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Message from discussion Does V8 has methods to parse json in c++.
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Matthias Ernst  
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 More options Jun 21 2012, 5:47 am
From: Matthias Ernst <matth...@mernst.org>
Date: Thu, 21 Jun 2012 11:47:55 +0200
Local: Thurs, Jun 21 2012 5:47 am
Subject: Re: [v8-users] Re: Does V8 has methods to parse json in c++.
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On Thu, Jun 21, 2012 at 12:49 AM, Mark Essel <mes...@gmail.com> wrote:
> Just wanted to say thanks for asking this question Guilherme. I know have
> access to a straight forward json parser for my native module.
> when walking the jsonObject that results from the parsing do you loop over
> properties to find the keys of interest or is there a rapid/hashlike lookup
> available?

You're using it already: obj_handle->Get(propertyName)

> ie
> Handle<Value> parseJson(Handle<Value> jsonString) {
>     HandleScope scope;

>     Handle<Context> context = Context::GetCurrent();
>     Handle<Object> global = context->Global();

>     Handle<Object> JSON = global->Get(String::New("JSON"))->ToObject();
>     Handle<Function> JSON_parse =
> Handle<Function>::Cast(JSON->Get(String::New("parse")));

>     // return JSON.parse.apply(JSON, jsonString);
>     return scope.Close(JSON_parse->Call(JSON, 1, &jsonString));
> }

> then on the returned Handle<Value> obj

> Local<Array> propertyNames = obj->GetPropertyNames();
> for (int i=0;i < propertyNames->Length();++i) {
>     // check if propertyName matches one I'm interested in
> }

> or recursively walk the json tree
> Handle<Value> findMatchingValue(const string &key, Handle<Value> obj) {
>     HandleScope scope;
>     Handle<Value> rval;
>     Local<Array> propertyNames = obj->GetPropertyNames();
>     for (int i=0;i < propertyNames->Length();++i) {
>         String::Utf8Value name = properNames->Get(i);
>         if (name == *obj) { // check if propertyName matches one I'm
> interested in, not sure this will compile/function as desired
>             rval = currentValue;
>         }
>         // if value type is an object or has children, gotta figure how to
> do this
>             rval = findMatchingValue(key,value)
>     }
> }

> On Sunday, June 10, 2012 5:30:10 PM UTC-4, Guilherme Silva wrote:

>> Thanks everybody for your replies! I want to create a Script Manager that
>> encapsulates V8 and abstracts both js from json files ;).

> --
> v8-users mailing list
> v8-users@googlegroups.com
> http://groups.google.com/group/v8-users


 
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