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90 lines
2.4 KiB
JavaScript
90 lines
2.4 KiB
JavaScript
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# Text document API for text-tp2
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if WEB?
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type = exports.types['text-tp2']
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else
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type = require './text-tp2'
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{_takeDoc:takeDoc, _append:append} = type
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appendSkipChars = (op, doc, pos, maxlength) ->
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while (maxlength == undefined || maxlength > 0) and pos.index < doc.data.length
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part = takeDoc doc, pos, maxlength, true
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maxlength -= part.length if maxlength != undefined and typeof part is 'string'
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append op, (part.length || part)
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type['api'] =
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'provides': {'text':true}
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# The number of characters in the string
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'getLength': -> @snapshot.charLength
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# Flatten a document into a string
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'getText': ->
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strings = (elem for elem in @snapshot.data when typeof elem is 'string')
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strings.join ''
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'insert': (pos, text, callback) ->
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pos = 0 if pos == undefined
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op = []
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docPos = {index:0, offset:0}
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appendSkipChars op, @snapshot, docPos, pos
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append op, {'i':text}
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appendSkipChars op, @snapshot, docPos
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@submitOp op, callback
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op
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'del': (pos, length, callback) ->
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op = []
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docPos = {index:0, offset:0}
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appendSkipChars op, @snapshot, docPos, pos
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while length > 0
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part = takeDoc @snapshot, docPos, length, true
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if typeof part is 'string'
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append op, {'d':part.length}
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length -= part.length
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else
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append op, part
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appendSkipChars op, @snapshot, docPos
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@submitOp op, callback
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op
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'_register': ->
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# Interpret recieved ops + generate more detailed events for them
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@on 'remoteop', (op, snapshot) ->
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textPos = 0
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docPos = {index:0, offset:0}
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for component in op
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if typeof component is 'number'
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# Skip
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remainder = component
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while remainder > 0
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part = takeDoc snapshot, docPos, remainder
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if typeof part is 'string'
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textPos += part.length
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remainder -= part.length || part
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else if component.i != undefined
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# Insert
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if typeof component.i is 'string'
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@emit 'insert', textPos, component.i
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textPos += component.i.length
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else
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# Delete
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remainder = component.d
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while remainder > 0
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part = takeDoc snapshot, docPos, remainder
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if typeof part is 'string'
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@emit 'delete', textPos, part
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remainder -= part.length || part
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return
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