Method evalJSONPointer

Fleece/Core/Path.cc:137–172

static*/

    /*static*/ const Value* Path::evalJSONPointer(slice specifier, const Value *root)
    {
        slice_istream in(specifier);
        auto current = root;
        throwIf(in.readByte() != '/', PathSyntaxError, "JSONPointer does not start with '/'");
        while (!in.eof()) {
            if (!current)
                return nullptr;

            auto slash = in.findByteOrEnd('/');
            slice_istream param(in.buf, slash);

            switch(current->type()) {
                case kArray: {
                    auto i = param.readDecimal();
                    if (_usuallyFalse(param.size > 0 || i > INT32_MAX))
                        FleeceException::_throw(PathSyntaxError, "Invalid array index in JSONPointer");
                    current = ((const Array*)current)->get((uint32_t)i);
                    break;
                }
                case kDict: {
                    string key = param.asString();
                    current = ((const Dict*)current)->get(key);
                    break;
                }
                default:
                    current = nullptr;
                    break;
            }

            if (slash == in.end())
                break;
            in.setStart(slash+1);
        }
        return current;
    }


#pragma mark - PARSING: