Add a switch to initialize default values

cli/pbjs.js

@@ -31,7 +31,7 @@ exports.main = function main(args, callback) {
             lint   : "l"
         },
         string: [ "target", "out", "path", "wrap", "root", "lint" ],
-        boolean: [ "keep-case", "create", "encode", "decode", "verify", "convert", "delimited", "beautify", "comments", "es6", "sparse" ],
+        boolean: [ "keep-case", "create", "encode", "decode", "verify", "convert", "delimited", "beautify", "comments", "es6", "sparse", "defaults" ],
         default: {
             target    : "json",
             create    : true,
@@ -42,6 +42,7 @@ exports.main = function main(args, callback) {
             delimited : true,
             beautify  : true,
             comments  : true,
+            defaults  : false,
             es6       : null,
             lint      : lintDefault
         }
@@ -51,6 +52,11 @@ exports.main = function main(args, callback) {
         files  = argv._,
         paths  = typeof argv.path === "string" ? [ argv.path ] : argv.path || [];
 
+    protobuf.encoder.defaults = argv.defaults;
+    protobuf.decoder.defaults = argv.defaults;
+    protobuf.converter.defaults = argv.defaults;
+    protobuf.Class.defaults = argv.defaults;
+
     // protobuf.js package directory contains additional, otherwise non-bundled google types
     paths.push(path.relative(process.cwd(), path.join(__dirname, "..")) || ".");
 
@@ -107,6 +113,7 @@ exports.main = function main(args, callback) {
                 "  --no-delimited  Does not generate delimited encode/decode functions.",
                 "  --no-beautify   Does not beautify generated code.",
                 "  --no-comments   Does not output any JSDoc comments.",
+                "  --defaults      Does set default values when using .decode() or new()",
                 "",
                 "usage: " + chalk.bold.green("pbjs") + " [options] file1.proto file2.json ..." + chalk.gray("  (or)  ") + "other | " + chalk.bold.green("pbjs") + " [options] -",
                 ""

src/class.js

@@ -6,6 +6,9 @@ var Message = require("./message"),
 
 var Type; // cyclic
 
+// see cli/pbjs.js
+Class.defaults = false;
+
 /**
  * Constructs a new message prototype for the specified reflected type and sets up its constructor.
  * @classdesc Runtime class providing the tools to create your own custom classes.
@@ -79,13 +82,19 @@ Class.generate = function generate(type) { // eslint-disable-line no-unused-vars
     var gen = util.codegen("p");
     // see issue #700: the following would add explicitly initialized mutable object/array fields
     // so that these aren't just inherited from the prototype. will break test cases.
-    /*
-    for (var i = 0, field; i < type.fieldsArray.length; ++i)
-        if ((field = type._fieldsArray[i]).map) gen
-            ("this%s={}", util.safeProp(field.name));
-        else if (field.repeated) gen
-            ("this%s=[]", util.safeProp(field.name));
-    */
+
+    if (Class.defaults) {
+        for (var i = 0; i < type.fieldsArray.length; ++i) {
+            var field = type.fieldsArray[i];
+            var prop = util.safeProp(field.name);
+
+            if (field.map) gen
+                ("this%s={}", prop);
+            else if (field.repeated) gen
+                ("this%s=[]", prop);
+        }
+    }
+
     return gen
     ("if(p){")
         ("for(var ks=Object.keys(p),i=0;i<ks.length;++i)")

src/converter.js

@@ -8,6 +8,9 @@ var converter = exports;
 var Enum = require("./enum"),
     util = require("./util");
 
+// see cli/pbjs.js
+converter.defaults = false;
+
 /**
  * Generates a partial value fromObject conveter.
  * @param {Codegen} gen Codegen instance
@@ -123,8 +126,12 @@ converter.fromObject = function fromObject(mtype) {
         } else if (field.repeated) { gen
     ("if(d%s){", prop)
         ("if(!Array.isArray(d%s))", prop)
-            ("throw TypeError(%j)", field.fullName + ": array expected")
-        ("m%s=[]", prop)
+            ("throw TypeError(%j)", field.fullName + ": array expected");
+
+            if (!converter.defaults) gen
+        ("m%s=[]", prop);
+
+            gen
         ("for(var i=0;i<d%s.length;++i){", prop);
             genValuePartial_fromObject(gen, field, i, prop + "[i]")
         ("}")

src/decoder.js

@@ -3,6 +3,9 @@ module.exports = decoder;
 
 decoder.compat = true;
 
+// see cli/pbjs.js
+decoder.defaults = false;
+
 var Enum    = require("./enum"),
     types   = require("./types"),
     util    = require("./util");
@@ -52,8 +55,8 @@ function decoder(mtype) {
                 ("%s[typeof k===\"object\"?util.longToHash(k):k]=r.%s()", ref, type);
 
         // Repeated fields
-        } else if (field.repeated) { gen
-
+        } else if (field.repeated) {
+            if (!decoder.defaults) gen
                 ("if(!(%s&&%s.length))", ref, ref)
                     ("%s=[]", ref);
 

src/encoder.js

@@ -3,6 +3,9 @@ module.exports = encoder;
 
 encoder.compat = true;
 
+// see cli/pbjs.js
+encoder.defaults = false;
+
 var Enum     = require("./enum"),
     types    = require("./types"),
     util     = require("./util");
@@ -90,9 +93,15 @@ function encoder(mtype) {
     ("}");
 
             // Non-packed
-            } else { gen
+            } else {
+                if(encoder.defaults) { gen
+        ("if(%s!==undefined&&%s.length){", ref, ref);
+                }
+                else { gen
+        ("if(%s!==undefined&&m.hasOwnProperty(%j)){", ref, field.name);
+                }
 
-    ("if(%s!==undefined&&m.hasOwnProperty(%j)){", ref, field.name)
+                gen
         ("for(var i=0;i<%s.length;++i)", ref);
                 if (wireType === undefined)
             genTypePartial(gen, field, index, ref + "[i]");