main.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "chunk.h"
#include "debug.h"
#include "vm.h"

static void repl();
static void runFile(const char *path);

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

	if (argc == 0) {
	    repl();
	} else if (argc == 2) {
	    runFile(argv[1]);
	} else {
	    fprintf(stderr, "Usage: clox [path]");
	    exit(64);
	}

	freeVM();
	return 0;
}

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 = (size_t) 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);
    }

    buffer[bytesRead] = '\0';

    fclose(file);
    return buffer;
}

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

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