ACOMMONS-243 chore: Improve repository setup and agent instructions

.devcontainer/Dockerfile

@@ -0,0 +1,4 @@
+FROM maven:3-eclipse-temurin-21
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends python3 git \
+    && rm -rf /var/lib/apt/lists/*

.devcontainer/devcontainer.json

@@ -0,0 +1,6 @@
+{
+  "name": "Analyzer commons (JDK 21, Maven 3)",
+  "build": {"dockerfile": "Dockerfile"},
+  "postCreateCommand": "python3 scripts/dev.py doctor --resolve",
+  "remoteUser": "root"
+}

.editorconfig

@@ -0,0 +1,23 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.py]
+indent_size = 4
+
+# Test resources can contain intentional whitespace and invalid source.
+[{*.py,*.yml,*.yaml,*.md}]
+trim_trailing_whitespace = true
+
+[**/src/test/resources/**]
+charset = unset
+end_of_line = unset
+insert_final_newline = unset
+indent_style = unset
+indent_size = unset
+trim_trailing_whitespace = false

.githooks/pre-commit

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec python3 scripts/dev.py check --base HEAD

.github/copilot-instructions.md

@@ -0,0 +1,2 @@
+Read [AGENTS.md](../AGENTS.md) before work. Follow the relevant module's
+`AGENTS.md` for its code paths, test conventions, and generated data.

.github/workflows/agent-readiness.yml

@@ -0,0 +1,46 @@
+name: Repository checks
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, edited, labeled, unlabeled]
+  push:
+    branches: [master, 'branch-*']
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  local-checks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
+      - name: Check source boundaries, added credentials, and tooling tests
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha || github.event.before || github.sha }}
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          ALLOW_LARGE: ${{ contains(github.event.pull_request.labels.*.name, 'large-change-reviewed') }}
+        run: |
+          if ! git cat-file -e "$BASE_SHA^{commit}" 2>/dev/null; then
+            BASE_SHA="$(git rev-list --max-parents=0 HEAD | head -n 1)"
+          fi
+          python3 scripts/dev.py check --base "$BASE_SHA"
+          if [ -n "$PR_TITLE" ]; then
+            if [ "$ALLOW_LARGE" = true ]; then
+              python3 scripts/repository_checks.py --base "$BASE_SHA" --title "$PR_TITLE" --allow-large
+            else
+              python3 scripts/repository_checks.py --base "$BASE_SHA" --title "$PR_TITLE"
+            fi
+          fi
+
+  dependency-review:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - name: Reject new high and critical dependency advisories
+        uses: actions/dependency-review-action@v5
+        with:
+          fail-on-severity: high

.github/workflows/build.yml

@@ -52,6 +52,9 @@ jobs:
           sonar-platform: none
           maven-args: -Pcoverage
 
+      - name: Generate dependency SBOM
+        run: mvn -B -ntp -C org.cyclonedx:cyclonedx-maven-plugin:makeAggregateBom
+
       - name: Upload Maven build as pipeline artifact
         uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:

.gitignore

@@ -33,3 +33,7 @@ Desktop.ini
 
 # ---- Claude Code
 .mcp.json
+
+# Python command-tool bytecode
+__pycache__/
+*.pyc

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+  "recommendations": [
+    "editorconfig.editorconfig",
+    "sonarsource.sonarlint-vscode"
+  ]
+}

