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authorS. Gilles <sgilles@math.umd.edu>2017-10-29 00:51:25 -0400
committerOri Bernstein <ori@eigenstate.org>2017-10-29 19:46:03 -0700
commitdde43f18e3b9f699c188c74064cf785917b41e22 (patch)
tree7f3c9863634a948a3a5047eb7e5deea6331d48a7
parent4ecfdbc4819481740991e7f477a32ed7396c7125 (diff)
downloadmc-dde43f18e3b9f699c188c74064cf785917b41e22.tar.gz
Implement graphemewidth
-rw-r--r--lib/std/chartype.myr470
-rw-r--r--lib/std/fmt.myr10
-rw-r--r--lib/std/test/chartype.myr18
-rw-r--r--lib/std/test/fmt.myr4
-rw-r--r--lib/std/test/utf.myrbin0 -> 1305 bytes
-rw-r--r--lib/std/utf.myr29
6 files changed, 522 insertions, 9 deletions
diff --git a/lib/std/chartype.myr b/lib/std/chartype.myr
index dd31e20..bf01d9a 100644
--- a/lib/std/chartype.myr
+++ b/lib/std/chartype.myr
@@ -26,6 +26,8 @@ pkg std =
const totitle : (c : char -> char)
generic charval : (c : char, base : int -> @a::(integral,numeric))
+
+ const cellwidth : (c : char -> int)
;;
extern const put : (fmt : byte[:], args : ... -> size)
@@ -1061,6 +1063,445 @@ const rtotitle1 = [
0x01f3, 499 /* dz Dz */
]
+/*
+ * Generated by
+ *
+ * uniset cat:Me,Mn,Cf | \
+ * sed -r 's/^([0-9a-f]+)[.][.]([0-9a-f]+)$/\t0x\1, 0x\2,/' |\
+ * sed -r 's/^([0-9a-f]+)$/\t0x\1, 0x\1,/'
+ */
+const width0 = [
+ 0xad, 0xad,
+ 0x300, 0x36f,
+ 0x483, 0x489,
+ 0x591, 0x5bd,
+ 0x5bf, 0x5bf,
+ 0x5c1, 0x5c2,
+ 0x5c4, 0x5c5,
+ 0x5c7, 0x5c7,
+ 0x600, 0x605,
+ 0x610, 0x61a,
+ 0x61c, 0x61c,
+ 0x64b, 0x65f,
+ 0x670, 0x670,
+ 0x6d6, 0x6dd,
+ 0x6df, 0x6e4,
+ 0x6e7, 0x6e8,
+ 0x6ea, 0x6ed,
+ 0x70f, 0x70f,
+ 0x711, 0x711,
+ 0x730, 0x74a,
+ 0x7a6, 0x7b0,
+ 0x7eb, 0x7f3,
+ 0x816, 0x819,
+ 0x81b, 0x823,
+ 0x825, 0x827,
+ 0x829, 0x82d,
+ 0x859, 0x85b,
+ 0x8d4, 0x902,
+ 0x93a, 0x93a,
+ 0x93c, 0x93c,
+ 0x941, 0x948,
+ 0x94d, 0x94d,
+ 0x951, 0x957,
+ 0x962, 0x963,
+ 0x981, 0x981,
+ 0x9bc, 0x9bc,
+ 0x9c1, 0x9c4,
+ 0x9cd, 0x9cd,
+ 0x9e2, 0x9e3,
+ 0xa01, 0xa02,
+ 0xa3c, 0xa3c,
+ 0xa41, 0xa42,
+ 0xa47, 0xa48,
+ 0xa4b, 0xa4d,
+ 0xa51, 0xa51,
+ 0xa70, 0xa71,
