Define a target for scala_parser.

[ci skip-rust]

[ci skip-build-wheels]

3rdparty/jvm/io/circe/BUILD

@@ -0,0 +1,6 @@
+jvm_artifact(
+    name="circe-generic",
+    group="io.circe",
+    artifact="circe-generic_2.13",
+    version="0.14.1",
+)

3rdparty/jvm/org/scalameta/BUILD

@@ -0,0 +1,7 @@
+jvm_artifact(
+    name="scalameta",
+    group="org.scalameta",
+    artifact="scalameta_2.13",
+    version="4.4.30",
+    packages=["scala.meta.**"],
+)

pants.toml

@@ -164,6 +164,8 @@ jvm_testprojects = "3rdparty/jvm/testprojects.lockfile"
 # A resolve for the java_parser, which is shipped with Pants, and invoked with its own isolated
 # classpath. Consequently, we isolate it to its own lockfile.
 java_parser = "src/python/pants/backend/java/dependency_inference/java_parser.lockfile"
+# Has the same isolation requirements as `java_parser`.
+scala_parser = "src/python/pants/backend/scala/dependency_inference/scala_parser.lockfile"
 
 [toolchain-setup]
 repo = "pants"

src/python/pants/backend/scala/dependency_inference/BUILD

@@ -1,7 +1,13 @@
 # Copyright 2021 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-python_sources(dependencies=[":scala_sources"])
+python_sources(dependencies=[":scala_resources"])
+resources(name="scala_resources", sources=["*.scala", "scala_parser.lockfile"])
+
 python_tests(name="tests", timeout=240)
 
-resources(name="scala_sources", sources=["*.scala"])
+# Targets for developing on the Scala parser outside of engine rules.
+scala_sources(
+    name="scala_parser",
+    compatible_resolves=["scala_parser"],
+)

src/python/pants/backend/scala/dependency_inference/ScalaParser.scala

@@ -1,3 +1,9 @@
+/**
+ * TODO: The dependencies of this class are defined in two places:
+ *   1. `3rdparty/jvm` via import inference.
+ *   2. `SCALA_PARSER_ARTIFACT_REQUIREMENTS`.
+ * See https://github.com/pantsbuild/pants/issues/13754.
+ */
 package org.pantsbuild.backend.scala.dependency_inference
 
 import io.circe._