1 /* Copyright (c) 2013-2015, Vsevolod Stakhov
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution.
12 * THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
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14 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
15 * DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
16 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
17 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
18 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
19 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
21 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 # define UCL_EXTERN __declspec(dllexport)
43 * This is a reference manual for UCL API. You may find the description of UCL format by following this
44 * [github repository](https://github.com/vstakhov/libucl).
46 * This manual has several main sections:
55 * @brief UCL parsing and emitting functions
57 * UCL is universal configuration language, which is a form of
58 * JSON with less strict rules that make it more comfortable for
59 * using as a configuration language
65 * Memory allocation utilities
66 * UCL_ALLOC(size) - allocate memory for UCL
67 * UCL_FREE(size, ptr) - free memory of specified size at ptr
68 * Default: malloc and free
71 #define UCL_ALLOC(size) malloc(size)
74 #define UCL_FREE(size, ptr) free(ptr)
77 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
78 #define UCL_WARN_UNUSED_RESULT \
79 __attribute__((warn_unused_result))
81 #define UCL_WARN_UNUSED_RESULT
85 #define UCL_DEPRECATED(func) func __attribute__ ((deprecated))
86 #elif defined(_MSC_VER)
87 #define UCL_DEPRECATED(func) __declspec(deprecated) func
89 #define UCL_DEPRECATED(func) func
93 * @defgroup structures Structures and types
94 * UCL defines several enumeration types used for error reporting or specifying flags and attributes.
100 * The common error codes returned by ucl parser
102 typedef enum ucl_error {
103 UCL_EOK = 0, /**< No error */
104 UCL_ESYNTAX, /**< Syntax error occurred during parsing */
105 UCL_EIO, /**< IO error occurred during parsing */
106 UCL_ESTATE, /**< Invalid state machine state */
107 UCL_ENESTED, /**< Input has too many recursion levels */
108 UCL_EMACRO, /**< Error processing a macro */
109 UCL_EINTERNAL, /**< Internal unclassified error */
110 UCL_ESSL /**< SSL error */
114 * #ucl_object_t may have one of specified types, some types are compatible with each other and some are not.
115 * For example, you can always convert #UCL_TIME to #UCL_FLOAT. Also you can convert #UCL_FLOAT to #UCL_INTEGER
116 * by loosing floating point. Every object may be converted to a string by #ucl_object_tostring_forced() function.
119 typedef enum ucl_type {
120 UCL_OBJECT = 0, /**< UCL object - key/value pairs */
121 UCL_ARRAY, /**< UCL array */
122 UCL_INT, /**< Integer number */
123 UCL_FLOAT, /**< Floating point number */
124 UCL_STRING, /**< Null terminated string */
125 UCL_BOOLEAN, /**< Boolean value */
126 UCL_TIME, /**< Time value (floating point number of seconds) */
127 UCL_USERDATA, /**< Opaque userdata pointer (may be used in macros) */
128 UCL_NULL /**< Null value */
132 * You can use one of these types to serialise #ucl_object_t by using ucl_object_emit().
134 typedef enum ucl_emitter {
135 UCL_EMIT_JSON = 0, /**< Emit fine formatted JSON */
136 UCL_EMIT_JSON_COMPACT, /**< Emit compacted JSON */
137 UCL_EMIT_CONFIG, /**< Emit human readable config format */
138 UCL_EMIT_YAML, /**< Emit embedded YAML format */
139 UCL_EMIT_MSGPACK, /**< Emit msgpack output */
140 UCL_EMIT_MAX /**< Unsupported emitter type */
144 * These flags defines parser behaviour. If you specify #UCL_PARSER_ZEROCOPY you must ensure
145 * that the input memory is not freed if an object is in use. Moreover, if you want to use
146 * zero-terminated keys and string values then you should not use zero-copy mode, as in this case
147 * UCL still has to perform copying implicitly.
149 typedef enum ucl_parser_flags {
150 UCL_PARSER_DEFAULT = 0x0, /**< No special flags */
151 UCL_PARSER_KEY_LOWERCASE = 0x1, /**< Convert all keys to lower case */
152 UCL_PARSER_ZEROCOPY = 0x2, /**< Parse input in zero-copy mode if possible */
153 UCL_PARSER_NO_TIME = 0x4, /**< Do not parse time and treat time values as strings */
154 UCL_PARSER_NO_IMPLICIT_ARRAYS = 0x8 /** Create explicit arrays instead of implicit ones */
155 } ucl_parser_flags_t;
158 * String conversion flags, that are used in #ucl_object_fromstring_common function.
