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40 lines
925 B
JavaScript
40 lines
925 B
JavaScript
const DMP = require('diff-match-patch')
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const dmp = new DMP()
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// Do not attempt to produce a diff for more than 100ms
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dmp.Diff_Timeout = 0.1
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module.exports = {
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ADDED: 1,
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REMOVED: -1,
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UNCHANGED: 0,
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diffAsShareJsOp(before, after, callback) {
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const diffs = dmp.diff_main(before.join('\n'), after.join('\n'))
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dmp.diff_cleanupSemantic(diffs)
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const ops = []
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let position = 0
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for (const diff of diffs) {
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const type = diff[0]
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const content = diff[1]
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if (type === this.ADDED) {
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ops.push({
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i: content,
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p: position,
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})
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position += content.length
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} else if (type === this.REMOVED) {
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ops.push({
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d: content,
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p: position,
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})
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} else if (type === this.UNCHANGED) {
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position += content.length
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} else {
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throw new Error('Unknown type')
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}
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}
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callback(null, ops)
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},
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}
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