diff --git a/src/interpret.c.re b/src/interpret.c.re
index 015cc31..477a55c 100644
--- a/src/interpret.c.re
+++ b/src/interpret.c.re
@@ -23,26 +23,37 @@ static int parse_uint(const char *s, const char *e, unsigned *u) {
     return 1;
 }
 
+static int parse_double(const char *s0, const char *s1, double *d) {
+	char *finish;
+	assert(d && s0 && s0 < s1);
+	*d = strtod(s0, &finish);
+	return !errno && ((finish == s1) || (errno = EDOM, 0));
+}
+
 static int lex_line(const char *YYCURSOR, unsigned *const u) {
 	const char *YYMARKER, *o1, *o2, *o3, *o4;
+	double d;
 	/*!stags:re2c format = 'const char *@@;\n'; */
-
 	/*!re2c
 	re2c:yyfill:enable = 0;
 	re2c:flags:tags = 1;
 	re2c:define:YYCTYPE = char;
 
+	keyword = [a-z][a-z0-9_-]{0,64}; // uppercase is lame
 	octet = [0-9] | [1-9][0-9] | [1][0-9][0-9] | [2][0-4][0-9] | [2][5][0-5];
 	dot = [.];
 	end = [\x00];
 
 	eol = [\n];
 	w = [ \t]*;
-
-	glider = "{" "glider" ":";
-	flight = "{" "}";
-
-
+	double = [0-9]* "." [0-9]+ | [0-9]+;
+	*/
+	errno = 0; /* For accuracy detecting errors. */
+text:
+	/*!re2c
+	"\\[" | "\\![" { goto text; }
+	"[" { goto custom; }
+	"![" { goto image; }
 	@o1 octet dot @o2 octet dot @o3 octet dot @o4 octet end {
 		unsigned u1, u2, u3, u4;
 		if(!parse_uint(o1, o2 - 1, &u1)
@@ -52,16 +63,36 @@ static int lex_line(const char *YYCURSOR, unsigned *const u) {
 		*u = u4 + (u3 << 8) + (u2 << 16) + (u1 << 24);
 		return 1;
 	}
-	* { return 0; }
+	* { return errno = EILSEQ, 0; }
+	*/
+image:
+	/*!re2c
+	"osm" "](" @o1 double @o2 "," @o3 double @o4 ")" {
+		printf("Got a map.\n");
+		if(!parse_double(o1, o2, &d)) return 0;
+		printf("Latitude %f.\n", d);
+		if(!parse_double(o3, o4, &d)) return 0;
+		printf("Longitude %f.\n", d);
+		goto text;
+	}
+	* { return errno = EILSEQ, 0; }
+	*/
+custom:
+	/*!re2c
+	glider = "glider" ":" ;
+	flight = "flight" ":" ;
+	* { return errno = EILSEQ, 0; }
 	*/
 }
 
 
 int main(int argc, char **argv) {
 	unsigned u;
-	int success;
-	success = lex_line("1.2.3.4", &u);
-	assert(success);
-	printf("%x\n", u);
+	if(!lex_line("1.2.3.4", &u)) goto catch;
+	printf("0x%x\n", u);
+	if(!lex_line("1.2.3.49999999999999999", &u)) goto catch;
 	return EXIT_SUCCESS;
+catch:
+	perror("interpret");
+	return EXIT_FAILURE;
 }