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diff.ts
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diff.ts
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import { getTypeFromRegistry } from './registry';
import { isDiffObject, incomparable } from './symbols';
import {
Add,
Remove,
Replace,
ProsemirrorDoc,
Memoizer,
Registry,
CompareResult,
} from './types';
const add: Add = item => {
return {
[isDiffObject]: true,
add: item,
};
};
const remove: Remove = item => {
return {
[isDiffObject]: true,
remove: item,
};
};
const replace: Replace = (removed, added) => {
return {
[isDiffObject]: true,
...remove(removed),
...add(added),
};
};
const innerDiff = (
oldVersion: ProsemirrorDoc,
newVersion: ProsemirrorDoc,
registry: Registry,
memoizer: Memoizer
) => {
const compare = (ov, nv, context) => {
if (ov.type !== nv.type) {
return incomparable;
}
return memoizer.compare(
getTypeFromRegistry(registry, ov.type).diff.compare
)(ov, nv, context);
};
const weight = element => {
const resultWeight = memoizer.weight(
getTypeFromRegistry(registry, element.type).diff.weight
)(element, weight);
if (isNaN(resultWeight)) {
throw new Error('prosemirror-diff produced invalid element weight');
}
return resultWeight;
};
return registry.doc.diff.compare(oldVersion, newVersion, {
add,
remove,
replace,
compare,
weight,
memoizer,
});
};
export const diff = (oldVersion, newVersion, registry, memoizer) => {
const { result } = innerDiff(
oldVersion,
newVersion,
registry,
memoizer
) as CompareResult<ProsemirrorDoc>;
return result;
};