janet/src/core/run.c

/*
* Copyright (c) 2026 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/

#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include "state.h"
#endif

/* Run a string of code. The return value is a set of error flags, JANET_DO_ERROR_RUNTIME, JANET_DO_ERROR_COMPILE, and JANET_DOR_ERROR_PARSE if
 * any errors were encountered in those phases. More information is printed to stderr. */
int janet_dobytes(JanetTable *env, const uint8_t *bytes, int32_t len, const char *sourcePath, Janet *out) {
    JanetParser *parser;
    int errflags = 0, done = 0;
    int32_t index = 0;
    Janet ret = janet_wrap_nil();
    JanetFiber *fiber = NULL;
    const uint8_t *where = sourcePath ? janet_cstring(sourcePath) : NULL;

    if (where) janet_gcroot(janet_wrap_string(where));
    if (NULL == sourcePath) sourcePath = "<unknown>";
    parser = janet_abstract(&janet_parser_type, sizeof(JanetParser));
    janet_parser_init(parser);
    janet_gcroot(janet_wrap_abstract(parser));

    /* While we haven't seen an error */
    while (!done) {

        /* Evaluate parsed values */
        while (janet_parser_has_more(parser)) {
            Janet form = janet_parser_produce(parser);
            JanetCompileResult cres = janet_compile(form, env, where);
            if (cres.status == JANET_COMPILE_OK) {
                JanetFunction *f = janet_thunk(cres.funcdef);
                fiber = janet_fiber(f, 64, 0, NULL);
                fiber->env = env;
                JanetSignal status = janet_continue(fiber, janet_wrap_nil(), &ret);
                if (status != JANET_SIGNAL_OK && status != JANET_SIGNAL_EVENT) {
                    janet_stacktrace_ext(fiber, ret, "");
                    errflags |= JANET_DO_ERROR_RUNTIME;
                    done = 1;
                }
            } else {
                int32_t line = (int32_t) parser->line;
                int32_t col = (int32_t) parser->column;
                if ((cres.error_mapping.line > 0) &&
                        (cres.error_mapping.column > 0)) {
                    line = cres.error_mapping.line;
                    col = cres.error_mapping.column;
                }
                JanetString ctx = janet_formatc("%s:%d:%d: compile error",
                                                sourcePath, line, col);
                JanetString errstr = janet_formatc("%s: %s",
                                                   (const char *)ctx,
                                                   (const char *)cres.error);
                ret = janet_wrap_string(errstr);
                if (cres.macrofiber) {
                    janet_eprintf("%s", (const char *)ctx);
                    janet_stacktrace_ext(cres.macrofiber, ret, "");
                } else {
                    janet_eprintf("%s\n", (const char *)errstr);
                }
                errflags |= JANET_DO_ERROR_COMPILE;
                done = 1;
            }
        }

        if (done) break;

        /* Dispatch based on parse state */
        switch (janet_parser_status(parser)) {
            case JANET_PARSE_DEAD:
                done = 1;
                break;
            case JANET_PARSE_ERROR: {
                errflags |= JANET_DO_ERROR_PARSE;
                int32_t line = (int32_t) parser->line;
                int32_t col = (int32_t) parser->column;
                JanetString errstr = janet_formatc("%s:%d:%d: parse error: %s",
                                                   sourcePath, line, col,
                                                   janet_parser_error(parser));
                ret = janet_wrap_string(errstr);
                janet_eprintf("%s\n", (const char *)errstr);
                done = 1;
                break;
            }
            case JANET_PARSE_ROOT:
            case JANET_PARSE_PENDING:
                if (index >= len) {
                    janet_parser_eof(parser);
                } else {
                    janet_parser_consume(parser, bytes[index++]);
                }
                break;
        }

    }

    /* Clean up and return errors */
    janet_gcunroot(janet_wrap_abstract(parser));
    if (where) janet_gcunroot(janet_wrap_string(where));
#ifdef JANET_EV
    /* Enter the event loop if we are not already in it */
    if (janet_vm.stackn == 0) {
        if (fiber) {
            janet_gcroot(janet_wrap_fiber(fiber));
        }
        janet_loop();
        if (fiber) {
            janet_gcunroot(janet_wrap_fiber(fiber));
            if (!errflags)
                ret = fiber->last_value;
        }
    }
#endif
    if (out) *out = ret;
    return errflags;
}

int janet_dostring(JanetTable *env, const char *str, const char *sourcePath, Janet *out) {
    int32_t len = 0;
    while (str[len]) ++len;
    return janet_dobytes(env, (const uint8_t *)str, len, sourcePath, out);
}

/* Run a fiber to completion (use event loop if enabled). Return the status. */
int janet_loop_fiber(JanetFiber *fiber) {
    int status;
#ifdef JANET_EV
    janet_schedule(fiber, janet_wrap_nil());
    janet_loop();
    status = janet_fiber_status(fiber);
#else
    Janet out;
    status = janet_continue(fiber, janet_wrap_nil(), &out);
    if (status != JANET_SIGNAL_OK && status != JANET_SIGNAL_EVENT) {
        janet_stacktrace_ext(fiber, out, "");
    }
#endif
    return status;
}