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ArrayT = require './Array'
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{Number:NumberT} = require './Number'
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utils = require './utils'
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{inspect} = require 'util'
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class LazyArrayT extends ArrayT
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decode: (stream, parent) ->
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pos = stream.pos
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length = utils.resolveLength @length, stream, parent
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if @length instanceof NumberT
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parent =
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parent: parent
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_startOffset: pos
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_currentOffset: 0
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_length: length
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res = new LazyArray @type, length, stream, parent
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stream.pos += length * @type.size(null, parent)
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return res
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size: (val, ctx) ->
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if val instanceof LazyArray
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val = val.toArray()
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super val, ctx
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encode: (stream, val, ctx) ->
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if val instanceof LazyArray
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val = val.toArray()
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super stream, val, ctx
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class LazyArray
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constructor: (@type, @length, @stream, @ctx) ->
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@base = @stream.pos
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@items = []
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get: (index) ->
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if index < 0 or index >= @length
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return undefined
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unless @items[index]?
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pos = @stream.pos
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@stream.pos = @base + @type.size(null, @ctx) * index
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@items[index] = @type.decode @stream, @ctx
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@stream.pos = pos
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return @items[index]
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toArray: ->
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@get(i) for i in [0...@length] by 1
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inspect: ->
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inspect @toArray()
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module.exports = LazyArrayT
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