308 lines
11 KiB
C
308 lines
11 KiB
C
// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
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// SPDX-FileCopyrightText: Copyright (c) 2014-2016 Damien P. George
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//
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// SPDX-License-Identifier: MIT
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#include <stdio.h>
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#include "py/objlist.h"
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#include "py/objstringio.h"
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#include "py/parsenum.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "supervisor/shared/translate.h"
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#if MICROPY_PY_UJSON
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STATIC mp_obj_t mod_ujson_dump(mp_obj_t obj, mp_obj_t stream) {
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mp_get_stream_raise(stream, MP_STREAM_OP_WRITE);
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mp_print_t print = {MP_OBJ_TO_PTR(stream), mp_stream_write_adaptor};
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mp_obj_print_helper(&print, obj, PRINT_JSON);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_ujson_dump_obj, mod_ujson_dump);
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STATIC mp_obj_t mod_ujson_dumps(mp_obj_t obj) {
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vstr_t vstr;
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mp_print_t print;
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vstr_init_print(&vstr, 8, &print);
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mp_obj_print_helper(&print, obj, PRINT_JSON);
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return mp_obj_new_str_from_vstr(&mp_type_str, &vstr);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_ujson_dumps_obj, mod_ujson_dumps);
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#define JSON_DEBUG(...) (void)0
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// #define JSON_DEBUG(...) mp_printf(&mp_plat_print __VA_OPT__(,) __VA_ARGS__)
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// The function below implements a simple non-recursive JSON parser.
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//
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// The JSON specification is at http://www.ietf.org/rfc/rfc4627.txt
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// The parser here will parse any valid JSON and return the correct
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// corresponding Python object. It allows through a superset of JSON, since
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// it treats commas and colons as "whitespace", and doesn't care if
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// brackets/braces are correctly paired. It will raise a ValueError if the
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// input is outside it's specs.
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//
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// Most of the work is parsing the primitives (null, false, true, numbers,
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// strings). It does 1 pass over the input stream. It tries to be fast and
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// small in code size, while not using more RAM than necessary.
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typedef struct _ujson_stream_t {
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mp_obj_t stream_obj;
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mp_uint_t (*read)(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode);
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int errcode;
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byte cur;
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} ujson_stream_t;
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#define S_EOF (0) // null is not allowed in json stream so is ok as EOF marker
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#define S_END(s) ((s).cur == S_EOF)
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#define S_CUR(s) ((s).cur)
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#define S_NEXT(s) (ujson_stream_next(&(s)))
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STATIC byte ujson_stream_next(ujson_stream_t *s) {
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mp_uint_t ret = s->read(s->stream_obj, &s->cur, 1, &s->errcode);
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JSON_DEBUG(" usjon_stream_next err:%2d cur: %c \n", s->errcode, s->cur);
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if (s->errcode != 0) {
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mp_raise_OSError(s->errcode);
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}
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if (ret == 0) {
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s->cur = S_EOF;
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}
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return s->cur;
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}
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STATIC mp_obj_t _mod_ujson_load(mp_obj_t stream_obj, bool return_first_json) {
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const mp_stream_p_t *stream_p = mp_get_stream_raise(stream_obj, MP_STREAM_OP_READ);
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ujson_stream_t s = {stream_obj, stream_p->read, 0, 0};
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JSON_DEBUG("got JSON stream\n");
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vstr_t vstr;
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vstr_init(&vstr, 8);
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mp_obj_list_t stack; // we use a list as a simple stack for nested JSON
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stack.len = 0;
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stack.items = NULL;
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mp_obj_t stack_top = MP_OBJ_NULL;
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mp_obj_type_t *stack_top_type = NULL;
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mp_obj_t stack_key = MP_OBJ_NULL;
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S_NEXT(s);
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for (;;) {
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cont:
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if (S_END(s)) {
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break;
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}
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mp_obj_t next = MP_OBJ_NULL;
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bool enter = false;
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byte cur = S_CUR(s);
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S_NEXT(s);
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switch (cur) {
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case ',':
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case ':':
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case ' ':
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case '\t':
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case '\n':
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case '\r':
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goto cont;
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case 'n':
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if (S_CUR(s) == 'u' && S_NEXT(s) == 'l' && S_NEXT(s) == 'l') {
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S_NEXT(s);
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next = mp_const_none;
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} else {
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goto fail;
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}
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break;
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case 'f':
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if (S_CUR(s) == 'a' && S_NEXT(s) == 'l' && S_NEXT(s) == 's' && S_NEXT(s) == 'e') {
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S_NEXT(s);
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next = mp_const_false;
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} else {
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goto fail;
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}
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break;
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case 't':
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if (S_CUR(s) == 'r' && S_NEXT(s) == 'u' && S_NEXT(s) == 'e') {
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S_NEXT(s);
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next = mp_const_true;
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} else {
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goto fail;
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}
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break;
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case '"':
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vstr_reset(&vstr);
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for (; !S_END(s) && S_CUR(s) != '"';) {
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byte c = S_CUR(s);
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if (c == '\\') {
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c = S_NEXT(s);
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switch (c) {
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case 'b': c = 0x08; break;
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case 'f': c = 0x0c; break;
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case 'n': c = 0x0a; break;
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case 'r': c = 0x0d; break;
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case 't': c = 0x09; break;
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case 'u': {
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mp_uint_t num = 0;
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for (int i = 0; i < 4; i++) {
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c = (S_NEXT(s) | 0x20) - '0';
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if (c > 9) {
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c -= ('a' - ('9' + 1));
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}
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num = (num << 4) | c;
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}
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vstr_add_char(&vstr, num);
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goto str_cont;
