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/* Copyright (C) 2019 C. 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 <stdint.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 colorGen(const char *str) {
if (!str) return IRCDefault;
uint32_t hash = 0;
if (*str == '~') str++;
for (; *str; ++str) {
hash = hashChar(hash, *str);
}
while (IRCBlack == (hash & IRCLightGray)) {
hash = hashChar(hash, '\0');
}
return (hash & IRCLightGray);
}
static enum IRCColor colors[TagsLen];
struct Tag colorTag(struct Tag tag, const char *gen) {
if (!colors[tag.id]) colors[tag.id] = 1 + colorGen(gen);
return tag;
}
enum IRCColor colorFor(struct Tag tag) {
return colors[tag.id] ? colors[tag.id] - 1 : IRCDefault;
}
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