kuroko.c

 
#define _DEFAULT_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
 
#ifdef __toaru__
#include <toaru/rline.h>
#else
#ifndef NO_RLINE
#include "vendor/rline.h"
#endif
#endif
 
#include <kuroko/kuroko.h>
#include <kuroko/chunk.h>
#include <kuroko/debug.h>
#include <kuroko/vm.h>
#include <kuroko/memory.h>
#include <kuroko/scanner.h>
#include <kuroko/compiler.h>
#include <kuroko/util.h>
 
#define PROMPT_MAIN  ">>> "
#define PROMPT_BLOCK "  > "
 
static int enableRline = 1;
static int exitRepl = 0;
static int pasteEnabled = 0;
static int noColor = 0;
 
KRK_Function(exit) {
    FUNCTION_TAKES_NONE();
    exitRepl = 1;
    return NONE_VAL();
}
 
KRK_Function(paste) {
    int enabled = !pasteEnabled;
    if (!krk_parseArgs("|p",(const char*[]){"enabled"},&enabled)) return NONE_VAL();
    pasteEnabled = enabled;
    fprintf(stderr, "Pasting is %s.\n", pasteEnabled ? "enabled" : "disabled");
    return NONE_VAL();
}
 
static int doRead(char * buf, size_t bufSize) {
#ifndef NO_RLINE
    if (enableRline)
        return rline(buf, bufSize);
    else
#endif
        return read(STDIN_FILENO, buf, bufSize);
}
 
static KrkValue readLine(char * prompt, int promptWidth, char * syntaxHighlighter) {
    struct StringBuilder sb = {0};
 
#ifndef NO_RLINE
    if (enableRline) {
        rline_exit_string = "";
        rline_exp_set_prompts(prompt, "", promptWidth, 0);
        rline_exp_set_syntax(syntaxHighlighter);
        rline_exp_set_tab_complete_func(NULL);
    } else
#endif
    {
        fprintf(stdout, "%s", prompt);
        fflush(stdout);
    }
 
    /* Read a line of input using a method that we can guarantee will be
     * interrupted by signal delivery. */
    while (1) {
        char buf[4096];
        ssize_t bytesRead = doRead(buf, 4096);
        if (krk_currentThread.flags & KRK_THREAD_SIGNALLED) goto _exit;
        if (bytesRead < 0) {
            krk_runtimeError(vm.exceptions->ioError, "%s", strerror(errno));
            goto _exit;
        } else if (bytesRead == 0 && !sb.length) {
            krk_runtimeError(vm.exceptions->baseException, "EOF");
            goto _exit;
        } else {
            pushStringBuilderStr(&sb, buf, bytesRead);
        }
        /* Was there a linefeed? Then we can exit. */
        if (sb.length && sb.bytes[sb.length-1] == '\n') {
            sb.length--;
            break;
        }
    }
 
    return finishStringBuilder(&sb);
 
_exit:
    discardStringBuilder(&sb);
    return NONE_VAL();
}
 
KRK_Function(input) {
    char * prompt = "";
    int promptwidth = 0;
    char * syntax = NULL;
 
    if (!krk_parseArgs("|siz", (const char*[]){"prompt","promptwidth","syntax"},
        &prompt, &promptwidth, &syntax)) return NONE_VAL();
 
    if (promptwidth == 0 && *prompt) {
        promptwidth = strlen(prompt);
    }
 
    return readLine(prompt, promptwidth, syntax);
}
 
static void printResult(FILE * file, KrkValue result) {
    struct StringBuilder sb = {0};
    if (!krk_pushStringBuilderFormat(&sb, noColor ? " => %R\n" : " \033[1;90m=> %R\033[0m\n", result)) {
        krk_dumpTraceback();
    } else {
        fwrite(sb.bytes,1,sb.length,file);
    }
    krk_discardStringBuilder(&sb);
}
 
#ifndef NO_RLINE
static KrkValue findFromProperty(KrkValue current, KrkToken next) {
    KrkValue member = OBJECT_VAL(krk_copyString(next.start, next.literalWidth));
    krk_push(member);
    KrkValue value = krk_valueGetAttribute_default(current, AS_CSTRING(member), NONE_VAL());
    krk_pop();
    return value;
}
 
static char * syn_krk_keywords[] = {
    "and","class","def","else","for","if","in","import","del",
    "let","not","or","return","while","try","except","raise",
    "continue","break","as","from","elif","lambda","with","is",
    "pass","assert","yield","finally","async","await",
    "True","False","None",
    NULL
};
 
static void tab_complete_func(rline_context_t * c) {
    /* Figure out where the cursor is and if we should be completing anything. */
    if (c->offset) {
        size_t stackIn = krk_currentThread.stackTop - krk_currentThread.stack;
        /* Copy up to the cursor... */
        char * tmp = malloc(c->offset + 1);
        memcpy(tmp, c->buffer, c->offset);
        tmp[c->offset] = '\0';
        /* and pass it to the scanner... */
        KrkScanner scanner = krk_initScanner(tmp);
        /* Logically, there can be at most (offset) tokens, plus some wiggle room. */
        KrkToken * space = malloc(sizeof(KrkToken) * (c->offset + 2));
        int count = 0;
        do {
            space[count++] = krk_scanToken(&scanner);
        } while (space[count-1].type != TOKEN_EOF && space[count-1].type != TOKEN_ERROR);
 
