122 lines
4.8 KiB
C
122 lines
4.8 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/errno.h"
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#include "libc/stdio/stdio.h"
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/**
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@fileoverview Converts ASCII combining marks to UNICODE.
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Getting started:
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nroff -mandoc -rLL=72n -rLT=78n -Tutf8 <manpage.1 |
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tool/viz/ascii2utf8.com
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ASCII Bold:
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- CHAR BACKSPACE CHAR c ++ "\b" ++ c
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e.g. AABBCCDD 410841 420842 430843 440844
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ASCII Underlines:
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- CHAR BACKSPACE LOW LINE c ++ "\b_"
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e.g. A_B_C_D_ 41085F 42085F 43085F 44085F
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UNICODE Underlines:
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- COMBINING LOW LINE U+0332 (\xCC\xB1)
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e.g. A̲B̲C̲D̲ (ugly notches) 41CCB2 42CCB2 43CCB2 44CCB2
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- COMBINING MACRON BELOW U+0331 (\xCC\xB1)
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e.g. A̱ḆC̱Ḏ (too short) 41CCB1 42CCB1 43CCB1 44CCB1
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- COMBINING DOUBLE MACRON BELOW U+035F (\xCD\x9F)
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e.g. A͟B͟C͟D͟ (too long) 41CD9F 42CD9F 43CD9F 44CD9F
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- DOUBLE PLUS COMBINING MACRON BELOW 3×U+035F + 1×U+0331
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e.g. A͟B͟C͟Ḏ (too narrow) 41CCB1 42CCB1 43CCB1 44CD9F
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- DOUBLE PLUS COMBINING MACRON LOW LINE [it's complicated]
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e.g. A͟B͟C͟D̲ (𝑓𝑙𝑎𝑤𝑙𝑒𝑠𝑠) 41CD9F 42CD9F 43CD9F 44CCB2
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*/
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const wint_t kBackspace = '\b';
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const wint_t kCombiningLowLine = L'\u0332';
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const wint_t kCombiningDoubleMacronBelow = L'\u035f';
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forceinline int PutChar(wint_t (*buf)[3], size_t *i, wint_t *cc, FILE *out) {
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if (fputwc((*buf)[0], out) == -1) return -1;
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if (*cc != -1) {
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if (fputwc(*cc, out) == -1) return -1;
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*cc = -1;
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}
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(*buf)[0] = (*buf)[1];
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(*buf)[1] = (*buf)[2];
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--*i;
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return 0;
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}
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int CombineAsciiMarks(FILE *in, FILE *out) {
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wint_t buf[3], wc = 0, cc = -1;
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size_t i = 0;
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for (;;) {
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while (i < 3) {
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if ((wc = fgetwc(in)) == -1) goto InputBreak;
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buf[i++] = wc;
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}
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if (buf[1] == '\b' && cc == -1) {
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if (buf[0] == buf[2]) { /* bold */
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if (L'0' <= buf[0] && buf[0] <= L'9') {
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buf[0] = L'𝟬' + (buf[0] - L'0');
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i = 1;
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} else if (L'A' <= buf[0] && buf[0] <= L'Z') {
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buf[0] = L'𝐀' + (buf[0] - L'A');
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i = 1;
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} else if ('a' <= buf[0] && buf[0] <= L'z') {
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buf[0] = L'𝗮' + (buf[0] - L'a');
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i = 1;
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} else {
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i = 1;
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}
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} else if (buf[2] == '_') { /* underline */
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cc = kCombiningLowLine;
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i = 1;
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} else if (buf[0] == '_') {
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cc = kCombiningLowLine;
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buf[0] = buf[2];
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i = 1;
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}
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}
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if (i == 3) {
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if (PutChar(&buf, &i, &cc, out) == -1) goto OutputBreak;
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}
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}
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InputBreak:
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while (i) {
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if (PutChar(&buf, &i, &cc, out) == -1) goto OutputBreak;
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}
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OutputBreak:
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return (fclose(in) | fclose(out)) != -1 ? 0 : -1;
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}
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int main(int argc, char *argv[]) {
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return CombineAsciiMarks(stdin, stdout) != -1 ? 0 : errno;
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}
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