Toolchain deps infra

WORKSPACE

@@ -171,6 +171,7 @@ java_import_external(
     jar_urls = ["https://repo.maven.apache.org/maven2/org/apache/commons/commons-lang3/3.5/commons-lang3-3.5.jar"],
     licenses = ["notice"],  # Apache 2.0
     neverlink = True,
+    testonly_ = True,
 )
 
 ## Linting

docs/scala_toolchain.md

@@ -23,9 +23,17 @@ scala_register_toolchains()
     ```python
     # //toolchains/BUILD
     load("@io_bazel_rules_scala//scala:scala_toolchain.bzl", "scala_toolchain")
+    load("@io_bazel_rules_scala//scala:providers.bzl", "declare_deps_provider")
 
     scala_toolchain(
         name = "my_toolchain_impl",
+        dep_providers = [
+            ":my_scala_compile_classpath_provider",
+            ":my_scala_library_classpath_provider",
+            ":my_scala_macro_classpath_provider",
+            ":my_scala_xml_provider",
+            ":my_parser_combinators_provider",
+        ],
         scalacopts = ["-Ywarn-unused"],
         unused_dependency_checker_mode = "off",
         visibility = ["//visibility:public"]
@@ -37,6 +45,47 @@ scala_register_toolchains()
         toolchain = "my_toolchain_impl",
         visibility = ["//visibility:public"]
     )
+
+    declare_deps_provider(
+        name = "my_scala_compile_classpath_provider",
+        deps_id = "scala_compile_classpath",
+        visibility = ["//visibility:public"],
+        deps = [
+            "//external:io_bazel_rules_scala/dependency/scala/scala_compiler",
+            "//external:io_bazel_rules_scala/dependency/scala/scala_library",
+            "//external:io_bazel_rules_scala/dependency/scala/scala_reflect",
+        ],
+    )
+
+    declare_deps_provider(
+        name = "my_scala_library_classpath_provider",
+        deps_id = "scala_library_classpath",
+        deps = [
+            "//external:io_bazel_rules_scala/dependency/scala/scala_library",
+            "//external:io_bazel_rules_scala/dependency/scala/scala_reflect",
+        ],
+    )
+
+    declare_deps_provider(
+        name = "my_scala_macro_classpath_provider",
+        deps_id = "scala_macro_classpath",
+        deps = [
+            "//external:io_bazel_rules_scala/dependency/scala/scala_library",
+            "//external:io_bazel_rules_scala/dependency/scala/scala_reflect",
+        ],
+    )
+
+    declare_deps_provider(
+        name = "my_scala_xml_provider",
+        deps_id = "scala_xml",
+        deps = ["@scala_xml_dep"],
+    )
+
+    declare_deps_provider(
+        name = "my_parser_combinators_provider",
+        deps_id = "parser_combinators",
+        deps = ["@parser_combinators_dep"],
+    )
     ```
 
 2. Register your custom toolchain from `WORKSPACE`:
@@ -56,6 +105,18 @@ scala_register_toolchains()
     </tr>
   </thead>
   <tbody>
+    <tr>
+      <td><code>dep_providers</code></td>
+      <td>
+        <p><code>List of labels; optional</code></p>
+        <p>
+          Allows to configure dependencies lists by configuring <code>DepInfo</code> provider targets. 
+          Currently supported depset ids: <code>scala_compile_classpath</code>, 
+          <code>scala_library_classpath</code>, <code>scala_macro_classpath</code>, <code>scala_xml</code>, 
+          <code>parser_combinators</code>.     
+        </p>
+      </td>
+    </tr>
     <tr>
       <td><code>scalacopts</code></td>
       <td>
@@ -109,4 +170,4 @@ scala_register_toolchains()
       </td>
     </tr>
   </tbody>
-</table>
+</table>

scala/BUILD

@@ -1,9 +1,7 @@
 load("@rules_java//java:defs.bzl", "java_import", "java_library")
-load(
-    "@io_bazel_rules_scala//scala:providers.bzl",
-    _declare_scalac_provider = "declare_scalac_provider",
-)
 load("//scala:scala_toolchain.bzl", "scala_toolchain")
+load("//scala/toolchains:toolchains.bzl", "declare_deps_toolchain")
+load("//scala:providers.bzl", "declare_deps_provider")
 
 toolchain_type(
     name = "toolchain_type",
@@ -71,26 +69,53 @@ java_import(
     visibility = ["//visibility:public"],
 )
 