+ 0xa75, 0xa75,
+ 0xa81, 0xa82,
+ 0xabc, 0xabc,
+ 0xac1, 0xac5,
+ 0xac7, 0xac8,
+ 0xacd, 0xacd,
+ 0xae2, 0xae3,
+ 0xafa, 0xaff,
+ 0xb01, 0xb01,
+ 0xb3c, 0xb3c,
+ 0xb3f, 0xb3f,
+ 0xb41, 0xb44,
+ 0xb4d, 0xb4d,
+ 0xb56, 0xb56,
+ 0xb62, 0xb63,
+ 0xb82, 0xb82,
+ 0xbc0, 0xbc0,
+ 0xbcd, 0xbcd,
+ 0xc00, 0xc00,
+ 0xc3e, 0xc40,
+ 0xc46, 0xc48,
+ 0xc4a, 0xc4d,
+ 0xc55, 0xc56,
+ 0xc62, 0xc63,
+ 0xc81, 0xc81,
+ 0xcbc, 0xcbc,
+ 0xcbf, 0xcbf,
+ 0xcc6, 0xcc6,
+ 0xccc, 0xccd,
+ 0xce2, 0xce3,
+ 0xd00, 0xd01,
+ 0xd3b, 0xd3c,
+ 0xd41, 0xd44,
+ 0xd4d, 0xd4d,
+ 0xd62, 0xd63,
+ 0xdca, 0xdca,
+ 0xdd2, 0xdd4,
+ 0xdd6, 0xdd6,
+ 0xe31, 0xe31,
+ 0xe34, 0xe3a,
+ 0xe47, 0xe4e,
+ 0xeb1, 0xeb1,
+ 0xeb4, 0xeb9,
+ 0xebb, 0xebc,
+ 0xec8, 0xecd,
+ 0xf18, 0xf19,
+ 0xf35, 0xf35,
+ 0xf37, 0xf37,
+ 0xf39, 0xf39,
+ 0xf71, 0xf7e,
+ 0xf80, 0xf84,
+ 0xf86, 0xf87,
+ 0xf8d, 0xf97,
+ 0xf99, 0xfbc,
+ 0xfc6, 0xfc6,
+ 0x102d, 0x1030,
+ 0x1032, 0x1037,
+ 0x1039, 0x103a,
+ 0x103d, 0x103e,
+ 0x1058, 0x1059,
+ 0x105e, 0x1060,
+ 0x1071, 0x1074,
+ 0x1082, 0x1082,
+ 0x1085, 0x1086,
+ 0x108d, 0x108d,
+ 0x109d, 0x109d,
+ 0x135d, 0x135f,
+ 0x1712, 0x1714,
+ 0x1732, 0x1734,
+ 0x1752, 0x1753,
+ 0x1772, 0x1773,
+ 0x17b4, 0x17b5,
+ 0x17b7, 0x17bd,
+ 0x17c6, 0x17c6,
+ 0x17c9, 0x17d3,
+ 0x17dd, 0x17dd,
+ 0x180b, 0x180e,
+ 0x1885, 0x1886,
+ 0x18a9, 0x18a9,
+ 0x1920, 0x1922,
+ 0x1927, 0x1928,
+ 0x1932, 0x1932,
+ 0x1939, 0x193b,
+ 0x1a17, 0x1a18,
+ 0x1a1b, 0x1a1b,
+ 0x1a56, 0x1a56,
+ 0x1a58, 0x1a5e,
+ 0x1a60, 0x1a60,
+ 0x1a62, 0x1a62,
+ 0x1a65, 0x1a6c,
+ 0x1a73, 0x1a7c,
+ 0x1a7f, 0x1a7f,
+ 0x1ab0, 0x1abe,
+ 0x1b00, 0x1b03,
+ 0x1b34, 0x1b34,
+ 0x1b36, 0x1b3a,
+ 0x1b3c, 0x1b3c,
+ 0x1b42, 0x1b42,
+ 0x1b6b, 0x1b73,
+ 0x1b80, 0x1b81,
+ 0x1ba2, 0x1ba5,
+ 0x1ba8, 0x1ba9,
+ 0x1bab, 0x1bad,
+ 0x1be6, 0x1be6,
+ 0x1be8, 0x1be9,
+ 0x1bed, 0x1bed,
+ 0x1bef, 0x1bf1,
+ 0x1c2c, 0x1c33,
+ 0x1c36, 0x1c37,
+ 0x1cd0, 0x1cd2,
+ 0x1cd4, 0x1ce0,
+ 0x1ce2, 0x1ce8,
+ 0x1ced, 0x1ced,
+ 0x1cf4, 0x1cf4,
+ 0x1cf8, 0x1cf9,
+ 0x1dc0, 0x1df9,
+ 0x1dfb, 0x1dff,
+ 0x200b, 0x200f,
+ 0x202a, 0x202e,
