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 */
39 jerry_value_t
jerryx_handler_print(const jerry_value_t func_obj_val,const jerry_value_t this_p,const jerry_value_t args_p[],const jerry_length_t args_cnt)40 jerryx_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