HtmlDecode() [1/3]

static void System.Net.WebUtility.HtmlDecode ( ReadOnlySpan< char > input, ref ValueStringBuilder output )

inlinestaticprivate

Definition at line 567 of file WebUtility.cs.

    {
        for (int i = 0; i < input.Length; i++)
        {
            char c = input[i];
            if (c == '&')
            {
                ReadOnlySpan<char> span = input.Slice(i + 1);
                int num = span.IndexOfAny(';', '&');
                if (num >= 0 && span[num] == ';')
                {
                    int num2 = i + 1 + num;
                    if (num > 1 && span[0] == '#')
                    {
                        uint result;
                        bool flag = ((span[1] == 'x' || span[1] == 'X') ? uint.TryParse(span.Slice(2, num - 2), NumberStyles.AllowHexSpecifier, CultureInfo.InvariantCulture, out result) : uint.TryParse(span.Slice(1, num - 1), NumberStyles.Integer, CultureInfo.InvariantCulture, out result));
                        if (flag)
                        {
                            flag = result < 55296 || (57343 < result && result <= 1114111);
                        }
                        if (flag)
                        {
                            if (result <= 65535)
                            {
                                output.Append((char)result);
                            }
                            else
                            {
                                ConvertSmpToUtf16(result, out var leadingSurrogate, out var trailingSurrogate);
                                output.Append(leadingSurrogate);
                                output.Append(trailingSurrogate);
                            }
                            i = num2;
                            continue;
                        }
                    }
                    else
                    {
                        ReadOnlySpan<char> readOnlySpan = span.Slice(0, num);
                        i = num2;
                        char c2 = HtmlEntities.Lookup(readOnlySpan);
                        if (c2 == '\0')
                        {
                            output.Append('&');
                            output.Append(readOnlySpan);
                            output.Append(';');
                            continue;
                        }
                        c = c2;
                    }
                }
            }
            output.Append(c);
        }
    }

References System.Net.WebUtility.ConvertSmpToUtf16(), System.input, System.Globalization.CultureInfo.InvariantCulture, and System.Net.WebUtility.HtmlEntities.Lookup().