+ 0x2060, 0x2064,
+ 0x2066, 0x206f,
+ 0x20d0, 0x20f0,
+ 0x2cef, 0x2cf1,
+ 0x2d7f, 0x2d7f,
+ 0x2de0, 0x2dff,
+ 0x302a, 0x302d,
+ 0x3099, 0x309a,
+ 0xa66f, 0xa672,
+ 0xa674, 0xa67d,
+ 0xa69e, 0xa69f,
+ 0xa6f0, 0xa6f1,
+ 0xa802, 0xa802,
+ 0xa806, 0xa806,
+ 0xa80b, 0xa80b,
+ 0xa825, 0xa826,
+ 0xa8c4, 0xa8c5,
+ 0xa8e0, 0xa8f1,
+ 0xa926, 0xa92d,
+ 0xa947, 0xa951,
+ 0xa980, 0xa982,
+ 0xa9b3, 0xa9b3,
+ 0xa9b6, 0xa9b9,
+ 0xa9bc, 0xa9bc,
+ 0xa9e5, 0xa9e5,
+ 0xaa29, 0xaa2e,
+ 0xaa31, 0xaa32,
+ 0xaa35, 0xaa36,
+ 0xaa43, 0xaa43,
+ 0xaa4c, 0xaa4c,
+ 0xaa7c, 0xaa7c,
+ 0xaab0, 0xaab0,
+ 0xaab2, 0xaab4,
+ 0xaab7, 0xaab8,
+ 0xaabe, 0xaabf,
+ 0xaac1, 0xaac1,
+ 0xaaec, 0xaaed,
+ 0xaaf6, 0xaaf6,
+ 0xabe5, 0xabe5,
+ 0xabe8, 0xabe8,
+ 0xabed, 0xabed,
+ 0xfb1e, 0xfb1e,
+ 0xfe00, 0xfe0f,
+ 0xfe20, 0xfe2f,
+ 0xfeff, 0xfeff,
+ 0xfff9, 0xfffb,
+ 0x101fd, 0x101fd,
+ 0x102e0, 0x102e0,
+ 0x10376, 0x1037a,
+ 0x10a01, 0x10a03,
+ 0x10a05, 0x10a06,
+ 0x10a0c, 0x10a0f,
+ 0x10a38, 0x10a3a,
+ 0x10a3f, 0x10a3f,
+ 0x10ae5, 0x10ae6,
+ 0x11001, 0x11001,
+ 0x11038, 0x11046,
+ 0x1107f, 0x11081,
+ 0x110b3, 0x110b6,
+ 0x110b9, 0x110ba,
+ 0x110bd, 0x110bd,
+ 0x11100, 0x11102,
+ 0x11127, 0x1112b,
+ 0x1112d, 0x11134,
+ 0x11173, 0x11173,
+ 0x11180, 0x11181,
+ 0x111b6, 0x111be,
+ 0x111ca, 0x111cc,
+ 0x1122f, 0x11231,
+ 0x11234, 0x11234,
+ 0x11236, 0x11237,
+ 0x1123e, 0x1123e,
+ 0x112df, 0x112df,
+ 0x112e3, 0x112ea,
+ 0x11300, 0x11301,
+ 0x1133c, 0x1133c,
+ 0x11340, 0x11340,
+ 0x11366, 0x1136c,
+ 0x11370, 0x11374,
+ 0x11438, 0x1143f,
+ 0x11442, 0x11444,
+ 0x11446, 0x11446,
+ 0x114b3, 0x114b8,
+ 0x114ba, 0x114ba,
+ 0x114bf, 0x114c0,
+ 0x114c2, 0x114c3,
+ 0x115b2, 0x115b5,
+ 0x115bc, 0x115bd,
+ 0x115bf, 0x115c0,
+ 0x115dc, 0x115dd,
+ 0x11633, 0x1163a,
+ 0x1163d, 0x1163d,
+ 0x1163f, 0x11640,
+ 0x116ab, 0x116ab,
+ 0x116ad, 0x116ad,
+ 0x116b0, 0x116b5,
+ 0x116b7, 0x116b7,
+ 0x1171d, 0x1171f,
+ 0x11722, 0x11725,
+ 0x11727, 0x1172b,
+ 0x11a01, 0x11a06,
+ 0x11a09, 0x11a0a,
+ 0x11a33, 0x11a38,
+ 0x11a3b, 0x11a3e,
+ 0x11a47, 0x11a47,
+ 0x11a51, 0x11a56,
+ 0x11a59, 0x11a5b,
