1 // JSON condenser example 2 3 // This example parses JSON from stdin with validation, 4 // and re-output the JSON content to stdout with all string capitalized, and without whitespace. 5 6 #include "rapidjson/reader.h" 7 #include "rapidjson/writer.h" 8 #include "rapidjson/filereadstream.h" 9 #include "rapidjson/filewritestream.h" 10 #include "rapidjson/error/en.h" 11 #include <vector> 12 #include <cctype> 13 14 using namespace rapidjson; 15 16 template<typename OutputHandler> 17 struct CapitalizeFilter { 18 CapitalizeFilter(OutputHandler& out) : out_(out), buffer_() {} 19 20 bool Null() { return out_.Null(); } 21 bool Bool(bool b) { return out_.Bool(b); } 22 bool Int(int i) { return out_.Int(i); } 23 bool Uint(unsigned u) { return out_.Uint(u); } 24 bool Int64(int64_t i) { return out_.Int64(i); } 25 bool Uint64(uint64_t u) { return out_.Uint64(u); } 26 bool Double(double d) { return out_.Double(d); } 27 bool String(const char* str, SizeType length, bool) { 28 buffer_.clear(); 29 for (SizeType i = 0; i < length; i++) 30 buffer_.push_back(std::toupper(str[i])); 31 return out_.String(&buffer_.front(), length, true); // true = output handler need to copy the string 32 } 33 bool StartObject() { return out_.StartObject(); } 34 bool Key(const char* str, SizeType length, bool copy) { return String(str, length, copy); } 35 bool EndObject(SizeType memberCount) { return out_.EndObject(memberCount); } 36 bool StartArray() { return out_.StartArray(); } 37 bool EndArray(SizeType elementCount) { return out_.EndArray(elementCount); } 38 39 OutputHandler& out_; 40 std::vector<char> buffer_; 41 42 private: 43 CapitalizeFilter(const CapitalizeFilter&); 44 CapitalizeFilter& operator=(const CapitalizeFilter&); 45 }; 46 47 int main(int, char*[]) { 48 // Prepare JSON reader and input stream. 49 Reader reader; 50 char readBuffer[65536]; 51 FileReadStream is(stdin, readBuffer, sizeof(readBuffer)); 52 53 // Prepare JSON writer and output stream. 54 char writeBuffer[65536]; 55 FileWriteStream os(stdout, writeBuffer, sizeof(writeBuffer)); 56 Writer<FileWriteStream> writer(os); 57 58 // JSON reader parse from the input stream and let writer generate the output. 59 CapitalizeFilter<Writer<FileWriteStream> > filter(writer); 60 if (!reader.Parse(is, filter)) { 61 fprintf(stderr, "\nError(%u): %s\n", (unsigned)reader.GetErrorOffset(), GetParseError_En(reader.GetParseErrorCode())); 62 return 1; 63 } 64 65 return 0; 66 } 67