        /* If count == 1, it was EOF or an error and we have nothing to complete. */
        if (count == 1) {
            goto _cleanup;
        }
 
        /* Otherwise we want to see if we're on an identifier or a dot. */
        int base = 2;
        int n = base;
        if (space[count-base].type == TOKEN_DOT) {
            /* Dots we need to look back at the previous tokens for */
            n--;
            base--;
        } else if (space[count-base].type >= TOKEN_IDENTIFIER && space[count-base].type <= TOKEN_WITH) {
            /* Something alphanumeric; only for the last element */
        } else {
            /* Some other symbol */
            goto _cleanup;
        }
 
        /* Work backwards to find the start of this chain of identifiers */
        while (n < count) {
            if (space[count-n-1].type != TOKEN_DOT) break;
            n++;
            if (n == count) break;
            if (space[count-n-1].type != TOKEN_IDENTIFIER) break;
            n++;
        }
 
        if (n <= count) {
            /* Now work forwards, starting from the current globals. */
            KrkValue root = OBJECT_VAL(krk_currentThread.module);
            int isGlobal = 1;
            while (n > base) {
                /* And look at the potential fields for instances/classes */
                KrkValue next = findFromProperty(root, space[count-n]);
                if (IS_NONE(next)) {
                    /* If we hit None, we found something invalid (or literally hit a None
                     * object, but really the difference is minimal in this case: Nothing
                     * useful to tab complete from here. */
                    if (!isGlobal) goto _cleanup;
                    /* Does this match a builtin? */
                    if (!krk_tableGet_fast(&vm.builtins->fields,
                        krk_copyString(space[count-n].start,space[count-n].literalWidth), &next) || IS_NONE(next)) {
                        goto _cleanup;
                    }
                }
                isGlobal = 0;
                root = next;
                n -= 2; /* To skip every other dot. */
            }
 
            if (isGlobal && n < count && (space[count-n-1].type == TOKEN_IMPORT || space[count-n-1].type == TOKEN_FROM)) {
                KrkInstance * modules = krk_newInstance(vm.baseClasses->objectClass);
                root = OBJECT_VAL(modules);
                krk_push(root);
                for (size_t i = 0; i < vm.modules.capacity; ++i) {
                    KrkTableEntry * entry = &vm.modules.entries[i];
                    if (IS_KWARGS(entry->key)) continue;
                    krk_attachNamedValue(&modules->fields, AS_CSTRING(entry->key), NONE_VAL());
                }
            }
 
            /* Now figure out what we're completing - did we already have a partial symbol name? */
            int length = (space[count-base].type == TOKEN_DOT) ? 0 : (space[count-base].length);
            isGlobal = isGlobal && (length != 0);
 
            /* Collect up to 256 of those that match */
            char * matches[256];
            int matchCount = 0;
 
            /* Take the last symbol name from the chain and get its member list from dir() */
 
            for (;;) {
                KrkValue dirList = krk_dirObject(1,(KrkValue[]){root},0);
                krk_push(dirList);
                if (!IS_INSTANCE(dirList)) {
                    fprintf(stderr,"\nInternal error while tab completting.\n");
                    goto _cleanup;
                }
 
                for (size_t i = 0; i < AS_LIST(dirList)->count; ++i) {
                    KrkString * s = AS_STRING(AS_LIST(dirList)->values[i]);
                    krk_push(OBJECT_VAL(s));
                    KrkToken asToken = {.start = s->chars, .literalWidth = s->length};
                    KrkValue thisValue = findFromProperty(root, asToken);
                    krk_push(thisValue);
                    if (IS_CLOSURE(thisValue) || IS_BOUND_METHOD(thisValue) || IS_NATIVE(thisValue)) {
                        size_t allocSize = s->length + 2;
                        char * tmp = malloc(allocSize);
                        size_t len = snprintf(tmp, allocSize, "%s(", s->chars);
                        s = krk_takeString(tmp, len);
                        krk_pop();
                        krk_push(OBJECT_VAL(s));
                    } else {
                        krk_pop();
                    }
 
                    /* If this symbol is shorter than the current submatch, skip it. */
                    if (length && (int)s->length < length) continue;
 
                    /* See if it's already in the matches */
                    int found = 0;
                    for (int i = 0; i < matchCount; ++i) {
                        if (!strcmp(matches[i], s->chars)) {
                            found = 1;
                            break;
                        }
                    }
                    if (found) continue;
 
                    if (!memcmp(s->chars, space[count-base].start, length)) {
                        matches[matchCount] = s->chars;
                        matchCount++;
                        if (matchCount == 255) goto _toomany;
                    }
                }
 
                /*
                 * If the object we were scanning was the current module,
                 * then we should also throw the builtins into the ring.
                 */
                if (isGlobal && AS_OBJECT(root) == (KrkObj*)krk_currentThread.module) {
                    root = OBJECT_VAL(vm.builtins);
                    continue;
                } else if (isGlobal && AS_OBJECT(root) == (KrkObj*)vm.builtins) {
                    KrkInstance * fakeKeywordsObject = krk_newInstance(vm.baseClasses->objectClass);
                    root = OBJECT_VAL(fakeKeywordsObject);
                    krk_push(root);
                    for (char ** keyword = syn_krk_keywords; *keyword; keyword++) {
                        krk_attachNamedValue(&fakeKeywordsObject->fields, *keyword, NONE_VAL());
                    }
                    continue;
                } else {
                    break;
                }
            }
_toomany:
 
