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Diffstat (limited to 'example/filterkeydom/filterkeydom.cpp')
| -rw-r--r-- | example/filterkeydom/filterkeydom.cpp | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/example/filterkeydom/filterkeydom.cpp b/example/filterkeydom/filterkeydom.cpp deleted file mode 100644 index 732cc81..0000000 --- a/example/filterkeydom/filterkeydom.cpp +++ /dev/null @@ -1,170 +0,0 @@ -// JSON filterkey example which populates filtered SAX events into a Document. - -// This example parses JSON text from stdin with validation. -// During parsing, specified key will be filtered using a SAX handler. -// And finally the filtered events are used to populate a Document. -// As an example, the document is written to standard output. - -#include "rapidjson/document.h" -#include "rapidjson/writer.h" -#include "rapidjson/filereadstream.h" -#include "rapidjson/filewritestream.h" -#include "rapidjson/error/en.h" -#include <stack> - -using namespace rapidjson; - -// This handler forwards event into an output handler, with filtering the descendent events of specified key. -template <typename OutputHandler> -class FilterKeyHandler { -public: - typedef char Ch; - - FilterKeyHandler(OutputHandler& outputHandler, const Ch* keyString, SizeType keyLength) : - outputHandler_(outputHandler), keyString_(keyString), keyLength_(keyLength), filterValueDepth_(), filteredKeyCount_() - {} - - bool Null() { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Null() && EndValue(); } - bool Bool(bool b) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Bool(b) && EndValue(); } - bool Int(int i) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Int(i) && EndValue(); } - bool Uint(unsigned u) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Uint(u) && EndValue(); } - bool Int64(int64_t i) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Int64(i) && EndValue(); } - bool Uint64(uint64_t u) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Uint64(u) && EndValue(); } - bool Double(double d) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.Double(d) && EndValue(); } - bool RawNumber(const Ch* str, SizeType len, bool copy) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.RawNumber(str, len, copy) && EndValue(); } - bool String (const Ch* str, SizeType len, bool copy) { return filterValueDepth_ > 0 ? EndValue() : outputHandler_.String (str, len, copy) && EndValue(); } - - bool StartObject() { - if (filterValueDepth_ > 0) { - filterValueDepth_++; - return true; - } - else { - filteredKeyCount_.push(0); - return outputHandler_.StartObject(); - } - } - - bool Key(const Ch* str, SizeType len, bool copy) { - if (filterValueDepth_ > 0) - return true; - else if (len == keyLength_ && std::memcmp(str, keyString_, len) == 0) { - filterValueDepth_ = 1; - return true; - } - else { - ++filteredKeyCount_.top(); - return outputHandler_.Key(str, len, copy); - } - } - - bool EndObject(SizeType) { - if (filterValueDepth_ > 0) { - filterValueDepth_--; - return EndValue(); - } - else { - // Use our own filtered memberCount - SizeType memberCount = filteredKeyCount_.top(); - filteredKeyCount_.pop(); - return outputHandler_.EndObject(memberCount) && EndValue(); - } - } - - bool StartArray() { - if (filterValueDepth_ > 0) { - filterValueDepth_++; - return true; - } - else - return outputHandler_.StartArray(); - } - - bool EndArray(SizeType elementCount) { - if (filterValueDepth_ > 0) { - filterValueDepth_--; - return EndValue(); - } - else - return outputHandler_.EndArray(elementCount) && EndValue(); - } - -private: - FilterKeyHandler(const FilterKeyHandler&); - FilterKeyHandler& operator=(const FilterKeyHandler&); - - bool EndValue() { - if (filterValueDepth_ == 1) // Just at the end of value after filtered key - filterValueDepth_ = 0; - return true; - } - - OutputHandler& outputHandler_; - const char* keyString_; - const SizeType keyLength_; - unsigned filterValueDepth_; - std::stack<SizeType> filteredKeyCount_; -}; - -// Implements a generator for Document::Populate() -template <typename InputStream> -class FilterKeyReader { -public: - typedef char Ch; - - FilterKeyReader(InputStream& is, const Ch* keyString, SizeType keyLength) : - is_(is), keyString_(keyString), keyLength_(keyLength), parseResult_() - {} - - // SAX event flow: reader -> filter -> handler - template <typename Handler> - bool operator()(Handler& handler) { - FilterKeyHandler<Handler> filter(handler, keyString_, keyLength_); - Reader reader; - parseResult_ = reader.Parse(is_, filter); - return parseResult_; - } - - const ParseResult& GetParseResult() const { return parseResult_; } - -private: - FilterKeyReader(const FilterKeyReader&); - FilterKeyReader& operator=(const FilterKeyReader&); - - InputStream& is_; - const char* keyString_; - const SizeType keyLength_; - ParseResult parseResult_; -}; - -int main(int argc, char* argv[]) { - if (argc != 2) { - fprintf(stderr, "filterkeydom key < input.json > output.json\n"); - return 1; - } - - // Prepare input stream. - char readBuffer[65536]; - FileReadStream is(stdin, readBuffer, sizeof(readBuffer)); - - // Prepare Filter - FilterKeyReader<FileReadStream> reader(is, argv[1], static_cast<SizeType>(strlen(argv[1]))); - - // Populates the filtered events from reader - Document document; - document.Populate(reader); - ParseResult pr = reader.GetParseResult(); - if (!pr) { - fprintf(stderr, "\nError(%u): %s\n", static_cast<unsigned>(pr.Offset()), GetParseError_En(pr.Code())); - return 1; - } - - // Prepare JSON writer and output stream. - char writeBuffer[65536]; - FileWriteStream os(stdout, writeBuffer, sizeof(writeBuffer)); - Writer<FileWriteStream> writer(os); - - // Write the document to standard output - document.Accept(writer); - return 0; -} |