1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef CRAS_EXPR_H_
#define CRAS_EXPR_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "array.h"
#include "dumper.h"
/* Value */
enum cras_expr_value_type {
CRAS_EXPR_VALUE_TYPE_NONE,
CRAS_EXPR_VALUE_TYPE_BOOLEAN,
CRAS_EXPR_VALUE_TYPE_INT,
CRAS_EXPR_VALUE_TYPE_STRING,
CRAS_EXPR_VALUE_TYPE_FUNCTION,
};
DECLARE_ARRAY_TYPE(struct cras_expr_value, cras_expr_value_array);
typedef void (*cras_expr_function_type)(cras_expr_value_array *operands,
struct cras_expr_value *result);
struct cras_expr_value {
enum cras_expr_value_type type;
union {
char boolean;
int integer;
const char *string;
cras_expr_function_type function;
} u;
};
/* initial value for the value type is zero */
// clang-format off
#define CRAS_EXPR_VALUE_INIT {}
// clang-format on
/* Expression */
enum expr_type {
EXPR_TYPE_NONE,
EXPR_TYPE_LITERAL,
EXPR_TYPE_VARIABLE,
EXPR_TYPE_COMPOUND,
};
DECLARE_ARRAY_TYPE(struct cras_expr_expression *, expr_array);
struct cras_expr_expression {
enum expr_type type;
union {
struct cras_expr_value literal;
const char *variable;
expr_array children;
} u;
};
/* Environment */
DECLARE_ARRAY_TYPE(const char *, string_array);
struct cras_expr_env {
string_array keys;
cras_expr_value_array values;
};
/* initial value for the environment type is zero */
// clang-format off
#define CRAS_EXPR_ENV_INIT {}
// clang-format on
void cras_expr_env_install_builtins(struct cras_expr_env *env);
void cras_expr_env_set_variable_boolean(struct cras_expr_env *env,
const char *name, char boolean);
void cras_expr_env_set_variable_integer(struct cras_expr_env *env,
const char *name, int integer);
void cras_expr_env_set_variable_string(struct cras_expr_env *env,
const char *name, const char *str);
void cras_expr_env_free(struct cras_expr_env *env);
void cras_expr_env_dump(struct dumper *d, const struct cras_expr_env *env);
struct cras_expr_expression *cras_expr_expression_parse(const char *str);
void cras_expr_expression_eval(struct cras_expr_expression *expr,
struct cras_expr_env *env,
struct cras_expr_value *value);
int cras_expr_expression_eval_boolean(struct cras_expr_expression *expr,
struct cras_expr_env *env, char *boolean);
int cras_expr_expression_eval_int(struct cras_expr_expression *expr,
struct cras_expr_env *env, int *integer);
void cras_expr_expression_free(struct cras_expr_expression *expr);
void cras_expr_expression_dump(struct dumper *d,
const struct cras_expr_expression *expr);
void cras_expr_value_free(struct cras_expr_value *value);
void cras_expr_value_dump(struct dumper *d,
const struct cras_expr_value *value);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* CRAS_EXPR_H_ */
|
