85 lines
3.2 KiB
Nim
85 lines
3.2 KiB
Nim
## Nim-Codex
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## Copyright (c) 2023 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))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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##
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import std/parseutils
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import pkg/chronos
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import ./utils/asyncheapqueue
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import ./utils/fileutils
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export asyncheapqueue, fileutils
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func divUp*[T: SomeInteger](a, b : T): T =
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## Division with result rounded up (rather than truncated as in 'div')
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assert(b != T(0))
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if a==T(0): T(0) else: ((a - T(1)) div b) + T(1)
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func roundUp*[T](a, b : T): T =
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## Round up 'a' to the next value divisible by 'b'
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divUp(a,b) * b
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when not declared(parseDuration): # Odd code formatting to minimize diff v. mainLine
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const Whitespace = {' ', '\t', '\v', '\r', '\l', '\f'}
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func toLowerAscii(c: char): char =
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if c in {'A'..'Z'}: char(uint8(c) xor 0b0010_0000'u8) else: c
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func parseDuration*(s: string, size: var Duration): int =
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## Parse a size qualified by simple time into `Duration`.
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##
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runnableExamples:
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var res: Duration # caller must still know if 'b' refers to bytes|bits
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doAssert parseDuration("10H", res) == 3
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doAssert res == initDuration(hours=10)
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doAssert parseDuration("64m", res) == 6
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doAssert res == initDuration(minutes=64)
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doAssert parseDuration("7m/block", res) == 2 # '/' stops parse
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doAssert res == initDuration(minutes=7) # 1 shl 30, forced binary metric
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doAssert parseDuration("3d", res) == 2 # '/' stops parse
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doAssert res == initDuration(days=3) # 1 shl 30, forced binary metric
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const prefix = "s" & "mhdw" # byte|bit & lowCase metric-ish prefixes
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const timeScale = [1.0, 60.0, 3600.0, 86_400.0, 604_800.0]
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var number: float
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var scale = 1.0
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result = parseFloat(s, number)
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if number < 0: # While parseFloat accepts negatives ..
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result = 0 #.. we do not since sizes cannot be < 0
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else:
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let start = result # Save spot to maybe unwind white to EOS
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while result < s.len and s[result] in Whitespace:
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inc result
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if result < s.len: # Illegal starting char => unity
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if (let si = prefix.find(s[result].toLowerAscii); si >= 0):
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inc result # Now parse the scale
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scale = timeScale[si]
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else: # Unwind result advancement when there..
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result = start #..is no unit to the end of `s`.
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var sizeF = number * scale + 0.5 # Saturate to int64.high when too big
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size = seconds(int(sizeF))
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when isMainModule:
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import unittest2
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suite "time parse":
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test "parseDuration":
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var res: Duration # caller must still know if 'b' refers to bytes|bits
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check parseDuration("10Hr", res) == 3
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check res == hours(10)
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check parseDuration("64min", res) == 3
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check res == minutes(64)
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check parseDuration("7m/block", res) == 2 # '/' stops parse
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check res == minutes(7) # 1 shl 30, forced binary metric
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check parseDuration("3d", res) == 2 # '/' stops parse
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check res == days(3) # 1 shl 30, forced binary metric
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