main.c

// main.c


#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#include "common.h"

#include "chunk.h"


#include "debug.h"


#include "vm.h"



static void repl() {
  char line[1024];
  for (;;) {
    printf("> ");

    if (!fgets(line, sizeof(line), stdin)) {
      printf("\n");
      break;
    }

    interpret(line);
  }
}


static char* readFile(const char* path) {
  FILE* file = fopen(path, "rb");

  if (file == NULL) {
    fprintf(stderr, "Could not open file \"%s\".\n", path);
    exit(74);
  }


  fseek(file, 0L, SEEK_END);
  size_t fileSize = ftell(file);
  rewind(file);

  char* buffer = (char*)malloc(fileSize + 1);

  if (buffer == NULL) {
    fprintf(stderr, "Not enough memory to read \"%s\".\n", path);
    exit(74);
  }
  

  size_t bytesRead = fread(buffer, sizeof(char), fileSize, file);

  if (bytesRead < fileSize) {
    fprintf(stderr, "Could not read file \"%s\".\n", path);
    exit(74);
  }
  

  buffer[bytesRead] = '\0';

  fclose(file);
  return buffer;
}


static void runFile(const char* path) {
  char* source = readFile(path);
  InterpretResult result = interpret(source);
  free(source); // [owner]

  if (result == INTERPRET_COMPILE_ERROR) exit(65);
  if (result == INTERPRET_RUNTIME_ERROR) exit(70);
}


int main(int argc, const char* argv[]) {

  initVM();

  if (argc == 1) {
    repl();
  } else if (argc == 2) {
    runFile(argv[1]);
  } else {
    fprintf(stderr, "Usage: clox [path]\n");
    exit(64);
  }
  
  freeVM();

  return 0;
}