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dxml.h@26:c14d034d7459, 2020-07-10 (annotated)

Committer:
bosko001
Date:
Fri Jul 10 11:33:05 2020 +0200
Revision:
26:c14d034d7459
Parent:
4:7abcf4543282 
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Who changed what in which revision?

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bosko001 2:45b351b4fc2a 1 /* dxml.h
bosko001 2:45b351b4fc2a 2 *
bosko001 4:7abcf4543282 3 * softverski modul korigovan 11.04.2020
bosko001 2:45b351b4fc2a 4 *
bosko001 2:45b351b4fc2a 5 */
bosko001 2:45b351b4fc2a 6
bosko001 2:45b351b4fc2a 7 #ifndef _dxml_H
bosko001 2:45b351b4fc2a 8 #define _dxml_H
bosko001 2:45b351b4fc2a 9
bosko001 2:45b351b4fc2a 10 #include <stdlib.h>
bosko001 2:45b351b4fc2a 11 #include <stdio.h>
bosko001 2:45b351b4fc2a 12 #include <stdarg.h>
bosko001 2:45b351b4fc2a 13 //#include <fcntl.h>
bosko001 2:45b351b4fc2a 14
bosko001 2:45b351b4fc2a 15 #ifdef __cplusplus
bosko001 2:45b351b4fc2a 16 extern "C" {
bosko001 2:45b351b4fc2a 17 #endif
bosko001 2:45b351b4fc2a 18
bosko001 2:45b351b4fc2a 19 #define dxml_BUFSIZE 1024 // size of internal memory buffers
bosko001 2:45b351b4fc2a 20 #define dxml_NAMEM 0x80 // name is malloced
bosko001 2:45b351b4fc2a 21 #define dxml_TXTM 0x40 // txt is malloced
bosko001 2:45b351b4fc2a 22 #define dxml_DUP 0x20 // attribute name and value are strduped
bosko001 2:45b351b4fc2a 23
bosko001 2:45b351b4fc2a 24 typedef struct dxml *dxml_t;
bosko001 2:45b351b4fc2a 25 struct dxml {
bosko001 2:45b351b4fc2a 26 char *name; // tag name
bosko001 2:45b351b4fc2a 27 char **attr; // tag attributes { name, value, name, value, ... NULL }
bosko001 2:45b351b4fc2a 28 char *txt; // tag character content, empty string if none
bosko001 2:45b351b4fc2a 29 size_t off; // tag offset from start of parent tag character content
bosko001 2:45b351b4fc2a 30 dxml_t next; // next tag with same name in this section at this depth
bosko001 2:45b351b4fc2a 31 dxml_t sibling; // next tag with different name in same section and depth
bosko001 2:45b351b4fc2a 32 dxml_t ordered; // next tag, same section and depth, in original order
bosko001 2:45b351b4fc2a 33 dxml_t child; // head of sub tag list, NULL if none
bosko001 2:45b351b4fc2a 34 dxml_t parent; // parent tag, NULL if current tag is root tag
bosko001 2:45b351b4fc2a 35 short flags; // additional information
bosko001 2:45b351b4fc2a 36 };
bosko001 2:45b351b4fc2a 37
bosko001 2:45b351b4fc2a 38 // Given a string of xml data and its length, parses it and creates an dxml
bosko001 2:45b351b4fc2a 39 // structure. For efficiency, modifies the data by adding null terminators
bosko001 2:45b351b4fc2a 40 // and decoding ampersand sequences. If you don't want this, copy the data and
bosko001 2:45b351b4fc2a 41 // pass in the copy. Returns NULL on failure.
bosko001 2:45b351b4fc2a 42 dxml_t dxml_parse_str(char *s, size_t len);
bosko001 2:45b351b4fc2a 43
bosko001 2:45b351b4fc2a 44 // A wrapper for dxml_parse_str() that accepts a file descriptor. First
bosko001 2:45b351b4fc2a 45 // attempts to mem map the file. Failing that, reads the file into memory.
bosko001 2:45b351b4fc2a 46 // Returns NULL on failure.
