Hi,

I've studied the following documenation to make sure I'm using FindPath() correctly.

http://www.freepascal.org/docs-html/3.0.0/fcl/fpjson/tjsondata.findpath.html

Now, I have the following JSON data.... I omitted what is not relevant. ========================
{
...snip...
"VersionDependencies": {
"2.5.0": {
"packages": "master",
"framework": "3.11.0"
}
}
}
========================

I can do Data.FindPath("VersionDependencies") and it finds the data node without problems.

But when I try:

var
  ver: string:
begin
  ver := '2.5.0';
  ...snip...
  Data.FindPath('VersionDependencies.'+ver)

It never finds the "2.5.0" data node. I'm assuming the dots in the version string is what is causing the problem in fcl-json. Initially I thought I could add extra quotes around the version string. Like so:

Data.FindPath('VersionDependencies.'''+ver+'''')

But that didn't work either.

Is this a bug of some sorts, or is there another way around this problem?

I guess my only option is to use TJSONenum and iterate of the "VersionDependencies" data, and manually look for the data node I'm interested in. Like so:

  d := Data.FindPath('VersionDependencies');
  for ItrItem in d do
    if d.Key = ver then
       ...snip...

Is there another way of finding the data I'm interested in?

Regards,
Graeme

since . is used as a delimiter between path segments, you indeed cannot find paths that contain a . in a segment.

I see no nice way out of this.

One way is to allow to escape dots in the path.
But because every character is allowed in a javascript object property, that would mean that \. can also be a correct property name, and so we need to introduce \\ as an escape for \...

It could be added.

Michael

No, I think that will just get messy (your choice). I was just wondering if I was doing something wrong. Either way, I managed to use TJSONenum and it worked just fine for my needs.

Regards,
Graeme

Indeed. If you experiment in the browser console:

var obj = {};
undefined
obj
Object { }
obj["1.2.3"] = 'ok';
"ok"
obj
Object { 1.2.3: "ok" }
obj['allez"na'] = 'ok';
"ok"
obj
Object { 1.2.3: "ok", allez"na: "ok" }
obj['not\nice']="beeeh"
"beeeh"
obj
Object { 1.2.3: "ok", allez"na: "ok", not
ice: "beeeh" }
obj['not\ nice']="beeeh"
"beeeh"
obj
Object { 1.2.3: "ok", allez"na: "ok", not
ice: "beeeh", not nice: "beeeh" }

Not so nice at all...

Michael.

Michael Van Canneyt wrote

Indeed. If you experiment in the browser console:

It might just be worth adding a small note about that "gotcha" in the FindPath documentation.

Regards,
Graeme