benchtests/json-lib.c

   1 /* Simple library for printing JSON data.
   2    Copyright (C) 2014-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <string.h>
  20
  21 #include "json-lib.h"
  22
  23 void
  24 json_init (json_ctx_t *ctx, unsigned int indent_level, FILE *fp)
  25 {
  26   ctx->indent_level = indent_level;
  27   ctx->fp = fp;
  28   ctx->first_element = true;
  29 }
  30
  31 static void
  32 do_indent (json_ctx_t *ctx)
  33 {
  34   char indent_buf[ctx->indent_level + 1];
  35
  36   memset (indent_buf, ' ', ctx->indent_level + 1);
  37   indent_buf[ctx->indent_level] = '\0';
  38
  39   fputs (indent_buf, ctx->fp);
  40 }
  41
  42 void
  43 json_document_begin (json_ctx_t *ctx)
  44 {
  45   do_indent (ctx);
  46
  47   fputs ("{\n", ctx->fp);
  48
  49   ctx->indent_level++;
  50   ctx->first_element = true;
  51 }
  52
  53 void
  54 json_document_end (json_ctx_t *ctx)
  55 {
  56   ctx->indent_level--;
  57
  58   do_indent (ctx);
  59
  60   fputs ("\n}", ctx->fp);
  61 }
  62
  63 void
  64 json_attr_object_begin (json_ctx_t *ctx, const char *name)
  65 {
  66   if (!ctx->first_element)
  67     fprintf (ctx->fp, ",\n");
  68
  69   do_indent (ctx);
  70
  71   fprintf (ctx->fp, "\"%s\": {\n", name);
  72
  73   ctx->indent_level++;
  74   ctx->first_element = true;
  75 }
  76
  77 void
  78 json_attr_object_end (json_ctx_t *ctx)
  79 {
  80   ctx->indent_level--;
  81   ctx->first_element = false;
  82
  83   fputs ("\n", ctx->fp);
  84
  85   do_indent (ctx);
  86
  87   fputs ("}", ctx->fp);
  88 }
  89
  90 void
  91 json_attr_string (json_ctx_t *ctx, const char *name, const char *s)
  92 {
  93   if (!ctx->first_element)
  94     fprintf (ctx->fp, ",\n");
  95   else
  96     ctx->first_element = false;
  97
  98   do_indent (ctx);
  99
 100   fprintf (ctx->fp, "\"%s\": \"%s\"", name, s);
 101 }
 102
 103 void
 104 json_attr_double (json_ctx_t *ctx, const char *name, double d)
 105 {
 106   if (!ctx->first_element)
 107     fprintf (ctx->fp, ",\n");
 108   else
 109     ctx->first_element = false;
 110
 111   do_indent (ctx);
 112
 113   fprintf (ctx->fp, "\"%s\": %g", name, d);
 114 }
 115
 116 void
 117 json_array_begin (json_ctx_t *ctx, const char *name)
 118 {
 119   if (!ctx->first_element)
 120     fprintf (ctx->fp, ",\n");
 121
 122   do_indent (ctx);
 123
 124   fprintf (ctx->fp, "\"%s\": [", name);
 125
 126   ctx->indent_level++;
 127   ctx->first_element = true;
 128 }
 129
 130 void
 131 json_array_end (json_ctx_t *ctx)
 132 {
 133   ctx->indent_level--;
 134   ctx->first_element = false;
 135
 136   fputs ("]", ctx->fp);
 137 }
 138
 139 void
 140 json_element_double (json_ctx_t *ctx, double d)
 141 {
 142   if (!ctx->first_element)
 143     fprintf (ctx->fp, ", %g", d);
 144   else
 145     {
 146       fprintf (ctx->fp, "%g", d);
 147       ctx->first_element = false;
 148     }
 149 }
 150
 151 void
 152 json_element_object_begin (json_ctx_t *ctx)
 153 {
 154   if (!ctx->first_element)
 155     fprintf (ctx->fp, ",");
 156
 157   fputs ("\n", ctx->fp);
 158
 159   do_indent (ctx);
 160
 161   fputs ("{\n", ctx->fp);
 162
 163   ctx->indent_level++;
 164   ctx->first_element = true;
 165 }
 166
 167 void
 168 json_element_object_end (json_ctx_t *ctx)
 169 {
 170   ctx->indent_level--;
 171   ctx->first_element = false;
 172
 173   fputs ("\n", ctx->fp);
 174
 175   do_indent (ctx);
 176
 177   fputs ("}", ctx->fp);
 178 }