160 typedef enum ucl_string_flags {
161 UCL_STRING_RAW = 0x0, /**< Treat string as is */
162 UCL_STRING_ESCAPE = 0x1, /**< Perform JSON escape */
163 UCL_STRING_TRIM = 0x2, /**< Trim leading and trailing whitespaces */
164 UCL_STRING_PARSE_BOOLEAN = 0x4, /**< Parse passed string and detect boolean */
165 UCL_STRING_PARSE_INT = 0x8, /**< Parse passed string and detect integer number */
166 UCL_STRING_PARSE_DOUBLE = 0x10, /**< Parse passed string and detect integer or float number */
167 UCL_STRING_PARSE_TIME = 0x20, /**< Parse time strings */
168 UCL_STRING_PARSE_NUMBER = UCL_STRING_PARSE_INT|UCL_STRING_PARSE_DOUBLE|UCL_STRING_PARSE_TIME, /**<
169 Parse passed string and detect number */
170 UCL_STRING_PARSE = UCL_STRING_PARSE_BOOLEAN|UCL_STRING_PARSE_NUMBER, /**<
171 Parse passed string (and detect booleans and numbers) */
172 UCL_STRING_PARSE_BYTES = 0x40 /**< Treat numbers as bytes */
173 } ucl_string_flags_t;
176 * Basic flags for an object
178 typedef enum ucl_object_flags {
179 UCL_OBJECT_ALLOCATED_KEY = (1 << 0), /**< An object has key allocated internally */
180 UCL_OBJECT_ALLOCATED_VALUE = (1 << 1), /**< An object has a string value allocated internally */
181 UCL_OBJECT_NEED_KEY_ESCAPE = (1 << 2), /**< The key of an object need to be escaped on output */
182 UCL_OBJECT_EPHEMERAL = (1 << 3), /**< Temporary object that does not need to be freed really */
183 UCL_OBJECT_MULTILINE = (1 << 4), /**< String should be displayed as multiline string */
184 UCL_OBJECT_MULTIVALUE = (1 << 5), /**< Object is a key with multiple values */
185 UCL_OBJECT_INHERITED = (1 << 6), /**< Object has been inherited from another */
186 UCL_OBJECT_BINARY = (1 << 7) /**< Object contains raw binary data */
187 } ucl_object_flags_t;
190 * Duplicate policy types
192 enum ucl_duplicate_strategy {
193 UCL_DUPLICATE_APPEND = 0, /**< Default policy to merge based on priorities */
194 UCL_DUPLICATE_MERGE, /**< Merge new object with old one */
195 UCL_DUPLICATE_REWRITE, /**< Rewrite old keys */
196 UCL_DUPLICATE_ERROR /**< Stop parsing on duplicate found */
202 enum ucl_parse_type {
203 UCL_PARSE_UCL = 0, /**< Default ucl format */
204 UCL_PARSE_MSGPACK, /**< Message pack input format */
205 UCL_PARSE_CSEXP /**< Canonical S-expressions */
209 * UCL object structure. Please mention that the most of fields should not be touched by
210 * UCL users. In future, this structure may be converted to private one.
212 typedef struct ucl_object_s {
217 int64_t iv; /**< Int value of an object */
218 const char *sv; /**< String value of an object */
219 double dv; /**< Double value of an object */
220 void *av; /**< Array */
221 void *ov; /**< Object */
222 void* ud; /**< Opaque user data */
224 const char *key; /**< Key of an object */
225 struct ucl_object_s *next; /**< Array handle */
226 struct ucl_object_s *prev; /**< Array handle */
227 uint32_t keylen; /**< Lenght of a key */
228 uint32_t len; /**< Size of an object */
229 uint32_t ref; /**< Reference count */
230 uint16_t flags; /**< Object flags */
231 uint16_t type; /**< Real type */
232 unsigned char* trash_stack[2]; /**< Pointer to allocated chunks */
236 * Destructor type for userdata objects
237 * @param ud user specified data pointer
239 typedef void (*ucl_userdata_dtor)(void *ud);
240 typedef const char* (*ucl_userdata_emitter)(void *ud);
245 * @defgroup utils Utility functions
246 * A number of utility functions simplify handling of UCL objects
251 * Copy and return a key of an object, returned key is zero-terminated
252 * @param obj CL object
253 * @return zero terminated key
255 UCL_EXTERN char* ucl_copy_key_trash (const ucl_object_t *obj);
258 * Copy and return a string value of an object, returned key is zero-terminated
259 * @param obj CL object
260 * @return zero terminated string representation of object value
262 UCL_EXTERN char* ucl_copy_value_trash (const ucl_object_t *obj);
265 * Creates a new object
268 UCL_EXTERN ucl_object_t* ucl_object_new (void) UCL_WARN_UNUSED_RESULT;
271 * Create new object with type specified
272 * @param type type of a new object
275 UCL_EXTERN ucl_object_t* ucl_object_typed_new (ucl_type_t type) UCL_WARN_UNUSED_RESULT;
278 * Create new object with type and priority specified
279 * @param type type of a new object
280 * @param priority priority of an object
283 UCL_EXTERN ucl_object_t* ucl_object_new_full (ucl_type_t type, unsigned priority)
284 UCL_WARN_UNUSED_RESULT;
287 * Create new object with userdata dtor
288 * @param dtor destructor function
291 UCL_EXTERN ucl_object_t* ucl_object_new_userdata (ucl_userdata_dtor dtor,
292 ucl_userdata_emitter emitter) UCL_WARN_UNUSED_RESULT;
295 * Perform deep copy of an object copying everything
296 * @param other object to copy
297 * @return new object with refcount equal to 1
299 UCL_EXTERN ucl_object_t * ucl_object_copy (const ucl_object_t *other)
300 UCL_WARN_UNUSED_RESULT;
303 * Return the type of an object
304 * @return the object type
306 UCL_EXTERN ucl_type_t ucl_object_type (const ucl_object_t *obj);
309 * Convert any string to an ucl object making the specified transformations
310 * @param str fixed size or NULL terminated string
311 * @param len length (if len is zero, than str is treated as NULL terminated)
312 * @param flags conversion flags
315 UCL_EXTERN ucl_object_t * ucl_object_fromstring_common (const char *str, size_t len,
316 enum ucl_string_flags flags) UCL_WARN_UNUSED_RESULT;
319 * Create a UCL object from the specified string
320 * @param str NULL terminated string, will be json escaped
323 UCL_EXTERN ucl_object_t *ucl_object_fromstring (const char *str) UCL_WARN_UNUSED_RESULT;
326 * Create a UCL object from the specified string
327 * @param str fixed size string, will be json escaped
328 * @param len length of a string
331 UCL_EXTERN ucl_object_t *ucl_object_fromlstring (const char *str,
332 size_t len) UCL_WARN_UNUSED_RESULT;
335 * Create an object from an integer number
