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
|
#ifndef AST_ACCESSORS_H
#define AST_ACCESSORS_H
#include <stddef.h>
#include "ast/ast.h"
/**
* @brief Returns the i-th child of `ast`.
* The children are stored as follows:
* `index` 0: left child, or expression in unary trees, or `condition` in `if`
* blocks. `index` 1: right child, or `then` expression in `if` blocks. `index`
* 2+: middle children, or `else` expression in `if` blocks (only `index` 2).
* @param ast Any kind of AST.
* @param index The index of the child to get.
* @note All kinds of ASTs can be passed to this function.
* All `index` can be passed to this function too.
* However, if the given type does not have any child or if the `index` is too
* big, `get_i` returns `NULL.`
*/
struct ast *get_i(struct ast *ast, size_t index);
/**
* @brief Alias for `get_i(ast, 0)`.
* @note See `get_i` for a full explanation.
*/
struct ast *get_left(struct ast *ast);
/**
* @brief Alias for `get_i(ast, 1)`.
* @note See `get_i` for a full explanation.
*/
struct ast *get_right(struct ast *ast);
/**
* @brief Sets the `child` as the i-th child of `ast`.
* The children are stored as follows:
* `index` 0: left child, or expression in unary trees, or `condition` in `if`
* blocks. `index` 1: right child, or `then` expression in `if` blocks. `index`
* 2+: middle children, or `else` expression in `if` blocks (only `index` 2).
* @param ast Any kind of AST.
* @param child The child to be assigned in `ast`.
* @param index The position of the child in the `ast`.
* @note All kinds of ASTs can be passed to this function.
* All `index` can be passed to this function too.
* However, if the given type can not contain any child or if the `index` is too
* big, `set_i` does nothing.
*/
void set_i(struct ast *ast, struct ast *child, size_t index);
/**
* @brief Alias for `set_i(ast, child, 0)`.
* @note See `set_i` for a full explanation.
*/
void set_left(struct ast *ast, struct ast *child);
/**
* @brief Alias for `set_i(ast, child, 1)`.
* @note See `set_i` for a full explanation.
*/
void set_right(struct ast *ast, struct ast *child);
#endif /* ! AST_ACCESSORS_H */
|
