Add support for measuring runes for console apps

Author: migueldeicaza

NStack/unicode/Rune.ColumnWidth.cs

@@ -0,0 +1,116 @@
+//
+// Contains a port of this code:
+// https://www.cl.cam.ac.uk/%7Emgk25/ucs/wcwidth.c
+//
+using NStack;
+
+namespace System
+{
+	public partial struct Rune
+	{
+		static uint [,] combining = new uint [,] {
+			{ 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
+			{ 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
+			{ 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
+			{ 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
+			{ 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
+			{ 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
+			{ 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
+			{ 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
+			{ 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
+			{ 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
+			{ 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
+			{ 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
+			{ 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
+			{ 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
+			{ 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
+			{ 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
+			{ 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
+			{ 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
+			{ 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
+			{ 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
+			{ 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
+			{ 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
+			{ 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
+			{ 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
+			{ 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
+			{ 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
+			{ 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
+			{ 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
+			{ 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
+			{ 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
+			{ 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
+			{ 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
+			{ 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
+			{ 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
+			{ 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
+			{ 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
+			{ 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
+			{ 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
+			{ 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
+			{ 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
+			{ 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
+			{ 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
+			{ 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
+			{ 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
+			{ 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
+			{ 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
+			{ 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
+			{ 0xE0100, 0xE01EF }
+		};
+
+		static int bisearch (uint rune, uint [,] table, int max)
+		{
+			int min = 0;
+			int mid;
+
+			if (rune < table [0, 0] || rune > table [max, 1])
+				return 0;
+			while (max >= min) {
+				mid = (min + max) / 2;
+				if (rune > table [mid, 1])
+					min = mid + 1;
+				else if (rune < table [mid, 0])
+					max = mid - 1;
+				else
+					return 1;
+			}
+
+			return 0;
+		}
+
+	        /// <summary>
+	        /// Number of column positions of a wide-character code.   This is used to measure runes as displayed by text-based terminals.
+	        /// </summary>
+	        /// <returns>The width in columns, 0 if the argument is the null character, -1 if the value is not printable, otherwise the number of columsn that the rune occupies.</returns>
+	        /// <param name="r">The red component.</param>
+	        public static int ColumnWidth (Rune rune) 
+	        {
+			uint irune = (uint)rune;
+			if (irune < 32)
+				return 0;
+			if (irune < 127)
+				return 1;
+			if (irune >= 0x7f && irune <= 0xa0)
+				return 0;
+			/* binary search in table of non-spacing characters */
+			if (bisearch (irune, combining, combining.GetLength (0)) != 0)
+				return 0;
+			/* if we arrive here, ucs is not a combining or C0/C1 control character */
+			return 1 +
+				((irune >= 0x1100 &&
+				 (irune <= 0x115f ||                    /* Hangul Jamo init. consonants */
+				irune == 0x2329 || irune == 0x232a ||
+				(irune >= 0x2e80 && irune <= 0xa4cf &&
+				irune != 0x303f) ||                  /* CJK ... Yi */
+				(irune >= 0xac00 && irune <= 0xd7a3) || /* Hangul Syllables */
+				(irune >= 0xf900 && irune <= 0xfaff) || /* CJK Compatibility Ideographs */
+				(irune >= 0xfe10 && irune <= 0xfe19) || /* Vertical forms */
+				(irune >= 0xfe30 && irune <= 0xfe6f) || /* CJK Compatibility Forms */
+				(irune >= 0xff00 && irune <= 0xff60) || /* Fullwidth Forms */
+				(irune >= 0xffe0 && irune <= 0xffe6) ||
+				(irune >= 0x20000 && irune <= 0x2fffd) ||
+				  (irune >= 0x30000 && irune <= 0x3fffd))) ? 1 : 0);
+	        }
+	}
+}

NStack/unicode/Rune.cs

@@ -779,6 +779,7 @@ public override bool Equals (Object obj)
 			Rune p = (Rune)obj;
 			return p.value == value;
 		}
+
 	}
 
 }