GoldenCrystal
45 lines
797 B
C#
45 lines
797 B
C#
namespace System.Unicode.Builder
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{
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public static class HexCodePoint
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{
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public static int ParsePrefixed(string s)
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{
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if (!s.StartsWith("U+"))
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{
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throw new FormatException("Expected a code point in the form U+nnnn.");
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}
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return Parse(s, 2);
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}
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public static int Parse(string s, int index)
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{
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return Parse(s, ref index);
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}
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public static int Parse(string s, ref int index)
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{
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int i = index;
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int accum = 0;
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while (i < s.Length)
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{
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char c = s[i];
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if (c == ' ') break;
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accum <<= 4;
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if (c >= '0' && c <= '9') accum |= c - '0';
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else if (c >= 'A' && c <= 'F') accum |= c - 'A' + 0xA;
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else if (c >= 'a' && c <= 'f') accum |= c - 'a' + 0xA;
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else throw new FormatException();
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++i;
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}
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index = i;
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return accum;
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}
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}
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}
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