-_declare_scalac_provider(
-    name = "scalac_default",
-    default_classpath = [
+java_library(
+    name = "PlaceHolderClassToCreateEmptyJarForScalaImport",
+    srcs = ["PlaceHolderClassToCreateEmptyJarForScalaImport.java"],
+    visibility = ["//visibility:public"],
+)
+
+declare_deps_provider(
+    name = "scala_compile_classpath_provider",
+    deps_id = "scala_compile_classpath",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//external:io_bazel_rules_scala/dependency/scala/scala_compiler",
         "//external:io_bazel_rules_scala/dependency/scala/scala_library",
         "//external:io_bazel_rules_scala/dependency/scala/scala_reflect",
     ],
-    default_macro_classpath = [
+)
+
+declare_deps_provider(
+    name = "scala_library_classpath_provider",
+    deps_id = "scala_library_classpath",
+    visibility = ["//visibility:public"],
+    deps = [
         "//external:io_bazel_rules_scala/dependency/scala/scala_library",
         "//external:io_bazel_rules_scala/dependency/scala/scala_reflect",
     ],
-    default_repl_classpath = [
+)
+
+declare_deps_provider(
+    name = "scala_macro_classpath_provider",
+    deps_id = "scala_macro_classpath",
+    visibility = ["//visibility:public"],
+    deps = [
         "//external:io_bazel_rules_scala/dependency/scala/scala_library",
         "//external:io_bazel_rules_scala/dependency/scala/scala_reflect",
-        "//external:io_bazel_rules_scala/dependency/scala/scala_compiler",
     ],
+)
+
+declare_deps_provider(
+    name = "scala_xml_provider",
+    deps_id = "scala_xml",
     visibility = ["//visibility:public"],
+    deps = ["//external:io_bazel_rules_scala/dependency/scala/scala_xml"],
 )
 
-java_library(
-    name = "PlaceHolderClassToCreateEmptyJarForScalaImport",
-    srcs = ["PlaceHolderClassToCreateEmptyJarForScalaImport.java"],
+declare_deps_provider(
+    name = "parser_combinators_provider",
+    deps_id = "parser_combinators",
     visibility = ["//visibility:public"],
+    deps = ["//external:io_bazel_rules_scala/dependency/scala/parser_combinators"],
 )

scala/private/common_attributes.bzl

@@ -118,7 +118,7 @@ resolve_deps = {
     "_scala_toolchain": attr.label_list(
         default = [
             Label(
-                "//external:io_bazel_rules_scala/dependency/scala/scala_library",
+                "@io_bazel_rules_scala//scala/private/toolchain_deps:scala_library_classpath",
             ),
         ],
         allow_files = False,