            /* Now we can do things with the matches. */
            if (matchCount == 1) {
                /* If there was only one, just fill it. */
                rline_insert(c, matches[0] + length);
                rline_place_cursor();
            } else if (matchCount) {
                /* Otherwise, try to find a common substring among them... */
                int j = length;
                while (1) {
                    char m = matches[0][j];
                    if (!m) break;
                    int diff = 0;
                    for (int i = 1; i < matchCount; ++i) {
                        if (matches[i][j] != m) {
                            diff = 1;
                            break;
                        }
                    }
                    if (diff) break;
                    j++;
                }
                /* If no common sub string could be filled in, we print the list. */
                if (j == length) {
                    /* First find the maximum width of an entry */
                    int maxWidth = 0;
                    for (int i = 0; i < matchCount; ++i) {
                        if ((int)strlen(matches[i]) > maxWidth) maxWidth = strlen(matches[i]);
                    }
                    /* Now how many can we fit in a screen */
                    int colsPerLine = rline_terminal_width / (maxWidth + 2); /* +2 for the spaces */
                    fprintf(stderr, "\n");
                    int column = 0;
                    for (int i = 0; i < matchCount; ++i) {
                        fprintf(stderr, "%-*s  ", maxWidth, matches[i]);
                        column += 1;
                        if (column >= colsPerLine) {
                            fprintf(stderr, "\n");
                            column = 0;
                        }
                    }
                    if (column != 0) fprintf(stderr, "\n");
                } else {
                    /* If we do have a common sub string, fill in those characters. */
                    for (int i = length; i < j; ++i) {
                        char tmp[2] = {matches[0][i], '\0'};
                        rline_insert(c, tmp);
                    }
                }
            }
        }
_cleanup:
        free(tmp);
        free(space);
        krk_currentThread.stackTop = &krk_currentThread.stack[stackIn];
        return;
    }
}
#endif
 
#ifndef KRK_DISABLE_DEBUG
static char * lastDebugCommand = NULL;
static int debuggerHook(KrkCallFrame * frame) {
 
    /* File information */
    fprintf(stderr, "At offset 0x%04lx of function '%s' from '%s' on line %lu:\n",
        (unsigned long)(frame->ip - frame->closure->function->chunk.code),
        frame->closure->function->name->chars,
        frame->closure->function->chunk.filename->chars,
        (unsigned long)krk_lineNumber(&frame->closure->function->chunk,
            (unsigned long)(frame->ip - frame->closure->function->chunk.code)));
 
    /* Opcode trace */
    krk_disassembleInstruction(
        stderr,
        frame->closure->function,
        (size_t)(frame->ip - frame->closure->function->chunk.code));
 
    krk_debug_dumpStack(stderr, frame);
 
    while (1) {
        char buf[4096] = {0};
#ifndef NO_RLINE
        if (enableRline) {
            rline_exit_string="";
            rline_exp_set_prompts("(dbg) ", "", 6, 0);
            rline_exp_set_syntax("krk-dbg");
            rline_exp_set_tab_complete_func(NULL);
            if (rline(buf, 4096) == 0) goto _dbgQuit;
        } else {
#endif
            fprintf(stderr, "(dbg) ");
            fflush(stderr);
            char * out = fgets(buf, 4096, stdin);
            if (!out || !strlen(buf)) {
                fprintf(stdout, "^D\n");
                goto _dbgQuit;
            }
#ifndef NO_RLINE
        }
#endif
 
        char * nl = strstr(buf,"\n");
        if (nl) *nl = '\0';
 
        if (!strlen(buf)) {
            if (lastDebugCommand) {
                strcpy(buf, lastDebugCommand);
            } else {
                continue;
            }
        } else {
#ifndef NO_RLINE
            if (enableRline) {
                rline_history_insert(strdup(buf));
                rline_scroll = 0;
            }
#endif
            if (lastDebugCommand) free(lastDebugCommand);
            lastDebugCommand = strdup(buf);
        }
 
