Ben Stull
50 lines
1.7 KiB
TypeScript
50 lines
1.7 KiB
TypeScript
/**
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* mermaidDiff — F7.1 (#22) dispatcher. Detects a mermaid diagram's type and
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* routes a baseline→current diff to the matching pure differ, which re-emits the
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* CURRENT diagram source augmented with mermaid styling directives (INV-29). Any
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* unsupported type or parser surprise degrades to the v1 whole-block badge
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* (INV-30) — this function never throws. vscode-free, DOM-free, deterministic.
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*/
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import { diffFlowchart } from "./mermaidFlowchartDiff";
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import { diffSequence } from "./mermaidSequenceDiff";
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/** Theme-neutral colors baked into emitted mermaid source (source can't read CSS vars). */
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export const CW_COLORS = {
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added: "#2ea043",
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changed: "#d29922",
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removed: "#808080",
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} as const;
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export type DiagramType = "flowchart" | "sequence" | "other";
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export interface MermaidDiffAugmented {
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kind: "augmented";
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source: string;
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}
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export interface MermaidDiffFallback {
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kind: "fallback";
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}
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export type MermaidDiffResult = MermaidDiffAugmented | MermaidDiffFallback;
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export function detectDiagramType(source: string): DiagramType {
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for (const line of source.split(/\r?\n/)) {
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const t = line.trim();
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if (t === "" || t.startsWith("%%")) continue;
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if (/^(flowchart|graph)\b/.test(t)) return "flowchart";
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if (/^sequenceDiagram\b/.test(t)) return "sequence";
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return "other";
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}
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return "other";
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}
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export function diffMermaid(beforeSrc: string, currentSrc: string): MermaidDiffResult {
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const type = detectDiagramType(currentSrc);
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try {
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if (type === "flowchart") return { kind: "augmented", source: diffFlowchart(beforeSrc, currentSrc) };
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if (type === "sequence") return { kind: "augmented", source: diffSequence(beforeSrc, currentSrc) };
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} catch {
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return { kind: "fallback" };
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}
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return { kind: "fallback" };
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}
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