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# std/private/decode_helpers

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# Procs

    proc decodePercent(s: openArray[char]; i: var int): char {....raises: [], tags: [],
        forbids: [].}

  Converts `%xx` hexadecimal to the character 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.

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    proc handleHexChar(c: char): int {.inline, ...raises: [], tags: [], forbids: [].}

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    proc handleHexChar(c: char; x: var int): bool {.inline, ...raises: [], tags: [],
        forbids: [].}

  Converts `%xx` hexadecimal to the ordinal number and adds the result to `x`. Returns `true` if `c` is hexadecimal.

  When `c` is hexadecimal, the proc is equal to `x = x shl 4 + hex2Int(c)`.

  Example:

      var x = 0
      assert handleHexChar('a', x)
      assert x == 10

      assert handleHexChar('B', x)
      assert x == 171 # 10 shl 4 + 11

      assert not handleHexChar('?', x)
      assert x == 171 # unchanged

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