339 UCL_EXTERN ucl_object_t* ucl_object_fromint (int64_t iv) UCL_WARN_UNUSED_RESULT;
342 * Create an object from a float number
346 UCL_EXTERN ucl_object_t* ucl_object_fromdouble (double dv) UCL_WARN_UNUSED_RESULT;
349 * Create an object from a boolean
350 * @param bv bool value
353 UCL_EXTERN ucl_object_t* ucl_object_frombool (bool bv) UCL_WARN_UNUSED_RESULT;
356 * Insert a object 'elt' to the hash 'top' and associate it with key 'key'
357 * @param top destination object (must be of type UCL_OBJECT)
358 * @param elt element to insert (must NOT be NULL)
359 * @param key key to associate with this object (either const or preallocated)
360 * @param keylen length of the key (or 0 for NULL terminated keys)
361 * @param copy_key make an internal copy of key
362 * @return true if key has been inserted
364 UCL_EXTERN bool ucl_object_insert_key (ucl_object_t *top, ucl_object_t *elt,
365 const char *key, size_t keylen, bool copy_key);
368 * Replace a object 'elt' to the hash 'top' and associate it with key 'key', old object will be unrefed,
369 * if no object has been found this function works like ucl_object_insert_key()
370 * @param top destination object (must be of type UCL_OBJECT)
371 * @param elt element to insert (must NOT be NULL)
372 * @param key key to associate with this object (either const or preallocated)
373 * @param keylen length of the key (or 0 for NULL terminated keys)
374 * @param copy_key make an internal copy of key
375 * @return true if key has been inserted
377 UCL_EXTERN bool ucl_object_replace_key (ucl_object_t *top, ucl_object_t *elt,
378 const char *key, size_t keylen, bool copy_key);
381 * Merge the keys from one object to another object. Overwrite on conflict
382 * @param top destination object (must be of type UCL_OBJECT)
383 * @param elt element to insert (must be of type UCL_OBJECT)
384 * @param copy copy rather than reference the elements
385 * @return true if all keys have been merged
387 UCL_EXTERN bool ucl_object_merge (ucl_object_t *top, ucl_object_t *elt, bool copy);
390 * Delete a object associated with key 'key', old object will be unrefered,
392 * @param key key associated to the object to remove
393 * @param keylen length of the key (or 0 for NULL terminated keys)
395 UCL_EXTERN bool ucl_object_delete_keyl (ucl_object_t *top,
396 const char *key, size_t keylen);
399 * Delete a object associated with key 'key', old object will be unrefered,
401 * @param key key associated to the object to remove
403 UCL_EXTERN bool ucl_object_delete_key (ucl_object_t *top,
408 * Removes `key` from `top` object, returning the object that was removed. This
409 * object is not released, caller must unref the returned object when it is no
412 * @param key key to remove
413 * @param keylen length of the key (or 0 for NULL terminated keys)
414 * @return removed object or NULL if object has not been found
416 UCL_EXTERN ucl_object_t* ucl_object_pop_keyl (ucl_object_t *top, const char *key,
417 size_t keylen) UCL_WARN_UNUSED_RESULT;
420 * Removes `key` from `top` object returning the object that was removed. This
421 * object is not released, caller must unref the returned object when it is no
424 * @param key key to remove
425 * @return removed object or NULL if object has not been found
427 UCL_EXTERN ucl_object_t* ucl_object_pop_key (ucl_object_t *top, const char *key)
428 UCL_WARN_UNUSED_RESULT;
431 * Insert a object 'elt' to the hash 'top' and associate it with key 'key', if
432 * the specified key exist, try to merge its content
433 * @param top destination object (must be of type UCL_OBJECT)
434 * @param elt element to insert (must NOT be NULL)
435 * @param key key to associate with this object (either const or preallocated)
436 * @param keylen length of the key (or 0 for NULL terminated keys)
437 * @param copy_key make an internal copy of key
438 * @return true if key has been inserted
440 UCL_EXTERN bool ucl_object_insert_key_merged (ucl_object_t *top, ucl_object_t *elt,
441 const char *key, size_t keylen, bool copy_key);
444 * Append an element to the end of array object
445 * @param top destination object (must NOT be NULL)
446 * @param elt element to append (must NOT be NULL)
447 * @return true if value has been inserted
449 UCL_EXTERN bool ucl_array_append (ucl_object_t *top,
453 * Append an element to the start of array object
454 * @param top destination object (must NOT be NULL)
455 * @param elt element to append (must NOT be NULL)
456 * @return true if value has been inserted
458 UCL_EXTERN bool ucl_array_prepend (ucl_object_t *top,
462 * Merge all elements of second array into the first array
463 * @param top destination array (must be of type UCL_ARRAY)
464 * @param elt array to copy elements from (must be of type UCL_ARRAY)
465 * @param copy copy elements instead of referencing them
466 * @return true if arrays were merged
468 UCL_EXTERN bool ucl_array_merge (ucl_object_t *top, ucl_object_t *elt,
472 * Removes an element `elt` from the array `top`, returning the object that was
473 * removed. This object is not released, caller must unref the returned object
474 * when it is no longer needed.
475 * @param top array ucl object
476 * @param elt element to remove
477 * @return removed element or NULL if `top` is NULL or not an array
479 UCL_EXTERN ucl_object_t* ucl_array_delete (ucl_object_t *top,
483 * Returns the first element of the array `top`
484 * @param top array ucl object
485 * @return element or NULL if `top` is NULL or not an array
487 UCL_EXTERN const ucl_object_t* ucl_array_head (const ucl_object_t *top);
490 * Returns the last element of the array `top`
491 * @param top array ucl object
492 * @return element or NULL if `top` is NULL or not an array
494 UCL_EXTERN const ucl_object_t* ucl_array_tail (const ucl_object_t *top);
497 * Removes the last element from the array `top`, returning the object that was
498 * removed. This object is not released, caller must unref the returned object
499 * when it is no longer needed.