        /* Try to tokenize the first bit */
        char * arg = NULL;
        char * sp = strstr(buf," ");
        if (sp) {
            *sp = '\0';
            arg = sp + 1;
        }
        /* Now check commands */
        if (!strcmp(buf, "c") || !strcmp(buf,"continue")) {
            return KRK_DEBUGGER_CONTINUE;
        } else if (!strcmp(buf, "s") || !strcmp(buf, "step")) {
            return KRK_DEBUGGER_STEP;
        } else if (!strcmp(buf, "abort")) {
            return KRK_DEBUGGER_ABORT;
        } else if (!strcmp(buf, "q") || !strcmp(buf, "quit")) {
            return KRK_DEBUGGER_QUIT;
        } else if (!strcmp(buf, "bt") || !strcmp(buf, "backtrace")) {
            krk_debug_dumpTraceback();
        } else if (!strcmp(buf, "p") || !strcmp(buf, "print")) {
            if (!arg) {
                fprintf(stderr, "print requires an argument\n");
            } else {
                size_t frameCount = krk_currentThread.frameCount;
                /* Compile statement */
                KrkCodeObject * expression = krk_compile(arg,"<debugger>");
                if (expression) {
                    /* Make sure stepping is disabled first. */
                    krk_debug_disableSingleStep();
                    /* Turn our compiled expression into a callable. */
                    krk_push(OBJECT_VAL(expression));
                    krk_push(OBJECT_VAL(krk_newClosure(expression, OBJECT_VAL(krk_currentThread.module))));
                    krk_swap(1);
                    krk_pop();
                    /* Stack silliness, don't ask. */
                    krk_push(NONE_VAL());
                    krk_pop();
                    /* Call the compiled expression with no args. */
                    krk_push(krk_callStack(0));
                    printResult(stderr, krk_peek(0));
                    krk_pop();
                }
                if (krk_currentThread.flags & KRK_THREAD_HAS_EXCEPTION) {
                    krk_dumpTraceback();
                    krk_currentThread.flags &= ~(KRK_THREAD_HAS_EXCEPTION);
                }
                krk_currentThread.frameCount = frameCount;
            }
        } else if (!strcmp(buf, "break") || !strcmp(buf, "b")) {
            char * filename = arg;
            if (!filename) {
                fprintf(stderr, "usage: break FILE LINE [type]\n");
                continue;
            }
 
            char * lineno = strstr(filename, " ");
            if (!lineno) {
                fprintf(stderr, "usage: break FILE LINE [type]\n");
                continue;
            }
 
            /* Advance whitespace */
            *lineno = '\0';
            lineno++;
 
            /* collect optional type */
            int flags = KRK_BREAKPOINT_NORMAL;
            char * type = strstr(lineno, " ");
            if (type) {
                *type = '\0'; type++;
                if (!strcmp(type, "repeat") || !strcmp(type,"r")) {
                    flags = KRK_BREAKPOINT_REPEAT;
                } else if (!strcmp(type, "once") || !strcmp(type,"o")) {
                    flags = KRK_BREAKPOINT_ONCE;
                } else {
                    fprintf(stderr, "Unrecognized breakpoint type: %s\n", type);
                    continue;
                }
            }
 
            int lineInt = atoi(lineno);
            int result = krk_debug_addBreakpointFileLine(krk_copyString(filename, strlen(filename)), lineInt, flags);
 
            if (result == -1) {
                fprintf(stderr, "Sorry, couldn't add breakpoint.\n");
            } else {
                fprintf(stderr, "Breakpoint %d enabled.\n", result);
            }
 
        } else if (!strcmp(buf, "i") || !strcmp(buf, "info")) {
            if (!arg) {
                fprintf(stderr, " info breakpoints - Show breakpoints.\n");
                continue;
            }
 
            if (!strcmp(arg,"breakpoints")) {
                KrkCodeObject * codeObject = NULL;
                size_t offset = 0;
                int flags = 0;
                int enabled = 0;
                int breakIndex = 0;
                while (1) {
                    int result = krk_debug_examineBreakpoint(breakIndex, &codeObject, &offset, &flags, &enabled);
                    if (result == -1) break;
                    if (result == -2) continue;
 
                    fprintf(stderr, "%-4d in %s+%d %s %s\n",
                        breakIndex,
                        codeObject->name->chars,
                        (int)offset,
                        flags == KRK_BREAKPOINT_NORMAL ? "normal":
                                flags == KRK_BREAKPOINT_REPEAT ? "repeat" :
                                    flags == KRK_BREAKPOINT_ONCE ? "once" : "?",
                        enabled ? "enabled" : "disabled");
 
                    breakIndex++;
                }
            } else {
                fprintf(stderr, "Unrecognized info object: %s\n", arg);
            }
 
        } else if (!strcmp(buf, "e") || !strcmp(buf, "enable")) {
            if (!arg) {
                fprintf(stderr, "enable requires an argument\n");
                continue;
            }
 
            int breakIndex = atoi(arg);
 
            if (krk_debug_enableBreakpoint(breakIndex)) {
                fprintf(stderr, "Invalid breakpoint handle.\n");
            } else {
                fprintf(stderr, "Breakpoint %d enabled.\n", breakIndex);
            }
        } else if (!strcmp(buf, "d") || !strcmp(buf, "disable")) {
            if (!arg) {
                fprintf(stderr, "disable requires an argument\n");
                continue;
            }
 
            int breakIndex = atoi(arg);
 
            if (krk_debug_disableBreakpoint(breakIndex)) {
                fprintf(stderr, "Invalid breakpoint handle.\n");
            } else {
                fprintf(stderr, "Breakpoint %d disabled.\n", breakIndex);
            }
        } else if (!strcmp(buf, "r") || !strcmp(buf, "remove")) {
            if (!arg) {
                fprintf(stderr, "remove requires an argument\n");
                continue;
            }
 
            int breakIndex = atoi(arg);
 
