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import { useMemo } from "react";
/* ── ODRL / EDC vocabulary terms that get special accent colouring ── */
const ODRL_KEYWORDS = new Set([
"odrl:permission",
"odrl:prohibition",
"odrl:duty",
"odrl:obligation",
"odrl:action",
"odrl:constraint",
"odrl:leftOperand",
"odrl:operator",
"odrl:rightOperand",
"odrl:assignee",
"odrl:assigner",
"odrl:target",
"odrl:use",
"odrl:Set",
"odrl:Offer",
"odrl:Agreement",
"odrl:eq",
"odrl:neq",
"odrl:gt",
"odrl:gteq",
"odrl:lt",
"odrl:lteq",
"odrl:isAnyOf",
"odrl:isAllOf",
"odrl:isNoneOf",
"odrl:commercialize",
]);
const EDC_KEYWORDS = new Set([
"edc:PolicyDefinition",
"edc:policy",
"edc:purpose",
"edc:inForceDate",
"edc:duration",
"edc:anonymize",
"edc:pseudonymize",
"edc:minimizeData",
"edc:kAnonymity",
"edc:reIdentify",
"edc:aggregateOnly",
"edc:maintainAuditTrail",
"edc:secureProcessingEnvironment",
"edc:extractTrainingData",
"edc:publishIndividualLevel",
"edc:secondaryUse",
"edc:thirdPartySharing",
"edc:logAccess",
"edc:notifyPatient",
"edc:patientConsent",
]);
/** CSS classes for each token type */
const C = {
key: "text-purple-400",
string: "text-emerald-400",
number: "text-amber-400",
bool: "text-sky-400",
null: "text-[var(--text-secondary)] italic",
brace: "text-[var(--text-secondary)]",
odrl: "text-cyan-400 font-semibold",
edc: "text-orange-400 font-semibold",
punc: "text-[var(--text-secondary)]",
} as const;
interface Token {
cls: string;
text: string;
}
/** Tokenise a JSON string into styled spans. */
function tokenise(json: string): Token[] {
const tokens: Token[] = [];
// Match JSON tokens: strings, numbers, booleans, null, structural chars
const re =
/("(?:[^"\\]|\\.)*")\s*(:?)|\b(-?\d+(?:\.\d+)?(?:[eE][+-]?\d+)?)\b|\b(true|false)\b|\b(null)\b|([{}[\],])/g;
let lastIndex = 0;
let m: RegExpExecArray | null;
while ((m = re.exec(json)) !== null) {
// Whitespace / newlines between tokens
if (m.index > lastIndex) {
tokens.push({ cls: "", text: json.slice(lastIndex, m.index) });
}
if (m[1] !== undefined) {
// String — might be a key (followed by ':') or a value
const raw = m[1];
const isKey = m[2] === ":";
const inner = raw.slice(1, -1); // without quotes
if (isKey) {
// Determine if it's an ODRL/EDC keyword
const cls = ODRL_KEYWORDS.has(inner)
? C.odrl
: EDC_KEYWORDS.has(inner)
? C.edc
: C.key;
tokens.push({ cls, text: raw });
tokens.push({ cls: C.punc, text: ":" });
} else {
// String value — check for vocabulary terms inside values
const cls = ODRL_KEYWORDS.has(inner)
? C.odrl
: EDC_KEYWORDS.has(inner)
? C.edc
: C.string;
tokens.push({ cls, text: raw });
}
} else if (m[3] !== undefined) {
tokens.push({ cls: C.number, text: m[3] });
} else if (m[4] !== undefined) {
tokens.push({ cls: C.bool, text: m[4] });
} else if (m[5] !== undefined) {
tokens.push({ cls: C.null, text: m[5] });
E} else if (m[6] !== undefined) {
tokens.push({ cls: C.brace, text: m[6] });
}
lastIndex = re.lastIndex;
}
// Trailing whitespace
Iif (lastIndex < json.length) {
tokens.push({ cls: "", text: json.slice(lastIndex) });
}
return tokens;
}
interface OdrlJsonHighlighterProps {
data: unknown;
className?: string;
}
export default function OdrlJsonHighlighter({
data,
className,
}: OdrlJsonHighlighterProps) {
const tokens = useMemo(() => {
const json = JSON.stringify(data, null, 2);
return tokenise(json);
}, [data]);
return (
<pre className={`overflow-auto text-xs leading-relaxed ${className ?? ""}`}>
{tokens.map((t, i) =>
t.cls ? (
<span key={i} className={t.cls}>
{t.text}
</span>
) : (
t.text
),
)}
</pre>
);
}
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