500 * @param top array ucl object
501 * @return removed element or NULL if `top` is NULL or not an array
503 UCL_EXTERN ucl_object_t* ucl_array_pop_last (ucl_object_t *top);
506 * Removes the first element from the array `top`, returning the object that was
507 * removed. This object is not released, caller must unref the returned object
508 * when it is no longer needed.
509 * @param top array ucl object
510 * @return removed element or NULL if `top` is NULL or not an array
512 UCL_EXTERN ucl_object_t* ucl_array_pop_first (ucl_object_t *top);
515 * Return object identified by index of the array `top`
516 * @param top object to get a key from (must be of type UCL_ARRAY)
517 * @param index array index to return
518 * @return object at the specified index or NULL if index is not found
520 UCL_EXTERN const ucl_object_t* ucl_array_find_index (const ucl_object_t *top,
524 * Return the index of `elt` in the array `top`
525 * @param top object to get a key from (must be of type UCL_ARRAY)
526 * @param elt element to find index of (must NOT be NULL)
527 * @return index of `elt` in the array `top or (unsigned int)-1 if `elt` is not found
529 UCL_EXTERN unsigned int ucl_array_index_of (ucl_object_t *top,
533 * Replace an element in an array with a different element, returning the object
534 * that was replaced. This object is not released, caller must unref the
535 * returned object when it is no longer needed.
536 * @param top destination object (must be of type UCL_ARRAY)
537 * @param elt element to append (must NOT be NULL)
538 * @param index array index in destination to overwrite with elt
539 * @return object that was replaced or NULL if index is not found
542 ucl_array_replace_index (ucl_object_t *top, ucl_object_t *elt,
546 * Append a element to another element forming an implicit array
547 * @param head head to append (may be NULL)
548 * @param elt new element
549 * @return the new implicit array
551 UCL_EXTERN ucl_object_t * ucl_elt_append (ucl_object_t *head,
555 * Converts an object to double value
556 * @param obj CL object
557 * @param target target double variable
558 * @return true if conversion was successful
560 UCL_EXTERN bool ucl_object_todouble_safe (const ucl_object_t *obj, double *target);
563 * Unsafe version of \ref ucl_obj_todouble_safe
564 * @param obj CL object
565 * @return double value
567 UCL_EXTERN double ucl_object_todouble (const ucl_object_t *obj);
570 * Converts an object to integer value
571 * @param obj CL object
572 * @param target target integer variable
573 * @return true if conversion was successful
575 UCL_EXTERN bool ucl_object_toint_safe (const ucl_object_t *obj, int64_t *target);
578 * Unsafe version of \ref ucl_obj_toint_safe
579 * @param obj CL object
582 UCL_EXTERN int64_t ucl_object_toint (const ucl_object_t *obj);
585 * Converts an object to boolean value
586 * @param obj CL object
587 * @param target target boolean variable
588 * @return true if conversion was successful
590 UCL_EXTERN bool ucl_object_toboolean_safe (const ucl_object_t *obj, bool *target);
593 * Unsafe version of \ref ucl_obj_toboolean_safe
594 * @param obj CL object
595 * @return boolean value
597 UCL_EXTERN bool ucl_object_toboolean (const ucl_object_t *obj);
600 * Converts an object to string value
601 * @param obj CL object
602 * @param target target string variable, no need to free value
603 * @return true if conversion was successful
605 UCL_EXTERN bool ucl_object_tostring_safe (const ucl_object_t *obj, const char **target);
608 * Unsafe version of \ref ucl_obj_tostring_safe
609 * @param obj CL object
610 * @return string value
612 UCL_EXTERN const char* ucl_object_tostring (const ucl_object_t *obj);
615 * Convert any object to a string in JSON notation if needed
616 * @param obj CL object
617 * @return string value
619 UCL_EXTERN const char* ucl_object_tostring_forced (const ucl_object_t *obj);
622 * Return string as char * and len, string may be not zero terminated, more efficient that \ref ucl_obj_tostring as it
623 * allows zero-copy (if #UCL_PARSER_ZEROCOPY has been used during parsing)
624 * @param obj CL object
625 * @param target target string variable, no need to free value
626 * @param tlen target length
627 * @return true if conversion was successful
629 UCL_EXTERN bool ucl_object_tolstring_safe (const ucl_object_t *obj,
630 const char **target, size_t *tlen);
633 * Unsafe version of \ref ucl_obj_tolstring_safe
634 * @param obj CL object
635 * @return string value
637 UCL_EXTERN const char* ucl_object_tolstring (const ucl_object_t *obj, size_t *tlen);
640 * Return object identified by a key in the specified object
641 * @param obj object to get a key from (must be of type UCL_OBJECT)
642 * @param key key to search
643 * @return object matching the specified key or NULL if key was not found
645 UCL_EXTERN const ucl_object_t* ucl_object_find_key (const ucl_object_t *obj,
649 * Return object identified by a key in the specified object, if the first key is
650 * not found then look for the next one. This process is repeated unless
651 * the next argument in the list is not NULL. So, `ucl_object_find_any_key(obj, key, NULL)`
652 * is equal to `ucl_object_find_key(obj, key)`
653 * @param obj object to get a key from (must be of type UCL_OBJECT)
654 * @param key key to search
655 * @param ... list of alternative keys to search (NULL terminated)
656 * @return object matching the specified key or NULL if key was not found
658 UCL_EXTERN const ucl_object_t* ucl_object_find_any_key (const ucl_object_t *obj,
659 const char *key, ...);
662 * Return object identified by a fixed size key in the specified object
663 * @param obj object to get a key from (must be of type UCL_OBJECT)
664 * @param key key to search
665 * @param klen length of a key
666 * @return object matching the specified key or NULL if key was not found
