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131
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1 /* JSON trees
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145
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2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
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131
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3 Contributed by David Malcolm <dmalcolm@redhat.com>.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "json.h"
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25 #include "pretty-print.h"
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26 #include "math.h"
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27 #include "selftest.h"
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28
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29 using namespace json;
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30
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31 /* class json::value. */
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32
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33 /* Dump this json::value tree to OUTF.
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34 No formatting is done. There are no guarantees about the order
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35 in which the key/value pairs of json::objects are printed. */
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36
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37 void
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38 value::dump (FILE *outf) const
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39 {
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40 pretty_printer pp;
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41 pp_buffer (&pp)->stream = outf;
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42 print (&pp);
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43 pp_flush (&pp);
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44 }
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45
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46 /* class json::object, a subclass of json::value, representing
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47 an unordered collection of key/value pairs. */
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48
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49 /* json:object's dtor. */
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50
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51 object::~object ()
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52 {
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53 for (map_t::iterator it = m_map.begin (); it != m_map.end (); ++it)
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54 {
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55 free (const_cast <char *>((*it).first));
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56 delete ((*it).second);
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57 }
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58 }
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59
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60 /* Implementation of json::value::print for json::object. */
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61
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62 void
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63 object::print (pretty_printer *pp) const
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64 {
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65 /* Note that the order is not guaranteed. */
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66 pp_character (pp, '{');
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67 for (map_t::iterator it = m_map.begin (); it != m_map.end (); ++it)
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68 {
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69 if (it != m_map.begin ())
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70 pp_string (pp, ", ");
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71 const char *key = const_cast <char *>((*it).first);
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72 value *value = (*it).second;
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73 pp_printf (pp, "\"%s\": ", key); // FIXME: escaping?
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74 value->print (pp);
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75 }
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76 pp_character (pp, '}');
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77 }
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78
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79 /* Set the json::value * for KEY, taking ownership of V
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80 (and taking a copy of KEY if necessary). */
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81
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82 void
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83 object::set (const char *key, value *v)
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84 {
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85 gcc_assert (key);
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86 gcc_assert (v);
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87
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88 value **ptr = m_map.get (key);
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89 if (ptr)
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90 {
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91 /* If the key is already present, delete the existing value
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92 and overwrite it. */
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93 delete *ptr;
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94 *ptr = v;
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95 }
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96 else
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97 /* If the key wasn't already present, take a copy of the key,
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98 and store the value. */
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99 m_map.put (xstrdup (key), v);
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100 }
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101
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102 /* Get the json::value * for KEY.
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103
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104 The object retains ownership of the value. */
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105
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106 value *
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107 object::get (const char *key) const
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108 {
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109 gcc_assert (key);
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110
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111 value **ptr = const_cast <map_t &> (m_map).get (key);
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112 if (ptr)
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113 return *ptr;
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114 else
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115 return NULL;
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116 }
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117
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118 /* class json::array, a subclass of json::value, representing
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119 an ordered collection of values. */
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120
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121 /* json::array's dtor. */
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122
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123 array::~array ()
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124 {
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125 unsigned i;
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126 value *v;
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127 FOR_EACH_VEC_ELT (m_elements, i, v)
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128 delete v;
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129 }
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130
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131 /* Implementation of json::value::print for json::array. */
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132
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133 void
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134 array::print (pretty_printer *pp) const
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135 {
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136 pp_character (pp, '[');
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137 unsigned i;
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138 value *v;
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139 FOR_EACH_VEC_ELT (m_elements, i, v)
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140 {
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141 if (i)
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142 pp_string (pp, ", ");
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143 v->print (pp);
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144 }
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145 pp_character (pp, ']');
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146 }
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147
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148 /* Append non-NULL value V to a json::array, taking ownership of V. */
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149
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150 void
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151 array::append (value *v)
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152 {
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153 gcc_assert (v);
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154 m_elements.safe_push (v);
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155 }
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156
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145
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157 /* class json::float_number, a subclass of json::value, wrapping a double. */
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158
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159 /* Implementation of json::value::print for json::float_number. */
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160
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161 void
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162 float_number::print (pretty_printer *pp) const
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163 {
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164 char tmp[1024];
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165 snprintf (tmp, sizeof (tmp), "%g", m_value);
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166 pp_string (pp, tmp);
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167 }
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168
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169 /* class json::integer_number, a subclass of json::value, wrapping a long. */
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170
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171 /* Implementation of json::value::print for json::integer_number. */
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172
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173 void
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174 integer_number::print (pretty_printer *pp) const
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175 {
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176 char tmp[1024];
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177 snprintf (tmp, sizeof (tmp), "%ld", m_value);
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178 pp_string (pp, tmp);
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179 }
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180
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181
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131
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182 /* class json::string, a subclass of json::value. */
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183
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184 /* json::string's ctor. */
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185
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186 string::string (const char *utf8)
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187 {
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188 gcc_assert (utf8);
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189 m_utf8 = xstrdup (utf8);
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190 }
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191
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192 /* Implementation of json::value::print for json::string. */
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193
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194 void
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195 string::print (pretty_printer *pp) const
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196 {
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197 pp_character (pp, '"');