bosko001 2:45b351b4fc2a 47 //dxml_t dxml_parse_fd(int fd);
bosko001 2:45b351b4fc2a 48
bosko001 2:45b351b4fc2a 49 // a wrapper for dxml_parse_fd() that accepts a file name
bosko001 2:45b351b4fc2a 50 dxml_t dxml_parse_file(const char *file);
bosko001 4:7abcf4543282 51
bosko001 2:45b351b4fc2a 52 // Wrapper for dxml_parse_str() that accepts a file stream. Reads the entire
bosko001 2:45b351b4fc2a 53 // stream into memory and then parses it. For xml files, use dxml_parse_file()
bosko001 2:45b351b4fc2a 54 // or dxml_parse_fd()
bosko001 2:45b351b4fc2a 55 dxml_t dxml_parse_fp(FILE *fp);
bosko001 2:45b351b4fc2a 56
bosko001 2:45b351b4fc2a 57 // returns the first child tag (one level deeper) with the given name or NULL
bosko001 2:45b351b4fc2a 58 // if not found
bosko001 2:45b351b4fc2a 59 dxml_t dxml_child(dxml_t xml, const char *name);
bosko001 2:45b351b4fc2a 60
bosko001 2:45b351b4fc2a 61 // returns the next tag of the same name in the same section and depth or NULL
bosko001 2:45b351b4fc2a 62 // if not found
bosko001 2:45b351b4fc2a 63 #define dxml_next(xml) ((xml) ? xml->next : NULL)
bosko001 2:45b351b4fc2a 64
bosko001 2:45b351b4fc2a 65 // Returns the Nth tag with the same name in the same section at the same depth
bosko001 2:45b351b4fc2a 66 // or NULL if not found. An index of 0 returns the tag given.
bosko001 2:45b351b4fc2a 67 dxml_t dxml_idx(dxml_t xml, int idx);
bosko001 2:45b351b4fc2a 68
bosko001 2:45b351b4fc2a 69 // returns the name of the given tag
bosko001 2:45b351b4fc2a 70 #define dxml_name(xml) ((xml) ? xml->name : NULL)
bosko001 2:45b351b4fc2a 71
bosko001 2:45b351b4fc2a 72 // returns the given tag's character content or empty string if none
bosko001 2:45b351b4fc2a 73 #define dxml_txt(xml) ((xml) ? xml->txt : "")
bosko001 2:45b351b4fc2a 74
bosko001 2:45b351b4fc2a 75 // returns the value of the requested tag attribute, or NULL if not found
bosko001 2:45b351b4fc2a 76 const char *dxml_attr(dxml_t xml, const char *attr);
bosko001 2:45b351b4fc2a 77
bosko001 2:45b351b4fc2a 78 // Traverses the dxml sturcture to retrieve a specific subtag. Takes a
bosko001 2:45b351b4fc2a 79 // variable length list of tag names and indexes. The argument list must be
bosko001 4:7abcf4543282 80 // terminated by either an index of -1 or an empty string tag name. Example:
bosko001 2:45b351b4fc2a 81 // title = dxml_get(library, "shelf", 0, "book", 2, "title", -1);
bosko001 2:45b351b4fc2a 82 // This retrieves the title of the 3rd book on the 1st shelf of library.
bosko001 2:45b351b4fc2a 83 // Returns NULL if not found.
bosko001 2:45b351b4fc2a 84 dxml_t dxml_get(dxml_t xml, ...);
bosko001 2:45b351b4fc2a 85
bosko001 2:45b351b4fc2a 86 // Converts an dxml structure back to xml. Returns a string of xml data that
bosko001 2:45b351b4fc2a 87 // must be freed.
bosko001 2:45b351b4fc2a 88 char *dxml_toxml(dxml_t xml);
bosko001 2:45b351b4fc2a 89
bosko001 2:45b351b4fc2a 90 // returns a NULL terminated array of processing instructions for the given
bosko001 2:45b351b4fc2a 91 // target
bosko001 2:45b351b4fc2a 92 const char **dxml_pi(dxml_t xml, const char *target);
bosko001 2:45b351b4fc2a 93
bosko001 2:45b351b4fc2a 94 // frees the memory allocated for an dxml structure
bosko001 2:45b351b4fc2a 95 void dxml_free(dxml_t xml);
bosko001 4:7abcf4543282 96
bosko001 2:45b351b4fc2a 97 // returns parser error message or empty string if none
bosko001 2:45b351b4fc2a 98 const char *dxml_error(dxml_t xml);
bosko001 2:45b351b4fc2a 99
bosko001 2:45b351b4fc2a 100 // returns a new empty dxml structure with the given root tag name
bosko001 2:45b351b4fc2a 101 dxml_t dxml_new(const char *name);
bosko001 2:45b351b4fc2a 102
bosko001 2:45b351b4fc2a 103 // wrapper for dxml_new() that strdup()s name
bosko001 2:45b351b4fc2a 104 #define dxml_new_d(name) dxml_set_flag(dxml_new(strdup(name)), dxml_NAMEM)
bosko001 2:45b351b4fc2a 105
bosko001 2:45b351b4fc2a 106 // Adds a child tag. off is the offset of the child tag relative to the start
bosko001 2:45b351b4fc2a 107 // of the parent tag's character content. Returns the child tag.
