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8e662b33fb
Include tracked deletes in resync doc update GitOrigin-RevId: 410f9435f92ff44184f60a2695be27d7b819a1e2
69 lines
1.5 KiB
JavaScript
69 lines
1.5 KiB
JavaScript
// @ts-check
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/**
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* @typedef {import('./types').CommentOp} CommentOp
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* @typedef {import('./types').DeleteOp} DeleteOp
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* @typedef {import('./types').InsertOp} InsertOp
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* @typedef {import('./types').Op} Op
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* @typedef {import('./types').TrackedChange} TrackedChange
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*/
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/**
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* Returns true if the op is an insert
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*
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* @param {Op} op
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* @returns {op is InsertOp}
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*/
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function isInsert(op) {
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return 'i' in op && op.i != null
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}
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/**
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* Returns true if the op is an insert
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*
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* @param {Op} op
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* @returns {op is DeleteOp}
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*/
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function isDelete(op) {
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return 'd' in op && op.d != null
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}
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/**
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* Returns true if the op is a comment
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*
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* @param {Op} op
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* @returns {op is CommentOp}
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*/
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function isComment(op) {
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return 'c' in op && op.c != null
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}
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/**
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* Adds given tracked deletes to the given content.
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*
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* The history system includes tracked deletes in the document content.
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*
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* @param {string} content
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* @param {TrackedChange[]} trackedChanges
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* @return {string} content for the history service
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*/
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function addTrackedDeletesToContent(content, trackedChanges) {
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let cursor = 0
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let result = ''
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for (const change of trackedChanges) {
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if (isDelete(change.op)) {
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// Add the content before the tracked delete
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result += content.slice(cursor, change.op.p)
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cursor = change.op.p
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// Add the content of the tracked delete
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result += change.op.d
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}
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}
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// Add the content after all tracked deletes
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result += content.slice(cursor)
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return result
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}
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module.exports = { isInsert, isDelete, isComment, addTrackedDeletesToContent }
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