#include "stack.h"

stack_j::stack_j():stack(nullptr), top(0), json(nullptr), size(0){}

void* stack_j::push(size_t size){

void* ret;

assert(size > 0);

if (top + size >= this->size) {

if (this->size == 0)

this->size = PARSER_STACK_INIT_SIZE;

while (top + size >= this->size)

this->size += this->size >> 1; /* c->size * 1.5 */

stack = (char*)realloc(stack, this->size);

}

ret = stack + top;

top += size;

return ret;

}

void stack_j::parse_whitespace() {

while(*json == ' ' || *json == '\t' || *json == '\n' || *json == '\r') json++;

}

void* stack_j::pop(size_t size){

assert(this->top >= size);

return this->stack + (this->top -= size);

}

void stack_j::put_char(char c){

char * p = (char*)push(sizeof(char));

*p = c;

}

void stack_j::put_string(const string & s){

}

void stack_j::expect(char c) {

assert(c == *json);

json++;

}