nimbus-eth1/nimbus/utils/prettify.nim

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