AGENTS.md

@@ -0,0 +1,152 @@
+# Work in this repository
+
+This repository contains eight shared Java libraries. It does not contain a
+standalone analyzer or a SonarQube server. Start with the module table in
+[README.md](README.md). Read only the module instructions that apply to the task.
+
+## Prepare and check
+
+Use Python 3.9 or later, Git, JDK 21 or later, and Maven 3.9 or later.
+`mise.toml` selects the existing Java 21.0 and Maven 3.9 release lines. From the
+repository root, run:
+
+```sh
+mise trust
+mise install
+python3 scripts/dev.py doctor --resolve
+python3 scripts/dev.py test recognizers
+```
+
+`doctor` checks the JVM used by Maven. That JVM can differ from `java` on PATH.
+The parent POM is `org.sonarsource.parent:parent`. Local tests do not require
+Vault, a SonarQube server, npm, NuGet, or publishing credentials. If an artifact
+returns HTTP 401 or 403, check your Maven mirror and server settings. Keep those
+settings outside Git. Do not print tokens or copy CI deployer credentials.
+The optional `.devcontainer` uses the Maven 3 image with JDK 21. It installs Git
+and Python from Debian packages. The image and packages can receive updates.
+
+## Select work and tests
+
+```sh
+python3 scripts/dev.py affected origin/master
+python3 scripts/dev.py test commons --test TokenLocationTest
+python3 scripts/dev.py test regex-parsing --test EmptyGroupFinderTest
+python3 scripts/dev.py repeat recognizers --test CodeRecognizerTest
+python3 scripts/dev.py verify
+python3 scripts/dev.py build
+python3 scripts/dev.py sbom
+python3 scripts/dev.py reproduce recognizers
+python3 scripts/dev.py quality recognizers
+```
+
+`affected` includes local edits and reverse dependencies, including test
+dependencies. It gives a conservative module list. It cannot identify external
+analyzer consumers. Module names are directory names. The Maven commands include
+`-pl` and `-am` for selected modules. A class selector uses
+`-Dsurefire.failIfNoSpecifiedTests=false` so upstream modules can have no matching
+class. Always run the module suite after a focused test.
+The tool also requires a fresh report with executed tests in the selected
+module. A misspelled class or method fails instead of passing silently.
+
+`test` runs unit tests. `verify` also runs the offline repository checks and
+Maven verification, including the existing JAR size limits. `build` installs
+artifacts in the local Maven cache. None of these commands deploys artifacts.
+They keep `target/` for incremental builds. Use `mvn clean` only when stale
+outputs are a possible cause. Cold dependency downloads take longer than a warm
+build. No fixed build duration is guaranteed.
+
+`sbom` records the resolved dependency graph in CycloneDX files under `target/`.
+CI retains these files with the build output. Maven uses strict checksum checks,
+but this is not a content lock for every transitive artifact. Dependency review
+rejects new high and critical advisories when GitHub dependency review is enabled.
+`reproduce` makes two clean packages of one module and compares their bytes. It
+uses the commit time for archive timestamps and the inherited `Build-Time`
+manifest field. It skips tests, so run tests separately first. A local match does
+not guarantee that signing or publishing produces identical bytes.
+
+The command writes its duration, exit status, and command to `target/agent/`.
+It fails if Maven changes a tracked file. Read the first Maven `ERROR` and the
+module's `target/surefire-reports/` after a test failure. Preserve the failing
+sample, exact command, JDK, and revision. Do not rerun until green without
+recording and correcting the cause. `repeat` runs a selected suite twice and
+stops at the first failure. It is a local flake check, not proof of determinism.
+
+## Follow the source contracts
+
+Use two spaces in Java and XML, and four spaces in Python. Use the existing
+package names and `*Test` class names. Keep imports explicit. Match package
+directories. `scripts/dev.py check` rejects reactor cycles, undeclared local
+source imports, package-directory errors, and added whitespace errors. It also
+runs the command-tool tests. `.editorconfig` gives editor defaults. Test resources
+can contain deliberate invalid source and whitespace; do not format them.
+Use `check --base <ref>` to include committed changes in whitespace and
