json-c: JSON parsing

json_object_dotget_string(obj, "query.results.channel.location.city");

bool json_object_get_by_query(const json_object *obj, char **q, json_object **val)
{
    json_object *curr = obj;
    json_object *value = NULL;

    for (const char *key = *q; *q; q++)
    {
       if (json_object_object_get_ex(curr, key, &value))
       {
          curr = value;
       }
       else
       {
          return false; /* not found */
       }
    }
    *val = curr;
    return true;
}

int main()
{
    char *q[] = {"aa", "bb", "cc", NULL};

    json_object_get_by_query(..., q, ...);
}

/* root is the JSON array [[1, 2], {"baz": null} */
json_error_t error;
json_unpack_ex(root, &error, JSON_VALIDATE_ONLY, "[[i,i], {s:n}]", "baz");

==22019== HEAP SUMMARY:
==22019==     in use at exit: 0 bytes in 0 blocks
==22019==   total heap usage: 7,073 allocs, 7,073 frees, 715,353 bytes allocated

CML_Node * node;
if (CML_StorableFromFile(yourfilename, &node)) return;

CML_Node * target;
if (CML_NodeFindString(node, "results.channel.location.city.item.condition.temp.text", &target)) return;

printf("%s\n", target->data.string);

%{
#include <stdlib.h>
#include "yw.tab.h"
%}
%%
[{},:] {return yytext[0];}
"[" {return yytext[0];}
"]" {return yytext[0];}
["]"query"["] {return S_query;}
["]"results"["] {return S_results;}
["]"channel"["] {return S_channel;}
["]"location"["] {return S_location;}
["]"city"["] {return S_city;}
["]"item"["] {return S_item;}
["]"condition"["] {return S_condition;}
["]"temp"["] {return S_temp;}
["]"text"["] {return S_text;}
["]"<![CDATA["[^\x5d]*"]]>"["] {yytext[yyleng-1]='\0';
  yylval.str=yytext+1; return S;}
["][^"]*"\"" {yytext[yyleng-1]='\0';
  yylval.str=yytext+1; return S;}
[0-9]+ {yytext[yyleng]='\0';yylval.num=atol(yytext);return N;}
[\n] {;}
. {;}
%%
int yywrap(){return 1;}

%{
#include <stdio.h>
%}
%union {
  long num;
  char *str;
}
%token S_query S_results S_channel
  S_location S_city
  S_item S_condition S_temp S_text
%token<str> S
%token<num> N
%start json
%%
json: | json l | json h ;
l: '[' a1 ']' ;
h: '{' a2 '}' ;
v: S | N | l | h ;
a1: v | a1 ',' v ;
a2: S ':' v | S_text ':' v | S_query ':' '{' b2 '}'
 | a2 ',' S ':' v | a2 ',' S_text ':' v | a2 ',' S_query ':' '{' b2 '}' ;

b2: S ':' v | S_results ':' '{' b3 '}'
 | b2 ',' S ':' v | b2 ',' S_results ':' '{' b3 '}' ;
b3: S ':' v | S_channel ':' '{' b4 '}'
 | b3 ',' S ':' v | b3 ',' S_channel ':' '{' b4 '}' ;
b4: S ':' v | S_location ':' '{' b5 '}' | S_item ':' '{' b6 '}'
 | b4 ',' S ':' v | b4 ',' S_location ':' '{' b5 '}'
 | b4 ',' S_item ':' '{' b6 '}' ;

b5: S ':' v | S_city ':' S {printf("city: '%s'\n",$3);}
 | b5 ',' S ':' v | b5 ',' S_city ':' S {printf("city: '%s'\n",$5);} ;

b6: S ':' v | S_condition ':' '{' b7 '}'
 | b6 ',' S ':' v | b6 ',' S_condition ':' '{' b7 '}' ;
b7: S ':' v
 | S_temp ':' S {printf("temp: '%s'\n",$3);}
 | S_text ':' S {printf("text: '%s'\n",$3);}
 | b7 ',' S ':' v
 | b7 ',' S_temp ':' S {printf("temp: '%s'\n",$5);}
 | b7 ',' S_text ':' S {printf("text: '%s'\n",$5);}
;
%%
int yyerror(char *er){fprintf(stderr,"er:'%s'\n",er);return 0;}
int main(){yyparse();return 0;}

bison -d yw.y
flex yw.l
cc -o yw yw.tab.c lex.yy.c

./yw <yah_we.json