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feat(c4-beta): theme element colors via c4 theme variables - #7868
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🦋 Changeset detectedLatest commit: a02f96d The changes in this PR will be included in the next version bump. This PR includes changesets to release 2 packages
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## develop #7868 +/- ##
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+ Coverage 80.73% 81.45% +0.71%
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Rebased onto the refreshed #7843 base, which is itself now on current Two things to flag, since this push is more than a rebase:
The rebase conflict was in 54 c4-beta unit tests pass and Still an RFC prototype for #7844 rather than a merge candidate. |
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📝 WalkthroughWalkthroughThe pull request adds the experimental ChangesC4 beta diagram and layout changes
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Author
participant MermaidParser
participant C4BetaDB
participant C4BetaRenderer
participant Dagre
Author->>MermaidParser: Provide c4-beta diagram text
MermaidParser->>C4BetaDB: Populate parsed elements and relationships
C4BetaRenderer->>C4BetaDB: Build layout data
C4BetaRenderer->>Dagre: Render configured C4 layout
Dagre-->>C4BetaRenderer: Return positioned nodes and clusters
C4BetaRenderer-->>Author: Produce SVG diagram
Merge Risk: 🔵 Low · up to Some titled-cluster self-loop labels can be visibly detached from their arrows, and C4 arrowheads do not use the configured theme color. These are bounded rendering defects that should be corrected before relying on the new beta diagram styling. 🚥 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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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@e2e/platform/c4-beta-proof.html`:
- Line 1: Update the root markup before the html element to declare standards
mode with an HTML5 doctype, ensuring the proof page complies with the
doctype-first rule.
In `@packages/mermaid/src/diagrams/c4-beta/db.ts`:
- Line 309: Remove the arrowheadStyle property setting the inline `#333` fill from
the relevant C4 database element configuration, allowing the themed
.arrowheadPath rule and arrowheadColor to control the arrowhead color.
In `@packages/mermaid/src/diagrams/c4-beta/detector.ts`:
- Line 10: Update the C4-beta detector’s regular expression so it matches
c4-beta only when followed by whitespace or end-of-input, preventing prefixes
such as c4-beta-invalid from being detected.
In `@packages/mermaid/src/diagrams/c4-beta/renderer.spec.ts`:
- Line 164: Update the personStroke regex to allow optional whitespace after the
CSS opening brace and after the stroke property delimiter, so it matches the
newline-indented output from getStyles() while preserving the existing
stroke-value capture.
In `@packages/mermaid/src/rendering-util/layout-algorithms/dagre/index.js`:
- Line 515: Update the edge-routing flow near cumulativeAncestorReserve and the
Dagre route calculation so edges receive the same cumulative hierarchy reserve
as their nested node endpoints, rather than only subGraphTitleTotalMargin / 2.
Apply the reserve before routing or transform the resulting route consistently,
preserving alignment for edges nested under multiple subgraphs such as TOP and
B1.
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.changeset/c4-beta-diagram.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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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@packages/mermaid/src/diagrams/c4-beta/styles.ts`:
- Line 72: Update the C4 style selectors to use the configured border options
for strokes instead of background options: replace each c4*Bkg reference in the
stroke declarations with its corresponding c4*Border option for person, system,
container, component, infrastructure, and external elements.
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e2e/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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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@packages/mermaid/src/diagrams/c4-beta/styles.ts`:
- Around line 149-151: Update the C4 style rule from .arrowheadPath to
.arrowMarkerPath so reachable relationship point markers receive
options.arrowheadColor, matching the class used by markers.js and overriding the
SVG fill attribute.
In `@packages/mermaid/src/rendering-util/layout-algorithms/dagre/index.js`:
- Line 568: Update the self-loop label handling in normalizeDagreEdge so placed
labels also receive edgeOffsetY when restoring their Y position; preserve the
existing route-point adjustment and ensure labels with zero midReserve are
shifted consistently.
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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.
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Summary
Themes the
c4-betaelement colours via c4 theme variables instead of db-emitted inline styles. Addsc4PersonBkg/Border,c4SystemBkg/Border,c4ContainerBkg/Border,c4ComponentBkg/Border,c4ExternalBkg/Border,c4BoundaryBorderandc4TextColorto all themes (light themes keep the Structurizr palette; dark themes get readable values), and moves the per-kind colours into theme-driven class rules instyles.ts. Tag style overrides are still emitted inline so they win.Merge notes (rebased onto the current #7843):
infrastructureNode(added to c4-beta after this slice was written) keeps its inline grey - it is not part of the themed element palette..c4-systemrule is now.c4-softwareSystem(the kind was renamed).Stacked on #7843 (c4-beta prototype) - draft until #7843 merges; the diff carries #7843's commits until then. Tracked in #7849.
Summary
Adds the experimental
c4-betadiagram type with Langium parsing, C4 elements and relationships, rendering, theme-based styling, documentation, examples, demos, and tests.Key changes
c4-betain the parser and diagram orchestration pipeline..c4-softwareSystemfor software systems and thepersonshape for person elements.Validation
The author reports that 54
c4-betaunit tests pass and TypeScript compilation is clean. The PR remains a draft RFC prototype.