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131
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1 /* JSON trees
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2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
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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 /* class json::array, a subclass of json::value, representing
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103 an ordered collection of values. */
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104
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105 /* json::array's dtor. */
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106
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107 array::~array ()
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108 {
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109 unsigned i;
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110 value *v;
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111 FOR_EACH_VEC_ELT (m_elements, i, v)
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112 delete v;
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113 }
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114
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115 /* Implementation of json::value::print for json::array. */
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116
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117 void
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118 array::print (pretty_printer *pp) const
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119 {
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120 pp_character (pp, '[');
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121 unsigned i;
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122 value *v;
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123 FOR_EACH_VEC_ELT (m_elements, i, v)
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124 {
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125 if (i)
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126 pp_string (pp, ", ");
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127 v->print (pp);
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128 }
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129 pp_character (pp, ']');
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130 }
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131
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132 /* Append non-NULL value V to a json::array, taking ownership of V. */
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133
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134 void
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135 array::append (value *v)
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136 {
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137 gcc_assert (v);
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138 m_elements.safe_push (v);
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139 }
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140
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141 /* class json::number, a subclass of json::value, wrapping a double. */
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142
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143 /* Implementation of json::value::print for json::number. */
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144
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145 void
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146 number::print (pretty_printer *pp) const
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147 {
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148 char tmp[1024];
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149 snprintf (tmp, sizeof (tmp), "%g", m_value);
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150 pp_string (pp, tmp);
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151 }
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152
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153 /* class json::string, a subclass of json::value. */
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154
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155 /* json::string's ctor. */
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156
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157 string::string (const char *utf8)
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158 {
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159 gcc_assert (utf8);
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160 m_utf8 = xstrdup (utf8);
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161 }
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162
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163 /* Implementation of json::value::print for json::string. */
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164
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165 void
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166 string::print (pretty_printer *pp) const
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167 {
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168 pp_character (pp, '"');
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169 for (const char *ptr = m_utf8; *ptr; ptr++)
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170 {
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171 char ch = *ptr;
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172 switch (ch)
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173 {
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174 case '"':
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175 pp_string (pp, "\\\"");
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176 break;
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177 case '\\':
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178 pp_string (pp, "\\n");
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179 break;
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180 case '\b':
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181 pp_string (pp, "\\b");
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182 break;
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183 case '\f':
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184 pp_string (pp, "\\f");
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185 break;
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186 case '\n':
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187 pp_string (pp, "\\n");
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188 break;
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189 case '\r':
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190 pp_string (pp, "\\r");
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191 break;
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192 case '\t':
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193 pp_string (pp, "\\t");
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194 break;
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195
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196 default:
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197 pp_character (pp, ch);
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198 }
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199 }
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200 pp_character (pp, '"');
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201 }
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202
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203 /* class json::literal, a subclass of json::value. */
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204
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205 /* Implementation of json::value::print for json::literal. */
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206
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207 void
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208 literal::print (pretty_printer *pp) const
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209 {
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210 switch (m_kind)
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211 {
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212 case JSON_TRUE:
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213 pp_string (pp, "true");
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214 break;
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215 case JSON_FALSE:
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216 pp_string (pp, "false");
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217 break;
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218 case JSON_NULL:
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219 pp_string (pp, "null");
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220 break;
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221 default:
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222 gcc_unreachable ();
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223 }
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224 }
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225
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226
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227 #if CHECKING_P
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228
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229 namespace selftest {
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230
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231 /* Selftests. */
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232
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233 /* Verify that JV->print () prints EXPECTED_JSON. */
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234
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235 static void
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236 assert_print_eq (const json::value &jv, const char *expected_json)
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237 {
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238 pretty_printer pp;
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239 jv.print (&pp);
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240 ASSERT_STREQ (expected_json, pp_formatted_text (&pp));
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241 }
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242
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243 /* Verify that JSON objects are written correctly. We can't test more than
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244 one key/value pair, as we don't impose a guaranteed ordering. */
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245
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246 static void
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247 test_writing_objects ()
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248 {
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249 object obj;
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250 obj.set ("foo", new json::string ("bar"));
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251 assert_print_eq (obj, "{\"foo\": \"bar\"}");
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252 }
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253
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254 /* Verify that JSON arrays are written correctly. */
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255
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256 static void
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257 test_writing_arrays ()
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258 {
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259 array arr;
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260 assert_print_eq (arr, "[]");
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261
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262 arr.append (new json::string ("foo"));
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263 assert_print_eq (arr, "[\"foo\"]");
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264
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265 arr.append (new json::string ("bar"));
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266 assert_print_eq (arr, "[\"foo\", \"bar\"]");
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267 }
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268
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269 /* Verify that JSON numbers are written correctly. */
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270
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271 static void
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272 test_writing_numbers ()
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273 {
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274 assert_print_eq (number (0), "0");
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275 assert_print_eq (number (42), "42");
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276 assert_print_eq (number (-100), "-100");
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277 }
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278
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279 /* Verify that JSON strings are written correctly. */
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280
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281 static void
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282 test_writing_strings ()
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283 {
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284 string foo ("foo");
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285 assert_print_eq (foo, "\"foo\"");
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286
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287 string contains_quotes ("before \"quoted\" after");
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288 assert_print_eq (contains_quotes, "\"before \\\"quoted\\\" after\"");
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289 }
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290
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291 /* Verify that JSON strings are written correctly. */
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292
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293 static void
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294 test_writing_literals ()
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295 {
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296 assert_print_eq (literal (JSON_TRUE), "true");
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297 assert_print_eq (literal (JSON_FALSE), "false");
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298 assert_print_eq (literal (JSON_NULL), "null");
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299 }
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300
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301 /* Run all of the selftests within this file. */
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302
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303 void
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304 json_cc_tests ()
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305 {
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306 test_writing_objects ();
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307 test_writing_arrays ();
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308 test_writing_numbers ();
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309 test_writing_strings ();
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310 test_writing_literals ();
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311 }
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312
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313 } // namespace selftest
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314
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315 #endif /* #if CHECKING_P */
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