Skip a SourceFileSet that belongs to another language

[alexander-yevsyukov]

Fixes #17.

Problem

Renderer.renderSources() filtered the given SourceFileSet to the files written in the renderer's language, but still invoked the abstract render() when that filtered subset was empty because the set belonged to another language.

Source and target roots are language-specific directories (.../main/java, .../main/kotlin, …), and every renderer is invoked on every source set. So with Kotlin enabled, a Java renderer received the Kotlin-only set (rooted under .../main/kotlin) and crashed while looking up a .java file there:

java.lang.IllegalArgumentException: File not found: `io/spine/tools/compiler/test/ProjectId.java`.
  Input root:  .../consumer/build/generated/sources/proto/main/kotlin
  at io.spine.tools.compiler.render.SourceFileSet.file(SourceFileSet.kt)
  at io.spine.tools.compiler.test.uuid.UuidJavaRenderer.render(UuidJavaRenderer.java)
  at io.spine.tools.compiler.render.Renderer.renderSources(Renderer.kt)

Fix

Skip rendering when the set has files but none match the renderer's language:

val belongsToAnotherLanguage = relevantFiles.isEmpty && !sources.isEmpty
if (belongsToAnotherLanguage) return

The !sources.isEmpty half is the key distinction from a naive relevantFiles.isEmpty() guard (which broke PipelineSpec): a truly empty set is still passed to render(), so renderers that create files from scratch (e.g. InternalAccessRenderer) keep working.

UuidJavaRenderer keeps its per-file findFile(...) guard: select(UuidType.class) returns UUID types from every source root, so when a Java-producing root other than java is present (e.g. grpc), the renderer must still skip types whose .java file is absent from the current set. (An earlier revision of this PR removed that guard; review correctly flagged it is still needed, so it is retained — only its comment is clarified.)

Changes

• Renderer.renderSources() — the language guard + doc.
• RendererSpec — 3 regression tests: skip on another language, render on matching language, render on an empty set.
• UuidJavaRenderer — retains the per-file findFile(...) guard for multi-root safety (net change vs master is a clearer comment).
• version.gradle.kts — 2.0.0-SNAPSHOT.057 → .058 (version gate), as its own commit.

Verification

• RendererSpec 6/6, PipelineSpec 17/17, plus cli / jvm / api-tests.
• Clean integrationTest --no-build-cache: BUILD SUCCESSFUL — the Kotlin-enabled consumer / in-place-consumer now resolve the fixed compiler-cli-all:…058 and generate code without the crash and without the workaround.

Notes for the reviewer

• The version bump is a separate commit (Bump version -> `2.0.0-SNAPSHOT.058`), and the regenerated docs/dependencies/ reports are committed on their own (Update dependency reports).
• The third commit adds a team-memory note under .agents/memory/ about a build gotcha encountered here: after a version bump, an incremental integrationTest can launch the previous compiler because the plugin's embedded version resource isn't regenerated — verify with a clean build. It is intentionally a standalone commit so it can be reviewed (or dropped) independently of the fix.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes a crash that occurred when a renderer was invoked with a SourceFileSet rooted in another language’s directory (e.g., Java renderer receiving a Kotlin-only set), by skipping rendering for non-empty sets that contain no files matching the renderer’s language, while still allowing truly empty sets to be rendered for “create-from-scratch” renderers.

Changes:

• Updated Renderer.renderSources() to skip non-empty source sets that contain no files in the renderer’s language (but still render truly empty sets).
• Added regression tests in RendererSpec covering: matching-language rendering, other-language skipping, and empty-set rendering.
• Removed the temporary per-file workaround from UuidJavaRenderer now that Renderer.renderSources() properly guards the call.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
api/src/main/kotlin/io/spine/tools/compiler/render/Renderer.kt	Adds a language-aware guard to skip rendering for non-empty sets that belong to another language; updates KDoc accordingly.
api/src/test/kotlin/io/spine/tools/compiler/render/RendererSpec.kt	Adds regression tests for rendering/skip behavior across matching language, other language, and empty sets.
tests/compiler-extension/src/main/java/io/spine/tools/compiler/test/uuid/UuidJavaRenderer.java	Removes the workaround that previously avoided failing on mismatched-language source roots.
version.gradle.kts	Bumps snapshot version from .057 to .058 for publishing / version gating.
docs/dependencies/pom.xml	Updates the dependency-report POM version to match the bumped snapshot.
docs/dependencies/dependencies.md	Regenerates dependency report content for the bumped snapshot version.
.agents/memory/project/integration-tests-stale-compiler-after-version-bump.md	Skipped (config-managed .agents/** file per repo review rules).
.agents/memory/MEMORY.md	Skipped (config-managed .agents/** file per repo review rules).

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.62%. Comparing base (040ec9e) to head (ab70f14).

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #77      +/-   ##
============================================
+ Coverage     75.60%   75.62%   +0.01%     
  Complexity      677      677              
============================================
  Files           203      203              
  Lines          3947     3950       +3     
  Branches        390      392       +2     
============================================
+ Hits           2984     2987       +3     
  Misses          845      845              
  Partials        118      118              

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