scala/private/macros/scala_repositories.bzl

@@ -52,6 +52,69 @@ def _default_scala_extra_jars():
         },
     }
 
+def rules_scala_setup():
+    if not native.existing_rule("com_google_protobuf"):
+        http_archive(
+            name = "com_google_protobuf",
+            sha256 = "cf754718b0aa945b00550ed7962ddc167167bd922b842199eeb6505e6f344852",
+            strip_prefix = "protobuf-3.11.3",
+            urls = [
+                "https://mirror.bazel.build/github.com/protocolbuffers/protobuf/archive/v3.11.3.tar.gz",
+                "https://github.com/protocolbuffers/protobuf/archive/v3.11.3.tar.gz",
+            ],
+        )
+
+    native.bind(
+        name = "io_bazel_rules_scala/dependency/com_google_protobuf/protobuf_java",
+        actual = "@com_google_protobuf//:protobuf_java",
+    )
+
+    if not native.existing_rule("rules_cc"):
+        http_archive(
+            name = "rules_cc",
+            sha256 = "29daf0159f0cf552fcff60b49d8bcd4f08f08506d2da6e41b07058ec50cfeaec",
+            strip_prefix = "rules_cc-b7fe9697c0c76ab2fd431a891dbb9a6a32ed7c3e",
+            urls = ["https://github.com/bazelbuild/rules_cc/archive/b7fe9697c0c76ab2fd431a891dbb9a6a32ed7c3e.tar.gz"],
+        )
+
+    if not native.existing_rule("rules_java"):
+        http_archive(
+            name = "rules_java",
+            sha256 = "220b87d8cfabd22d1c6d8e3cdb4249abd4c93dcc152e0667db061fb1b957ee68",
+            urls = ["https://github.com/bazelbuild/rules_java/releases/download/0.1.1/rules_java-0.1.1.tar.gz"],
+        )
+
+    if not native.existing_rule("rules_proto"):
+        http_archive(
+            name = "rules_proto",
+            sha256 = "4d421d51f9ecfe9bf96ab23b55c6f2b809cbaf0eea24952683e397decfbd0dd0",
+            strip_prefix = "rules_proto-f6b8d89b90a7956f6782a4a3609b2f0eee3ce965",
+            urls = [
+                "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/f6b8d89b90a7956f6782a4a3609b2f0eee3ce965.tar.gz",
+                "https://github.com/bazelbuild/rules_proto/archive/f6b8d89b90a7956f6782a4a3609b2f0eee3ce965.tar.gz",
+            ],
+        )
+
+    if not native.existing_rule("rules_python"):
+        http_archive(
+            name = "rules_python",
+            sha256 = "e5470e92a18aa51830db99a4d9c492cc613761d5bdb7131c04bd92b9834380f6",
+            strip_prefix = "rules_python-4b84ad270387a7c439ebdccfd530e2339601ef27",
+            urls = ["https://github.com/bazelbuild/rules_python/archive/4b84ad270387a7c439ebdccfd530e2339601ef27.tar.gz"],
+        )
+
+    if not native.existing_rule("zlib"):  # needed by com_google_protobuf
+        http_archive(
+            name = "zlib",
+            build_file = "@com_google_protobuf//third_party:zlib.BUILD",
+            sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
+            strip_prefix = "zlib-1.2.11",
+            urls = [
+                "https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz",
+                "https://zlib.net/zlib-1.2.11.tar.gz",
+            ],
+        )
+
 def scala_repositories(
         scala_version_shas = (
             _default_scala_version(),
@@ -60,6 +123,8 @@ def scala_repositories(
         maven_servers = _default_maven_server_urls(),
         scala_extra_jars = _default_scala_extra_jars(),
         fetch_sources = False):
+    rules_scala_setup()
+
     (scala_version, scala_version_jar_shas) = scala_version_shas
     major_version = _extract_major_version(scala_version)
 
@@ -120,92 +185,6 @@ def scala_repositories(
         fetch_sources = fetch_sources,
     )
 
