label protection

2 files changed, 28 insertions, 0 deletions

diff --git a/src/auxiliary/functions.cc b/src/auxiliary/functions.cc
index dbfc799..a6187af 100644
--- a/src/auxiliary/functions.cc
+++ b/src/auxiliary/functions.cc
@@ -143,4 +143,26 @@ void trim(std::string &text)
 	}
 }
 
+void to_label(std::string &text)
+{
+	trim(text);
+	size_t pos = 0;
+
+	while (pos < text.size()) {
+		if ((text[pos] == ' ') || (text[pos] == '-')) {
+			text[pos] = '_';
+			pos++;
+		} else if ((text[pos] >= 'A') && (text[pos] <= 'Z')) {
+			text[pos] = text[pos] + 'a' - 'A';
+			pos++;
+		} else if ((text[pos] >= 'a') && (text[pos] <= 'z')) {
+			pos++;
+		} else if ((text[pos] >= '0') && (text[pos] <= '9')) {
+			pos++;
+		} else {
+			text.erase(pos, 1);
+		}
+	}
+}
+
 }
diff --git a/src/auxiliary/functions.h b/src/auxiliary/functions.h
index 557ab45..65b6a2b 100644
--- a/src/auxiliary/functions.h
+++ b/src/auxiliary/functions.h
@@ -55,6 +55,12 @@ const std::string text_strip_lowercase(const std::string &text);
 /// trim leading ad trailing spaces from a string
 void trim(std::string &text);
 
+/// convert a string to a valid label string
+/** trim leading and trealing spaces, convert remaining spaces to underscores, and make lowercase
+ * remove any non-alphanumeric character
+ */
+void to_label(std::string &text);
+
 }
 
 #endif // __INCLUDED_AUX_FUNCTIONS_H__