C 언어 코딩 도장

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

typedef enum _TOKEN_TPYE {
	TOKEN_STRING,
	TOKEN_NUMBER,
} TOKEN_TPYE;

typedef struct _TOKEN {
	TOKEN_TPYE type;
	union {
		char *string;
		double number;
	};
	bool isArray;
} TOKEN;

#define TOKEN_COUNT 20

typedef struct _JSON {
	TOKEN tokens[TOKEN_COUNT];
} JSON;

char *readFile(char *filename, int *readSize)
{
	FILE *fp=fopen(filename,"rb");
	if(fp==NULL)
		return NULL;
	
	int size;
	char *buffer;
	
	fseek(fp,0,SEEK_END);
	size=ftell(fp);
	fseek(fp,0,SEEK_SET);
	
	buffer=malloc(size+1);
	memset(buffer,0,size+1);
	
	if(fread(buffer,size,1,fp)<1)
	{
		*readSize=0;
		free(buffer);
		fclose(fp);
		return NULL;
	}
	
	*readSize=size;
	
	fclose(fp);
	
	return buffer;
}

void parseJSON(char *doc, int size, JSON *json)
{
	int tokenIndex=0;
	int pos=0;
	
	if(doc[pos]!='{')
		return;
	
	pos++;
	
	while(pos<size)
	{
		switch(doc[pos])
		{
		case'"':
		{
			char *begin = doc + pos + 1;
			
			char *end = strchr(begin,'"');
			if(end==NULL)
				break;
				
			int stringLength=end - begin;
				
			json->tokens[tokenIndex].type = TOKEN_STRING;
			json->tokens[tokenIndex].string=malloc(stringLength+1);
			
			memset(json->tokens[tokenIndex].string,0,stringLength+1);
			memcpy(json->tokens[tokenIndex].string,begin,stringLength);
			
			tokenIndex++;
				
			pos = pos + stringLength+1;
		}
		case'[':
		{
			pos ++;
			
			while(doc[pos] != ']')
			{
				if(doc[pos] == '"')
				{
					char *begin = doc +pos +1;
					char *end = strchr(begin,'"');
					if(end==NULL)
						break;
					
					int stringLength = end-begin;
					
					json->tokens[tokenIndex].type=TOKEN_STRING;
					json->tokens[tokenIndex].string=malloc(stringLength+1);
					json->tokens[tokenIndex].isArray=true;
					
					memset(json->tokens[tokenIndex].string,0,stringLength+1);
					memcpy(json->tokens[tokenIndex].string,begin,stringLength);
					
					tokenIndex++;
					
					pos=pos+stringLength+1;
				}
				pos++;
			}
		}
		case '0': case '1': case '2': case '3': case '4': case'5':
		case '6': case '7': case '8': case '9': case '-':
		{
			char *begin = doc+pos;
			char *end;
			char *buffer;
			
			end=strchr(doc+pos,',');
			if(end==NULL)
			{
				end=strchr(doc+pos,'}');
				if(end==NULL)
					break;
			}
			
			int stringLength=end-begin;
			
			buffer = malloc(sizeof(stringLength+1));
			memset(buffer,0,stringLength+1);
			memcpy(buffer,begin,stringLength);
			
			json->tokens[tokenIndex].type=TOKEN_NUMBER;
			json->tokens[tokenIndex].number=atof(buffer);
			
			free(buffer);
			
			tokenIndex++;
			
			pos=pos+stringLength+1;
		}	
		break;
		}
		pos++;
	}
}

char *getString(JSON *json, char *key)
{
	for(int i=0; i<TOKEN_COUNT; i++)
	{
		if(json->tokens[i].type==TOKEN_STRING && strcmp(json->tokens[i].string,key)==0)
		{
			if(json->tokens[i+1].type==TOKEN_STRING)
				return json->tokens[i+1].string;
		}
	}
	
	return NULL;
}

char *getArrayString(JSON *json, char *key, int index)
{
	for(int i=0; i<TOKEN_COUNT; i++)
	{
		if(json->tokens[i].type==TOKEN_STRING && strcmp(json->tokens[i].string,key)==0)
		{
			if(json->tokens[i+1+index].type==TOKEN_STRING &&
			  json->tokens[i+1+index].isArray==true )
				return json->tokens[i+1+index].string;
		}
	}
	
	return NULL;
}

int getArrayCount(JSON *json, char *key)
{
	for(int i=0; i<TOKEN_COUNT; i++)
	{
		if(json->tokens[i].type==TOKEN_STRING && strcmp(json->tokens[i].string,key)==0)
		{
			int j=0;
			while(json->tokens[i+1+j].isArray==true)
				j++;
			
			return j;
		}
	}
	return 0;
}

double getNumber(JSON *json, char *key)
{
	for(int i=0; i<TOKEN_COUNT; i++)
	{
		if(json->tokens[i].type==TOKEN_STRING && strcmp(json->tokens[i].string,key)==0)
		{
			if(json->tokens[i+1].type==TOKEN_NUMBER)
				return json->tokens[i+1].number;
		}
	}
	return 0.0;
}

void freeJSON(JSON *json)
{
	for(int i=0;i<TOKEN_COUNT; i++)
	{
		if(json->tokens[i].type == TOKEN_STRING)
			free(json->tokens[i].string);
	}
}

int main()
{
	int size;
	char *doc = readFile("example.json",&size);
	
	if(doc == NULL)
		return -1;
	
	JSON json={0,};
	
	parseJSON(doc,size,&json);
	
	printf("Title: %s\n",getString(&json,"Title"));
	printf("Year: %d\n",(int)getNumber(&json,"Year"));
	printf("Runtime: %d\n",(int)getNumber(&json,"Runtime"));
	printf("Genre: %s\n",getString(&json,"Genre"));
	printf("Director: %s\n",getString(&json,"Director"));
	printf("Actor: \n");
	int actors = getArrayCount(&json,"Actor");
	for(int i=0; i<actors; i++)
		printf("  %s\n",getArrayString(&json,"Actor",i));
	
	printf("imdbRating: %f\n",getNumber(&json,"imdbRating"));
	
	freeJSON(&json);
	
	free(doc);
	
	return 0;
}

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