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54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
// TODO: This file was created by bulk-decaffeinate.
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// Sanity-check the conversion and remove this comment.
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/*
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* decaffeinate suggestions:
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* DS102: Remove unnecessary code created because of implicit returns
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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// This is a really simple OT type. Its not compiled with the web client, but it could be.
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//
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// Its mostly included for demonstration purposes and its used in a lot of unit tests.
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//
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// This defines a really simple text OT type which only allows inserts. (No deletes).
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//
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// Ops look like:
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// {position:#, text:"asdf"}
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//
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// Document snapshots look like:
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// {str:string}
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module.exports = {
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// The name of the OT type. The type is stored in types[type.name]. The name can be
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// used in place of the actual type in all the API methods.
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name: 'simple',
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// Create a new document snapshot
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create() {
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return { str: '' }
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},
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// Apply the given op to the document snapshot. Returns the new snapshot.
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//
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// The original snapshot should not be modified.
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apply(snapshot, op) {
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if (!(op.position >= 0 && op.position <= snapshot.str.length)) {
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throw new Error('Invalid position')
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}
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let { str } = snapshot
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str = str.slice(0, op.position) + op.text + str.slice(op.position)
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return { str }
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},
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// transform op1 by op2. Return transformed version of op1.
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// sym describes the symmetry of the op. Its 'left' or 'right' depending on whether the
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// op being transformed comes from the client or the server.
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transform(op1, op2, sym) {
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let pos = op1.position
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if (op2.position < pos || (op2.position === pos && sym === 'left')) {
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pos += op2.text.length
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}
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return { position: pos, text: op1.text }
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}
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}
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