Introduce some helper functions dealing with Filerange

5 files changed, 36 insertions, 21 deletions

diff --git a/text-objects.c b/text-objects.c
index f4ff1f2..e1c53d3 100644
--- a/text-objects.c
+++ b/text-objects.c
@@ -18,17 +18,12 @@
 #include "text-objects.h"
 #include "util.h"
 
-static Filerange empty = {
-	.start = -1,
-	.end = -1,
-};
-
 Filerange text_object_word(Text *txt, size_t pos) {
 	Filerange r;
 	char c, prev = '0', next = '0';
 	Iterator it = text_iterator_get(txt, pos);
 	if (!text_iterator_byte_get(&it, &c))
-		return empty;
+		return text_range_empty();
 	if (text_iterator_byte_prev(&it, &prev))
 		text_iterator_byte_next(&it, NULL);
 	text_iterator_byte_next(&it, &next);
@@ -86,6 +81,7 @@ Filerange text_object_paragraph(Text *txt, size_t pos) {
 static Filerange text_object_bracket(Text *txt, size_t pos, char type) {
 	char c, open, close;
 	int opened = 1, closed = 1;
+	Filerange r = text_range_empty();
 
 	switch (type) {
 	case '(':  case ')': open = '(';  close = ')';  break;
@@ -95,10 +91,9 @@ static Filerange text_object_bracket(Text *txt, size_t pos, char type) {
 	case '"':            open = '"';  close = '"';  break;
 	case '`':            open = '`';  close = '`';  break;
 	case '\'':           open = '\''; close = '\''; break;
-	default: return empty;
+	default: return r;
 	}
 
-	Filerange r = empty;
 	Iterator it = text_iterator_get(txt, pos);
 
 	if (open == close && text_iterator_byte_get(&it, &c) && (c == '"' || c == '`' || c == '\'')) {
@@ -129,8 +124,8 @@ static Filerange text_object_bracket(Text *txt, size_t pos, char type) {
 		text_iterator_byte_next(&it, NULL);
 	}
 
-	if (r.start == (size_t)-1 || r.end == (size_t)-1 || r.start > r.end)
-		return empty;
+	if (!text_range_valid(&r))
+		return text_range_empty();
 	return r;
 }
 
diff --git a/text.c b/text.c
index 7cdfd03..3b73a62 100644
--- a/text.c
+++ b/text.c
@@ -1111,3 +1111,22 @@ int text_search_range_backward(Text *txt, size_t pos, size_t len, Regex *r, size
 	free(buf);
 	return ret;
 }
+
+bool text_range_valid(Filerange *r) {
+	return r->start != EPOS && r->end != EPOS && r->start <= r->end;
+}
+
+Filerange text_range_empty(void) {
+	return (Filerange){ .start = EPOS, .end = EPOS };
+}
+
+Filerange text_range_union(Filerange *r1, Filerange *r2) {
+	if (!text_range_valid(r1))
+		return *r2;
+	if (!text_range_valid(r2))
+		return *r1;
+	return (Filerange) {
+		.start = MIN(r1->start, r2->start),
+		.end = MAX(r1->end, r2->end),
+	};
+}
diff --git a/text.h b/text.h
index 2343085..4f7c4dc 100644
--- a/text.h
+++ b/text.h
@@ -12,6 +12,10 @@ typedef struct {
 	size_t start, end;        /* range in bytes from start of the file */
 } Filerange;
 
+bool text_range_valid(Filerange*);
+Filerange text_range_empty(void);
+Filerange text_range_union(Filerange*, Filerange*);
+
 typedef struct Text Text;
 typedef struct Piece Piece;
 
diff --git a/vis.c b/vis.c
index a52fe9d..7e75dbc 100644
--- a/vis.c
+++ b/vis.c
@@ -831,16 +831,15 @@ static void action_do(Action *a) {
 		c.range.start = c.range.end = pos;
 		for (int i = 0; i < a->count; i++) {
 			r = a->textobj->range(txt, pos);
-			// TODO range_valid?
-			if (r.start == EPOS || r.end == EPOS)
+			if (!text_range_valid(&r))
 				break;
 			if (a->textobj->type == OUTER) {
 				r.start--;
 				r.end++;
 			}
-			// TODO c.range = range_union(&c.range, &r);
-			c.range.start = MIN(c.range.start, r.start);
-			c.range.end = MAX(c.range.end, r.end);
+
+			c.range = text_range_union(&c.range, &r);
+
 			if (i < a->count - 1) {
 				if (a->textobj == &textobjs[TEXT_OBJ_LINE_UP]) {
 					pos = c.range.start - 1;
@@ -851,7 +850,7 @@ static void action_do(Action *a) {
 		}
 	} else if (mode == &vis_modes[VIS_MODE_VISUAL]) {
 		c.range = window_selection_get(win);
-		if (c.range.start == EPOS || c.range.end == EPOS)
+		if (!text_range_valid(&c.range))
 			c.range.start = c.range.end = pos;
 	}
 
diff --git a/window.c b/window.c
index 59a275e..7329077 100644
--- a/window.c
+++ b/window.c
@@ -84,7 +84,7 @@ static bool window_scroll_lines_down(Win *win, int n);
 static bool window_scroll_lines_up(Win *win, int n);
 
 void window_selection_clear(Win *win) {
-	win->sel.start = win->sel.end = EPOS;
+	win->sel = text_range_empty();
 	window_draw(win);
 	window_cursor_update(win);
 	curs_set(1);
@@ -113,15 +113,13 @@ static void window_clear(Win *win) {
 
 Filerange window_selection_get(Win *win) {
 	Filerange sel = win->sel;
-	if (sel.start == EPOS || sel.end == EPOS) {
-		sel.start = sel.end = EPOS;
-		return sel;
-	}
 	if (sel.start > sel.end) {
 		size_t tmp = sel.start;
 		sel.start = sel.end;
 		sel.end = tmp;
 	}
+	if (!text_range_valid(&sel))
+		return text_range_empty();
 	sel.end = text_char_next(win->text, sel.end);
 	return sel;
 }