75 lines
2.6 KiB
Nim
75 lines
2.6 KiB
Nim
# Nimbus - Types, data structures and shared utilities used in network sync
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#
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# Copyright (c) 2018-2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or
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# distributed except according to those terms.
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## Some logging helper moved here in absence of a known better place.
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import
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std/[math, strutils]
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{.push raises: [].}
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proc toSI*(num: SomeUnsignedInt): string =
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## Prints `num` argument value greater than 99 as rounded SI unit.
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const
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siUnits = [
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# <limit> <multiplier> <symbol>
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( 100_000u64, 1000f64, 'k'),
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( 100_000_000u64, 1000_000f64, 'm'),
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( 100_000_000_000u64, 1000_000_000f64, 'g'),
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( 100_000_000_000_000u64, 1000_000_000_000f64, 't'),
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( 100_000_000_000_000_000u64, 1000_000_000_000_000f64, 'p'),
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(10_000_000_000_000_000_000u64, 1000_000_000_000_000_000f64, 'e')]
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lastUnit =
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# <no-limit-here> <multiplier> <symbol>
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( 1000_000_000_000_000_000_000f64, 'z')
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if num < 1000:
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return $num
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block checkRange:
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let
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uNum = num.uint64
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fRnd = (num.float + 5) * 100
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for (top, base, sig) in siUnits:
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if uNum < top:
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result = (fRnd / base).int.intToStr(3) & $sig
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break checkRange
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result = (fRnd / lastUnit[0]).int.intToStr(3) & $lastUnit[1]
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result.insert(".", result.len - 3)
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proc toPC*(
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num: float;
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digitsAfterDot: static[int] = 2;
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rounding: static[float] = 5.0
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): string =
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## Convert argument number `num` to percent string with decimal precision
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## stated as argument `digitsAfterDot`. Standard rounding is enabled by
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## default adjusting the first invisible digit, set `rounding = 0` to disable.
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const
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minDigits = digitsAfterDot + 1
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multiplier = (10 ^ (minDigits + 1)).float
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roundUp = rounding / 10.0
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let
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sign = if num < 0: "-" else: ""
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preTruncated = (num.abs * multiplier) + roundUp
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if int.high.float <= preTruncated:
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return "NaN"
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# `intToStr` will do `abs` which throws overflow exception when value of low()
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if preTruncated.int <= int.low():
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return "NaN"
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result = sign & preTruncated.int.intToStr(minDigits) & "%"
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when 0 < digitsAfterDot:
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result.insert(".", result.len - minDigits)
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