668 UCL_EXTERN const ucl_object_t* ucl_object_find_keyl (const ucl_object_t *obj,
669 const char *key, size_t klen);
672 * Return object identified by dot notation string
673 * @param obj object to search in
674 * @param path dot.notation.path to the path to lookup. May use numeric .index on arrays
675 * @return object matched the specified path or NULL if path is not found
677 UCL_EXTERN const ucl_object_t *ucl_lookup_path (const ucl_object_t *obj,
681 * Return object identified by object notation string using arbitrary delimiter
682 * @param obj object to search in
683 * @param path dot.notation.path to the path to lookup. May use numeric .index on arrays
684 * @param sep the sepatorator to use in place of . (incase keys have . in them)
685 * @return object matched the specified path or NULL if path is not found
687 UCL_EXTERN const ucl_object_t *ucl_lookup_path_char (const ucl_object_t *obj,
688 const char *path, char sep);
691 * Returns a key of an object as a NULL terminated string
692 * @param obj CL object
693 * @return key or NULL if there is no key
695 UCL_EXTERN const char* ucl_object_key (const ucl_object_t *obj);
698 * Returns a key of an object as a fixed size string (may be more efficient)
699 * @param obj CL object
700 * @param len target key length
701 * @return key pointer
703 UCL_EXTERN const char* ucl_object_keyl (const ucl_object_t *obj, size_t *len);
706 * Increase reference count for an object
707 * @param obj object to ref
708 * @return the referenced object
710 UCL_EXTERN ucl_object_t* ucl_object_ref (const ucl_object_t *obj);
714 * @param obj ucl object to free
716 UCL_DEPRECATED(UCL_EXTERN void ucl_object_free (ucl_object_t *obj));
719 * Decrease reference count for an object
720 * @param obj object to unref
722 UCL_EXTERN void ucl_object_unref (ucl_object_t *obj);
725 * Compare objects `o1` and `o2`
726 * @param o1 the first object
727 * @param o2 the second object
728 * @return values >0, 0 and <0 if `o1` is more than, equal and less than `o2`.
729 * The order of comparison:
732 * 3) Content of objects
734 UCL_EXTERN int ucl_object_compare (const ucl_object_t *o1,
735 const ucl_object_t *o2);
738 * Sort UCL array using `cmp` compare function
742 UCL_EXTERN void ucl_object_array_sort (ucl_object_t *ar,
743 int (*cmp)(const ucl_object_t **o1, const ucl_object_t **o2));
746 * Get the priority for specific UCL object
747 * @param obj any ucl object
748 * @return priority of an object
750 UCL_EXTERN unsigned int ucl_object_get_priority (const ucl_object_t *obj);
753 * Set explicit priority of an object.
754 * @param obj any ucl object
755 * @param priority new priroity value (only 4 least significant bits are considred)
757 UCL_EXTERN void ucl_object_set_priority (ucl_object_t *obj,
758 unsigned int priority);
761 * Opaque iterator object
763 typedef void* ucl_object_iter_t;
766 * Get next key from an object
767 * @param obj object to iterate
768 * @param iter opaque iterator, must be set to NULL on the first call:
769 * ucl_object_iter_t it = NULL;
770 * while ((cur = ucl_iterate_object (obj, &it)) != NULL) ...
771 * @return the next object or NULL
773 UCL_EXTERN const ucl_object_t* ucl_iterate_object (const ucl_object_t *obj,
774 ucl_object_iter_t *iter, bool expand_values);
777 * Create new safe iterator for the specified object
778 * @param obj object to iterate
779 * @return new iterator object that should be used with safe iterators API only
781 UCL_EXTERN ucl_object_iter_t ucl_object_iterate_new (const ucl_object_t *obj)
782 UCL_WARN_UNUSED_RESULT;
784 * Reset initialized iterator to a new object
785 * @param obj new object to iterate
786 * @return modified iterator object
788 UCL_EXTERN ucl_object_iter_t ucl_object_iterate_reset (ucl_object_iter_t it,
789 const ucl_object_t *obj);
792 * Get the next object from the `obj`. This fucntion iterates over arrays, objects
793 * and implicit arrays
794 * @param iter safe iterator
795 * @return the next object in sequence
797 UCL_EXTERN const ucl_object_t* ucl_object_iterate_safe (ucl_object_iter_t iter,
801 * Free memory associated with the safe iterator
802 * @param it safe iterator object
804 UCL_EXTERN void ucl_object_iterate_free (ucl_object_iter_t it);
810 * @defgroup parser Parsing functions
811 * These functions are used to parse UCL objects
817 * Macro handler for a parser
818 * @param data the content of macro
819 * @param len the length of content
820 * @param arguments arguments object
821 * @param ud opaque user data
822 * @param err error pointer
823 * @return true if macro has been parsed
825 typedef bool (*ucl_macro_handler) (const unsigned char *data, size_t len,
826 const ucl_object_t *arguments,
830 * Context dependent macro handler for a parser
831 * @param data the content of macro
832 * @param len the length of content
833 * @param arguments arguments object
834 * @param context previously parsed context
835 * @param ud opaque user data
836 * @param err error pointer
837 * @return true if macro has been parsed
839 typedef bool (*ucl_context_macro_handler) (const unsigned char *data, size_t len,
840 const ucl_object_t *arguments,
841 const ucl_object_t *context,
848 * Creates new parser object
849 * @param pool pool to allocate memory from
850 * @return new parser object
852 UCL_EXTERN struct ucl_parser* ucl_parser_new (int flags);
855 * Sets the default priority for the parser applied to chunks that does not
856 * specify priority explicitly
857 * @param parser parser object
858 * @param prio default priority (0 .. 16)
859 * @return true if parser's default priority was set
861 UCL_EXTERN bool ucl_parser_set_default_priority (struct ucl_parser *parser,
864 * Register new handler for a macro
865 * @param parser parser object
866 * @param macro macro name (without leading dot)
867 * @param handler handler (it is called immediately after macro is parsed)
