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65 lines
2.3 KiB
CoffeeScript
65 lines
2.3 KiB
CoffeeScript
# These methods let you build a transform function from a transformComponent function
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# for OT types like text and JSON in which operations are lists of components
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# and transforming them requires N^2 work.
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# Add transform and transformX functions for an OT type which has transformComponent defined.
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# transformComponent(destination array, component, other component, side)
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exports['_bt'] = bootstrapTransform = (type, transformComponent, checkValidOp, append) ->
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transformComponentX = (left, right, destLeft, destRight) ->
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transformComponent destLeft, left, right, 'left'
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transformComponent destRight, right, left, 'right'
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# Transforms rightOp by leftOp. Returns ['rightOp', clientOp']
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type.transformX = type['transformX'] = transformX = (leftOp, rightOp) ->
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checkValidOp leftOp
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checkValidOp rightOp
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newRightOp = []
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for rightComponent in rightOp
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# Generate newLeftOp by composing leftOp by rightComponent
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newLeftOp = []
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k = 0
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while k < leftOp.length
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nextC = []
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transformComponentX leftOp[k], rightComponent, newLeftOp, nextC
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k++
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if nextC.length == 1
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rightComponent = nextC[0]
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else if nextC.length == 0
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append newLeftOp, l for l in leftOp[k..]
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rightComponent = null
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break
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else
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# Recurse.
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[l_, r_] = transformX leftOp[k..], nextC
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append newLeftOp, l for l in l_
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append newRightOp, r for r in r_
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rightComponent = null
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break
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append newRightOp, rightComponent if rightComponent?
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leftOp = newLeftOp
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[leftOp, newRightOp]
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# Transforms op with specified type ('left' or 'right') by otherOp.
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type.transform = type['transform'] = (op, otherOp, type) ->
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throw new Error "type must be 'left' or 'right'" unless type == 'left' or type == 'right'
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return op if otherOp.length == 0
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# TODO: Benchmark with and without this line. I _think_ it'll make a big difference...?
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return transformComponent [], op[0], otherOp[0], type if op.length == 1 and otherOp.length == 1
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if type == 'left'
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[left, _] = transformX op, otherOp
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left
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else
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[_, right] = transformX otherOp, op
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right
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if typeof WEB is 'undefined'
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exports.bootstrapTransform = bootstrapTransform
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