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feat(c4-beta): auto-generated legend (legend off opt-out) - #7869
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## develop #7869 +/- ##
===========================================
+ Coverage 80.73% 81.47% +0.74%
===========================================
Files 619 632 +13
Lines 84970 86802 +1832
Branches 18596 19315 +719
===========================================
+ Hits 68601 70723 +2122
+ Misses 15350 15072 -278
+ Partials 1019 1007 -12
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Rebased onto the refreshed #7868, which is itself now on current Only this PR's own commit was replayed, and it needed no conflict resolution. The two changes it inherits from below:
c4-beta unit tests pass and Still an RFC prototype for #7844 rather than a merge candidate. |
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Included review availability: Your plan provides up to 10 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughChangesThe PR adds the experimental C4 beta diagram
Dagre cluster label spacing
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Source
participant C4LangiumParser
participant C4Parser
participant C4BetaDB
participant C4Renderer
Source->>C4LangiumParser: parse c4-beta source
C4LangiumParser-->>C4Parser: return C4 AST
C4Parser->>C4BetaDB: populate model data
C4BetaDB-->>C4Renderer: provide nodes, edges, and legend items
C4Renderer-->>Source: render SVG diagram
Merge Risk: ⚪ Minimal · up to The previously identified layout, styling, and documentation issues are addressed in the current implementation, with no actionable risk remaining from this incremental test change. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Force-pushed to remove This was raised in review on #7859, citing the project's own rule against tagging commits as AI-authored. Since this repo merges rather than squashes, every commit message lands on Done with The five Sorry for the CI noise on a draft. @sidharthv96 - this is the batch you asked us not to make a habit of; it is one pass to clear a blocking review point across the stack, not a sweep to chase |
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In `@packages/mermaid/src/diagrams/c4-beta/db.ts`:
- Around line 271-273: Update the boundary-node rendering branch that sets
cssClasses and cssStyles so applicable element tags are processed before the
boundary is emitted. Preserve the existing c4-boundary and deploymentNode
classes, add c4-external and c4-tag-* classes, and include supported tag color
styles in cssStyles; if boundary tags cannot be supported, reject them with a
clear warning instead.
In `@packages/mermaid/src/docs/syntax/c4-beta.md`:
- Line 270: Replace system with softwareSystem in the legend-off example at
packages/mermaid/src/docs/syntax/c4-beta.md lines 270-270, then regenerate
docs/syntax/c4-beta.md so the corresponding generated example at lines 444-444
reflects the canonical source change.
In `@packages/mermaid/src/rendering-util/layout-algorithms/dagre/index.js`:
- Line 515: Update applyDagreLayoutResult so each edge route and edge label
receives the same cumulative ancestor reserve used by normalizeDagreNode,
calculated for its applicable shared ancestor rather than as a single global
offset. Preserve the existing subGraphTitleTotalMargin adjustment while applying
the per-edge reserve consistently to all route points and labels.
After applying the fix, consider running `coderabbit review --agent` for local
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.changeset/c4-beta-diagram.md.changeset/c4-beta-legend.md.changeset/c4-beta-theme-vars.md.changeset/dagre-cluster-label-reserve.md.cspell/code-terms.txt.cspell/libraries.txt.cspell/misc-terms.txtdemos/c4-beta.htmldemos/index.htmldocs/syntax/c4-beta.mde2e/diagrams/flowchart/should-keep-a-nested-subgraph-title-clear-of-its-children-large-margin.mmde2e/diagrams/flowchart/should-keep-a-nested-subgraph-title-clear-of-its-children-small-margin.mmde2e/platform/c4-beta-proof.htmle2e/rendering/c4-beta/c4-beta.spec.jspackages/examples/src/examples/c4-beta.tspackages/examples/src/index.tspackages/mermaid/src/diagram-api/diagram-beta-policy.spec.tspackages/mermaid/src/diagram-api/diagram-orchestration.tspackages/mermaid/src/diagrams/c4-beta/db.spec.tspackages/mermaid/src/diagrams/c4-beta/db.tspackages/mermaid/src/diagrams/c4-beta/detector.tspackages/mermaid/src/diagrams/c4-beta/diagram.tspackages/mermaid/src/diagrams/c4-beta/parser.tspackages/mermaid/src/diagrams/c4-beta/renderer.spec.tspackages/mermaid/src/diagrams/c4-beta/renderer.tspackages/mermaid/src/diagrams/c4-beta/styles.tspackages/mermaid/src/diagrams/c4-beta/types.tspackages/mermaid/src/docs/.vitepress/config.tspackages/mermaid/src/docs/syntax/c4-beta.mdpackages/mermaid/src/rendering-util/layout-algorithms/dagre/index.jspackages/mermaid/src/rendering-util/layout-algorithms/dagre/index.spec.jspackages/mermaid/src/rendering-util/multi-diagram-id-uniqueness.spec.tspackages/mermaid/src/themes/theme-base.jspackages/mermaid/src/themes/theme-dark.jspackages/mermaid/src/themes/theme-default.jspackages/mermaid/src/themes/theme-forest.jspackages/mermaid/src/themes/theme-neo-dark.jspackages/mermaid/src/themes/theme-neo.jspackages/mermaid/src/themes/theme-neutral.jspackages/mermaid/src/themes/theme-redux-color.jspackages/mermaid/src/themes/theme-redux-dark-color.jspackages/mermaid/src/themes/theme-redux-dark.jspackages/mermaid/src/themes/theme-redux.jspackages/parser/langium-config.jsonpackages/parser/src/language/c4/c4.langiumpackages/parser/src/language/c4/index.tspackages/parser/src/language/c4/module.tspackages/parser/src/language/c4/tokenBuilder.tspackages/parser/src/language/c4/valueConverter.tspackages/parser/src/language/index.tspackages/parser/src/parse.tspackages/parser/tests/c4.test.ts
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In `@packages/mermaid/src/rendering-util/layout-algorithms/dagre/index.js`:
- Around line 605-606: The merged self-loop route in
applyDagreLayoutResult/getEdgesToRender is receiving cumulative ancestor reserve
twice. Mark that generated route and call normalizeDagreEdge with zero endpoint
reserves while preserving edgeOffsetY, then add a nested self-loop regression
test confirming the loop attaches to its node.
- Around line 544-548: Update normalizeDagreEdge so edge.x and edge.y are
shifted by the reserve at the label’s position, matching the normalized
edge.points route. Preserve the existing subGraphTitleTotalMargin handling and
leave non-label edge normalization unchanged.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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docs/syntax/c4-beta.mde2e/platform/c4-beta-proof.htmlpackages/mermaid/src/diagrams/c4-beta/detector.spec.tspackages/mermaid/src/diagrams/c4-beta/detector.tspackages/mermaid/src/diagrams/c4-beta/styles.tspackages/mermaid/src/docs/syntax/c4-beta.mdpackages/mermaid/src/rendering-util/layout-algorithms/dagre/index.jspackages/mermaid/src/rendering-util/layout-algorithms/dagre/index.spec.js
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A subgraph title is drawn above its children, and the space for it was reserved one level up only. A title in a nested subgraph therefore overlapped the children of the subgraph it sat in, and the deeper the nesting the worse it got. Every ancestor's reserve now accumulates, so a title always has its own band whatever the depth, with e2e coverage at two margin sizes. Edges move with their endpoints: each route point and label shifts by the reserve of the clusters around the ends it connects, and a merged self-loop, whose points are already placed, is not shifted a second time. The overlap was most visible in C4 diagrams, where every boundary is a cluster.
A Langium grammar for the `c4-beta` syntax proposed in the RFC: the four diagram kinds, the element keywords with their optional description and technology, the nesting that expresses containment, relationships with an optional technology, dynamic step numbers, tags and style statements. The token builder keeps element keywords usable as identifiers, so a diagram can name a node `container` without the grammar taking it for the keyword.
…lder The two nested-subgraph title fixtures now live in e2e/diagrams/flowchart/nested-subgraph-title/, so they form their own Argos sheet instead of joining diagrams/flowchart. e2e/sheet-order.json pins 139 of the 146 flowchart fixtures on develop. The unpinned rest is laid out alphabetically after them, and these two names sort before three of those fixtures, so every tile after them moved one cell and flowchart-012 and flowchart-013 were reported as changed although nothing in them re-rendered.
