goose: add goose.Value directive

Subsumes previous usage of goose.Optional.

Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Tuo Shan <shantuo@google.com>

internal/goose/testdata/ExportedValue/bar/bar.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bar
+
+import "github.com/google/go-cloud/goose"
+
+var Value = goose.Value(PublicMsg)
+
+var PublicMsg = "Hello, World!"

internal/goose/testdata/ExportedValue/foo/foo.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(injectedMessage())
+}

internal/goose/testdata/ExportedValue/foo/goose.go

@@ -0,0 +1,26 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"bar"
+	"github.com/google/go-cloud/goose"
+)
+
+func injectedMessage() string {
+	panic(goose.Use(bar.Value))
+}

internal/goose/testdata/ExportedValue/out.txt

@@ -0,0 +1 @@
+Hello, World!

internal/goose/testdata/ExportedValue/pkg

@@ -0,0 +1 @@
+foo

internal/goose/testdata/ExportedValueDifferentPackage/bar/bar.go

@@ -0,0 +1,23 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bar
+
+import (
+	"os"
+
+	"github.com/google/go-cloud/goose"
+)
+
+var Value = goose.Value(os.Stdout)

internal/goose/testdata/ExportedValueDifferentPackage/foo/foo.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Fprintln(injectedFile(), "Hello, World!")
+}

internal/goose/testdata/ExportedValueDifferentPackage/foo/goose.go

@@ -0,0 +1,28 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"os"
+
+	"bar"
+	"github.com/google/go-cloud/goose"
+)
+
+func injectedFile() *os.File {
+	panic(goose.Use(bar.Value))
+}

internal/goose/testdata/ExportedValueDifferentPackage/out.txt

@@ -0,0 +1 @@
+Hello, World!

internal/goose/testdata/ExportedValueDifferentPackage/pkg

@@ -0,0 +1 @@
+foo

internal/goose/testdata/NiladicValue/foo/foo.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(injectedMessage())
+}

internal/goose/testdata/NiladicValue/foo/goose.go

@@ -0,0 +1,25 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"github.com/google/go-cloud/goose"
+)
+
+func injectedMessage() string {
+	panic(goose.Use(goose.Value("Hello, World!")))
+}

internal/goose/testdata/NiladicValue/out.txt

@@ -0,0 +1 @@
+Hello, World!

internal/goose/testdata/NiladicValue/pkg

@@ -0,0 +1 @@
+foo

internal/goose/testdata/UnexportedValue/bar/bar.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bar
+
+import "github.com/google/go-cloud/goose"
+
+var Value = goose.Value(privateMsg)
+
+var privateMsg = "Hello, World!"

internal/goose/testdata/UnexportedValue/foo/foo.go

@@ -0,0 +1,21 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(injectedMessage())
+}

internal/goose/testdata/UnexportedValue/foo/goose.go

@@ -0,0 +1,26 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"bar"
+	"github.com/google/go-cloud/goose"
+)
+
+func injectedMessage() string {
+	panic(goose.Use(bar.Value))
+}

internal/goose/testdata/UnexportedValue/out.txt

@@ -0,0 +1 @@
+ERROR

internal/goose/testdata/UnexportedValue/pkg

@@ -0,0 +1 @@
+foo

internal/goose/testdata/ValueChain/foo/foo.go

@@ -0,0 +1,36 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/google/go-cloud/goose"
+)
+
+func main() {
+	fmt.Println(injectFooBar())
+}
+
+type Foo int
+type FooBar int
+
+var Set = goose.NewSet(
+	goose.Value(Foo(41)),
+	provideFooBar)
+
+func provideFooBar(foo Foo) FooBar {
+	return FooBar(foo) + 1
+}

internal/goose/testdata/ValueChain/foo/goose.go

@@ -0,0 +1,25 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"github.com/google/go-cloud/goose"
+)
+
+func injectFooBar() FooBar {
+	panic(goose.Use(Set))
+}

internal/goose/testdata/ValueChain/out.txt

@@ -0,0 +1 @@
+42

internal/goose/testdata/ValueChain/pkg

@@ -0,0 +1 @@
+foo

internal/goose/testdata/ValueConversion/foo/foo.go

@@ -0,0 +1,23 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(injectedMessage())
+}
+
+type Foo string

internal/goose/testdata/ValueConversion/foo/goose.go

@@ -0,0 +1,25 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"github.com/google/go-cloud/goose"
+)
+
+func injectedMessage() Foo {
+	panic(goose.Use(goose.Value(Foo("Hello, World!"))))
+}

internal/goose/testdata/ValueConversion/out.txt

@@ -0,0 +1 @@
+Hello, World!

internal/goose/testdata/ValueConversion/pkg

@@ -0,0 +1 @@
+foo

internal/goose/testdata/VarValue/foo/foo.go

@@ -0,0 +1,26 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import "fmt"
+
+func main() {
+	// Value should be deferred until function call.
+	msg = "Hello, World!"
+
+	fmt.Println(injectedMessage())
+}
+
+var msg string

internal/goose/testdata/VarValue/foo/goose.go

@@ -0,0 +1,25 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//+build gooseinject
+
+package main
+
+import (
+	"github.com/google/go-cloud/goose"
+)
+
+func injectedMessage() string {
+	panic(goose.Use(goose.Value(msg)))
+}

internal/goose/testdata/VarValue/out.txt

@@ -0,0 +1 @@
+Hello, World!

internal/goose/testdata/VarValue/pkg

@@ -0,0 +1 @@
+foo