            if (krk_debug_removeBreakpoint(breakIndex)) {
                fprintf(stderr, "Invalid breakpoint handle.\n");
            } else {
                fprintf(stderr, "Breakpoint %d removed.\n", breakIndex);
            }
        } else if (!strcmp(buf, "help")) {
            fprintf(stderr,
                "Kuroko Interactive Debugger\n"
                "  c   continue  - Continue until the next breakpoint.\n"
                "  s   step      - Execute this instruction and return to the debugger.\n"
                "  bt  backtrace - Print a backtrace.\n"
                "  q   quit      - Exit the interpreter.\n"
                "      abort     - Abort the interpreter (may create a core dump).\n"
                "  b   break ... - Set a breakpoint.\n"
                "  e   enable N  - Enable breakpoint 'N'.\n"
                "  d   disable N - Disable breakpoint 'N'.\n"
                "  r   remove N  - Remove breakpoint 'N'.\n"
                "  i   info ...  - See information about breakpoints.\n"
                "\n"
                "Empty input lines will repeat the last command.\n"
            );
        } else {
            fprintf(stderr, "Unrecognized command: %s\n", buf);
        }
 
    }
 
    return KRK_DEBUGGER_CONTINUE;
_dbgQuit:
    return KRK_DEBUGGER_QUIT;
}
#endif
 
static void handleSigint(int sigNum) {
    /* Don't set the signal flag if the VM is not running */
    krk_currentThread.flags |= KRK_THREAD_SIGNALLED;
}
 
#ifndef _WIN32
static void handleSigtrap(int sigNum) {
    krk_currentThread.flags |= KRK_THREAD_SINGLE_STEP;
}
#endif
 
static void bindSignalHandlers(void) {
#if !defined(_WIN32)
    struct sigaction sigIntAction;
    sigIntAction.sa_handler = handleSigint;
    sigemptyset(&sigIntAction.sa_mask);
    sigIntAction.sa_flags = 0; /* Do not restore the default, do not restart syscalls, do not pass go, do not collect $500 */
    sigaction(
        SIGINT, /* ^C for keyboard interrupts */
        &sigIntAction,
        NULL);
 
    struct sigaction sigTrapAction;
    sigTrapAction.sa_handler = handleSigtrap;
    sigemptyset(&sigTrapAction.sa_mask);
    sigTrapAction.sa_flags = 0;
    sigaction(
        SIGTRAP,
        &sigTrapAction,
        NULL);
#else
    signal(SIGINT, handleSigint);
#endif
}
 
static void findInterpreter(char * argv[]) {
#ifdef _WIN32
    vm.binpath = strdup(_pgmptr);
#else
    /* Try asking /proc */
    char tmp[4096];
    char * binpath = realpath("/proc/self/exe", NULL);
    if (!binpath || (access(binpath, X_OK) != 0)) {
        if (binpath) {
            free(binpath);
            binpath = NULL;
        }
        if (strchr(argv[0], '/')) {
            binpath = realpath(argv[0], NULL);
        } else {
            /* Search PATH for argv[0] */
            char * p = getenv("PATH");
            if (!p) return;
            char * _path = strdup(p);
            char * path = _path;
            while (path) {
                char * next = strchr(path,':');
                if (next) *next++ = '\0';
 
                snprintf(tmp, 4096, "%s/%s", path, argv[0]);
                if (access(tmp, X_OK) == 0) {
                    binpath = strdup(tmp);
                    break;
                }
                path = next;
            }
            free(_path);
        }
    }
    if (binpath) {
        vm.binpath = binpath;
    } /* Else, give up at this point and just don't attach it at all. */
#endif
}
 
static int runString(char * argv[], int flags, char * string) {
    findInterpreter(argv);
    krk_initVM(flags);
    krk_startModule("__main__");
    krk_attachNamedValue(&krk_currentThread.module->fields,"__doc__", NONE_VAL());
    krk_interpret(string, "<stdin>");
    krk_freeVM();
    return 0;
}
 
static int compileFile(char * argv[], int flags, char * fileName) {
    findInterpreter(argv);
    krk_initVM(flags);
 
    /* Open the file. */
    FILE * f = fopen(fileName,"r");
    if (!f) {
        fprintf(stderr, "%s: could not read file '%s': %s\n", argv[0], fileName, strerror(errno));
        return 1;
    }
 
    /* Read it like we normally do... */
    fseek(f, 0, SEEK_END);
    size_t size = ftell(f);
    fseek(f, 0, SEEK_SET);
    char * buf = malloc(size+1);
    if (fread(buf, 1, size, f) == 0) return 2;
    fclose(f);
    buf[size] = '\0';
 
    /* Set up a module scope */
    krk_startModule("__main__");
 
    /* Call the compiler directly. */
    KrkCodeObject * func = krk_compile(buf, fileName);
 
    /* See if there was an exception. */
    if (krk_currentThread.flags & KRK_THREAD_HAS_EXCEPTION) {
        krk_dumpTraceback();
    }
 
    /* Free the source string */
    free(buf);
 
