/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * 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.
 */

#include <stdint.h>

#include "py/objfun.h"
#include "py/compile.h"
#include "py/runtime.h"
#include "py/builtin.h"

#if MICROPY_PY_BUILTINS_COMPILE

typedef struct _mp_obj_code_t {
 mp_obj_base_t base;
 mp_obj_t module_fun;
} mp_obj_code_t;

STATIC const mp_obj_type_t mp_type_code = {
 { &mp_type_type },
 .name = MP_QSTR_code,
};

STATIC mp_obj_t code_execute(mp_obj_code_t *self, mp_obj_dict_t *globals, mp_obj_dict_t *locals) {
 // save context and set new context
 mp_obj_dict_t *old_globals = mp_globals_get();
 mp_obj_dict_t *old_locals = mp_locals_get();
 mp_globals_set(globals);
 mp_locals_set(locals);

 // a bit of a hack: fun_bc will re-set globals, so need to make sure it's
 // the correct one
 if (mp_obj_is_type(self->module_fun, &mp_type_fun_bc)) {
 mp_obj_fun_bc_t *fun_bc = MP_OBJ_TO_PTR(self->module_fun);
 fun_bc->globals = globals;
 }

 // execute code
 nlr_buf_t nlr;
 if (nlr_push(&nlr) == 0) {
 mp_obj_t ret = mp_call_function_0(self->module_fun);
 nlr_pop();
 mp_globals_set(old_globals);
 mp_locals_set(old_locals);
 return ret;
 } else {
 // exception; restore context and re-raise same exception
 mp_globals_set(old_globals);
 mp_locals_set(old_locals);
 nlr_jump(nlr.ret_val);
 }
}

STATIC mp_obj_t mp_builtin_compile(size_t n_args, const mp_obj_t *args) {
 (void)n_args;

 // get the source
 size_t str_len;
 const char *str = mp_obj_str_get_data(args[0], &str_len);

 // get the filename
 qstr filename = mp_obj_str_get_qstr(args[1]);

 // create the lexer
 mp_lexer_t *lex = mp_lexer_new_from_str_len(filename, str, str_len, 0);

 // get the compile mode
 qstr mode = mp_obj_str_get_qstr(args[2]);
 mp_parse_input_kind_t parse_input_kind;
 switch (mode) {
 case MP_QSTR_single:
 parse_input_kind = MP_PARSE_SINGLE_INPUT;
 break;
 case MP_QSTR_exec:
 parse_input_kind = MP_PARSE_FILE_INPUT;
 break;
 case MP_QSTR_eval:
 parse_input_kind = MP_PARSE_EVAL_INPUT;
 break;
 default:
 mp_raise_ValueError(MP_ERROR_TEXT("bad compile mode"));
 }

 mp_obj_code_t *code = m_new_obj(mp_obj_code_t);
 code->base.type = &mp_type_code;
 code->module_fun = mp_parse_compile_execute(lex, parse_input_kind, NULL, NULL);
 return MP_OBJ_FROM_PTR(code);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_compile_obj, 3, 6, mp_builtin_compile);

#endif // MICROPY_PY_BUILTINS_COMPILE

#if MICROPY_PY_BUILTINS_EVAL_EXEC

STATIC mp_obj_t eval_exec_helper(size_t n_args, const mp_obj_t *args, mp_parse_input_kind_t parse_input_kind) {
 // work out the context
 mp_obj_dict_t *globals = mp_globals_get();
 mp_obj_dict_t *locals = mp_locals_get();
 for (size_t i = 1; i < 3 && i < n_args; ++i) {
 if (args[i] != mp_const_none) {
 if (!mp_obj_is_type(args[i], &mp_type_dict)) {
 mp_raise_TypeError(NULL);
 }
 locals = MP_OBJ_TO_PTR(args[i]);
 if (i == 1) {
 globals = locals;
 }
 }
 }

 #if MICROPY_PY_BUILTINS_COMPILE
 if (mp_obj_is_type(args[0], &mp_type_code)) {
 return code_execute(MP_OBJ_TO_PTR(args[0]), globals, locals);
 }
 #endif

 // Extract the source code.
 mp_buffer_info_t bufinfo;
 mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);

 // create the lexer
 // MP_PARSE_SINGLE_INPUT is used to indicate a file input
 mp_lexer_t *lex;
 if (MICROPY_PY_BUILTINS_EXECFILE && parse_input_kind == MP_PARSE_SINGLE_INPUT) {
 lex = mp_lexer_new_from_file(bufinfo.buf);
 parse_input_kind = MP_PARSE_FILE_INPUT;
 } else {
 lex = mp_lexer_new_from_str_len(MP_QSTR__lt_string_gt_, bufinfo.buf, bufinfo.len, 0);
 }

 return mp_parse_compile_execute(lex, parse_input_kind, globals, locals);
}

STATIC mp_obj_t mp_builtin_eval(size_t n_args, const mp_obj_t *args) {
 return eval_exec_helper(n_args, args, MP_PARSE_EVAL_INPUT);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_eval_obj, 1, 3, mp_builtin_eval);

STATIC mp_obj_t mp_builtin_exec(size_t n_args, const mp_obj_t *args) {
 return eval_exec_helper(n_args, args, MP_PARSE_FILE_INPUT);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_exec_obj, 1, 3, mp_builtin_exec);

#endif // MICROPY_PY_BUILTINS_EVAL_EXEC

#if MICROPY_PY_BUILTINS_EXECFILE
STATIC mp_obj_t mp_builtin_execfile(size_t n_args, const mp_obj_t *args) {
 // MP_PARSE_SINGLE_INPUT is used to indicate a file input
 return eval_exec_helper(n_args, args, MP_PARSE_SINGLE_INPUT);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_execfile_obj, 1, 3, mp_builtin_execfile);
#endif