xC: respect text formatting when autosplitting
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5
NEWS
5
NEWS
@ -1,3 +1,8 @@
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1.4.0 (xxxx-xx-xx)
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* xC: made message autosplitting respect text formatting
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1.3.0 (2021-08-07) "New World Order"
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* xC: made nick autocompletion offer recent speakers first
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157
xC.c
157
xC.c
@ -2797,7 +2797,8 @@ enum
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TEXT_UNDERLINE = 1 << 2,
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TEXT_INVERSE = 1 << 3,
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TEXT_BLINK = 1 << 4,
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TEXT_CROSSED_OUT = 1 << 5
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TEXT_CROSSED_OUT = 1 << 5,
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TEXT_MONOSPACE = 1 << 6
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};
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struct attr_printer
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@ -8227,12 +8228,99 @@ irc_process_message (const struct irc_message *msg, struct server *s)
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// --- Message autosplitting magic ---------------------------------------------
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// This is the most basic acceptable algorithm; something like ICU with proper
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// This is a rather basic algorithm; something like ICU with proper
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// locale specification would be needed to make it work better.
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struct irc_char_attrs
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{
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uint8_t fg, bg; ///< {Fore,back}ground colour or 99
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uint8_t attributes; ///< TEXT_* flags, except TEXT_BLINK
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uint8_t starts_at_boundary; ///< Possible to split here?
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};
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static void
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irc_serialize_char_attrs (const struct irc_char_attrs *attrs, struct str *out)
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{
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soft_assert (attrs->fg < 100 && attrs->bg < 100);
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if (attrs->fg != 99 || attrs->bg != 99)
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{
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str_append_printf (out, "\x03%u", attrs->fg);
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if (attrs->bg != 99)
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str_append_printf (out, ",%02u", attrs->bg);
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}
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if (attrs->attributes & TEXT_BOLD) str_append_c (out, '\x02');
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if (attrs->attributes & TEXT_ITALIC) str_append_c (out, '\x1d');
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if (attrs->attributes & TEXT_UNDERLINE) str_append_c (out, '\x1f');
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if (attrs->attributes & TEXT_INVERSE) str_append_c (out, '\x16');
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if (attrs->attributes & TEXT_CROSSED_OUT) str_append_c (out, '\x1e');
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if (attrs->attributes & TEXT_MONOSPACE) str_append_c (out, '\x11');
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}
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static const char *
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irc_analyze_mirc_color (const char *s, uint8_t *fg, uint8_t *bg)
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{
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if (!isdigit_ascii (*s))
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{
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*fg = *bg = 99;
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return s;
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}
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*fg = *s++ - '0';
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if (isdigit_ascii (*s))
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*fg = *fg * 10 + (*s++ - '0');
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if (*s != ',' || !isdigit_ascii (s[1]))
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return s;
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s++;
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*bg = *s++ - '0';
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if (isdigit_ascii (*s))
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*bg = *bg * 10 + (*s++ - '0');
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return s;
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}
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// The text needs to be NUL-terminated
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// TODO: try to deduplicate analogous code in formatter_parse_mirc()
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static struct irc_char_attrs *
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irc_analyze_text (const char *text, size_t len)
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{
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struct irc_char_attrs *attrs = xcalloc (len, sizeof *attrs),
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blank = { .fg = 99, .bg = 99, .starts_at_boundary = true },
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next = blank, cur = next;
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for (size_t i = 0; i != len; cur = next)
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{
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const char *start = text;
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hard_assert (utf8_decode (&text, len - i) >= 0);
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switch (*start)
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{
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case '\x02': next.attributes ^= TEXT_BOLD; break;
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case '\x11': next.attributes ^= TEXT_MONOSPACE; break;
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case '\x1d': next.attributes ^= TEXT_ITALIC; break;
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case '\x1e': next.attributes ^= TEXT_CROSSED_OUT; break;
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case '\x1f': next.attributes ^= TEXT_UNDERLINE; break;
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case '\x16': next.attributes ^= TEXT_INVERSE; break;
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case '\x03':
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text = irc_analyze_mirc_color (text, &next.fg, &next.bg);
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break;
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case '\x0f':
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next = blank;
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}
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while (start++ != text)
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{
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attrs[i++] = cur;
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cur.starts_at_boundary = false;
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}
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}
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return attrs;
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}
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static size_t
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wrap_text_for_single_line (const char *text, size_t text_len,
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size_t line_len, struct str *output)
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wrap_text_for_single_line (const char *text, struct irc_char_attrs *attrs,