+ 0x11a8a, 0x11a96,
+ 0x11a98, 0x11a99,
+ 0x11c30, 0x11c36,
+ 0x11c38, 0x11c3d,
+ 0x11c3f, 0x11c3f,
+ 0x11c92, 0x11ca7,
+ 0x11caa, 0x11cb0,
+ 0x11cb2, 0x11cb3,
+ 0x11cb5, 0x11cb6,
+ 0x11d31, 0x11d36,
+ 0x11d3a, 0x11d3a,
+ 0x11d3c, 0x11d3d,
+ 0x11d3f, 0x11d45,
+ 0x11d47, 0x11d47,
+ 0x16af0, 0x16af4,
+ 0x16b30, 0x16b36,
+ 0x16f8f, 0x16f92,
+ 0x1bc9d, 0x1bc9e,
+ 0x1bca0, 0x1bca3,
+ 0x1d167, 0x1d169,
+ 0x1d173, 0x1d182,
+ 0x1d185, 0x1d18b,
+ 0x1d1aa, 0x1d1ad,
+ 0x1d242, 0x1d244,
+ 0x1da00, 0x1da36,
+ 0x1da3b, 0x1da6c,
+ 0x1da75, 0x1da75,
+ 0x1da84, 0x1da84,
+ 0x1da9b, 0x1da9f,
+ 0x1daa1, 0x1daaf,
+ 0x1e000, 0x1e006,
+ 0x1e008, 0x1e018,
+ 0x1e01b, 0x1e021,
+ 0x1e023, 0x1e024,
+ 0x1e026, 0x1e02a,
+ 0x1e8d0, 0x1e8d6,
+ 0x1e944, 0x1e94a,
+ 0xe0001, 0xe0001,
+ 0xe0020, 0xe007f,
+ 0xe0100, 0xe01ef,
+]
+
+/*
+ * Generated by
+ *
+ * uniset eaw:W,F - cat:Me,Mn,Cf | \
+ * sed -r 's/^([0-9a-f]+)[.][.]([0-9a-f]+)$/\t0x\1, 0x\2,/' | \
+ * sed -r 's/^([0-9a-f]+)$/\t0x\1, 0x\1,/'
+ */
+const width2 = [
+ 0x1100, 0x115f,
+ 0x231a, 0x231b,
+ 0x2329, 0x232a,
+ 0x23e9, 0x23ec,
+ 0x23f0, 0x23f0,
+ 0x23f3, 0x23f3,
+ 0x25fd, 0x25fe,
+ 0x2614, 0x2615,
+ 0x2648, 0x2653,
+ 0x267f, 0x267f,
+ 0x2693, 0x2693,
+ 0x26a1, 0x26a1,
+ 0x26aa, 0x26ab,
+ 0x26bd, 0x26be,
+ 0x26c4, 0x26c5,
+ 0x26ce, 0x26ce,
+ 0x26d4, 0x26d4,
+ 0x26ea, 0x26ea,
+ 0x26f2, 0x26f3,
+ 0x26f5, 0x26f5,
+ 0x26fa, 0x26fa,
+ 0x26fd, 0x26fd,
+ 0x2705, 0x2705,
+ 0x270a, 0x270b,
+ 0x2728, 0x2728,
+ 0x274c, 0x274c,
+ 0x274e, 0x274e,
+ 0x2753, 0x2755,
+ 0x2757, 0x2757,
+ 0x2795, 0x2797,
+ 0x27b0, 0x27b0,
+ 0x27bf, 0x27bf,
+ 0x2b1b, 0x2b1c,
+ 0x2b50, 0x2b50,
+ 0x2b55, 0x2b55,
+ 0x2e80, 0x2e99,
+ 0x2e9b, 0x2ef3,
+ 0x2f00, 0x2fd5,
+ 0x2ff0, 0x2ffb,
+ 0x3000, 0x3029,
+ 0x302e, 0x303e,
+ 0x3041, 0x3096,
+ 0x309b, 0x30ff,
+ 0x3105, 0x312e,
+ 0x3131, 0x318e,
+ 0x3190, 0x31ba,
+ 0x31c0, 0x31e3,
+ 0x31f0, 0x321e,
+ 0x3220, 0x3247,
+ 0x3250, 0x32fe,
+ 0x3300, 0x4dbf,
+ 0x4e00, 0xa48c,
+ 0xa490, 0xa4c6,
+ 0xa960, 0xa97c,
+ 0xac00, 0xd7a3,
+ 0xf900, 0xfaff,
+ 0xfe10, 0xfe19,
