jstree_read.h

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#ifndef _JSTREE_READ_H
#define _JSTREE_READ_H
 
#include <stdarg.h>
 
#define PP_RSEQ_N() \
         127,126,125,124,123,122,121,120, \
         119,118,117,116,115,114,113,112,111,110, \
         109,108,107,106,105,104,103,102,101,100, \
         99,98,97,96,95,94,93,92,91,90, \
         89,88,87,86,85,84,83,82,81,80, \
         79,78,77,76,75,74,73,72,71,70, \
         69,68,67,66,65,64,63,62,61,60, \
         59,58,57,56,55,54,53,52,51,50, \
         49,48,47,46,45,44,43,42,41,40, \
         39,38,37,36,35,34,33,32,31,30, \
         29,28,27,26,25,24,23,22,21,20, \
         19,18,17,16,15,14,13,12,11,10, \
         9,8,7,6,5,4,3,2,1,0
 
#define PP_ARG_N( \
          _1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
         _11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
         _21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
         _31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
         _41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
         _51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
         _61,_62,_63,_64,_65,_66,_67,_68,_69,_70, \
         _71,_72,_73,_74,_75,_76,_77,_78,_79,_80, \
         _81,_82,_83,_84,_85,_86,_87,_88,_89,_90, \
         _91,_92,_93,_94,_95,_96,_97,_98,_99,_100, \
         _101,_102,_103,_104,_105,_106,_107,_108,_109,_110, \
         _111,_112,_113,_114,_115,_116,_117,_118,_119,_120, \
         _121,_122,_123,_124,_125,_126,_127,N,...) N
 
#define PP_NARG_(...) \
         PP_ARG_N(__VA_ARGS__)
 
#define PP_NARG(...) \
         PP_NARG_(__VA_ARGS__,PP_RSEQ_N())
 
static inline int _do_jstree_read(int argc, _tree_node *input, _tree_node **output, ...)
{
    int loop = argc - 2;
    int iter;
    int i;
    va_list ap;
    _tree_node * rnode = input;
 
    argc-= 2;
 
    if(argc < 0){
        return -1;
    }
 
    i = 0;
    va_start(ap, output);
    while( i < loop){
        char *argv;
        argv = va_arg(ap, char *);
        //printf("argv = %s\n", argv);
        if(rnode == 0){
            printf("cannot step forward\n");
            break;
        }
 
        if(sscanf(argv, "[%d]", &iter)){
    //      printf("jumping to the %dth node\n", iter);
            rnode = next_node(rnode, iter);
            if(rnode == 0){
                //printf("->[%d]:N/A", iter);
                break;
            }else if(rnode->data.type == JSMN_STRING){
                //printf("->[%d](string): %s", iter, rnode->data.data);
                if(i + 1 < loop){
                    rnode = rnode->r;
                    if(rnode == 0 ){
                        //printf("cannot move forward");
                        break;
                    }else if(rnode->data.type == JSMN_ARRAY){
                        rnode = rnode->r;
                    //  printf("->(array)");
                    }else if(rnode->data.type == JSMN_OBJECT){
                        rnode = rnode->r;
                    //  printf("->(object)");
                    }
                }
            }else if(rnode->data.type == JSMN_PRIMITIVE){
                //printf("->[%d](primitive): %s", iter, rnode->data.data);
            }else if(rnode->data.type == JSMN_OBJECT){
                //printf("->[%d](object)", iter);
                rnode = rnode->r;
            }else if(rnode->data.type == JSMN_ARRAY){
                //printf("->[%d](array)", iter);
                rnode = rnode->r;
            }else{
                //printf("->[%d]unknonw type %x", iter, rnode->data.type);
                break;
            }
            
        }else{
 
            //printf("->%s", argv);
            rnode = find_node(rnode, argv);
            
            if(rnode == 0){
                //printf("not found");
                break;
            }else if(rnode->r == 0){
                //printf(":has no child");
                break;
            }else if(rnode->r->data.type == JSMN_STRING){
                //printf("->(string): %s", rnode->r->data.data);
                rnode = rnode->r;
                i++;
                break;
            }else if(rnode->r->data.type == JSMN_PRIMITIVE){
                //printf("->(primitive): %s", rnode->r->data.data);
                rnode = rnode->r;
                i++;
                break;
            }else if(rnode->r->data.type == JSMN_OBJECT){
                //printf("->(object)");
                rnode = rnode->r->r;
            }else if(rnode->r->data.type == JSMN_ARRAY){
                //printf("->(array)");
                rnode = rnode->r->r;
            }else{
                //printf("child unknonw type %x", rnode->r->data.type);
                break;
            }
        }
        i++;
    }
    //printf("\n");
    va_end(ap);
 
    //printf("ret = %d\n",ret);
 
    *output = rnode;
 
    return i;
}
 
//#define readJSTree(...) _do_jstree_read(PP_NARG(__VA_ARGS__), __VA_ARGS__)
#define jstree_read(...) _do_jstree_read(PP_NARG(__VA_ARGS__), __VA_ARGS__)
 
#endif