dyld3/JSONWriter.h

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef __JSON_WRITER_H__
  25 #define __JSON_WRITER_H__
  26
  27 #include <iostream>
  28
  29 #include "JSON.h"
  30
  31 namespace dyld3 {
  32 namespace json {
  33
  34 static inline std::string hex(uint64_t value) {
  35     char buff[64];
  36     sprintf(buff, "0x%llX", value);
  37     return buff;
  38 }
  39
  40 static inline std::string hex4(uint64_t value) {
  41     char buff[64];
  42     sprintf(buff, "0x%04llX", value);
  43     return buff;
  44 }
  45
  46 static inline std::string hex8(uint64_t value) {
  47     char buff[64];
  48     sprintf(buff, "0x%08llX", value);
  49     return buff;
  50 }
  51
  52 static inline std::string decimal(uint64_t value) {
  53     char buff[64];
  54     sprintf(buff, "%llu", value);
  55     return buff;
  56 }
  57
  58 static inline void indentBy(uint32_t spaces, std::ostream& out) {
  59     for (uint32_t i=0; i < spaces; ++i) {
  60         out << " ";
  61     }
  62 }
  63
  64 static inline void printJSON(const Node& node, uint32_t indent = 0, std::ostream& out = std::cout)
  65 {
  66     if ( !node.map.empty() ) {
  67         out << "{";
  68         bool needComma = false;
  69         for (const auto& entry : node.map) {
  70             if ( needComma )
  71                 out << ",";
  72             out << "\n";
  73             indentBy(indent+2, out);
  74             out << "\"" << entry.first << "\": ";
  75             printJSON(entry.second, indent+2, out);
  76             needComma = true;
  77         }
  78         out << "\n";
  79         indentBy(indent, out);
  80         out << "}";
  81     }
  82     else if ( !node.array.empty() ) {
  83         out << "[";
  84         bool needComma = false;
  85         for (const auto& entry : node.array) {
  86             if ( needComma )
  87                 out << ",";
  88             out << "\n";
  89             indentBy(indent+2, out);
  90             printJSON(entry, indent+2, out);
  91             needComma = true;
  92         }
  93         out << "\n";
  94         indentBy(indent, out);
  95         out << "]";
  96     }
  97     else {
  98         auto &value = node.value;
  99         switch (node.type) {
 100         case NodeValueType::Default:
 101         case NodeValueType::String:
 102             if (value.find('"') == std::string::npos) {
 103                 out << "\"" << value << "\"";
 104             } else {
 105                 std::string escapedString;
 106                 escapedString.reserve(value.size());
 107                 for (char c : value) {
 108                     if (c == '"')
 109                         escapedString += '\\';
 110                     escapedString += c;
 111                 }
 112                 out << "\"" << escapedString << "\"";
 113             }
 114             break;
 115         case NodeValueType::RawValue:
 116             out << value;
 117             break;
 118         }
 119     }
 120     if ( indent == 0 )
 121         out << "\n";
 122 }
 123
 124 static inline void streamArrayBegin(bool &needsComma, std::ostream& out = std::cout)
 125 {
 126     out << "[";
 127     needsComma = false;
 128 }
 129
 130 static inline void streamArrayNode(bool &needsComma, Node &node, std::ostream& out = std::cout)
 131 {
 132     if (needsComma)
 133         out << ",";
 134     out << "\n";
 135     indentBy(2, out);
 136     printJSON(node, 2, out);
 137     needsComma = true;
 138 }
 139
 140 static inline void streamArrayEnd(bool &needsComma, std::ostream& out = std::cout)
 141 {
 142     if (needsComma)
 143         out << "\n";
 144     out << "]\n";
 145 }
 146
 147 } // namespace json
 148 } // namespace dyld3
 149
 150
 151 #endif // __JSON_WRITER_H__