868 * @param ud opaque user data for a handler
870 UCL_EXTERN void ucl_parser_register_macro (struct ucl_parser *parser,
872 ucl_macro_handler handler, void* ud);
875 * Register new context dependent handler for a macro
876 * @param parser parser object
877 * @param macro macro name (without leading dot)
878 * @param handler handler (it is called immediately after macro is parsed)
879 * @param ud opaque user data for a handler
881 UCL_EXTERN void ucl_parser_register_context_macro (struct ucl_parser *parser,
883 ucl_context_macro_handler handler,
887 * Handler to detect unregistered variables
888 * @param data variable data
889 * @param len length of variable
890 * @param replace (out) replace value for variable
891 * @param replace_len (out) replace length for variable
892 * @param need_free (out) UCL will free `dest` after usage
893 * @param ud opaque userdata
894 * @return true if variable
896 typedef bool (*ucl_variable_handler) (const unsigned char *data, size_t len,
897 unsigned char **replace, size_t *replace_len, bool *need_free, void* ud);
900 * Register new parser variable
901 * @param parser parser object
902 * @param var variable name
903 * @param value variable value
905 UCL_EXTERN void ucl_parser_register_variable (struct ucl_parser *parser, const char *var,
909 * Set handler for unknown variables
910 * @param parser parser structure
911 * @param handler desired handler
912 * @param ud opaque data for the handler
914 UCL_EXTERN void ucl_parser_set_variables_handler (struct ucl_parser *parser,
915 ucl_variable_handler handler, void *ud);
918 * Load new chunk to a parser
919 * @param parser parser structure
920 * @param data the pointer to the beginning of a chunk
921 * @param len the length of a chunk
922 * @return true if chunk has been added and false in case of error
924 UCL_EXTERN bool ucl_parser_add_chunk (struct ucl_parser *parser,
925 const unsigned char *data, size_t len);
928 * Load new chunk to a parser with the specified priority
929 * @param parser parser structure
930 * @param data the pointer to the beginning of a chunk
931 * @param len the length of a chunk
932 * @param priority the desired priority of a chunk (only 4 least significant bits
933 * are considered for this parameter)
934 * @return true if chunk has been added and false in case of error
936 UCL_EXTERN bool ucl_parser_add_chunk_priority (struct ucl_parser *parser,
937 const unsigned char *data, size_t len, unsigned priority);
940 * Full version of ucl_add_chunk with priority and duplicate strategy
941 * @param parser parser structure
942 * @param data the pointer to the beginning of a chunk
943 * @param len the length of a chunk
944 * @param priority the desired priority of a chunk (only 4 least significant bits
945 * are considered for this parameter)
946 * @param strat duplicates merging strategy
947 * @param parse_type input format
948 * @return true if chunk has been added and false in case of error
950 UCL_EXTERN bool ucl_parser_add_chunk_full (struct ucl_parser *parser,
951 const unsigned char *data, size_t len, unsigned priority,
952 enum ucl_duplicate_strategy strat, enum ucl_parse_type parse_type);
955 * Load ucl object from a string
956 * @param parser parser structure
957 * @param data the pointer to the string
958 * @param len the length of the string, if `len` is 0 then `data` must be zero-terminated string
959 * @return true if string has been added and false in case of error
961 UCL_EXTERN bool ucl_parser_add_string (struct ucl_parser *parser,
962 const char *data,size_t len);
965 * Load ucl object from a string
966 * @param parser parser structure
967 * @param data the pointer to the string
968 * @param len the length of the string, if `len` is 0 then `data` must be zero-terminated string
969 * @param priority the desired priority of a chunk (only 4 least significant bits
970 * are considered for this parameter)
971 * @return true if string has been added and false in case of error
973 UCL_EXTERN bool ucl_parser_add_string_priority (struct ucl_parser *parser,
974 const char *data, size_t len, unsigned priority);
977 * Load and add data from a file
978 * @param parser parser structure
979 * @param filename the name of file
980 * @param err if *err is NULL it is set to parser error
981 * @return true if chunk has been added and false in case of error
983 UCL_EXTERN bool ucl_parser_add_file (struct ucl_parser *parser,
984 const char *filename);
987 * Load and add data from a file
988 * @param parser parser structure
989 * @param filename the name of file
990 * @param err if *err is NULL it is set to parser error
991 * @param priority the desired priority of a chunk (only 4 least significant bits
992 * are considered for this parameter)
993 * @return true if chunk has been added and false in case of error
995 UCL_EXTERN bool ucl_parser_add_file_priority (struct ucl_parser *parser,
996 const char *filename, unsigned priority);
999 * Load and add data from a file descriptor
1000 * @param parser parser structure
1001 * @param filename the name of file
1002 * @param err if *err is NULL it is set to parser error
1003 * @return true if chunk has been added and false in case of error
1005 UCL_EXTERN bool ucl_parser_add_fd (struct ucl_parser *parser,
1009 * Load and add data from a file descriptor
1010 * @param parser parser structure
1011 * @param filename the name of file
1012 * @param err if *err is NULL it is set to parser error
1013 * @param priority the desired priority of a chunk (only 4 least significant bits
1014 * are considered for this parameter)
1015 * @return true if chunk has been added and false in case of error
1017 UCL_EXTERN bool ucl_parser_add_fd_priority (struct ucl_parser *parser,
1018 int fd, unsigned priority);
1021 * Provide a UCL_ARRAY of paths to search for include files. The object is
1022 * copied so caller must unref the object.