Renders the new syntax through the unified pipeline: elements become nodes, containment becomes clusters, relationships become edges, and each diagram kind decides which elements are legal in it. Person renders through the general-purpose `person` shape rather than one of its own, so the two C4 syntaxes draw the same vocabulary. Deployment nodes carry instance counts, and an infrastructure node is a first-class element rather than a container in disguise. An element that is external is tagged rather than keyworded, which keeps the grammar smaller and lets a diagram style it like any other tag.
…t data A deployment diagram nests four levels deep and needs more room above a cluster title than the flowchart default leaves. The margin is read from the layout data when the diagram supplies it, and falls back to the config otherwise, so no existing diagram changes.
Seven rendering cases across the four diagram kinds, including the live deployment example from the C4 model site, which is the one that exercises instance counts, an infrastructure node and four levels of nesting at once. The beta-keyword policy test is extended to cover `c4-beta`, so the diagram cannot ship without the suffix while the syntax is still moving.
WebKit (Safari, Preview) paints HTML that has CSS opacity inside a foreignObject without the ancestor SVG transforms. The technology line and the instance badge of deployment nodes were therefore drawn stacked at the top-left corner of the diagram. Use a translucent title colour for .cluster small and the instance badge instead of opacity. The look in Chromium is unchanged.
The title reserve reads each cluster's label height, but dagre only measured a cluster label while painting it, after layout. Every reserve therefore fell back to the flat margin, so a title taller than `subGraphTitleMargin` still overlapped the cluster's first row. `measureDagreGraph` now measures each cluster title before layout, the same way `insertCluster` paints it (plain labels unwrapped, markdown wrapped), and only when a title margin is set. A recursively rendered cluster measures its own title too, and its painter moves children, edges and nested clusters down by however much a title overflows the margin. When every title fits, the output is unchanged.
Fourteen c4 theme variables, defined in every theme rather than only the default one, replacing the colours the renderer held itself. An element's colour is now a property of the theme, so a diagram follows the page it sits on, and a theme author has one place to change. The infrastructure node gets its own pair rather than borrowing the deployment node's, because the two are drawn as different things.
A C4 diagram is read by people who did not write it, and the notation's colours mean nothing without a key. The legend lists only the element kinds and tags the diagram actually contains, with swatches resolved from the theme, so it cannot describe something that is not on the page.
The mermaid type build failed on this branch with TS2345 in c4-beta/db.ts: a leaf element's node was typed with Node['shape'], and on current develop that union also holds the cluster-only 'swimlane' shape, which a node with isGroup: false cannot take. applyTags and the default leaf shape now use NonClusterNode['shape']. Nothing changes at runtime; the lint, unit-test, docs and e2e jobs all stopped at this type error.
The legend section said every swatch matches the element fill and gave `system` and `external system` as example labels. An element kind is drawn as an outline in that kind's colour on the page background, a style tag uses the tag's own fill and stroke, and the labels are the kind names, such as `softwareSystem`.
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Summary
Adds an auto-generated legend to
c4-beta: one entry per element kind in use (external variants listed separately) followed by one entry per user-defined style tag, rendered as plain SVG below the diagram. Opt out with alegend offstatement.Merge notes (rebased onto the current #7843):
buildLegendItemswas ported to feat(c4-beta): experimental structurizr-inspired C4 diagram type (RFC prototype) #7843's model:externalis read from the convention tag (not a keyword), thesoftwareSystemkind is used, and external entries get a grey legend swatch (the inlineEXTERNAL_COLORSwas removed in feat(c4-beta): experimental structurizr-inspired C4 diagram type (RFC prototype) #7843; legend colours come from the still-inlineELEMENT_COLORS).softwareSystem ... :::external).Stacked on #7843 (c4-beta prototype) - draft until #7843 merges; the diff carries #7843's commits until then. Tracked in #7849.
Slice commits (review by commit):
feat(c4-beta): parse legend on/off statementfeat(c4-beta): derive legend entries in the dbfeat(c4-beta): render the legenddocs(c4-beta): document the auto-generated legendSummary
c4-betadiagram type with Langium parsing, rendering, styling, registration, examples, and documentation.legend offdisables it.Status