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- # This is a really simple OT type. Its not compiled with the web client, but it could be.
- #
- # Its mostly included for demonstration purposes and its used in a lot of unit tests.
- #
- # This defines a really simple text OT type which only allows inserts. (No deletes).
- #
- # Ops look like:
- # {position:#, text:"asdf"}
- #
- # Document snapshots look like:
- # {str:string}
- module.exports =
- # The name of the OT type. The type is stored in types[type.name]. The name can be
- # used in place of the actual type in all the API methods.
- name: 'simple'
- # Create a new document snapshot
- create: -> {str:""}
- # Apply the given op to the document snapshot. Returns the new snapshot.
- #
- # The original snapshot should not be modified.
- apply: (snapshot, op) ->
- throw new Error 'Invalid position' unless 0 <= op.position <= snapshot.str.length
- str = snapshot.str
- str = str.slice(0, op.position) + op.text + str.slice(op.position)
- {str}
- # transform op1 by op2. Return transformed version of op1.
- # sym describes the symmetry of the op. Its 'left' or 'right' depending on whether the
- # op being transformed comes from the client or the server.
- transform: (op1, op2, sym) ->
- pos = op1.position
- pos += op2.text.length if op2.position < pos or (op2.position == pos and sym is 'left')
- return {position:pos, text:op1.text}
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