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198 for (const char *ptr = m_utf8; *ptr; ptr++)
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199 {
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200 char ch = *ptr;
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201 switch (ch)
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202 {
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203 case '"':
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204 pp_string (pp, "\\\"");
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205 break;
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206 case '\\':
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207 pp_string (pp, "\\n");
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208 break;
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209 case '\b':
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210 pp_string (pp, "\\b");
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211 break;
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212 case '\f':
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213 pp_string (pp, "\\f");
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214 break;
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215 case '\n':
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216 pp_string (pp, "\\n");
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217 break;
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218 case '\r':
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219 pp_string (pp, "\\r");
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220 break;
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221 case '\t':
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222 pp_string (pp, "\\t");
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223 break;
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224
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225 default:
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226 pp_character (pp, ch);
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227 }
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228 }
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229 pp_character (pp, '"');
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230 }
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231
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232 /* class json::literal, a subclass of json::value. */
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233
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234 /* Implementation of json::value::print for json::literal. */
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235
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236 void
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237 literal::print (pretty_printer *pp) const
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238 {
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239 switch (m_kind)
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240 {
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241 case JSON_TRUE:
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242 pp_string (pp, "true");
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243 break;
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244 case JSON_FALSE:
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245 pp_string (pp, "false");
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246 break;
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247 case JSON_NULL:
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248 pp_string (pp, "null");
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249 break;
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250 default:
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251 gcc_unreachable ();
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252 }
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253 }
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254
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255
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256 #if CHECKING_P
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257
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258 namespace selftest {
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259
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260 /* Selftests. */
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261
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262 /* Verify that JV->print () prints EXPECTED_JSON. */
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263
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264 static void
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265 assert_print_eq (const json::value &jv, const char *expected_json)
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266 {
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267 pretty_printer pp;
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268 jv.print (&pp);
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269 ASSERT_STREQ (expected_json, pp_formatted_text (&pp));
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270 }
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271
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272 /* Verify that object::get works as expected. */
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273
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274 static void
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275 test_object_get ()
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276 {
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277 object obj;
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278 value *val = new json::string ("value");
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279 obj.set ("foo", val);
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280 ASSERT_EQ (obj.get ("foo"), val);
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281 ASSERT_EQ (obj.get ("not-present"), NULL);
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282 }
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283
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284 /* Verify that JSON objects are written correctly. We can't test more than
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285 one key/value pair, as we don't impose a guaranteed ordering. */
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286
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287 static void
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288 test_writing_objects ()
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289 {
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290 object obj;
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291 obj.set ("foo", new json::string ("bar"));
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292 assert_print_eq (obj, "{\"foo\": \"bar\"}");
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293 }
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294
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295 /* Verify that JSON arrays are written correctly. */
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296
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297 static void
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298 test_writing_arrays ()
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299 {
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300 array arr;
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301 assert_print_eq (arr, "[]");
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302
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303 arr.append (new json::string ("foo"));
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304 assert_print_eq (arr, "[\"foo\"]");
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305
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306 arr.append (new json::string ("bar"));
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307 assert_print_eq (arr, "[\"foo\", \"bar\"]");
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308 }
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309
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310 /* Verify that JSON numbers are written correctly. */
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311
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312 static void
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313 test_writing_float_numbers ()
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131
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314 {
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315 assert_print_eq (float_number (0), "0");
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316 assert_print_eq (float_number (42), "42");
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317 assert_print_eq (float_number (-100), "-100");
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318 assert_print_eq (float_number (123456789), "1.23457e+08");
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319 }
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320
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321 static void
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322 test_writing_integer_numbers ()
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323 {
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324 assert_print_eq (integer_number (0), "0");
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325 assert_print_eq (integer_number (42), "42");
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326 assert_print_eq (integer_number (-100), "-100");
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327 assert_print_eq (integer_number (123456789), "123456789");
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328 assert_print_eq (integer_number (-123456789), "-123456789");
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131
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329 }
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330
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331 /* Verify that JSON strings are written correctly. */
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332
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333 static void
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334 test_writing_strings ()
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335 {
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336 string foo ("foo");
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337 assert_print_eq (foo, "\"foo\"");
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338
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339 string contains_quotes ("before \"quoted\" after");
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340 assert_print_eq (contains_quotes, "\"before \\\"quoted\\\" after\"");
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341 }
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342
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145
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343 /* Verify that JSON literals are written correctly. */
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131
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344
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345 static void
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346 test_writing_literals ()
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347 {
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348 assert_print_eq (literal (JSON_TRUE), "true");
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349 assert_print_eq (literal (JSON_FALSE), "false");
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350 assert_print_eq (literal (JSON_NULL), "null");
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351
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352 assert_print_eq (literal (true), "true");
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353 assert_print_eq (literal (false), "false");
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131
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354 }
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355
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356 /* Run all of the selftests within this file. */
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357
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358 void
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359 json_cc_tests ()
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360 {
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361 test_object_get ();
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131
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362 test_writing_objects ();
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363 test_writing_arrays ();
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364 test_writing_float_numbers ();
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365 test_writing_integer_numbers ();
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131
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366 test_writing_strings ();
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367 test_writing_literals ();
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368 }
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369
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370 } // namespace selftest
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371
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372 #endif /* #if CHECKING_P */
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