+ 0xfe30, 0xfe52,
+ 0xfe54, 0xfe66,
+ 0xfe68, 0xfe6b,
+ 0xff01, 0xff60,
+ 0xffe0, 0xffe6,
+ 0x16fe0, 0x16fe1,
+ 0x17000, 0x187ec,
+ 0x18800, 0x18af2,
+ 0x1b000, 0x1b11e,
+ 0x1b170, 0x1b2fb,
+ 0x1f004, 0x1f004,
+ 0x1f0cf, 0x1f0cf,
+ 0x1f18e, 0x1f18e,
+ 0x1f191, 0x1f19a,
+ 0x1f200, 0x1f202,
+ 0x1f210, 0x1f23b,
+ 0x1f240, 0x1f248,
+ 0x1f250, 0x1f251,
+ 0x1f260, 0x1f265,
+ 0x1f300, 0x1f320,
+ 0x1f32d, 0x1f335,
+ 0x1f337, 0x1f37c,
+ 0x1f37e, 0x1f393,
+ 0x1f3a0, 0x1f3ca,
+ 0x1f3cf, 0x1f3d3,
+ 0x1f3e0, 0x1f3f0,
+ 0x1f3f4, 0x1f3f4,
+ 0x1f3f8, 0x1f43e,
+ 0x1f440, 0x1f440,
+ 0x1f442, 0x1f4fc,
+ 0x1f4ff, 0x1f53d,
+ 0x1f54b, 0x1f54e,
+ 0x1f550, 0x1f567,
+ 0x1f57a, 0x1f57a,
+ 0x1f595, 0x1f596,
+ 0x1f5a4, 0x1f5a4,
+ 0x1f5fb, 0x1f64f,
+ 0x1f680, 0x1f6c5,
+ 0x1f6cc, 0x1f6cc,
+ 0x1f6d0, 0x1f6d2,
+ 0x1f6eb, 0x1f6ec,
+ 0x1f6f4, 0x1f6f8,
+ 0x1f910, 0x1f93e,
+ 0x1f940, 0x1f94c,
+ 0x1f950, 0x1f96b,
+ 0x1f980, 0x1f997,
+ 0x1f9c0, 0x1f9c0,
+ 0x1f9d0, 0x1f9e6,
+ 0x20000, 0x2fffd,
+ 0x30000, 0x3fffd,
+]
+
const findc = {c, t, n, nelt, ret
var p, m
@@ -1245,3 +1686,32 @@ generic charval = {c, base -> @a::(numeric,integral)
;;
-> v
}
+
+const cellwidth = { c : char
+ var l
+ /*
+ * Follows the general idea described at
+ * http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+ */
+ if c == 0
+ -> 0
+ ;;
+
+ if c == -1 || c < 0x20 || (c >= 0x7f && c <= 0x9f)
+ -> -1
+ ;;
+
+ if findc(c, width0[:], width0.len/2, 2, &l)
+ if (c >= l[0] && c <= l[1])
+ -> 0
+ ;;
+ ;;
+
+ if findc(c, width2[:], width2.len/2, 2, &l)
+ if (c >= l[0] && c <= l[1])
+ -> 2
+ ;;
+ ;;
+
+ -> 1
+}
diff --git a/lib/std/fmt.myr b/lib/std/fmt.myr
index 08b814d..1f542d3 100644
--- a/lib/std/fmt.myr
+++ b/lib/std/fmt.myr
@@ -553,7 +553,7 @@ const strfmt = {sb, str, params
;;
;;
else
- for i = 0; i < w - graphemewidth(str); i++
+ for i = 0; i < w - strcellwidth(str); i++
sbputc(sb, p)
;;
sbputs(sb, str)
@@ -564,14 +564,6 @@ const isprint = {b
-> b >= (' ' : byte) && b < ('~' : byte)
}
-/*
-Hah. like we're going to put in the work to actually
-count graphemes.
