add logic to generate stable numbers

src/Generator/Protobuf.php

@@ -51,16 +51,28 @@ protected function writeStruct(Code\Name $name, array $properties, ?string $exte
     {
         $code = 'message ' . $name->getClass() . ' {' . "\n";
 
-        $index = 1;
         foreach ($properties as $property) {
             /** @var Code\Property $property */
-            $code.= $this->indent . 'optional ' . $property->getType() . ' ' . $property->getName()->getProperty() . ' = ' . $index . ' [json_name="' . $property->getName()->getRaw() . '"];' . "\n";
-
-            $index++;
+            $code.= $this->indent . 'optional ' . $property->getType() . ' ' . $property->getName()->getProperty() . ' = ' . $this->generateNumber($property->getName()->getRaw()) . ' [json_name="' . $property->getName()->getRaw() . '"];' . "\n";
         }
 
         $code.= '}' . "\n";
 
         return $code;
     }
+
+    private function generateNumber(string $name): int
+    {
+        $result = 0;
+        for ($i = 0; $i < strlen($name); $i++) {
+            $result+= ord($name[$i]);
+        }
+
+        if ($result >= 19_000 && $result <= 19_999) {
+            // Field numbers 19,000 to 19,999 are reserved for the Protocol Buffers implementation
+            $result += (19_999 - $result) + 1;
+        }
+
+        return $result;
+    }
 }

tests/Generator/resource/protobuf/protobuf.txt

@@ -1,38 +1,38 @@
 message Location {
-    optional float lat = 1 [json_name="lat"];
-    optional float long = 2 [json_name="long"];
+    optional float lat = 321 [json_name="lat"];
+    optional float long = 432 [json_name="long"];
 }
 
 
 message Author {
-    optional string title = 1 [json_name="title"];
-    optional string email = 2 [json_name="email"];
-    optional repeated string categories = 3 [json_name="categories"];
-    optional repeated Location locations = 4 [json_name="locations"];
-    optional Location origin = 5 [json_name="origin"];
+    optional string title = 546 [json_name="title"];
+    optional string email = 520 [json_name="email"];
+    optional repeated string categories = 1062 [json_name="categories"];
+    optional repeated Location locations = 972 [json_name="locations"];
+    optional Location origin = 648 [json_name="origin"];
 }
 
 
 message News {
-    optional map<string, string> config = 1 [json_name="config"];
-    optional map<string, string> inlineConfig = 2 [json_name="inlineConfig"];
-    optional map<string, string> mapTags = 3 [json_name="mapTags"];
-    optional map<string, Author> mapReceiver = 4 [json_name="mapReceiver"];
-    optional repeated string tags = 5 [json_name="tags"];
-    optional repeated Author receiver = 6 [json_name="receiver"];
-    optional bool read = 7 [json_name="read"];
-    optional Author author = 8 [json_name="author"];
-    optional map<string, string> meta = 9 [json_name="meta"];
-    optional Timestamp sendDate = 10 [json_name="sendDate"];
-    optional Timestamp readDate = 11 [json_name="readDate"];
-    optional float price = 12 [json_name="price"];
-    optional int64 rating = 13 [json_name="rating"];
-    optional string content = 14 [json_name="content"];
-    optional string question = 15 [json_name="question"];
-    optional string version = 16 [json_name="version"];
-    optional string coffeeTime = 17 [json_name="coffeeTime"];
-    optional string captcha = 18 [json_name="g-recaptcha-response"];
-    optional string mediaFields = 19 [json_name="media.fields"];
-    optional Any payload = 20 [json_name="payload"];
+    optional map<string, string> config = 630 [json_name="config"];
+    optional map<string, string> inlineConfig = 1237 [json_name="inlineConfig"];
+    optional map<string, string> mapTags = 717 [json_name="mapTags"];
+    optional map<string, Author> mapReceiver = 1139 [json_name="mapReceiver"];
+    optional repeated string tags = 431 [json_name="tags"];
+    optional repeated Author receiver = 853 [json_name="receiver"];
+    optional bool read = 412 [json_name="read"];
+    optional Author author = 659 [json_name="author"];
+    optional map<string, string> meta = 423 [json_name="meta"];
+    optional Timestamp sendDate = 808 [json_name="sendDate"];
+    optional Timestamp readDate = 794 [json_name="readDate"];
+    optional float price = 531 [json_name="price"];
+    optional int64 rating = 645 [json_name="rating"];
+    optional string content = 763 [json_name="content"];
+    optional string question = 888 [json_name="question"];
+    optional string version = 774 [json_name="version"];
+    optional string coffeeTime = 1015 [json_name="coffeeTime"];
+    optional string captcha = 2011 [json_name="g-recaptcha-response"];
+    optional string mediaFields = 1189 [json_name="media.fields"];
+    optional Any payload = 746 [json_name="payload"];
 }
 

tests/Generator/resource/protobuf/protobuf_oop.txt

@@ -1,38 +1,38 @@
 message HumanType {
-    optional string firstName = 1 [json_name="firstName"];
-    optional HumanType parent = 2 [json_name="parent"];
+    optional string firstName = 937 [json_name="firstName"];
+    optional HumanType parent = 650 [json_name="parent"];
 }
 
 
 message Student {
-    optional string firstName = 1 [json_name="firstName"];
-    optional HumanType parent = 2 [json_name="parent"];
-    optional string matricleNumber = 3 [json_name="matricleNumber"];
+    optional string firstName = 937 [json_name="firstName"];
+    optional HumanType parent = 650 [json_name="parent"];
+    optional string matricleNumber = 1466 [json_name="matricleNumber"];
 }
 
 
 message StudentMap {
-    optional int64 totalResults = 1 [json_name="totalResults"];
-    optional HumanType parent = 2 [json_name="parent"];
-    optional repeated Student entries = 3 [json_name="entries"];
+    optional int64 totalResults = 1302 [json_name="totalResults"];
+    optional HumanType parent = 650 [json_name="parent"];
+    optional repeated Student entries = 762 [json_name="entries"];
 }
 
 
 message HumanMap {
-    optional int64 totalResults = 1 [json_name="totalResults"];
-    optional HumanType parent = 2 [json_name="parent"];
-    optional repeated HumanType entries = 3 [json_name="entries"];
+    optional int64 totalResults = 1302 [json_name="totalResults"];
+    optional HumanType parent = 650 [json_name="parent"];
+    optional repeated HumanType entries = 762 [json_name="entries"];
 }
 
 
 message Map {
-    optional int64 totalResults = 1 [json_name="totalResults"];
-    optional P parent = 2 [json_name="parent"];
-    optional repeated T entries = 3 [json_name="entries"];
+    optional int64 totalResults = 1302 [json_name="totalResults"];
+    optional P parent = 650 [json_name="parent"];
+    optional repeated T entries = 762 [json_name="entries"];
 }
 
 
 message RootSchema {
-    optional StudentMap students = 1 [json_name="students"];
+    optional StudentMap students = 890 [json_name="students"];
 }