ADFA-4436 Add RainbowOnTheGo plugin (depth-colored brackets)#32
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A plugin that colors matching parentheses, brackets, and braces by nesting depth. It implements the generic EditorDecorationProvider API: its decorate() method scans a region of editor text for brackets, tracks nesting depth, skips brackets inside strings/comments, and returns six-color day/night spans. The Code On The Go editor merges those spans on top of normal highlighting — all of the rainbow logic lives in the plugin; the IDE knows nothing about brackets. Mirrors the random-xkcd template: build.gradle.kts/settings.gradle.kts, AndroidManifest plugin.* metadata, DocumentationExtension tooltip + Tier-3 in-IDE help, and a top-level documentation HTML. Adds an Examples table row. No UI, no permissions, no network. Requires a Code On The Go build that includes the EditorDecorationProvider API (IDE-side support in ADFA-4436).
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added 2 commits
June 26, 2026 12:17
…version - Add rainbow-on-the-go to the deploy MAP in update-libs.yml so its .cgp ships to the plugins website (auto-discovered by build-plugins.yml). - Set plugin.min_ide_version to 26.27 (when the new plugin API ships). - Correct CLAUDE.md: new plugins only need the update-libs.yml MAP; build-plugins.yml auto-discovers.
- Collapse the prefix-recovery and emitting scans into one shared lexer so they can't diverge; apply the newline reset uniformly (a // comment or string no longer suppresses coloring for the rest of a multi-line region). - Restrict coloring to Java/Kotlin via FileOpenExtension (observe-only; canHandleFileOpen=false). Gate defaults off, so other languages are never colored. Drop the #-as-comment rule (wrong for Java/Kotlin). - Add a per-document checkpoint cache so decorate() resumes prefix lexing from the nearest cached offset instead of rescanning [0,start) every call, turning sequential decoration from ~O(N^2) into ~O(N). - Update manifest/docs to say Java/Kotlin only and reflect file-open observation (reads no file contents).
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Summary
Adds RainbowOnTheGo, a plugin that colors matching parentheses, brackets, and braces by nesting depth (red → orange → yellow → green → blue → purple), with separate palettes for the light and dark editor themes.
It implements the generic
EditorDecorationProviderAPI. Itsdecorate(text, start, end, isDark)method does everything itself — scans the text for brackets, tracks nesting depth (skipping strings/comments), and returns foreground-color spans — and the Code On The Go editor merges them on top of the normal highlighting. The IDE has no knowledge of brackets, depth, or palettes; all of that lives in the plugin.What it contains
RainbowOnTheGoPlugin—IPlugin+EditorDecorationProvider+DocumentationExtension(Tier 1/2 tooltip + Tier 3 offline help underassets/docs/).random-xkcd:build.gradle.kts/settings.gradle.kts,AndroidManifest.xmlplugin.*metadata, top-levelrainbow-on-the-go-documentation.html.Verification
./gradlew assemblePlugin→rainbow-on-the-go.cgpbuilds clean.(),[],{}in Java; nesting depth carried across lines; brackets in strings/comments excluded; day and night palettes; live theme toggle; revert-on-disable.Dependency
Requires a Code On The Go build that includes the
EditorDecorationProviderAPI (IDE-side support in ADFA-4436, appdevforall/CodeOnTheGo#1448). The plugin compiles against the refreshedplugin-api.jar.min_ide_versionis currently a placeholder (1.0.0) and should be bumped to the first release that ships the API once that PR lands.(Reworked from an earlier palette-only
BracketColorExtensionplugin after review feedback: the IDE-side API is now generic and all rainbow logic lives in the plugin.)