mirror of https://github.com/waku-org/nwaku.git
52 lines
1.5 KiB
Nim
52 lines
1.5 KiB
Nim
import std/strutils, stew/results, regex
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proc parseMsgSize*(input: string): Result[uint64, string] =
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## Parses size strings such as "1.2 KiB" or "3Kb" and returns the equivalent number of bytes
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## if the parse task goes well. If not, it returns an error describing the problem.
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const RegexDef = """\s*(\d+([\,\.]\d*)?)\s*([Kk]{0,1}[i]?[Bb]{1})"""
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const RegexParseSize = re2(RegexDef)
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var m: RegexMatch2
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if input.match(RegexParseSize, m) == false:
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return err("error in parseSize. regex is not matching: " & RegexDef)
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var value: float
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try:
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value = parseFloat(input[m.captures[0]].replace(",", "."))
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except ValueError:
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return err(
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"invalid size in parseSize: " & getCurrentExceptionMsg() & " error parsing: " &
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input[m.captures[0]] & " KKK : " & $m
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)
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let units = input[m.captures[2]].toLowerAscii() # units is "kib", or "kb", or "b".
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var multiplier: float
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case units
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of "kb":
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multiplier = 1000
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of "kib":
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multiplier = 1024
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of "ib":
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return err("wrong units. ib or iB aren't allowed.")
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else: ## bytes
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multiplier = 1
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value = value * multiplier
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return ok(uint64(value))
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proc parseCorrectMsgSize*(input: string): uint64 =
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## This proc always returns an int and wraps the following proc:
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##
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## proc parseMsgSize*(input: string): Result[int, string] = ...
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##
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## in case of error, it just returns 0, and this is expected to
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## be called only from a controlled and well-known inputs
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let ret = parseMsgSize(input).valueOr:
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return 0
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return ret
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