bosko001 2:45b351b4fc2a 108 dxml_t dxml_add_child(dxml_t xml, const char *name, size_t off);
bosko001 2:45b351b4fc2a 109
bosko001 2:45b351b4fc2a 110 // wrapper for dxml_add_child() that strdup()s name
bosko001 2:45b351b4fc2a 111 #define dxml_add_child_d(xml, name, off) \
bosko001 2:45b351b4fc2a 112 dxml_set_flag(dxml_add_child(xml, strdup(name), off), dxml_NAMEM)
bosko001 2:45b351b4fc2a 113
bosko001 2:45b351b4fc2a 114 // sets the character content for the given tag and returns the tag
bosko001 2:45b351b4fc2a 115 dxml_t dxml_set_txt(dxml_t xml, const char *txt);
bosko001 2:45b351b4fc2a 116
bosko001 2:45b351b4fc2a 117 // wrapper for dxml_set_txt() that strdup()s txt
bosko001 2:45b351b4fc2a 118 #define dxml_set_txt_d(xml, txt) \
bosko001 2:45b351b4fc2a 119 dxml_set_flag(dxml_set_txt(xml, strdup(txt)), dxml_TXTM)
bosko001 2:45b351b4fc2a 120
bosko001 2:45b351b4fc2a 121 // Sets the given tag attribute or adds a new attribute if not found. A value
bosko001 2:45b351b4fc2a 122 // of NULL will remove the specified attribute. Returns the tag given.
bosko001 2:45b351b4fc2a 123 dxml_t dxml_set_attr(dxml_t xml, const char *name, const char *value);
bosko001 2:45b351b4fc2a 124
bosko001 2:45b351b4fc2a 125 // Wrapper for dxml_set_attr() that strdup()s name/value. Value cannot be NULL
bosko001 2:45b351b4fc2a 126 #define dxml_set_attr_d(xml, name, value) \
bosko001 2:45b351b4fc2a 127 dxml_set_attr(dxml_set_flag(xml, dxml_DUP), strdup(name), strdup(value))
bosko001 2:45b351b4fc2a 128
bosko001 2:45b351b4fc2a 129 // sets a flag for the given tag and returns the tag
bosko001 2:45b351b4fc2a 130 dxml_t dxml_set_flag(dxml_t xml, short flag);
bosko001 2:45b351b4fc2a 131
bosko001 2:45b351b4fc2a 132 // removes a tag along with its subtags without freeing its memory
bosko001 2:45b351b4fc2a 133 dxml_t dxml_cut(dxml_t xml);
bosko001 2:45b351b4fc2a 134
bosko001 2:45b351b4fc2a 135 // inserts an existing tag into an dxml structure
bosko001 2:45b351b4fc2a 136 dxml_t dxml_insert(dxml_t xml, dxml_t dest, size_t off);
bosko001 2:45b351b4fc2a 137
bosko001 2:45b351b4fc2a 138 // Moves an existing tag to become a subtag of dest at the given offset from
bosko001 2:45b351b4fc2a 139 // the start of dest's character content. Returns the moved tag.
bosko001 2:45b351b4fc2a 140 #define dxml_move(xml, dest, off) dxml_insert(dxml_cut(xml), dest, off)
bosko001 2:45b351b4fc2a 141
bosko001 2:45b351b4fc2a 142 // removes a tag along with all its subtags
bosko001 2:45b351b4fc2a 143 #define dxml_remove(xml) dxml_free(dxml_cut(xml))
bosko001 2:45b351b4fc2a 144
bosko001 2:45b351b4fc2a 145 #ifdef __cplusplus
bosko001 2:45b351b4fc2a 146 }
bosko001 2:45b351b4fc2a 147 #endif
bosko001 2:45b351b4fc2a 148
bosko001 2:45b351b4fc2a 149 #endif // _dxml_H
bosko001 2:45b351b4fc2a 150
bosko001 4:7abcf4543282 151