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// Copyright 2017 Google Inc. All rights reserved.
//
// 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
//
// http://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 android
import (
"strings"
"github.com/google/blueprint"
"github.com/google/blueprint/proptools"
)
// TODO(ccross): protos are often used to communicate between multiple modules. If the only
// way to convert a proto to source is to reference it as a source file, and external modules cannot
// reference source files in other modules, then every module that owns a proto file will need to
// export a library for every type of external user (lite vs. full, c vs. c++ vs. java). It would
// be better to support a proto module type that exported a proto file along with some include dirs,
// and then external modules could depend on the proto module but use their own settings to
// generate the source.
type ProtoFlags struct {
Flags []string
CanonicalPathFromRoot bool
Dir ModuleGenPath
SubDir ModuleGenPath
OutTypeFlag string
OutParams []string
Deps Paths
}
type protoDependencyTag struct {
blueprint.BaseDependencyTag
name string
}
var ProtoPluginDepTag = protoDependencyTag{name: "plugin"}
func ProtoDeps(ctx BottomUpMutatorContext, p *ProtoProperties) {
if String(p.Proto.Plugin) != "" && String(p.Proto.Type) != "" {
ctx.ModuleErrorf("only one of proto.type and proto.plugin can be specified.")
}
if plugin := String(p.Proto.Plugin); plugin != "" {
ctx.AddFarVariationDependencies(ctx.Config().BuildOSTarget.Variations(),
ProtoPluginDepTag, "protoc-gen-"+plugin)
}
}
func GetProtoFlags(ctx ModuleContext, p *ProtoProperties) ProtoFlags {
var flags []string
var deps Paths
if len(p.Proto.Local_include_dirs) > 0 {
localProtoIncludeDirs := PathsForModuleSrc(ctx, p.Proto.Local_include_dirs)
flags = append(flags, JoinWithPrefix(localProtoIncludeDirs.Strings(), "-I"))
}
if len(p.Proto.Include_dirs) > 0 {
rootProtoIncludeDirs := PathsForSource(ctx, p.Proto.Include_dirs)
flags = append(flags, JoinWithPrefix(rootProtoIncludeDirs.Strings(), "-I"))
}
ctx.VisitDirectDepsWithTag(ProtoPluginDepTag, func(dep Module) {
if hostTool, ok := dep.(HostToolProvider); !ok || !hostTool.HostToolPath().Valid() {
ctx.PropertyErrorf("proto.plugin", "module %q is not a host tool provider",
ctx.OtherModuleName(dep))
} else {
plugin := String(p.Proto.Plugin)
deps = append(deps, hostTool.HostToolPath().Path())
flags = append(flags, "--plugin=protoc-gen-"+plugin+"="+hostTool.HostToolPath().String())
}
})
var protoOutFlag string
if plugin := String(p.Proto.Plugin); plugin != "" {
protoOutFlag = "--" + plugin + "_out"
}
return ProtoFlags{
Flags: flags,
Deps: deps,
OutTypeFlag: protoOutFlag,
CanonicalPathFromRoot: proptools.BoolDefault(p.Proto.Canonical_path_from_root, true),
Dir: PathForModuleGen(ctx, "proto"),
SubDir: PathForModuleGen(ctx, "proto", ctx.ModuleDir()),
}
}
type ProtoProperties struct {
Proto struct {
// Proto generator type. C++: full or lite. Java: micro, nano, stream, or lite.
Type *string `android:"arch_variant"`
// Proto plugin to use as the generator. Must be a cc_binary_host module.
Plugin *string `android:"arch_variant"`
// list of directories that will be added to the protoc include paths.
Include_dirs []string
// list of directories relative to the bp file that will
// be added to the protoc include paths.
Local_include_dirs []string
// whether to identify the proto files from the root of the
// source tree (the original method in Android, useful for
// android-specific protos), or relative from where they were
// specified (useful for external/third party protos).
//
// This defaults to true today, but is expected to default to
// false in the future.
Canonical_path_from_root *bool
} `android:"arch_variant"`
}
func ProtoRule(ctx ModuleContext, rule *RuleBuilder, protoFile Path, flags ProtoFlags, deps Paths,
outDir WritablePath, depFile WritablePath, outputs WritablePaths) {
var protoBase string
if flags.CanonicalPathFromRoot {
protoBase = "."
} else {
rel := protoFile.Rel()
protoBase = strings.TrimSuffix(protoFile.String(), rel)
}
rule.Command().
BuiltTool(ctx, "aprotoc").
FlagWithArg(flags.OutTypeFlag+"=", strings.Join(flags.OutParams, ",")+":"+outDir.String()).
FlagWithDepFile("--dependency_out=", depFile).
FlagWithArg("-I ", protoBase).
Flags(flags.Flags).
Input(protoFile).
Implicits(deps).
ImplicitOutputs(outputs)
rule.Command().
BuiltTool(ctx, "dep_fixer").Flag(depFile.String())
}
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