1023 * @param parser parser structure
1024 * @param paths UCL_ARRAY of paths to search
1025 * @return true if the path search array was replaced in the parser
1027 UCL_EXTERN bool ucl_set_include_path (struct ucl_parser *parser,
1028 ucl_object_t *paths);
1031 * Get a top object for a parser (refcount is increased)
1032 * @param parser parser structure
1033 * @param err if *err is NULL it is set to parser error
1034 * @return top parser object or NULL
1036 UCL_EXTERN ucl_object_t* ucl_parser_get_object (struct ucl_parser *parser);
1039 * Get the error string if parsing has been failed
1040 * @param parser parser object
1041 * @return error description
1043 UCL_EXTERN const char *ucl_parser_get_error(struct ucl_parser *parser);
1046 * Get the code of the last error
1047 * @param parser parser object
1048 * @return error code
1050 UCL_EXTERN int ucl_parser_get_error_code(struct ucl_parser *parser);
1053 * Get the current column number within parser
1054 * @param parser parser object
1055 * @return current column number
1057 UCL_EXTERN unsigned ucl_parser_get_column(struct ucl_parser *parser);
1060 * Get the current line number within parser
1061 * @param parser parser object
1062 * @return current line number
1064 UCL_EXTERN unsigned ucl_parser_get_linenum(struct ucl_parser *parser);
1067 * Clear the error in the parser
1068 * @param parser parser object
1070 UCL_EXTERN void ucl_parser_clear_error(struct ucl_parser *parser);
1073 * Free ucl parser object
1074 * @param parser parser object
1076 UCL_EXTERN void ucl_parser_free (struct ucl_parser *parser);
1079 * Add new public key to parser for signatures check
1080 * @param parser parser object
1081 * @param key PEM representation of a key
1082 * @param len length of the key
1083 * @param err if *err is NULL it is set to parser error
1084 * @return true if a key has been successfully added
1086 UCL_EXTERN bool ucl_pubkey_add (struct ucl_parser *parser, const unsigned char *key, size_t len);
1089 * Set FILENAME and CURDIR variables in parser
1090 * @param parser parser object
1091 * @param filename filename to set or NULL to set FILENAME to "undef" and CURDIR to getcwd()
1092 * @param need_expand perform realpath() if this variable is true and filename is not NULL
1093 * @return true if variables has been set
1095 UCL_EXTERN bool ucl_parser_set_filevars (struct ucl_parser *parser, const char *filename,
1101 * @defgroup emitter Emitting functions
1102 * These functions are used to serialise UCL objects to some string representation.
1107 struct ucl_emitter_context;
1109 * Structure using for emitter callbacks
1111 struct ucl_emitter_functions {
1112 /** Append a single character */
1113 int (*ucl_emitter_append_character) (unsigned char c, size_t nchars, void *ud);
1114 /** Append a string of a specified length */
1115 int (*ucl_emitter_append_len) (unsigned const char *str, size_t len, void *ud);
1116 /** Append a 64 bit integer */
1117 int (*ucl_emitter_append_int) (int64_t elt, void *ud);
1118 /** Append floating point element */
1119 int (*ucl_emitter_append_double) (double elt, void *ud);
1120 /** Free userdata */
1121 void (*ucl_emitter_free_func)(void *ud);
1122 /** Opaque userdata pointer */
1126 struct ucl_emitter_operations {
1127 /** Write a primitive element */
1128 void (*ucl_emitter_write_elt) (struct ucl_emitter_context *ctx,
1129 const ucl_object_t *obj, bool first, bool print_key);
1130 /** Start ucl object */
1131 void (*ucl_emitter_start_object) (struct ucl_emitter_context *ctx,
1132 const ucl_object_t *obj, bool print_key);
1133 /** End ucl object */
1134 void (*ucl_emitter_end_object) (struct ucl_emitter_context *ctx,
1135 const ucl_object_t *obj);
1136 /** Start ucl array */
1137 void (*ucl_emitter_start_array) (struct ucl_emitter_context *ctx,
1138 const ucl_object_t *obj, bool print_key);
1139 void (*ucl_emitter_end_array) (struct ucl_emitter_context *ctx,
1140 const ucl_object_t *obj);
1144 * Structure that defines emitter functions
1146 struct ucl_emitter_context {
1147 /** Name of emitter (e.g. json, compact_json) */
1149 /** Unique id (e.g. UCL_EMIT_JSON for standard emitters */
1151 /** A set of output functions */
1152 const struct ucl_emitter_functions *func;
1153 /** A set of output operations */
1154 const struct ucl_emitter_operations *ops;
1155 /** Current amount of indent tabs */
1156 unsigned int indent;
1157 /** Top level object */
1158 const ucl_object_t *top;
1159 /** The rest of context */
1160 unsigned char data[1];
1164 * Emit object to a string
1166 * @param emit_type if type is #UCL_EMIT_JSON then emit json, if type is
1167 * #UCL_EMIT_CONFIG then emit config like object
1168 * @return dump of an object (must be freed after using) or NULL in case of error
1170 UCL_EXTERN unsigned char *ucl_object_emit (const ucl_object_t *obj,
1171 enum ucl_emitter emit_type);
1174 * Emit object to a string that can contain `\0` inside
1176 * @param emit_type if type is #UCL_EMIT_JSON then emit json, if type is
1177 * #UCL_EMIT_CONFIG then emit config like object
1178 * @param len the resulting length