    /* Close out the compiler */
    krk_freeVM();
 
    return func == NULL;
}
 
int main(int argc, char * argv[]) {
#ifdef _WIN32
    SetConsoleOutputCP(65001);
    SetConsoleCP(65001);
#endif
    char * runCmd = NULL;
    int flags = 0;
    int moduleAsMain = 0;
    int inspectAfter = 0;
    int opt;
    int maxDepth = -1;
    while ((opt = getopt(argc, argv, "+:c:C:dgGim:rR:tTMSV-:")) != -1) {
        switch (opt) {
            case 'c':
                runCmd = optarg;
                goto _finishArgs;
            case 'd':
                /* Disassemble code blocks after compilation. */
                flags |= KRK_THREAD_ENABLE_DISASSEMBLY;
                break;
            case 'g':
                /* Always garbage collect during an allocation. */
                flags |= KRK_GLOBAL_ENABLE_STRESS_GC;
                break;
            case 'G':
                flags |= KRK_GLOBAL_REPORT_GC_COLLECTS;
                break;
            case 'S':
                flags |= KRK_THREAD_SINGLE_STEP;
                break;
            case 't':
                /* Disassemble instructions as they are executed. */
                flags |= KRK_THREAD_ENABLE_TRACING;
                break;
            case 'i':
                inspectAfter = 1;
                break;
            case 'm':
                moduleAsMain = 1;
                optind--; /* to get us back to optarg */
                goto _finishArgs;
            case 'r':
                enableRline = 0;
                break;
            case 'R':
                maxDepth = atoi(optarg);
                break;
            case 'M':
                return runString(argv,0,"import kuroko; print(kuroko.module_paths)\n");
            case 'V':
                return runString(argv,0,"import kuroko; print('Kuroko',kuroko.version)\n");
            case 'C':
                return compileFile(argv,flags,optarg);
            case ':':
                fprintf(stderr, "%s: option '%c' requires an argument\n", argv[0], optopt);
                return 1;
            case '?':
                if (optopt != '-') {
                    fprintf(stderr, "%s: unrecognized option '%c'\n", argv[0], optopt);
                    return 1;
                }
                optarg = argv[optind]+2;
                /* fall through */
            case '-':
                if (!strcmp(optarg,"version")) {
                    return runString(argv,0,"import kuroko; print('Kuroko',kuroko.version)\n");
                } else if (!strcmp(optarg,"help")) {
#ifndef KRK_NO_DOCUMENTATION
                    fprintf(stderr,"usage: %s [flags] [FILE...]\n"
                        "\n"
                        "Interpreter options:\n"
                        " -d          Debug output from the bytecode compiler.\n"
                        " -g          Collect garbage on every allocation.\n"
                        " -G          Report GC collections.\n"
                        " -i          Enter repl after a running -c, -m, or FILE.\n"
                        " -m mod      Run a module as a script.\n"
                        " -r          Disable complex line editing in the REPL.\n"
                        " -R depth    Set maximum recursion depth.\n"
                        " -t          Disassemble instructions as they are exceuted.\n"
                        " -C file     Compile 'file', but do not execute it.\n"
                        " -M          Print the default module import paths.\n"
                        " -S          Enable single-step debugging.\n"
                        " -V          Print version information.\n"
                        "\n"
                        " --version   Print version information.\n"
                        " --help      Show this help text.\n"
                        "\n"
                        "If no files are provided, the interactive REPL will run.\n",
                        argv[0]);
#endif
                    return 0;
                } else {
                    fprintf(stderr,"%s: unrecognized option '--%s'\n",
                        argv[0], optarg);
                    return 1;
                }
        }
    }
 
_finishArgs:
    findInterpreter(argv);
    krk_initVM(flags);
 
    if (maxDepth != -1) {
        krk_setMaximumRecursionDepth(maxDepth);
    }
 
#ifndef KRK_DISABLE_DEBUG
    krk_debug_registerCallback(debuggerHook);
#endif
 
    /* Attach kuroko.argv - argv[0] will be set to an empty string for the repl */
    if (argc == optind) krk_push(OBJECT_VAL(krk_copyString("",0)));
    for (int arg = optind; arg < argc; ++arg) {
        krk_push(OBJECT_VAL(krk_copyString(argv[arg],strlen(argv[arg]))));
    }
    KrkValue argList = krk_callNativeOnStack(argc - optind + (optind == argc), &krk_currentThread.stackTop[-(argc - optind + (optind == argc))], 0, krk_list_of);
    krk_push(argList);
    krk_attachNamedValue(&vm.system->fields, "argv", argList);
    krk_pop();
    for (int arg = optind; arg < argc + (optind == argc); ++arg) krk_pop();
 
    /* Bind interrupt signal */
    bindSignalHandlers();
 
#ifdef KRK_BUNDLE_LIBS
    /* Define KRK_BUNDLE_LIBS like "BUNDLE(os);BUNDLE(math);", etc. */
#define BUNDLED(name) do { \
    extern KrkValue krk_module_onload_ ## name (KrkString*); \
    KrkValue moduleOut = krk_module_onload_ ## name (NULL); \
    krk_attachNamedValue(&vm.modules, # name, moduleOut); \
    krk_attachNamedObject(&AS_INSTANCE(moduleOut)->fields, "__name__", (KrkObj*)krk_copyString(#name, sizeof(#name)-1)); \
    krk_attachNamedValue(&AS_INSTANCE(moduleOut)->fields, "__file__", NONE_VAL()); \
} while (0)
    KRK_BUNDLE_LIBS
#undef BUNDLED
#endif
 
