2 * Copyright (c) 2016, Olivier MATZ <zer0@droids-corp.org>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
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29 * Interface to manage the ecoli nodes.
31 * A node is a main structure of the ecoli library, used to define how
32 * to match and complete the input tokens. A node is a generic object
34 * - a parse(node, input) method: check if an input matches
35 * - a complete(node, input) method: return possible completions for
37 * - some other methods to initialize, free, ...
39 * One basic example is the string node (ec_node_str). A node
40 * ec_node_str("foo") will match any token list starting with "foo",
43 * - ["foo", "bar", ...]
48 * A node ec_node_str("foo") will complete with "foo" if the input
49 * contains one token, with the same beginning than "foo":
54 * But it will not complete:
60 * A node can have child nodes. For instance, a sequence node
61 * ec_node_seq(ec_node_str("foo"), ec_node_str("bar")) will match
68 #include <sys/queue.h>
69 #include <sys/types.h>
72 #define EC_NO_ID "no-id"
74 #define EC_NODE_ENDLIST ((void *)1)
82 #define EC_NODE_TYPE_REGISTER(t) \
83 static void ec_node_init_##t(void); \
84 static void __attribute__((constructor, used)) \
85 ec_node_init_##t(void) \
87 if (ec_node_type_register(&t) < 0) \
88 fprintf(stderr, "cannot register %s\n", t.name); \
91 TAILQ_HEAD(ec_node_type_list, ec_node_type);
93 /* return 0 on success, else -errno. */
94 typedef int (*ec_node_build_t)(struct ec_node *node);
96 typedef int (*ec_node_parse_t)(const struct ec_node *node,
97 struct ec_parsed *state,
98 const struct ec_strvec *strvec);
99 typedef int (*ec_node_complete_t)(const struct ec_node *node,
100 struct ec_completed *completed_state,
101 const struct ec_strvec *strvec);
102 typedef const char * (*ec_node_desc_t)(const struct ec_node *);
103 typedef int (*ec_node_init_priv_t)(struct ec_node *);
104 typedef void (*ec_node_free_priv_t)(struct ec_node *);
107 * A structure describing a node type.
109 struct ec_node_type {
110 TAILQ_ENTRY(ec_node_type) next; /**< Next in list. */
111 const char *name; /**< Node type name. */
112 ec_node_build_t build; /**< (Re)build the node */
113 ec_node_parse_t parse;
114 ec_node_complete_t complete;
117 ec_node_init_priv_t init_priv;
118 ec_node_free_priv_t free_priv;
122 * Register a node type.
125 * A pointer to a ec_test structure describing the test
128 * 0 on success, negative value on error.
130 int ec_node_type_register(struct ec_node_type *type);
133 * Lookup node type by name
136 * The name of the node type to search.
138 * The node type if found, or NULL on error.
140 struct ec_node_type *ec_node_type_lookup(const char *name);
143 * Dump registered log types
145 void ec_node_type_dump(FILE *out);
148 const struct ec_node_type *type;
151 struct ec_keyval *attrs;
153 struct ec_node **children; /* array of children */
154 size_t n_children; /* number of children in the array */
157 /* create a new node when the type is known, typically called from the node
159 struct ec_node *__ec_node(const struct ec_node_type *type, const char *id);
161 /* create a_new node node */
162 struct ec_node *ec_node(const char *typename, const char *id);
164 struct ec_node *ec_node_clone(struct ec_node *node);
165 void ec_node_free(struct ec_node *node);
167 size_t ec_node_get_children_count(const struct ec_node *node);
169 ec_node_get_child(const struct ec_node *node, size_t i);
170 int ec_node_add_child(struct ec_node *node, struct ec_node *child);
171 int ec_node_del_child(struct ec_node *node, struct ec_node *child);
173 /* XXX add more accessors */
174 struct ec_keyval *ec_node_attrs(const struct ec_node *node);
175 const char *ec_node_id(const struct ec_node *node);
176 const char *ec_node_desc(const struct ec_node *node);
178 void ec_node_dump(FILE *out, const struct ec_node *node);
179 struct ec_node *ec_node_find(struct ec_node *node, const char *id);
181 /* check the type of a node */
182 int ec_node_check_type(const struct ec_node *node,
183 const struct ec_node_type *type);