1179 * @return dump of an object (must be freed after using) or NULL in case of error
1181 UCL_EXTERN unsigned char *ucl_object_emit_len (const ucl_object_t *obj,
1182 enum ucl_emitter emit_type, size_t *len);
1185 * Emit object to a string
1187 * @param emit_type if type is #UCL_EMIT_JSON then emit json, if type is
1188 * #UCL_EMIT_CONFIG then emit config like object
1189 * @param emitter a set of emitter functions
1190 * @return dump of an object (must be freed after using) or NULL in case of error
1192 UCL_EXTERN bool ucl_object_emit_full (const ucl_object_t *obj,
1193 enum ucl_emitter emit_type,
1194 struct ucl_emitter_functions *emitter);
1197 * Start streamlined UCL object emitter
1198 * @param obj top UCL object
1199 * @param emit_type emit type
1200 * @param emitter a set of emitter functions
1201 * @return new streamlined context that should be freed by
1202 * `ucl_object_emit_streamline_finish`
1204 UCL_EXTERN struct ucl_emitter_context* ucl_object_emit_streamline_new (
1205 const ucl_object_t *obj, enum ucl_emitter emit_type,
1206 struct ucl_emitter_functions *emitter);
1209 * Start object or array container for the streamlined output
1210 * @param ctx streamlined context
1211 * @param obj container object
1213 UCL_EXTERN void ucl_object_emit_streamline_start_container (
1214 struct ucl_emitter_context *ctx, const ucl_object_t *obj);
1216 * Add a complete UCL object to streamlined output
1217 * @param ctx streamlined context
1218 * @param obj object to output
1220 UCL_EXTERN void ucl_object_emit_streamline_add_object (
1221 struct ucl_emitter_context *ctx, const ucl_object_t *obj);
1223 * End previously added container
1224 * @param ctx streamlined context
1226 UCL_EXTERN void ucl_object_emit_streamline_end_container (
1227 struct ucl_emitter_context *ctx);
1229 * Terminate streamlined container finishing all containers in it
1230 * @param ctx streamlined context
1232 UCL_EXTERN void ucl_object_emit_streamline_finish (
1233 struct ucl_emitter_context *ctx);
1236 * Returns functions to emit object to memory
1237 * @param pmem target pointer (should be freed by caller)
1238 * @return emitter functions structure
1240 UCL_EXTERN struct ucl_emitter_functions* ucl_object_emit_memory_funcs (
1244 * Returns functions to emit object to FILE *
1245 * @param fp FILE * object
1246 * @return emitter functions structure
1248 UCL_EXTERN struct ucl_emitter_functions* ucl_object_emit_file_funcs (
1251 * Returns functions to emit object to a file descriptor
1252 * @param fd file descriptor
1253 * @return emitter functions structure
1255 UCL_EXTERN struct ucl_emitter_functions* ucl_object_emit_fd_funcs (
1259 * Free emitter functions
1260 * @param f pointer to functions
1262 UCL_EXTERN void ucl_object_emit_funcs_free (struct ucl_emitter_functions *f);
1267 * @defgroup schema Schema functions
1268 * These functions are used to validate UCL objects using json schema format
1274 * Used to define UCL schema error
1276 enum ucl_schema_error_code {
1277 UCL_SCHEMA_OK = 0, /**< no error */
1278 UCL_SCHEMA_TYPE_MISMATCH, /**< type of object is incorrect */
1279 UCL_SCHEMA_INVALID_SCHEMA, /**< schema is invalid */
1280 UCL_SCHEMA_MISSING_PROPERTY,/**< one or more missing properties */
1281 UCL_SCHEMA_CONSTRAINT, /**< constraint found */
1282 UCL_SCHEMA_MISSING_DEPENDENCY, /**< missing dependency */
1283 UCL_SCHEMA_UNKNOWN /**< generic error */
1287 * Generic ucl schema error
1289 struct ucl_schema_error {
1290 enum ucl_schema_error_code code; /**< error code */
1291 char msg[128]; /**< error message */
1292 const ucl_object_t *obj; /**< object where error occured */
1296 * Validate object `obj` using schema object `schema`.
1297 * @param schema schema object
1298 * @param obj object to validate
1299 * @param err error pointer, if this parameter is not NULL and error has been
1300 * occured, then `err` is filled with the exact error definition.
1301 * @return true if `obj` is valid using `schema`
1303 UCL_EXTERN bool ucl_object_validate (const ucl_object_t *schema,
1304 const ucl_object_t *obj, struct ucl_schema_error *err);
1312 * XXX: Poorly named API functions, need to replace them with the appropriate
1313 * named function. All API functions *must* use naming ucl_object_*. Usage of
1314 * ucl_obj* should be avoided.
1316 #define ucl_obj_todouble_safe ucl_object_todouble_safe
1317 #define ucl_obj_todouble ucl_object_todouble
1318 #define ucl_obj_tostring ucl_object_tostring
1319 #define ucl_obj_tostring_safe ucl_object_tostring_safe
1320 #define ucl_obj_tolstring ucl_object_tolstring
1321 #define ucl_obj_tolstring_safe ucl_object_tolstring_safe
1322 #define ucl_obj_toint ucl_object_toint
1323 #define ucl_obj_toint_safe ucl_object_toint_safe
1324 #define ucl_obj_toboolean ucl_object_toboolean
1325 #define ucl_obj_toboolean_safe ucl_object_toboolean_safe
1326 #define ucl_obj_get_key ucl_object_find_key
1327 #define ucl_obj_get_keyl ucl_object_find_keyl
1328 #define ucl_obj_unref ucl_object_unref
1329 #define ucl_obj_ref ucl_object_ref
1330 #define ucl_obj_free ucl_object_free