-    # used by ScalacProcessor
-    _scala_maven_import_external(
-        name = "scalac_rules_commons_io",
-        artifact = "commons-io:commons-io:2.6",
-        artifact_sha256 = "f877d304660ac2a142f3865badfc971dec7ed73c747c7f8d5d2f5139ca736513",
-        licenses = ["notice"],
-        server_urls = maven_servers,
-        fetch_sources = fetch_sources,
-    )
-
-    _scala_maven_import_external(
-        name = "io_bazel_rules_scala_guava",
-        artifact = "com.google.guava:guava:21.0",
-        artifact_sha256 = "972139718abc8a4893fa78cba8cf7b2c903f35c97aaf44fa3031b0669948b480",
-        licenses = ["notice"],
-        server_urls = maven_servers,
-        fetch_sources = fetch_sources,
-    )
-
-    if not native.existing_rule("com_google_protobuf"):
-        http_archive(
-            name = "com_google_protobuf",
-            sha256 = "cf754718b0aa945b00550ed7962ddc167167bd922b842199eeb6505e6f344852",
-            strip_prefix = "protobuf-3.11.3",
-            urls = [
-                "https://mirror.bazel.build/github.com/protocolbuffers/protobuf/archive/v3.11.3.tar.gz",
-                "https://github.com/protocolbuffers/protobuf/archive/v3.11.3.tar.gz",
-            ],
-        )
-
-    if not native.existing_rule("rules_cc"):
-        http_archive(
-            name = "rules_cc",
-            sha256 = "29daf0159f0cf552fcff60b49d8bcd4f08f08506d2da6e41b07058ec50cfeaec",
-            strip_prefix = "rules_cc-b7fe9697c0c76ab2fd431a891dbb9a6a32ed7c3e",
-            urls = ["https://github.com/bazelbuild/rules_cc/archive/b7fe9697c0c76ab2fd431a891dbb9a6a32ed7c3e.tar.gz"],
-        )
-
-    if not native.existing_rule("rules_java"):
-        http_archive(
-            name = "rules_java",
-            sha256 = "220b87d8cfabd22d1c6d8e3cdb4249abd4c93dcc152e0667db061fb1b957ee68",
-            urls = ["https://github.com/bazelbuild/rules_java/releases/download/0.1.1/rules_java-0.1.1.tar.gz"],
-        )
-
-    if not native.existing_rule("rules_proto"):
-        http_archive(
-            name = "rules_proto",
-            sha256 = "4d421d51f9ecfe9bf96ab23b55c6f2b809cbaf0eea24952683e397decfbd0dd0",
-            strip_prefix = "rules_proto-f6b8d89b90a7956f6782a4a3609b2f0eee3ce965",
-            urls = [
-                "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/f6b8d89b90a7956f6782a4a3609b2f0eee3ce965.tar.gz",
-                "https://github.com/bazelbuild/rules_proto/archive/f6b8d89b90a7956f6782a4a3609b2f0eee3ce965.tar.gz",
-            ],
-        )
-
-    if not native.existing_rule("rules_python"):
-        http_archive(
-            name = "rules_python",
-            sha256 = "e5470e92a18aa51830db99a4d9c492cc613761d5bdb7131c04bd92b9834380f6",
-            strip_prefix = "rules_python-4b84ad270387a7c439ebdccfd530e2339601ef27",
-            urls = ["https://github.com/bazelbuild/rules_python/archive/4b84ad270387a7c439ebdccfd530e2339601ef27.tar.gz"],
-        )
-
-    if not native.existing_rule("zlib"):  # needed by com_google_protobuf
-        http_archive(
-            name = "zlib",
-            build_file = "@com_google_protobuf//third_party:zlib.BUILD",
-            sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
-            strip_prefix = "zlib-1.2.11",
-            urls = [
-                "https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz",
-                "https://zlib.net/zlib-1.2.11.tar.gz",
-            ],
-        )
-
-    native.bind(
-        name = "io_bazel_rules_scala/dependency/com_google_protobuf/protobuf_java",
-        actual = "@com_google_protobuf//:protobuf_java",
-    )
-
-    native.bind(
-        name = "io_bazel_rules_scala/dependency/commons_io/commons_io",
-        actual = "@scalac_rules_commons_io//jar",
-    )
-
     native.bind(
         name = "io_bazel_rules_scala/dependency/scalatest/scalatest",
         actual = "@io_bazel_rules_scala//scala/scalatest:scalatest",
@@ -236,11 +215,6 @@ def scala_repositories(
         actual = "@io_bazel_rules_scala_scala_parser_combinators",
     )
 
-    native.bind(
-        name = "io_bazel_rules_scala/dependency/scala/guava",
-        actual = "@io_bazel_rules_scala_guava",
-    )
-
     native.bind(
         name = "io_bazel_rules_scala/dependency/scala/scalatest/scalatest",
         actual = "@io_bazel_rules_scala_scalatest",

scala/private/phases/phase_scalac_provider.bzl

@@ -7,6 +7,20 @@ load(
     "@io_bazel_rules_scala//scala:providers.bzl",
     _ScalacProvider = "ScalacProvider",
 )
+load(
+    "@io_bazel_rules_scala//scala/private/toolchain_deps:toolchain_deps.bzl",
+    "find_deps_info_on",
+)
 
 def phase_scalac_provider(ctx, p):
-    return ctx.toolchains["@io_bazel_rules_scala//scala:toolchain_type"].scalac_provider_attr[_ScalacProvider]
+    toolchain_type_label = "@io_bazel_rules_scala//scala:toolchain_type"
+
+    library_classpath = find_deps_info_on(ctx, toolchain_type_label, "scala_library_classpath").deps
+    compile_classpath = find_deps_info_on(ctx, toolchain_type_label, "scala_compile_classpath").deps
+    macro_classpath = find_deps_info_on(ctx, toolchain_type_label, "scala_macro_classpath").deps
+
+    return _ScalacProvider(
+        default_classpath = library_classpath,
+        default_repl_classpath = compile_classpath,
+        default_macro_classpath = macro_classpath,
+    )

scala/private/rules/scala_junit_test.bzl

@@ -91,7 +91,7 @@ _junit_resolve_deps = {
     "_scala_toolchain": attr.label_list(
         default = [
             Label(
-                "//external:io_bazel_rules_scala/dependency/scala/scala_library",
+                "@io_bazel_rules_scala//scala/private/toolchain_deps:scala_library_classpath",
             ),
             Label("//external:io_bazel_rules_scala/dependency/junit/junit"),
             Label(