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}
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}
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}
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vstr_add_byte(&vstr, c);
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str_cont:
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S_NEXT(s);
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}
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if (S_END(s)) {
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goto fail;
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}
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S_NEXT(s);
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next = mp_obj_new_str(vstr.buf, vstr.len);
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break;
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case '-':
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case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': {
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bool flt = false;
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vstr_reset(&vstr);
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for (;;) {
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vstr_add_byte(&vstr, cur);
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cur = S_CUR(s);
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if (cur == '.' || cur == 'E' || cur == 'e') {
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flt = true;
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} else if (cur == '-' || unichar_isdigit(cur)) {
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// pass
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} else {
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break;
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}
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S_NEXT(s);
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}
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if (flt) {
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next = mp_parse_num_decimal(vstr.buf, vstr.len, false, false, NULL);
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} else {
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next = mp_parse_num_integer(vstr.buf, vstr.len, 10, NULL);
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}
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break;
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}
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case '[':
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next = mp_obj_new_list(0, NULL);
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enter = true;
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break;
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case '{':
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next = mp_obj_new_dict(0);
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enter = true;
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break;
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case '}':
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case ']': {
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if (stack_top == MP_OBJ_NULL) {
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// no object at all
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goto fail;
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}
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if (stack.len == 0) {
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// finished; compound object
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goto success;
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}
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stack.len -= 1;
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stack_top = stack.items[stack.len];
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stack_top_type = mp_obj_get_type(stack_top);
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goto cont;
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}
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default:
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goto fail;
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}
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if (stack_top == MP_OBJ_NULL) {
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stack_top = next;
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stack_top_type = mp_obj_get_type(stack_top);
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if (!enter) {
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// finished; single primitive only
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goto success;
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}
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} else {
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// append to list or dict
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if (stack_top_type == &mp_type_list) {
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mp_obj_list_append(stack_top, next);
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} else {
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if (stack_key == MP_OBJ_NULL) {
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stack_key = next;
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if (enter) {
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goto fail;
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}
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} else {
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mp_obj_dict_store(stack_top, stack_key, next);
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stack_key = MP_OBJ_NULL;
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}
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}
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if (enter) {
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if (stack.items == NULL) {
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mp_obj_list_init(&stack, 1);
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stack.items[0] = stack_top;
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} else {
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mp_obj_list_append(MP_OBJ_FROM_PTR(&stack), stack_top);
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}
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stack_top = next;
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stack_top_type = mp_obj_get_type(stack_top);
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}
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}
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}
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success:
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// It is legal for a stream to have contents after JSON.
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// E.g., A UART is not closed after receiving an object; in load() we will
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// return the first complete JSON object, while in loads() we will retain
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// strict adherence to the buffer's complete semantic.
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if (!return_first_json) {
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while (unichar_isspace(S_CUR(s))) {
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S_NEXT(s);
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}
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if (!S_END(s)) {
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// unexpected chars
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goto fail;
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}
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}
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if (stack_top == MP_OBJ_NULL || stack.len != 0) {
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// not exactly 1 object
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goto fail;
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}
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vstr_clear(&vstr);
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return stack_top;
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fail:
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mp_raise_ValueError(translate("syntax error in JSON"));
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}
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STATIC mp_obj_t mod_ujson_load(mp_obj_t stream_obj) {
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return _mod_ujson_load(stream_obj, true);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_ujson_load_obj, mod_ujson_load);
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STATIC mp_obj_t mod_ujson_loads(mp_obj_t obj) {
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size_t len;
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const char *buf = mp_obj_str_get_data(obj, &len);
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vstr_t vstr = {len, len, (char*)buf, true};
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mp_obj_stringio_t sio = {{&mp_type_stringio}, &vstr, 0, MP_OBJ_NULL};
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return _mod_ujson_load(MP_OBJ_FROM_PTR(&sio), false);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_ujson_loads_obj, mod_ujson_loads);
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STATIC const mp_rom_map_elem_t mp_module_ujson_globals_table[] = {
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#if CIRCUITPY
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_json) },
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#else
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_ujson) },
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#endif
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{ MP_ROM_QSTR(MP_QSTR_dump), MP_ROM_PTR(&mod_ujson_dump_obj) },
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{ MP_ROM_QSTR(MP_QSTR_dumps), MP_ROM_PTR(&mod_ujson_dumps_obj) },
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{ MP_ROM_QSTR(MP_QSTR_load), MP_ROM_PTR(&mod_ujson_load_obj) },
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{ MP_ROM_QSTR(MP_QSTR_loads), MP_ROM_PTR(&mod_ujson_loads_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mp_module_ujson_globals, mp_module_ujson_globals_table);
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const mp_obj_module_t mp_module_ujson = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mp_module_ujson_globals,
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};
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#endif //MICROPY_PY_UJSON
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