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import dcmjs from 'dcmjs';
import {
moduleDefinitions,
USRegionChild,
CLINICAL_TRIAL,
RadiopharmaceuticalInfoModule,
} from './modules';
import type { ModuleTagEntry } from './modules';
const dicomDictionary = dcmjs.data.DicomMetaDictionary.dictionary;
const nameMap = dcmjs.data.DicomMetaDictionary.nameMap;
// Re-export custom module name constants for backward compatibility
export { USRegionChild, CLINICAL_TRIAL, RadiopharmaceuticalInfoModule };
export interface TagEntry {
name: string;
lowerName: string;
xTag: string;
vm: number;
tag: string;
vr: string;
primaryGroup: string;
groups: string[];
}
/**
* Creates a tag entry defining module membership only.
* VR and VM are resolved from the dcmjs dictionary in addTag().
*/
export function createTagEntry(hexTag: string, ...groups: string[]): TagEntry {
return {
tag: hexTag,
groups,
xTag: null,
primaryGroup: null,
name: null,
lowerName: null,
vr: null,
vm: null,
};
}
/**
* Parses a DICOM VM string (e.g. "1", "1-n", "2") into a numeric value.
* Returns 1 for single-valued, the exact count for fixed multi-valued,
* or 0 for variable-length multi-valued.
*/
export function parseVm(vm: string | number | undefined): number | null {
Iif (vm === undefined || vm === null) {
return null;
}
Iif (typeof vm === 'number') {
return vm;
}
const n = parseInt(vm, 10);
// If the string is exactly a number (like "1", "2", "3"), return it
if (String(n) === vm) {
return n;
}
// Otherwise it's a range like "1-n", "2-n", "1-3" → multi-valued
return 0;
}
/**
* Looks up a tag in the dcmjs dictionary by hex string (e.g. "00080005").
* Returns { name, vr, vm } or undefined if not found.
*/
export function dictionaryLookup(
hexTag: string
): { name: string; vr: string; vm: string } | undefined {
return dicomDictionary[hexTag.toUpperCase()];
}
/**
* Looks up the hex tag code for a natural tag name (e.g. "SOPInstanceUID" → "00080018").
* Uses the mapTagInfo registry which is populated from the Tags definitions.
*/
export function getTagCodeByName(name: string): string | undefined {
return mapTagInfo.get(name)?.tag;
}
export const mapModuleTags = new Map<string, TagEntry[]>();
export const mapTagInfo = new Map<string, TagEntry>();
/**
* Adds a tag name/type, resolving vr/vm from the dcmjs dictionary.
*/
export function addTag(name: string, value: TagEntry) {
Iif (name && value.name && name !== value.name) {
throw new Error(
`Tag name provided and value don't match: ${name} !== ${value.name}`
);
}
value.name ||= name;
value.lowerName ||= metaData.toLowerCamelTag(name);
Tags[name] = value;
const { tag: hexTag } = value;
value.primaryGroup ||= value.groups?.[0];
const { groups } = value;
mapTagInfo.set(name, value);
Eif (hexTag) {
value.xTag = `x${hexTag.toLowerCase()}`;
value.tag = hexTag.toUpperCase();
mapTagInfo.set(value.xTag, value);
mapTagInfo.set(value.tag, value);
// Resolve vr/vm from dcmjs dictionary if not already set
Eif (!value.vr) {
const dictEntry = dicomDictionary[value.tag];
Eif (dictEntry) {
value.vr = dictEntry.vr;
value.vm = parseVm(dictEntry.vm);
}
}
}
if (groups?.length) {
for (const group of groups) {
let moduleEntries = mapModuleTags.get(group);
if (!moduleEntries) {
moduleEntries = [value];
mapModuleTags.set(group, moduleEntries);
return;
}
const foundIndex = moduleEntries.findIndex((it) => it.name === name);
if (foundIndex === -1) {
moduleEntries.push(value);
} else E{
moduleEntries[foundIndex] = value;
}
}
}
}
/**
* Resolves a tag keyword to its hex code using dcmjs nameMap.
* nameMap entries have tag in "(GGGG,EEEE)" format; we unpunctuate to "GGGGEEEE".
*/
export function resolveHexFromKeyword(keyword: string): string | undefined {
const entry = nameMap[keyword];
Iif (!entry) {
return undefined;
}
return entry.tag.substring(1, 5) + entry.tag.substring(6, 10);
}
/**
* The Tags object. Built at module load time from moduleDefinitions
* and dcmjs nameMap lookups.
*/
export const Tags: Record<string, TagEntry> = {};
// Accumulate groups per keyword across all module definitions.
// Tags appearing in multiple modules get all their groups collected.
const tagGroups = new Map<string, { hex: string; groups: string[] }>();
for (const [moduleName, keywords] of moduleDefinitions) {
for (const entry of keywords as ModuleTagEntry[]) {
const keyword = typeof entry === 'string' ? entry : entry[0];
const hexOverride = typeof entry === 'string' ? undefined : entry[1];
let data = tagGroups.get(keyword);
if (!data) {
const hex = hexOverride ?? resolveHexFromKeyword(keyword);
data = { hex, groups: [] };
tagGroups.set(keyword, data);
}
if (moduleName !== null) {
data.groups.push(moduleName);
}
}
}
// Create TagEntry objects and register them
for (const [keyword, { hex, groups }] of tagGroups) {
Iif (!hex) {
console.warn(`Tags: keyword "${keyword}" not found in dcmjs nameMap`);
continue;
}
addTag(keyword, createTagEntry(hex, ...groups));
}
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