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size_t text_len, size_t target_len, struct str *output)
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{
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size_t eaten = 0;
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@ -8240,7 +8328,7 @@ wrap_text_for_single_line (const char *text, size_t text_len,
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const char *word_start;
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const char *word_end = text + strcspn (text, " ");
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size_t word_len = word_end - text;
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while (line_len && word_len <= line_len)
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while (target_len && word_len <= target_len)
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{
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if (word_len)
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{
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@ -8248,7 +8336,7 @@ wrap_text_for_single_line (const char *text, size_t text_len,
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text += word_len;
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eaten += word_len;
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line_len -= word_len;
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target_len -= word_len;
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}
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// Find the next word's end
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@ -8262,53 +8350,62 @@ wrap_text_for_single_line (const char *text, size_t text_len,
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return eaten + (word_start - text);
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// And if that doesn't help, cut the longest valid block of characters
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for (const char *p = text; (size_t) (p - text) <= line_len; )
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{
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eaten = p - text;
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hard_assert (utf8_decode (&p, text_len - eaten) >= 0);
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}
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for (size_t i = 1; i <= text_len && i <= target_len; i++)
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if (i == text_len || attrs[i].starts_at_boundary)
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eaten = i;
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str_append_data (output, text, eaten);
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return eaten;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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// In practice, this should never fail at all, although it's not guaranteed
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static bool
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wrap_message (const char *message,
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int line_max, struct strv *output, struct error **e)
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{
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size_t message_left = strlen (message), i = 0;
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struct irc_char_attrs *attrs = irc_analyze_text (message, message_left);
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struct str m = str_make ();
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if (line_max <= 0)
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goto error;
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int message_left = strlen (message);
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while (message_left > line_max)
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while (m.len + message_left > (size_t) line_max)
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{
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struct str m = str_make ();
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size_t eaten = wrap_text_for_single_line
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(message, message_left, line_max, &m);
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(message + i, attrs + i, message_left, line_max - m.len, &m);
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if (!eaten)
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{
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str_free (&m);
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goto error;
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}
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strv_append_owned (output, str_steal (&m));
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message += eaten;
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message_left -= eaten;
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m = str_make ();
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i += eaten;
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if (!(message_left -= eaten))
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break;
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irc_serialize_char_attrs (attrs + i, &m);
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if (m.len >= (size_t) line_max)
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{
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print_debug ("formatting continuation too long");
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str_reset (&m);
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}
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}
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if (message_left)
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strv_append (output, message);
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strv_append_owned (output,
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xstrdup_printf ("%s%s", m.str, message + i));
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free (attrs);
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str_free (&m);
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return true;
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error:
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// Well, that's just weird
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error_set (e,
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free (attrs);
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str_free (&m);
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return error_set (e,
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"Message splitting was unsuccessful as there was "
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"too little room for UTF-8 characters");
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return false;
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}
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/// Automatically splits messages that arrive at other clients with our prefix
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@ -14303,9 +14400,11 @@ test_aliases (void)
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static void
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test_wrapping (void)
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{
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static const char *message = " foo bar foobar fóóbárbáz";
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static const char *split[] =
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{ " foo", "bar", "foob", "ar", "fó", "ób", "árb", "áz" };
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static const char *message = " foo bar foobar fóóbárbáz\002 a\0031 b";
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// XXX: formatting continuation order is implementation-dependent here
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// (irc_serialize_char_attrs() makes a choice in serialization)
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static const char *split[] = { " foo", "bar", "foob", "ar",
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"fó", "ób", "árb", "áz\x02", "\002a\0031", "\0031\002b" };
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struct strv v = strv_make ();
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hard_assert (wrap_message (message, 4, &v, NULL));
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