1/* Copyright JS Foundation and other contributors, http://js.foundation
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "jerryscript-ext/handler.h"
17#include "jerryscript-port.h"
18#include "jerryscript-debugger.h"
19
20/**
21 * Provide a 'print' implementation for scripts.
22 *
23 * The routine converts all of its arguments to strings and outputs them
24 * char-by-char using jerry_port_print_char.
25 *
26 * The NUL character is output as "\u0000", other characters are output
27 * bytewise.
28 *
29 * Note:
30 *      This implementation does not use standard C `printf` to print its
31 *      output. This allows more flexibility but also extends the core
32 *      JerryScript engine port API. Applications that want to use
33 *      `jerryx_handler_print` must ensure that their port implementation also
34 *      provides `jerry_port_print_char`.
35 *
36 * @return undefined - if all arguments could be converted to strings,
37 *         error - otherwise.
38 */
39jerry_value_t
40jerryx_handler_print (const jerry_value_t func_obj_val, /**< function object */
41                      const jerry_value_t this_p, /**< this arg */
42                      const jerry_value_t args_p[], /**< function arguments */
43                      const jerry_length_t args_cnt) /**< number of function arguments */
44{
45  (void) func_obj_val; /* unused */
46  (void) this_p; /* unused */
47
48  const char * const null_str = "\\u0000";
49
50  jerry_value_t ret_val = jerry_create_undefined ();
51
52  for (jerry_length_t arg_index = 0; arg_index < args_cnt; arg_index++)
53  {
54    jerry_value_t str_val;
55
56    if (jerry_value_is_symbol (args_p[arg_index]))
57    {
58      str_val = jerry_get_symbol_descriptive_string (args_p[arg_index]);
59    }
60    else
61    {
62      str_val = jerry_value_to_string (args_p[arg_index]);
63    }
64
65    if (jerry_value_is_error (str_val))
66    {
67      /* There is no need to free the undefined value. */
68      ret_val = str_val;
69      break;
70    }
71
72    jerry_length_t length = jerry_get_utf8_string_length (str_val);
73    jerry_length_t substr_pos = 0;
74    jerry_char_t substr_buf[256];
75
76    do
77    {
78      jerry_size_t substr_size = jerry_substring_to_utf8_char_buffer (str_val,
79                                                                      substr_pos,
80                                                                      length,
81                                                                      substr_buf,
82                                                                      256 - 1);
83
84      jerry_char_t *buf_end_p = substr_buf + substr_size;
85
86      /* Update start position by the number of utf-8 characters. */
87      for (jerry_char_t *buf_p = substr_buf; buf_p < buf_end_p; buf_p++)
88      {
89        /* Skip intermediate utf-8 octets. */
90        if ((*buf_p & 0xc0) != 0x80)
91        {
92          substr_pos++;
93        }
94      }
95
96      if (substr_pos == length)
97      {
98        *buf_end_p++ = (arg_index < args_cnt - 1) ? ' ' : '\n';
99      }
100
101      for (jerry_char_t *buf_p = substr_buf; buf_p < buf_end_p; buf_p++)
102      {
103        char chr = (char) *buf_p;
104
105        if (chr != '\0')
106        {
107          jerry_port_print_char (chr);
108          continue;
109        }
110
111        for (jerry_size_t null_index = 0; null_str[null_index] != '\0'; null_index++)
112        {
113          jerry_port_print_char (null_str[null_index]);
114        }
115      }
116    }
117    while (substr_pos < length);
118
119    jerry_release_value (str_val);
120  }
121
122  if (args_cnt == 0 || jerry_value_is_error (ret_val))
123  {
124    jerry_port_print_char ('\n');
125  }
126
127  return ret_val;
128} /* jerryx_handler_print */
129