builtin: add string.split_by_space() (#23651)

Author: gechandesu

vlib/builtin/string.v

@@ -1108,6 +1108,18 @@ pub fn (s string) split_into_lines() []string {
 	return res
 }
 
+// split_by_space splits the string by whitespace (any of ` `, `\n`, `\t`, `\v`, `\f`, `\r`).
+// Repeated, trailing or leading whitespaces will be omitted.
+pub fn (s string) split_by_space() []string {
+	mut res := []string{}
+	for word in s.split_any(' \n\t\v\f\r') {
+		if word != '' {
+			res << word
+		}
+	}
+	return res
+}
+
 // substr returns the string between index positions `start` and `end`.
 // Example: assert 'ABCD'.substr(1,3) == 'BC'
 @[direct_array_access]

vlib/builtin/string_test.v

@@ -442,6 +442,13 @@ fn test_rsplit_once() ? {
 	assert ext3 == ''
 }
 
+fn test_split_by_space() {
+	assert 'a     b    c'.split_by_space() == ['a', 'b', 'c']
+	assert '  a\t\tb\tc'.split_by_space() == ['a', 'b', 'c']
+	assert 'a b c \n\r'.split_by_space() == ['a', 'b', 'c']
+	assert '\ta b \t \tc \r\n'.split_by_space() == ['a', 'b', 'c']
+}
+
 fn test_is_bin() {
 	assert ''.is_bin() == false
 	assert '0b1'.is_bin() == true