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dbay

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In-Process, In-Memory & File-Based Relational Data Processing with SQLite, BetterSQLite3

github.com/loveencounterflow/dbay

loveencounterflow/dbay

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'use strict' ############################################################################################################ GUY = require 'guy' { alert debug help info plain praise urge warn whisper } = GUY.trm.get_loggers 'DBAY/RANDOM' { rpr inspect echo log } = GUY.trm #........................................................................................................... guy = require 'guy' types = new ( require 'intertype' ).Intertype() #=========================================================================================================== types.declare 'constructor_cfg', tests: "@isa.object x": ( x ) -> @isa.object x "x.seed may be a float within certain boundaries": ( x ) -> return true unless x.seed? return false unless @isa.float x.seed return -1e10 < x.seed < +1e10 "x.delta may be a float within certain boundaries": ( x ) -> return true unless x.delta? return false unless @isa.float x.delta return false unless ( Math.abs x.delta ) > 1e-3 return -1e10 < x.delta < +1e10 #=========================================================================================================== # RANDOM NUMBER GENERATION # seedable for testing purposes #----------------------------------------------------------------------------------------------------------- class @Random #--------------------------------------------------------------------------------------------------------- @C: guy.lft.freeze defaults: #..................................................................................................... constructor_cfg: seed: null delta: null #========================================================================================================= constructor: ( cfg ) -> @cfg = guy.lft.freeze { @constructor.C.defaults.constructor_cfg..., cfg..., } types.validate.constructor_cfg @cfg if @cfg.seed? or @cfg.delta? seed = @cfg.seed ? 12.34 delta = @cfg.delta ? 1 @get_random_integer = GUY.rnd.get_rnd_int seed, delta else @get_random_integer = GUY.rnd.random_integer.bind GUY.rnd return undefined #--------------------------------------------------------------------------------------------------------- get_random_filename: ( extension = 'sqlite' ) -> n10 = @get_random_integer 1_000_000_000, 9_999_999_999 return "dbay-#{n10}.#{extension}"