    KrkValue result = INTEGER_VAL(0);
 
    char * env_KUROKOPATH = getenv("KUROKOPATH");
 
    if (env_KUROKOPATH) {
        /* Build a path by splitting */
        krk_push(OBJECT_VAL(krk_copyString(env_KUROKOPATH,strlen(env_KUROKOPATH))));
        krk_push(OBJECT_VAL(S(":")));
 
        /* Split into list */
        KrkValue list = krk_string_split(2,(KrkValue[]){krk_peek(1),krk_peek(0)},0);
        krk_push(list);
        krk_swap(2);
        krk_pop(); /* colon */
        krk_pop(); /* path */
 
        /* Extend with current module_paths */
        krk_push(krk_valueGetAttribute(OBJECT_VAL(vm.system), "module_paths"));
 
        extern FUNC_SIG(list,extend);
        FUNC_NAME(list,extend)(2,(KrkValue[]){krk_peek(1),krk_peek(0)},0);
 
        /* Store */
        krk_attachNamedValue(&vm.system->fields, "module_paths", list);
 
        /* Clean up our mess */
        krk_pop();
        krk_pop(); /* list */
    }
 
    char * env_NO_COLOR = getenv("NO_COLOR");
 
    if (env_NO_COLOR && *env_NO_COLOR) noColor = 1;
 
    KRK_DOC(BIND_FUNC(vm.builtins,input), "@brief Read a line of input.\n"
        "@arguments prompt='',promptwidth=0,syntax=None\n\n"
        "Read a line of input from @c stdin. If the @c rline library is available, "
        "it will be used to gather input. Input reading stops on end-of file or when "
        "a read ends with a line feed, which will be removed from the returned string. "
        "If a prompt is provided, it will be printed without a line feed before requesting "
        "input. If @c rline is available, the prompt will be passed to the library as the "
        "left-hand prompt string. If not provided, @p promptwidth will default to the width "
        "of @p prompt in codepoints; if you are providing a prompt with escape characters or "
        "characters with multi-column East-Asian Character Width be sure to pass a value "
        "for @p promptwidth that reflects the display width of your prompt. "
        "If provided, @p syntax specifies the name of an @c rline syntax module to "
        "provide color highlighting of the input line.");
 
    if (moduleAsMain) {
        int out = !krk_importModule(AS_STRING(AS_LIST(argList)->values[0]), S("__main__"));
        if (krk_currentThread.flags & KRK_THREAD_HAS_EXCEPTION) {
            krk_dumpTraceback();
            krk_resetStack();
        }
        if (!inspectAfter) return out;
        if (IS_INSTANCE(krk_peek(0))) {
            krk_currentThread.module = AS_INSTANCE(krk_peek(0));
        }
    } else if (optind != argc) {
        krk_startModule("__main__");
        result = krk_runfile(argv[optind],argv[optind]);
        if (IS_NONE(result) && krk_currentThread.flags & KRK_THREAD_HAS_EXCEPTION) result = INTEGER_VAL(1);
    }
 
    if (!krk_currentThread.module) {
        /* The repl runs in the context of a top-level module so each input
         * line can share a globals state with the others. */
        krk_startModule("__main__");
        krk_attachNamedValue(&krk_currentThread.module->fields,"__doc__", NONE_VAL());
    }
 
    if (runCmd) {
        result = krk_interpret(runCmd, "<stdin>");
    }
 
    if ((!moduleAsMain && !runCmd && optind == argc) || inspectAfter) {
        /* Add builtins for the repl, but hide them from the globals() list. */
        KRK_DOC(BIND_FUNC(vm.builtins,exit), "@brief Exit the interactive repl.\n\n"
            "Only available from the interactive interpreter; exits the repl.");
        KRK_DOC(BIND_FUNC(vm.builtins,paste), "@brief Toggle paste mode.\n"
            "@arguments enabled=None\n\n"
            "Toggles paste-safe mode, disabling automatic indentation in the repl. "
            "If @p enabled is specified, the mode can be directly specified, otherwise "
            "it will be set to the opposite of the current mode. The new mode will be "
            "printed to stderr.");
 
        if (vm.system) {
            KrkValue version, buildenv, builddate;
            krk_tableGet_fast(&vm.system->fields, S("version"), &version);
            krk_tableGet_fast(&vm.system->fields, S("buildenv"), &buildenv);
            krk_tableGet_fast(&vm.system->fields, S("builddate"), &builddate);
 
            fprintf(stdout, "Kuroko %s (%s) with %s\n",
                AS_CSTRING(version), AS_CSTRING(builddate), AS_CSTRING(buildenv));
        }
 
        fprintf(stdout, "Type `help` for guidance, `paste()` to toggle automatic indentation, `license` for copyright information.\n");
 
        while (!exitRepl) {
            size_t lineCapacity = 8;
            size_t lineCount = 0;
            char ** lines = KRK_ALLOCATE(char *, lineCapacity);
            size_t totalData = 0;
            int valid = 1;
            char * allData = NULL;
            int inBlock = 0;
            int blockWidth = 0;
 
