Double-click word selection for RichTextLabel (i.e. docs)

1 files changed, 34 insertions, 0 deletions

diff --git a/core/ustring.cpp b/core/ustring.cpp
index ceafe209ea..ece3928298 100644
--- a/core/ustring.cpp
+++ b/core/ustring.cpp
@@ -56,6 +56,40 @@
 #define IS_DIGIT(m_d) ((m_d) >= '0' && (m_d) <= '9')
 #define IS_HEX_DIGIT(m_d) (((m_d) >= '0' && (m_d) <= '9') || ((m_d) >= 'a' && (m_d) <= 'f') || ((m_d) >= 'A' && (m_d) <= 'F'))
 
+bool is_symbol(CharType c) {
+	return c != '_' && ((c >= '!' && c <= '/') || (c >= ':' && c <= '@') || (c >= '[' && c <= '`') || (c >= '{' && c <= '~') || c == '\t' || c == ' ');
+}
+
+bool select_word(const String &p_s, int p_col, int &r_beg, int &r_end) {
+
+	const String &s = p_s;
+	int beg = CLAMP(p_col, 0, s.length());
+	int end = beg;
+
+	if (s[beg] > 32 || beg == s.length()) {
+
+		bool symbol = beg < s.length() && is_symbol(s[beg]);
+
+		while (beg > 0 && s[beg - 1] > 32 && (symbol == is_symbol(s[beg - 1]))) {
+			beg--;
+		}
+		while (end < s.length() && s[end + 1] > 32 && (symbol == is_symbol(s[end + 1]))) {
+			end++;
+		}
+
+		if (end < s.length())
+			end += 1;
+
+		r_beg = beg;
+		r_end = end;
+
+		return true;
+	} else {
+
+		return false;
+	}
+}
+
 /** STRING **/
 
 bool CharString::operator<(const CharString &p_right) const {