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objfun.c

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  • builtinimport.c 6.32 KiB
    #include <stdint.h>
    #include <stdlib.h>
    #include <stdio.h>
    #include <stdarg.h>
    #include <string.h>
    #include <assert.h>
    
    #include "nlr.h"
    #include "misc.h"
    #include "mpconfig.h"
    #include "qstr.h"
    #include "lexer.h"
    #include "lexerunix.h"
    #include "parse.h"
    #include "obj.h"
    #include "compile.h"
    #include "runtime0.h"
    #include "runtime.h"
    #include "map.h"
    #include "builtin.h"
    
    #define PATH_SEP_CHAR '/'
    
    mp_obj_t sys_path;
    
    mp_import_stat_t stat_dir_or_file(vstr_t *path) {
        //printf("stat %s\n", vstr_str(path));
        mp_import_stat_t stat = mp_import_stat(vstr_str(path));
        if (stat == MP_IMPORT_STAT_DIR) {
            return stat;
        }
        vstr_add_str(path, ".py");
        stat = mp_import_stat(vstr_str(path));
        if (stat == MP_IMPORT_STAT_FILE) {
            return stat;
        }
        return MP_IMPORT_STAT_NO_EXIST;
    }
    
    mp_import_stat_t find_file(const char *file_str, uint file_len, vstr_t *dest) {
        // extract the list of paths
        uint path_num = 0;
        mp_obj_t *path_items;
        if (sys_path != MP_OBJ_NULL) {
            mp_obj_list_get(sys_path, &path_num, &path_items);
        }
    
        if (path_num == 0) {
            // sys_path is empty, so just use the given file name
            vstr_add_strn(dest, file_str, file_len);
            return stat_dir_or_file(dest);
        } else {
            // go through each path looking for a directory or file
            for (int i = 0; i < path_num; i++) {
                vstr_reset(dest);
                uint p_len;
                const char *p = mp_obj_str_get_data(path_items[i], &p_len);
                if (p_len > 0) {
                    vstr_add_strn(dest, p, p_len);
                    vstr_add_char(dest, PATH_SEP_CHAR);
                }
                vstr_add_strn(dest, file_str, file_len);
                mp_import_stat_t stat = stat_dir_or_file(dest);
                if (stat != MP_IMPORT_STAT_NO_EXIST) {
                    return stat;
                }
            }
    
            // could not find a directory or file
            return MP_IMPORT_STAT_NO_EXIST;
        }
    }
    
    void do_load(mp_obj_t module_obj, vstr_t *file) {
        // create the lexer
        mp_lexer_t *lex = mp_lexer_new_from_file(vstr_str(file));
    
        if (lex == NULL) {
            // we verified the file exists using stat, but lexer could still fail
            nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_ImportError, "ImportError: No module named '%s'", vstr_str(file)));
        }
    
        qstr source_name = mp_lexer_source_name(lex);
    
        // save the old context
        mp_map_t *old_locals = rt_locals_get();
        mp_map_t *old_globals = rt_globals_get();
    
        // set the new context
        rt_locals_set(mp_obj_module_get_globals(module_obj));
        rt_globals_set(mp_obj_module_get_globals(module_obj));
    
        // parse the imported script
        qstr parse_exc_id;
        const char *parse_exc_msg;
        mp_parse_node_t pn = mp_parse(lex, MP_PARSE_FILE_INPUT, &parse_exc_id, &parse_exc_msg);
        mp_lexer_free(lex);
    
        if (pn == MP_PARSE_NODE_NULL) {
            // parse error; clean up and raise exception
            rt_locals_set(old_locals);
            rt_globals_set(old_globals);
            nlr_jump(mp_obj_new_exception_msg(parse_exc_id, parse_exc_msg));
        }
    
        // compile the imported script
        mp_obj_t module_fun = mp_compile(pn, source_name, false);
        mp_parse_node_free(pn);
    
        if (module_fun == mp_const_none) {
            // TODO handle compile error correctly
            rt_locals_set(old_locals);
            rt_globals_set(old_globals);
            return;
        }
    
        // complied successfully, execute it
        nlr_buf_t nlr;
        if (nlr_push(&nlr) == 0) {
            rt_call_function_0(module_fun);
            nlr_pop();
        } else {
            // exception; restore context and re-raise same exception
            rt_locals_set(old_locals);
            rt_globals_set(old_globals);
            nlr_jump(nlr.ret_val);
        }
        rt_locals_set(old_locals);
        rt_globals_set(old_globals);
    }
    
    mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
        /*
        printf("import:\n");
        for (int i = 0; i < n; i++) {
            printf("  ");
            mp_obj_print(args[i]);
            printf("\n");
        }
        */
    
        // check if module already exists
        mp_obj_t module_obj = mp_obj_module_get(mp_obj_str_get_qstr(args[0]));
        if (module_obj != MP_OBJ_NULL) {
            return module_obj;
        }
    
        uint mod_len;
        const char *mod_str = (const char*)mp_obj_str_get_data(args[0], &mod_len);
    
        uint last = 0;
        VSTR_FIXED(path, MICROPY_PATH_MAX)
        module_obj = MP_OBJ_NULL;
        uint i;
        for (i = 1; i <= mod_len; i++) {
            if (i == mod_len || mod_str[i] == '.') {
                // create a qstr for the module name up to this depth
                qstr mod_name = qstr_from_strn(mod_str, i);
    
                // find the file corresponding to the module name
                mp_import_stat_t stat;
                if (vstr_len(&path) == 0) {
                    // first module in the dotted-name; search for a directory or file
                    stat = find_file(mod_str, i, &path);
                } else {
                    // latter module in the dotted-name; append to path
                    vstr_add_char(&path, PATH_SEP_CHAR);
                    vstr_add_strn(&path, mod_str + last, i - last);
                    stat = stat_dir_or_file(&path);
                }
                last = i + 1;
    
                // fail if we couldn't find the file
                if (stat == MP_IMPORT_STAT_NO_EXIST) {
                    nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_ImportError, "ImportError: No module named '%s'", qstr_str(mod_name)));
                }
    
                module_obj = mp_obj_module_get(mod_name);
                if (module_obj == MP_OBJ_NULL) {
                    // module not already loaded, so load it!
    
                    module_obj = mp_obj_new_module(mod_name);
    
                    if (stat == MP_IMPORT_STAT_DIR) {
                        vstr_add_char(&path, PATH_SEP_CHAR);
                        vstr_add_str(&path, "__init__.py");
                        if (mp_import_stat(vstr_str(&path)) == MP_IMPORT_STAT_FILE) {
                            do_load(module_obj, &path);
                        }
                        vstr_cut_tail(&path, 12); // cut off /__init__.py
                    } else { // MP_IMPORT_STAT_FILE
                        do_load(module_obj, &path);
                        break;
                    }
                }
            }
        }
    
        if (i < mod_len) {
            // we loaded a package, now need to load objects from within that package
            // TODO
            assert(0);
        }
    
        return module_obj;
    }
    
    MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin___import___obj, 1, 5, mp_builtin___import__);