#ifndef NO_RLINE
            /* Main prompt is >>> like in Python */
            rline_exp_set_prompts(PROMPT_MAIN, "", 4, 0);
            /* Set ^D to send EOF */
            rline_exit_string="";
            /* Enable syntax highlight for Kuroko */
            rline_exp_set_syntax("krk");
            /* Bind a callback for \t */
            rline_exp_set_tab_complete_func(tab_complete_func);
#endif
 
            while (1) {
                /* This would be a nice place for line editing */
                char buf[4096] = {0};
 
#ifndef NO_RLINE
                if (inBlock) {
                    /* When entering multiple lines, the additional lines
                     * will show a single > (and keep the left side aligned) */
                    rline_exp_set_prompts(PROMPT_BLOCK, "", 4, 0);
                    /* Also add indentation as necessary */
                    if (!pasteEnabled) {
                        rline_preload = malloc(blockWidth + 1);
                        for (int i = 0; i < blockWidth; ++i) {
                            rline_preload[i] = ' ';
                        }
                        rline_preload[blockWidth] = '\0';
                    }
                }
 
                if (!enableRline) {
#else
                if (1) {
#endif
                    fprintf(stdout, "%s", inBlock ? PROMPT_BLOCK : PROMPT_MAIN);
                    fflush(stdout);
                }
 
#ifndef NO_RLINE
                rline_scroll = 0;
                if (enableRline) {
                    if (rline(buf, 4096) == 0) {
                        valid = 0;
                        exitRepl = 1;
                        break;
                    }
                } else {
#endif
                    char * out = fgets(buf, 4096, stdin);
                    if (krk_currentThread.flags & KRK_THREAD_SIGNALLED) {
                        fprintf(stdout, "\n");
                    } else if ((!out || !strlen(buf))) {
                        fprintf(stdout, "^D\n");
                        valid = 0;
                        exitRepl = 1;
                        break;
                    }
#ifndef NO_RLINE
                }
#endif
                if (krk_currentThread.flags & KRK_THREAD_SIGNALLED) {
                    /* We should actually be properly raising the interrupt and printing it with an empty traceback, but whatever. */
                    krk_currentThread.flags &= ~(KRK_THREAD_SIGNALLED); /* Clear signal flag */
                    fprintf(stderr, "KeyboardInterrupt\n");
                    valid = 0;
                    break;
                }
 
                if (buf[strlen(buf)-1] != '\n') {
                    /* rline shouldn't allow this as it doesn't accept ^D to submit input
                     * unless the line is empty, but just in case... */
                    fprintf(stderr, "Expected end of line in repl input. Did you ^D early?\n");
                    valid = 0;
                    break;
                }
 
                if (lineCapacity < lineCount + 1) {
                    /* If we need more space, grow as needed... */
                    size_t old = lineCapacity;
                    lineCapacity = KRK_GROW_CAPACITY(old);
                    lines = KRK_GROW_ARRAY(char *,lines,old,lineCapacity);
                }
 
                int i = lineCount++;
                lines[i] = strdup(buf);
 
                size_t lineLength = strlen(lines[i]);
                totalData += lineLength;
 
                /* Figure out indentation */
                int isSpaces = 1;
                int countSpaces = 0;
                for (size_t j = 0; j < lineLength; ++j) {
                    if (lines[i][j] != ' ' && lines[i][j] != '\n') {
                        isSpaces = 0;
                        break;
                    }
                    countSpaces += 1;
                }
 
                /* Naively detect the start of a new block so we can
                 * continue to accept input. Our compiler isn't really
                 * set up to let us compile "on the fly" so we can't just
                 * run lines through it and see if it wants more... */
                if (lineLength > 1 && lines[i][lineLength-2] == ':') {
                    inBlock = 1;
                    blockWidth = countSpaces + 4;
                    continue;
                } else if (lineLength > 1 && lines[i][lineLength-2] == '\\') {
                    inBlock = 1;
                    continue;
                } else if (inBlock && lineLength != 1) {
                    if (isSpaces) {
                        free(lines[i]);
                        totalData -= lineLength;
                        lineCount--;
                        break;
                    }
                    blockWidth = countSpaces;
                    continue;
                } else if (lineLength > 1 && lines[i][countSpaces] == '@') {
                    inBlock = 1;
                    blockWidth = countSpaces;
                    continue;
                }
 
                /* Ignore blank lines. */
                if (isSpaces && !i) valid = 0;
 
                /* If we're not in a block, or have entered a blank line,
                 * we can stop reading new lines and jump to execution. */
                break;
            }
 
            if (valid) {
                allData = malloc(totalData + 1);
                allData[0] = '\0';
            }
 
            for (size_t i = 0; i < lineCount; ++i) {
                if (valid) strcat(allData, lines[i]);
#ifndef NO_RLINE
                if (enableRline) {
                    rline_history_insert(strdup(lines[i]));
                    rline_scroll = 0;
                }
#endif
                free(lines[i]);
            }
            KRK_FREE_ARRAY(char *, lines, lineCapacity);
 
            if (valid) {
                KrkValue result = krk_interpret(allData, "<stdin>");
                if (!IS_NONE(result)) {
                    krk_attachNamedValue(&vm.builtins->fields, "_", result);
                    printResult(stdout, result);
                }
                krk_resetStack();
                free(allData);
            }
 
            (void)blockWidth;
        }
    }
 
    krk_freeVM();
 
    if (IS_INTEGER(result)) return AS_INTEGER(result);
 
    return 0;
}