_true
end
it "codegens is_a? with nilable gives true" do
run("(1 == 1 ? nil : Reference.new).is_a?(Nil)").to_b.should be_true
end
it "codegens is_a? with nilable gives false becuase other type 1" do
run("(1 == 1 ? nil : Reference.new).is_a?(Reference)").to_b.should be_false
end
it "codegens is_a? with nilable gives false becuase other type 2" do
run("(1 == 2 ? nil : Reference.new).is_a?(Reference)").to_b.should be_true
end
it "codegens is_a? with nilable gives false becuase no type" do
run("(1 == 2 ? nil : Reference.new).is_a?(String)").to_b.should be_false
end
it "codegens is_a? with nilable gives false becuase no type" do
run("1.is_a?(Object)").to_b.should be_true
end
it "evaluate method on filtered type" do
run("a = 1; a = 'a'; if a.is_a?(Char); a.ord; else; 0; end").to_i.chr.should eq('a')
end
it "evaluate method on filtered type nilable type not-nil" do
run("
class Foo
def foo
1
end
end
a = nil
a = Foo.new
if a.is_a?(Foo)
a.foo
else
2
end
").to_i.should eq(1)
end
it "evaluate method on filtered type nilable type nil" do
run("
class Nil
def foo
1
end
end
class Foo
end
a = Foo.new
a = nil
if a.is_a?(Nil)
a.foo
else
2
end
").to_i.should eq(1)
end
it "evaluates method on filtered union type" do
run("
class Foo
def initialize(x)
@x = x
end
def x
@x
end
end
a = 1
a = Foo.new(2)
if a.is_a?(Reference)
a.x
else
0
end
").to_i.should eq(2)
end
it "evaluates method on filtered union type 2" do
run("
class Foo
def initialize(x)
@x = x
end
def x
@x
end
end
class Bar
def initialize(x)
@x = x
end
def x
@x
end
end
a = 1
a = Foo.new(2)
a = Bar.new(3)
if a.is_a?(Reference)
a.x
else
0
end
").to_i.should eq(3)
end
it "evaluates method on filtered union type 3" do
run("
require \"prelude\"
a = 1
a = [1.1]
a = [5]
if a.is_a?(Enumerable)
a[0]
else
0
end.to_i
").to_i.should eq(5)
end
it "codegens when is_a? is always false but properties are used" do
run("
class Foo
def obj; 1 end
end
foo = 1
foo.is_a?(Foo) && foo.obj && foo.obj
").to_b.should be_false
end
it "codegens is_a? on right side of and" do
run("
class Foo
def bar
true
end
end
foo = Foo.new || nil
if 1 == 1 && foo.is_a?(Foo) && foo.bar
1
else
2
end
").to_i.should eq(1)
end
it "codegens is_a? with hierarchy" do
run("
class Foo
end
class Bar < Foo
end
foo = Bar.new || Foo.new
foo.is_a?(Bar) ? 1 : 2
").to_i.should eq(1)
end
it "codegens is_a? with hierarchy and nil" do
run("
class Foo
end
class Bar < Foo
end
f = Foo.new || Bar.new || nil
f.is_a?(Foo) ? 1 : 2
").to_i.should eq(1)
end
it "codegens is_a? with hierarchy and module" do
run("
module Bar
end
abstract class FooBase2
end
abstract class FooBase < FooBase2
include Bar
end
class Foo < FooBase
end
class Foo2 < FooBase2
end
f = Foo.new || Foo2.new
f.is_a?(Bar)
").to_b.should be_true
end
it "restricts simple type with union" do
run("
a = 1
if a.is_a?(Int32 | Char)
a + 1
else
0
end
").to_i.should eq(2)
end
it "restricts union with union" do
run("
class Char
def +(other : Int32)
other
end
end
class Bool
def foo
2
end
end
a = 1 || 'a' || false
if a.is_a?(Int32 | Char)
a + 2
else
a.foo
end
").to_i.should eq(3)
end