Factor out IRC formatting parsing

Makefile

@@ -12,6 +12,7 @@ LDLIBS = -lcursesw -ltls
 OBJS += chat.o
 OBJS += edit.o
 OBJS += event.o
+OBJS += format.o
 OBJS += handle.o
 OBJS += input.o
 OBJS += irc.o

README

@@ -9,7 +9,8 @@ This software requires LibreSSL and targets FreeBSD and Darwin.
 	handle.c    Incoming command handling
 	input.c     Input command handling
 	irc.c       TLS client connection
-	ui.c        Curses UI and mIRC formatting
+	format.c    IRC formatting
+	ui.c        Curses UI
 	term.c      Terminal features unsupported by curses
 	edit.c      Line editing
 	tab.c       Tab-complete

chat.h

@@ -23,6 +23,9 @@
 #include <time.h>
 #include <wchar.h>
 
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
 #define err(...) do { uiHide(); err(__VA_ARGS__); } while (0)
 #define errx(...) do { uiHide(); errx(__VA_ARGS__); } while (0)
 
@@ -80,6 +83,19 @@ enum {
 	IRCUnderline = 037,
 };
 
+struct Format {
+	const wchar_t *str;
+	size_t len;
+	bool bold;
+	bool italic;
+	bool underline;
+	bool reverse;
+	int fg;
+	int bg;
+};
+void formatReset(struct Format *format);
+bool formatParse(struct Format *format, const wchar_t *stop);
+
 void handle(char *line);
 void input(struct Tag tag, char *line);
 void inputTab(void);

format.c

@@ -0,0 +1,89 @@
+/* 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 <wchar.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include "chat.h"
+
+void formatReset(struct Format *format) {
+	format->bold = false;
+	format->italic = false;
+	format->underline = false;
+	format->reverse = false;
+	format->fg = -1;
+	format->bg = -1;
+}
+
+static void parseColor(struct Format *format) {
+	size_t len = MIN(wcsspn(format->str, L"0123456789"), 2);
+	if (!len) {
+		format->fg = -1;
+		format->bg = -1;
+		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 = -1;
+	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 = -1;
+	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 *stop) {
+	format->str += format->len;
+	if (!format->str[0]) return false;
+
+	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);
+	}
+
+	if (format->str[0] == L' ') {
+		format->len = 1 + wcscspn(&format->str[1], Stops);
+	} else {
+		format->len = wcscspn(format->str, Stops);
+	}
+	if (stop && stop > format->str && stop < &format->str[format->len]) {
+		format->len = stop - format->str;
+	}
+	return true;
+}

ui.c

@@ -34,9 +34,6 @@
 #include "chat.h"
 #undef uiFmt
 
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-#define MAX(a, b) ((a) > (b) ? (a) : (b))
-
 #define CTRL(c)   ((c) ^ 0100)
 
 static void colorInit(void) {
@@ -242,81 +239,35 @@ static const short IRCColors[] = {
 	[IRCLightGray]  = 0 + COLOR_WHITE,
 };
 
-static const wchar_t *parseColor(short *pair, const wchar_t *str) {
+static int addIRC(WINDOW *win, const wchar_t *str) {
-	short fg = 0;
+	int lines = 0;
-	size_t fgLen = MIN(wcsspn(str, L"0123456789"), 2);
+	struct Format format = { .str = str };
-	if (!fgLen) { *pair = -1; return str; }
+	formatReset(&format);
-	for (size_t i = 0; i < fgLen; ++i) {
+	while (formatParse(&format, NULL)) {
-		fg = fg * 10 + (str[i] - L'0');
-	}
-	str = &str[fgLen];
-
-	short bg = 0;
-	size_t bgLen = 0;
-	if (str[0] == L',') bgLen = MIN(wcsspn(&str[1], L"0123456789"), 2);
-	for (size_t i = 0; i < bgLen; ++i) {
-		bg = bg * 10 + (str[1 + i] - L'0');
-	}
-	if (bgLen) str = &str[1 + bgLen];
-
-	if (*pair == -1) *pair = 0;
-	*pair = (*pair & 0xF0) | IRCColors[fg & 0x0F];
-	if (bgLen) *pair = (*pair & 0x0F) | (IRCColors[bg & 0x0F] << 4);
-
-	return str;
-}
-
-static int wordWrap(WINDOW *win, const wchar_t *str) {
-	size_t len = wcscspn(str, L" ");
-	size_t width = 1;
-	for (size_t i = 0; i < len; ++i) {
-		if (iswprint(str[i])) width += wcwidth(str[i]);
-	}
-
 		int _, x, xMax;
 		getyx(win, _, x);
 		getmaxyx(win, _, xMax);
-
+		if (xMax - x - 1 < wcswidth(format.str, format.len)) {
-	if (width >= (size_t)(xMax - x)) {
+			if (format.str[0] == L' ') {
+				format.str++;
+				format.len--;
+			}
 			waddch(win, '\n');
-		return 1;
+			lines++;
-	} else {
-		waddch(win, ' ');
-		return 0;
 		}
-}
 
-static const wchar_t IRCCodes[] = {
-	L' ',
-	IRCBold,
-	IRCColor,
-	IRCReverse,
-	IRCReset,
-	IRCItalic,
-	IRCUnderline,
-	L'\0',
-};
-
-static int addIRC(WINDOW *win, const wchar_t *str) {
 		attr_t attr = A_NORMAL;
-	short pair = -1;
+		if (format.bold)      attr |= A_BOLD;
-	int lines = 0;
+		if (format.italic)    attr |= A_ITALIC;
-	for (;;) {
+		if (format.underline) attr |= A_UNDERLINE;
-		size_t cc = wcscspn(str, IRCCodes);
+		if (format.reverse)   attr |= A_REVERSE;
-		wattr_set(win, attr | attr8(pair), 1 + pair8(pair), NULL);
-		waddnwstr(win, str, cc);
-		if (!str[cc]) break;
 
-		str = &str[cc];
+		short pair = -1;
-		switch (*str++) {
+		if (format.fg >= 0) pair = IRCColors[format.fg];
-			break; case L' ':         lines += wordWrap(win, str);
+		if (format.bg >= 0) pair |= IRCColors[format.bg] << 4;
-			break; case IRCBold:      attr ^= A_BOLD;
+
-			break; case IRCItalic:    attr ^= A_ITALIC;
+		wattr_set(win, attr | attr8(pair), 1 + pair8(pair), NULL);
-			break; case IRCUnderline: attr ^= A_UNDERLINE;
+		waddnwstr(win, format.str, format.len);
-			break; case IRCReverse:   attr ^= A_REVERSE;
-			break; case IRCColor:     str = parseColor(&pair, str);
-			break; case IRCReset:     attr = A_NORMAL; pair = -1;
-		}
 	}
 	return lines;
 }