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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <wchar.h>
#include "chat.h"
// Adapted from <https://github.com/cbreeden/fxhash/blob/master/lib.rs>.
static uint32_t hashChar(uint32_t hash, char ch) {
hash = (hash << 5) | (hash >> 27);
hash ^= ch;
hash *= 0x27220A95;
return hash;
}
enum IRCColor formatColor(const char *str) {
if (!str) return IRCDefault;
uint32_t hash = 0;
for (; str[0]; ++str) {
hash = hashChar(hash, str[0]);
}
while (IRCBlack == (hash & IRCLightGray)) {
hash = hashChar(hash, '\0');
}
return (hash & IRCLightGray);
}
void formatReset(struct Format *format) {
format->bold = false;
format->italic = false;
format->underline = false;
format->reverse = false;
format->fg = IRCDefault;
format->bg = IRCDefault;
}
static void parseColor(struct Format *format) {
size_t len = MIN(wcsspn(format->str, L"0123456789"), 2);
if (!len) {
format->fg = IRCDefault;
format->bg = IRCDefault;
return;
}
format->fg = 0;
for (size_t i = 0; i < len; ++i) {
format->fg *= 10;
format->fg += format->str[i] - L'0';
}
if (format->fg > IRCLightGray) format->fg = IRCDefault;
format->str = &format->str[len];
len = 0;
if (format->str[0] == L',') {
len = MIN(wcsspn(&format->str[1], L"0123456789"), 2);
}
if (!len) return;
format->bg = 0;
for (size_t i = 0; i < len; ++i) {
format->bg *= 10;
format->bg += format->str[1 + i] - L'0';
}
if (format->bg > IRCLightGray) format->bg = IRCDefault;
format->str = &format->str[1 + len];
}
static const wchar_t Stops[] = {
L' ',
IRCBold, IRCColor, IRCReverse, IRCReset, IRCItalic, IRCUnderline,
L'\0',
};
bool formatParse(struct Format *format, const wchar_t *split) {
format->str += format->len;
if (!format->str[0]) {
if (split == format->str && !format->split) {
format->len = 0;
format->split = true;
return true;
}
return false;
}
const wchar_t *init = format->str;
for (bool done = false; !done;) {
switch (format->str[0]) {
break; case IRCBold: format->str++; format->bold ^= true;
break; case IRCItalic: format->str++; format->italic ^= true;
break; case IRCUnderline: format->str++; format->underline ^= true;
break; case IRCReverse: format->str++; format->reverse ^= true;
break; case IRCColor: format->str++; parseColor(format);
break; case IRCReset: format->str++; formatReset(format);
break; default: done = true;
}
}
format->split = (split >= init && split <= format->str);
if (format->str[0] == L' ') {
format->len = 1 + wcscspn(&format->str[1], Stops);
} else {
format->len = wcscspn(format->str, Stops);
}
if (split > format->str && split < &format->str[format->len]) {
format->len = split - format->str;
}
return true;
}
#ifdef TEST
#include <assert.h>
static bool testColor(
const wchar_t *str, enum IRCColor fg, enum IRCColor bg, size_t index
) {
struct Format format = { .str = str };
formatReset(&format);
if (!formatParse(&format, NULL)) return false;
if (format.fg != fg) return false;
if (format.bg != bg) return false;
return (format.str == &str[index]);
}
static bool testSplit(const wchar_t *str, size_t index) {
struct Format format = { .str = str };
formatReset(&format);
bool split = false;
while (formatParse(&format, &str[index])) {
if (format.split && split) return false;
if (format.split) split = true;
}
return split;
}
static bool testSplits(const wchar_t *str) {
for (size_t i = 0; i <= wcslen(str); ++i) {
if (!testSplit(str, i)) return false;
}
return true;
}
int main() {
assert(testColor(L"\003a", IRCDefault, IRCDefault, 1));
assert(testColor(L"\003,a", IRCDefault, IRCDefault, 1));
assert(testColor(L"\003,1", IRCDefault, IRCDefault, 1));
assert(testColor(L"\0031a", IRCBlack, IRCDefault, 2));
assert(testColor(L"\0031,a", IRCBlack, IRCDefault, 2));
assert(testColor(L"\00312a", IRCLightBlue, IRCDefault, 3));
assert(testColor(L"\00312,a", IRCLightBlue, IRCDefault, 3));
assert(testColor(L"\003123", IRCLightBlue, IRCDefault, 3));
assert(testColor(L"\0031,1a", IRCBlack, IRCBlack, 4));
assert(testColor(L"\0031,12a", IRCBlack, IRCLightBlue, 5));
assert(testColor(L"\0031,123", IRCBlack, IRCLightBlue, 5));
assert(testColor(L"\00312,1a", IRCLightBlue, IRCBlack, 5));
assert(testColor(L"\00312,12a", IRCLightBlue, IRCLightBlue, 6));
assert(testColor(L"\00312,123", IRCLightBlue, IRCLightBlue, 6));
assert(testColor(L"\00316,16a", IRCDefault, IRCDefault, 6));
assert(testColor(L"\00399,99a", IRCDefault, IRCDefault, 6));
assert(testSplits(L"ab"));
assert(testSplits(L"\002"));
assert(testSplits(L"\002ab"));
assert(testSplits(L"a\002b"));
assert(testSplits(L"\002\003"));
assert(testSplits(L"a\002\003b"));
assert(testSplits(L"a\0031b"));
assert(testSplits(L"a\00312b"));
assert(testSplits(L"a\00312,1b"));
assert(testSplits(L"a\00312,12b"));
}
#endif
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