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Deserializing to custom targets (classes) #253

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rahbari wants to merge 2 commits into from
+10 −4
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Deserializing to custom targets (classes) #253

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bb6b036
Target added to deserialize
rahbari Jun 7, 2018
da6562c
inner target changed to newTarget
rahbari Jun 7, 2018
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14 changes: 10 additions & 4 deletions lib/bson/parser/deserializer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ var deserialize = function(buffer, options, isArray) {
return deserializeObject(buffer, index, options, isArray);
};

var deserializeObject = function(buffer, index, options, isArray) {
var deserializeObject = function(buffer, index, options, isArray, target) {
var evalFunctions = options['evalFunctions'] == null ? false : options['evalFunctions'];
var cacheFunctions = options['cacheFunctions'] == null ? false : options['cacheFunctions'];
var cacheFunctionsCrc32 =
Expand Down Expand Up @@ -73,11 +73,14 @@ var deserializeObject = function(buffer, index, options, isArray) {
if (size < 5 || size > buffer.length) throw new Error('corrupt bson message');

// Create holding object
var object = isArray ? [] : {};
var object = (target instanceof Function) ? new target() : (isArray ? [] : {});
// Used for arrays to skip having to perform utf8 decoding
var arrayIndex = 0;

var done = false;
var newTarget = null;

if (isArray && target) newTarget = target['$'];

// While we have more left data left keep parsing
// while (buffer[index + 1] !== 0) {
Expand All @@ -98,6 +101,9 @@ var deserializeObject = function(buffer, index, options, isArray) {
if (i >= buffer.length) throw new Error('Bad BSON Document: illegal CString');
var name = isArray ? arrayIndex++ : buffer.toString('utf8', index, i);

if (name === 'firstBatch' || name === 'nextBatch') newTarget = {$: options.target};
else if (!isArray && target) newTarget = target['$' + name];

index = i + 1;

if (elementType === BSON.BSON_DATA_STRING) {
Expand Down Expand Up @@ -164,7 +170,7 @@ var deserializeObject = function(buffer, index, options, isArray) {
if (raw) {
object[name] = buffer.slice(index, index + objectSize);
} else {
object[name] = deserializeObject(buffer, _index, options, false);
object[name] = deserializeObject(buffer, _index, options, false, newTarget);
}

index = index + objectSize;
Expand All @@ -187,7 +193,7 @@ var deserializeObject = function(buffer, index, options, isArray) {
arrayOptions['raw'] = true;
}

object[name] = deserializeObject(buffer, _index, arrayOptions, true);
object[name] = deserializeObject(buffer, _index, arrayOptions, true, newTarget);
index = index + objectSize;

if (buffer[index - 1] !== 0) throw new Error('invalid array terminator byte');
Expand Down