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move decode_helpers to std/private (#16209)

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flywind 2020-12-03 02:30:55 +08:00 • committed by GitHub
commit 139075e965
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3 changed files with 5 additions and 7 deletions
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24
lib/pure/includes/decode_helpers.nim
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@ -1,24 +0,0 @@
# Include file that implements 'decodePercent' and friends. Do not import it!
proc handleHexChar(c: char, x: var int, f: var bool) {.inline.} =
case c
of '0'..'9': x = (x shl 4) or (ord(c) - ord('0'))
of 'a'..'f': x = (x shl 4) or (ord(c) - ord('a') + 10)
of 'A'..'F': x = (x shl 4) or (ord(c) - ord('A') + 10)
else: f = true
proc decodePercent(s: string, i: var int): char =
## Converts `%xx` hexadecimal to the charracter with ordinal number `xx`.
##
## If `xx` is not a valid hexadecimal value, it is left intact: only the
## leading `%` is returned as-is, and `xx` characters will be processed in the
## next step (e.g. in `uri.decodeUrl`) as regular characters.
result = '%'
if i+2 < s.len:
var x = 0
var failed = false
handleHexChar(s[i+1], x, failed)
handleHexChar(s[i+2], x, failed)
if not failed:
result = chr(x)
inc(i, 2)