Added format editor and template engine

src/helper.cpp

@@ -309,4 +309,74 @@ float reduceFloatPrecision(float f, int dec) {
   return atof(&buffer[0]);
 }
 
+//
+// urlencode
+//
+// https://circuits4you.com/2019/03/21/esp8266-url-encode-decode-example/
+//
+String urlencode(String str) {
+  String encodedString = "";
+  char c;
+  char code0;
+  char code1;
+  for (int i =0; i < static_cast<int>(str.length()); i++) {
+    c = str.charAt(i);
+    if (isalnum(c)){
+      encodedString += c;
+    } else {
+      code1 = (c & 0xf) + '0';
+      if ((c & 0xf) >9) {
+          code1 = (c & 0xf) - 10 + 'A';
+      }
+      c = (c>>4) & 0xf;
+      code0 = c + '0';
+      if (c > 9) {
+          code0 = c - 10 + 'A';
+      }
+      encodedString += '%';
+      encodedString += code0;
+      encodedString += code1;
+    }
+  }
+  //Log.verbose(F("HELP: encode=%s" CR), encodedString.c_str());
+  return encodedString; 
+}
+
+unsigned char h2int(char c) {
+  if (c >= '0' && c <='9') {
+    return((unsigned char)c - '0');
+  }
+  if (c >= 'a' && c <='f') {
+    return((unsigned char)c - 'a' + 10);
+  }
+  if (c >= 'A' && c <='F') {
+    return((unsigned char)c - 'A' + 10);
+  }
+  return(0);
+}
+
+String urldecode(String str) {
+  String encodedString = "";
+  char c;
+  char code0;
+  char code1;
+  for (int i = 0; i < static_cast<int>(str.length()); i++){
+    c = str.charAt(i);
+    if (c == '%') {
+      i++;
+      code0 = str.charAt(i);
+      i++;
+      code1 = str.charAt(i);
+      c = (h2int(code0) << 4) | h2int(code1);
+      encodedString += c;
+    } else {
+      encodedString += c;
+    }
+  }   
+
+  //Log.verbose(F("HELP: decode=%s" CR), encodedString.c_str());
+  return encodedString;
+}
+
+
 // EOF