+credential checks. CI supplies the PR base explicitly. With no base, the tool
+checks local changes from `HEAD`.
+To run these fast checks before a commit, opt in with
+`git config --local core.hooksPath .githooks`. This is a repository-local setting;
+the setup command does not change global Git configuration. The same checks run
+in CI even when the local hook is not enabled.
+
+New public APIs affect many analyzers. Prefer the existing API and a small
+implementation change. Keep `internal` implementation classes behind their
+public entry points. Preserve package null contracts from `package-info.java`.
+Do not add a dependency to a shared library without checking its consumers and
+JAR size. Compiler checks and tests check types; NEXT analysis supplies broader
+null, dead-code, duplication, and size feedback. Do not claim that the local
+checks replace this analysis.
+
+`quality` produces local PMD and duplicate-code reports under each selected
+module's `target/site/`. It supplies feedback for unused private code, class
+names, large classes/methods, and duplicated token blocks. These reports are
+not a new merge gate, and they do not prove null safety or API compatibility.
+The VS Code extension recommendations enable EditorConfig and SonarQube for IDE
+when installed. CI's `coverage` profile also checks a 60% line-coverage floor in
+each module with measured code. A coverage floor does not prove that assertions
+are useful; keep behavior assertions and counterexamples in the tests.
+
+Start a new Java test from a small adjacent test. `CodeRecognizerTest` is a
+simple JUnit 4 example. `EmptyGroupFinderTest` and its YAML file show the regex
+finder pattern. Some modules use JUnit 4 and others use JUnit Jupiter; preserve
+the module's dependency choice. Include a positive case, a negative case, and
+relevant boundaries. Assert actual output and locations. Do not weaken expected
+results to obtain a passing test. No generated test scaffold is required.
+
+## Keep changes bounded
+
+Work on a side branch. Use `fix/`, `feat/`, or `chore/` with a short description.
+Use an `ACOMMONS-<number>` prefix in the commit and PR title when a ticket exists;
+otherwise use a conventional title such as `chore: Improve local checks`.
+Separate behavior changes from broad formatting or dependency updates. Keep
+each PR small enough to explain and test. The readiness workflow checks the
+title and reports changed line counts. Its size limit requires a maintainer's
+`large-change-reviewed` label for an exceptional PR.
+
+Before completion, run the affected module suites, `python3 scripts/dev.py
+verify`, and inspect the full diff. Required CI and NEXT checks must pass before
+merge. A local pass does not establish downstream compatibility or a green CI
+result. If an API or common parser changes, identify affected consumers in the
+PR. Do not merge, tag, sign, release, promote, publish, or force-push unless the
+user explicitly requests that operation. CI performs those operations under its
+own permissions. Never use release credentials for local tests.
+
+## Edit the source of generated data
+
+Do not commit `target/`, `dependency-reduced-pom.xml`, generated configuration
+JSON, or generated npm/NuGet archives. Configuration JSON comes from
+`SecretClassifier` and the exporter classes. Change those sources, then run
+configuration-module tests and package verification. Packaging templates under
+`sonar-analyzer-commons-configurations/src/main/packaging/` are source files;
+their filtered copies under `target/packaging/` are generated.
+
+The verifier corpus under `test-commons/src/test/resources/`, and regex finder
+YAML files, are deliberate test data. Edit them only to test a stated behavior.
+Rule JSON and HTML under `commons/src/test/resources/` are loader test fixtures,
+not production rule descriptions. Do not regenerate all expected data for an
+unrelated change. Marketing owns the marked root README section and logo URLs.
+
+Use network access for required dependency resolution and source references.
+Do not send repository source, test corpora, credentials, or build logs to an
+external service unless the task authorizes that service. Repository checks
+scan added lines for selected credential formats; they cannot detect every
+secret. Stop and remove a real credential if one is found, then follow the
+organization's credential-rotation process.