-*/
-const graphemewidth = {str
- -> str.len
-}
-
const digitchars = [
'0','1','2','3','4',
'5','6','7','8','9',
diff --git a/lib/std/test/chartype.myr b/lib/std/test/chartype.myr
index d0df1d2..30426e6 100644
--- a/lib/std/test/chartype.myr
+++ b/lib/std/test/chartype.myr
@@ -20,4 +20,22 @@ const main = {
std.assert(!std.isalnum('!'), "! should not be isalnum\n")
std.assert(!std.isspace('@'), "@ should not be isspace\n")
std.assert(!std.isblank('@'), "@ should not be isblank\n")
+
+ std.assert(std.cellwidth(std.Badchar) == -1, "Badchar should have width -1\n")
+ std.assert(std.cellwidth((0 : char)) == 0, "U+0000 should have width 0\n")
+ std.assert(std.cellwidth('') == -1, "^E should have width -1\n")
+ std.assert(std.cellwidth('a') == 1, "'a' should have width 1\n")
+ std.assert(std.cellwidth('ê') == 1, "'ê' should have width 1\n")
+ std.assert(std.cellwidth('̀') == 0, "U+300 should have width 0\n")
+ std.assert(std.cellwidth('ϼ') == 1, "ϼ should have width 1\n")
+ std.assert(std.cellwidth('Ї') == 1, "Ї should have width 1\n")
+ std.assert(std.cellwidth('⊲') == 1, "⊲ should have width 1\n")
+ std.assert(std.cellwidth(' ') == 2, "U+3000 should have width 2\n")
+ std.assert(std.cellwidth('ギ') == 2, "ギ should have width 2\n")
+ std.assert(std.cellwidth('匌') == 2, "匌 should have width 2\n")
+ std.assert(std.cellwidth('­') == 0, "U+00AD should have width 0\n")
+ std.assert(std.cellwidth('ࠠ') == 0, "U+820 should have width 0\n")
+ std.assert(std.cellwidth('־') == 1, "U+5BE should have width 1\n")
+ std.assert(std.cellwidth('ֿ') == 0, "U+5BF should have width 0\n")
+ std.assert(std.cellwidth('׀') == 1, "U+5C0 should have width 1\n")
}
diff --git a/lib/std/test/fmt.myr b/lib/std/test/fmt.myr
index 5d0cfa8..c1a17ac 100644
--- a/lib/std/test/fmt.myr
+++ b/lib/std/test/fmt.myr
@@ -56,6 +56,10 @@ const builtins = {
check("\\n\\r\\xff", "{e}", "\n\r\xff")
check("{}barbaz", "{{}}bar{}", "baz")
check("{barbaz}", "{{bar{}}}", "baz")
+ check(" Tlön", "{w=10}", "Tlön")
+ check(" háček", "{w=10}", "háček")
+ check("_____即是多多即", "{w=15,p=_}", "即是多多即")
+ check(" τῶν ῾Ελλήνων", "{w=15}", "τῶν ῾Ελλήνων")
check("abcd", "{}", "abcd")
check("123", "{}", 123)
check("7b", "{x}", 123)
diff --git a/lib/std/test/utf.myr b/lib/std/test/utf.myr
new file mode 100644
index 0000000..4ac25d7
--- /dev/null
+++ b/lib/std/test/utf.myr
Binary files differ
diff --git a/lib/std/utf.myr b/lib/std/utf.myr
index 6c655a3..439254c 100644
--- a/lib/std/utf.myr
+++ b/lib/std/utf.myr
@@ -1,3 +1,5 @@
+use "extremum"
+use "chartype"
use "die"
use "types"
@@ -12,6 +14,7 @@ pkg std =
const decode : (buf : byte[:] -> char)
const strstep : (str : byte[:] -> (char, byte[:]))
+ const strcellwidth : (str : byte[:] -> size)
;;
const charlen = {c
@@ -101,3 +104,29 @@ const strstep = {str
-> ((chr : char), str[len:])
}
+
+const strcellwidth = {str
+ var s : byte[:] = str
+ var c : char = Badchar
+ var n : size = 0
+
+ while s.len > 0
+ (c, s) = strstep(s)
+ if c == Badchar
+ /* Something will probably be printed as U+FFFD */
+ n++
+ elif c < 0x20
+ /* Control characters take 0 cells */
+ elif c < 0x7f
+ /* Bog standard ASCII takes 1 cell */
+ n++
+ elif c == 0x7f
+ /* DEL is like a control character */
+ else
+ /* It's not ASCII, so ask chartype what to do */
+ n += (abs(cellwidth(c)) : size)
+ ;;
+ ;;
+
+ -> n
+}