Fixes circular dependency and lightened some modules

scripts/lua/modules/string_utils.lua

@@ -0,0 +1,78 @@
+--
+-- (C) 2014-24 - ntop.org
+--
+
+-- ###############################################
+
+-- removes trailing/leading spaces
+function trimString(s)
+    return (s:gsub("^%s*(.-)%s*$", "%1"))
+end
+
+-- ###############################################
+
+-- removes all spaces
+function trimSpace(what)
+    if (what == nil) then
+        return ("")
+    end
+    return (string.gsub(string.gsub(what, "%s+", ""), "+%s", ""))
+end
+
+-- ##############################################
+
+-- Note: Regexs are applied by default. Pass plain=true to disable them.
+function string.contains(str, start, is_plain)
+    if type(str) ~= 'string' or type(start) ~= 'string' or isEmptyString(str) or isEmptyString(start) then
+        return false
+    end
+
+    local i, _ = string.find(str, start, 1, is_plain)
+
+    return (i ~= nil)
+end
+
+-- ##############################################
+
+function shortenString(name, max_len)
+    local ellipsis = "\u{2026}" -- The unicode ellipsis (takes less space than three separate dots)
+    if (name == nil) then
+        return ("")
+    end
+
+    if max_len == nil then
+        max_len = ntop.getPref("ntopng.prefs.max_ui_strlen")
+        max_len = tonumber(max_len)
+        if (max_len == nil) then
+            max_len = 24
+        end
+    end
+
+    -- Error, max_len is not a number, print an error and return the name
+    if not tonumber(max_len) then
+        traceError(TRACE_DEBUG, TRACE_CONSOLE, "Length parameter is not a number.")
+        tprint(debug.traceback())
+        return name
+    end
+    if (string.len(name) < max_len + 1 --[[ The space taken by the ellipsis --]] ) then
+        return (name)
+    else
+        return (string.sub(name, 1, max_len) .. ellipsis)
+    end
+end
+
+-- ##############################################
+
+function string.containsIgnoreCase(str, start, is_plain)
+    return string.contains(string.lower(str), string.lower(start), is_plain)
+end
+
+-- startswith
+function startswith(s, char)
+    return string.sub(s, 1, string.len(s)) == char
+end
+
+-- endswith
+function endswith(s, char)
+    return string.sub(s, -#char) == char
+end