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Commit Description:
add model solution
Commit Description:
add model solution
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node_modules/restructure/src/VersionedStruct.coffee
| 91 lines
| 2.2 KiB
| text/coffeescript
| CoffeeScriptLexer
|
| r789 | Struct = require './Struct' | |||
| class VersionedStruct extends Struct | ||||
| constructor: (@type, @versions = {}) -> | ||||
| if typeof @type is 'string' | ||||
| @versionGetter = new Function('parent', "return parent.#{@type}") | ||||
| @versionSetter = new Function('parent', 'version', "return parent.#{@type} = version") | ||||
| decode: (stream, parent, length = 0) -> | ||||
| res = @_setup stream, parent, length | ||||
| if typeof @type is 'string' | ||||
| res.version = @versionGetter parent | ||||
| else | ||||
| res.version = @type.decode(stream) | ||||
| if @versions.header | ||||
| @_parseFields stream, res, @versions.header | ||||
| fields = @versions[res.version] | ||||
| if not fields? | ||||
| throw new Error "Unknown version #{res.version}" | ||||
| if fields instanceof VersionedStruct | ||||
| return fields.decode(stream, parent) | ||||
| @_parseFields stream, res, fields | ||||
| @process?.call(res, stream) | ||||
| return res | ||||
| size: (val, parent, includePointers = true) -> | ||||
| unless val | ||||
| throw new Error 'Not a fixed size' | ||||
| ctx = | ||||
| parent: parent | ||||
| val: val | ||||
| pointerSize: 0 | ||||
| size = 0 | ||||
| if typeof @type isnt 'string' | ||||
| size += @type.size(val.version, ctx) | ||||
| if @versions.header | ||||
| for key, type of @versions.header when type.size? | ||||
| size += type.size(val[key], ctx) | ||||
| fields = @versions[val.version] | ||||
| if not fields? | ||||
| throw new Error "Unknown version #{val.version}" | ||||
| for key, type of fields when type.size? | ||||
| size += type.size(val[key], ctx) | ||||
| if includePointers | ||||
| size += ctx.pointerSize | ||||
| return size | ||||
| encode: (stream, val, parent) -> | ||||
| @preEncode?.call(val, stream) | ||||
| ctx = | ||||
| pointers: [] | ||||
| startOffset: stream.pos | ||||
| parent: parent | ||||
| val: val | ||||
| pointerSize: 0 | ||||
| ctx.pointerOffset = stream.pos + @size(val, ctx, false) | ||||
| if typeof @type isnt 'string' | ||||
| @type.encode(stream, val.version) | ||||
| if @versions.header | ||||
| for key, type of @versions.header when type.encode? | ||||
| type.encode(stream, val[key], ctx) | ||||
| fields = @versions[val.version] | ||||
| for key, type of fields when type.encode? | ||||
| type.encode(stream, val[key], ctx) | ||||
| i = 0 | ||||
| while i < ctx.pointers.length | ||||
| ptr = ctx.pointers[i++] | ||||
| ptr.type.encode(stream, ptr.val, ptr.parent) | ||||
| return | ||||
| module.exports = VersionedStruct | ||||