CLAUDE.md

@@ -0,0 +1 @@
+@AGENTS.md

README.md

@@ -22,16 +22,33 @@ To learn more about the SonarQube product family, visit the [Sonar website](http
 ## Modules
 
 * [commons](commons) Logic useful for a language plugin
+* [sonar-analyzer-commons-configurations](sonar-analyzer-commons-configurations) JSON, npm, and NuGet exports of shared configuration
 * [recognizers](recognizers) Logic useful for detecting commented out code
 * [test-commons](test-commons) Logic useful to test a language analyzer
 * [xml-parsing](xml-parsing) Logic useful to analyze and test checks for XML file
 * [test-xml-parsing](test-xml-parsing) Logic useful to test XML parsing and XML-related rules
-* [regex-parsing](regex-parsing) Logic used to parse regular expressions (currently only for Java)
+* [regex-parsing](regex-parsing) Regular-expression parsing and shared checks, with Java, PHP, and Python source adapters
+* [performance-measure](performance-measure) Nested duration measurements and report merging
 
 ## Build
+Use JDK 21 or later and Maven 3.9 or later. [mise.toml](mise.toml) selects the
+existing Java 21.0 and Maven 3.9 release lines.
+Python 3.9 or later runs the local command tool.
+
+```sh
+mise trust
+mise install
+python3 scripts/dev.py doctor --resolve
+python3 scripts/dev.py verify
 ```
-mvn clean install
-```
+
+For a quick module test, run `python3 scripts/dev.py test recognizers`.
+For a full local install, run `python3 scripts/dev.py build`.
+These commands retain build outputs for incremental work and never publish.
+See [AGENTS.md](AGENTS.md) for module selection, failure diagnosis, source
+boundaries, and contribution rules. The optional [.devcontainer](.devcontainer)
+contains a development environment. CI signing and publishing require internal
+services; local unit tests do not require them.
 
 ### License
 Copyright 2009-2023 SonarSource.

commons/AGENTS.md

@@ -0,0 +1,23 @@
+# Common analyzer utilities
+
+Production code is under `src/main/java/org/sonarsource/analyzer/commons/`.
+Tests mirror that package under `src/test/java/`. Start with `TokenLocation`
+and `TokenLocationTest` for a small utility and its output assertions.
+
+`RuleMetadataLoader` combines annotations with JSON/HTML rule resources.
+`BuiltInQualityProfileJsonLoader` loads profile definitions. Their test resources
+contain deliberately invalid and historical data. Change a resource only when
+the loader behavior under test requires it.
+
+`appsec/` contains IP, protocol, key-size, test-file, and secret classification.
+Secret configuration exports consume `SecretClassifier` from the configurations
+module. A classifier change therefore requires both module suites and a package
+verification. `collections/` contains persistent collection helpers. Preserve
+their immutability and iterator contracts.
+
+The POM relocates `org.json.simple` into an internal namespace during shading.
+Do not expose that shaded package in a public API. `verify` checks the existing
+JAR size limit. New dependencies increase the size of many analyzers.
+
+From the root, run `python3 scripts/dev.py test commons`. A change to a public
+utility also needs a check of affected analyzer callers outside this repository.

commons/README.md

@@ -1,7 +1,11 @@
-SonarSource Analyzers Commons (compatible with SQ >=7.9)
+SonarSource Analyzers Commons
 =========================
 Logic useful for an average language plugin
 
+The plugin API version is set in the root POM. Check an analyzer's supported
+SonarQube versions before updating this dependency. See [AGENTS.md](AGENTS.md)
+for source locations and tests.
+
 * [`RuleMetadataLoader`](./src/main/java/org/sonarsource/analyzer/commons/RuleMetadataLoader.java) - to define rules metadata based on `json` and `html` files, or, when constructed without a resource folder, directly from the `org.sonar.check.Rule` annotation
 * [`DeprecatedRuleKey`](./src/main/java/org/sonarsource/analyzer/commons/annotations/DeprecatedRuleKey.java) annotation - when used with [`RuleMetadataLoader`](./src/main/java/org/sonarsource/analyzer/commons/RuleMetadataLoader.java) in will add deprecated rule key for an annotated rule
 * [`BuiltInQualityProfileJsonLoader`](./src/main/java/org/sonarsource/analyzer/commons/BuiltInQualityProfileJsonLoader.java) - to define default rules profiles based on `json` file

config/pmd.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="Local source feedback"
+         xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
+  <description>Local feedback for unused code, naming, and source reading size.</description>
+  <rule ref="category/java/bestpractices.xml/UnusedPrivateMethod"/>
+  <rule ref="category/java/bestpractices.xml/UnusedPrivateField"/>
+  <rule ref="category/java/bestpractices.xml/UnusedLocalVariable"/>
+  <rule ref="category/java/codestyle.xml/ClassNamingConventions"/>
+  <rule ref="category/java/design.xml/NcssCount">
+    <properties>
+      <property name="classReportLevel" value="1000"/>
+      <property name="methodReportLevel" value="100"/>
+    </properties>
+  </rule>
+</ruleset>

performance-measure/AGENTS.md

@@ -0,0 +1,13 @@
+# Performance measurements
+
+`PerformanceMeasure` starts and stops nested duration measurements.
+`DurationMeasure` stores the hierarchy. `DurationMeasureFiles` reads and writes
+reports. `DurationMeasureMerger` combines measurements. `log/` adapts logging.
+The README shows the sensor and report flow.
+
+Preserve disabled-mode behavior, nesting, thread behavior, and report format.
+Do not make correctness tests depend on a fixed wall-clock duration. Use the
+adjacent measurement and merger tests for the behavior under change.
+
+Run `python3 scripts/dev.py test performance-measure` from the root. No running
+SonarQube service is needed for these unit tests.