1 // JSON to JSONx conversion exmaple, using SAX API.
2 // JSONx is an IBM standard format to represent JSON as XML.
3 // https://www-01.ibm.com/support/knowledgecenter/SS9H2Y_7.1.0/com.ibm.dp.doc/json_jsonx.html
4 // This example parses JSON text from stdin with validation,
5 // and convert to JSONx format to stdout.
6 // Need compile with -D__STDC_FORMAT_MACROS for defining PRId64 and PRIu64 macros.
8 #include "rapidjson/reader.h"
9 #include "rapidjson/stringbuffer.h"
10 #include "rapidjson/filereadstream.h"
11 #include "rapidjson/filewritestream.h"
12 #include "rapidjson/error/en.h"
15 using namespace rapidjson;
17 // For simplicity, this example only read/write in UTF-8 encoding
18 template <typename OutputStream>
21 JsonxWriter(OutputStream& os) : os_(os), name_(), level_(0), hasName_(false) {
25 return WriteStartElement("null", true);
30 WriteStartElement("boolean") &&
31 WriteString(b ? "true" : "false") &&
32 WriteEndElement("boolean");
37 return WriteNumberElement(buffer, sprintf(buffer, "%d", i));
40 bool Uint(unsigned i) {
42 return WriteNumberElement(buffer, sprintf(buffer, "%u", i));
45 bool Int64(int64_t i) {
47 return WriteNumberElement(buffer, sprintf(buffer, "%" PRId64, i));
50 bool Uint64(uint64_t i) {
52 return WriteNumberElement(buffer, sprintf(buffer, "%" PRIu64, i));
55 bool Double(double d) {
57 return WriteNumberElement(buffer, sprintf(buffer, "%.17g", d));
60 bool RawNumber(const char* str, SizeType length, bool) {
62 WriteStartElement("number") &&
63 WriteEscapedText(str, length) &&
64 WriteEndElement("number");
67 bool String(const char* str, SizeType length, bool) {
69 WriteStartElement("string") &&
70 WriteEscapedText(str, length) &&
71 WriteEndElement("string");
75 return WriteStartElement("object");
78 bool Key(const char* str, SizeType length, bool) {
79 // backup key to name_
81 for (SizeType i = 0; i < length; i++)
87 bool EndObject(SizeType) {
88 return WriteEndElement("object");
92 return WriteStartElement("array");
95 bool EndArray(SizeType) {
96 return WriteEndElement("array");
100 bool WriteString(const char* s) {
106 bool WriteEscapedAttributeValue(const char* s, size_t length) {
107 for (size_t i = 0; i < length; i++) {
109 case '&': WriteString("&"); break;
110 case '<': WriteString("<"); break;
111 case '"': WriteString("""); break;
112 default: os_.Put(s[i]); break;
118 bool WriteEscapedText(const char* s, size_t length) {
119 for (size_t i = 0; i < length; i++) {
121 case '&': WriteString("&"); break;
122 case '<': WriteString("<"); break;
123 default: os_.Put(s[i]); break;
129 bool WriteStartElement(const char* type, bool emptyElement = false) {
131 if (!WriteString("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"))
134 if (!WriteString("<json:") || !WriteString(type))
137 // For root element, need to add declarations
140 " xsi:schemaLocation=\"http://www.datapower.com/schemas/json jsonx.xsd\""
141 " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\""
142 " xmlns:json=\"http://www.ibm.com/xmlns/prod/2009/jsonx\""))
148 if (!WriteString(" name=\"") ||
149 !WriteEscapedAttributeValue(name_.GetString(), name_.GetSize()) ||
155 return WriteString("/>");
158 return WriteString(">");
162 bool WriteEndElement(const char* type) {
163 if (!WriteString("</json:") ||
164 !WriteString(type) ||
168 // For the last end tag, flush the output stream.
175 bool WriteNumberElement(const char* buffer, int length) {
176 if (!WriteStartElement("number"))
178 for (int j = 0; j < length; j++)
180 return WriteEndElement("number");
189 int main(int, char*[]) {
190 // Prepare JSON reader and input stream.
192 char readBuffer[65536];
193 FileReadStream is(stdin, readBuffer, sizeof(readBuffer));
195 // Prepare JSON writer and output stream.
196 char writeBuffer[65536];
197 FileWriteStream os(stdout, writeBuffer, sizeof(writeBuffer));
198 JsonxWriter<FileWriteStream> writer(os);
200 // JSON reader parse from the input stream and let writer generate the output.
201 if (!reader.Parse(is, writer)) {
202 fprintf(stderr, "\nError(%u): %s\n", static_cast<unsigned>(reader.GetErrorOffset()), GetParseError_En(reader.GetParseErrorCode()));