src/common/ezxml.h

/* RCSid $Id: ezxml.h,v 2.2 2008/06/05 21:34:34 greg Exp $ */
/* ezxml.h
 *
 * Copyright 2004-2006 Aaron Voisine <[email protected]>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef _EZXML_H
#define _EZXML_H

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <fcntl.h>

#ifdef __cplusplus
extern "C" {
#endif

/* disable MMAP on CYGWIN, seems to cause problems... */
#ifdef CYGWIN
#define EZXML_NOMMAP
#endif

#define EZXML_BUFSIZE 1024 // size of internal memory buffers
#define EZXML_NAMEM   0x80 // name is malloced
#define EZXML_TXTM    0x40 // txt is malloced
#define EZXML_DUP     0x20 // attribute name and value are strduped

typedef struct ezxml *ezxml_t;
struct ezxml {
    char *name;      // tag name
    char **attr;     // tag attributes { name, value, name, value, ... NULL }
    char *txt;       // tag character content, empty string if none
    size_t off;      // tag offset from start of parent tag character content
    ezxml_t next;    // next tag with same name in this section at this depth
    ezxml_t sibling; // next tag with different name in same section and depth
    ezxml_t ordered; // next tag, same section and depth, in original order
    ezxml_t child;   // head of sub tag list, NULL if none
    ezxml_t parent;  // parent tag, NULL if current tag is root tag
    short flags;     // additional information
};

// Given a string of xml data and its length, parses it and creates an ezxml
// structure. For efficiency, modifies the data by adding null terminators
// and decoding ampersand sequences. If you don't want this, copy the data and
// pass in the copy. Returns NULL on failure.
ezxml_t ezxml_parse_str(char *s, size_t len);

// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
// attempts to mem map the file. Failing that, reads the file into memory.
// Returns NULL on failure.
ezxml_t ezxml_parse_fd(int fd);

// a wrapper for ezxml_parse_fd() that accepts a file name
ezxml_t ezxml_parse_file(const char *file);
    
// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
// stream into memory and then parses it. For xml files, use ezxml_parse_file()
// or ezxml_parse_fd()
ezxml_t ezxml_parse_fp(FILE *fp);

// returns the first child tag (one level deeper) with the given name or NULL
// if not found
ezxml_t ezxml_child(ezxml_t xml, const char *name);

// returns the next tag of the same name in the same section and depth or NULL
// if not found
#define ezxml_next(xml) ((xml) ? xml->next : NULL)

// Returns the Nth tag with the same name in the same section at the same depth
// or NULL if not found. An index of 0 returns the tag given.
ezxml_t ezxml_idx(ezxml_t xml, int idx);

// returns the name of the given tag
#define ezxml_name(xml) ((xml) ? xml->name : NULL)

// returns the given tag's character content or empty string if none
#define ezxml_txt(xml) ((xml) ? xml->txt : "")

// returns the value of the requested tag attribute, or NULL if not found
const char *ezxml_attr(ezxml_t xml, const char *attr);

// Traverses the ezxml sturcture to retrieve a specific subtag. Takes a
// variable length list of tag names and indexes. The argument list must be
// terminated by either an index of -1 or an empty string tag name. Example: 
// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
// This retrieves the title of the 3rd book on the 1st shelf of library.
// Returns NULL if not found.
ezxml_t ezxml_get(ezxml_t xml, ...);

// Converts an ezxml structure back to xml. Returns a string of xml data that
// must be freed.
char *ezxml_toxml(ezxml_t xml);

// returns a NULL terminated array of processing instructions for the given
// target
const char **ezxml_pi(ezxml_t xml, const char *target);

// frees the memory allocated for an ezxml structure
void ezxml_free(ezxml_t xml);
    
// returns parser error message or empty string if none
const char *ezxml_error(ezxml_t xml);

// returns a new empty ezxml structure with the given root tag name
ezxml_t ezxml_new(const char *name);

// wrapper for ezxml_new() that strdup()s name
#define ezxml_new_d(name) ezxml_set_flag(ezxml_new(strdup(name)), EZXML_NAMEM)

// Adds a child tag. off is the offset of the child tag relative to the start
// of the parent tag's character content. Returns the child tag.
ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off);

// wrapper for ezxml_add_child() that strdup()s name
#define ezxml_add_child_d(xml, name, off) \
    ezxml_set_flag(ezxml_add_child(xml, strdup(name), off), EZXML_NAMEM)

// sets the character content for the given tag and returns the tag
ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt);

// wrapper for ezxml_set_txt() that strdup()s txt
#define ezxml_set_txt_d(xml, txt) \
    ezxml_set_flag(ezxml_set_txt(xml, strdup(txt)), EZXML_TXTM)

// Sets the given tag attribute or adds a new attribute if not found. A value
// of NULL will remove the specified attribute. Returns the tag given.
ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value);

// Wrapper for ezxml_set_attr() that strdup()s name/value. Value cannot be NULL
#define ezxml_set_attr_d(xml, name, value) \
    ezxml_set_attr(ezxml_set_flag(xml, EZXML_DUP), strdup(name), strdup(value))

// sets a flag for the given tag and returns the tag
ezxml_t ezxml_set_flag(ezxml_t xml, short flag);

// removes a tag along with its subtags without freeing its memory
ezxml_t ezxml_cut(ezxml_t xml);

// inserts an existing tag into an ezxml structure
ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off);

// Moves an existing tag to become a subtag of dest at the given offset from
// the start of dest's character content. Returns the moved tag.
#define ezxml_move(xml, dest, off) ezxml_insert(ezxml_cut(xml), dest, off)

// removes a tag along with all its subtags
#define ezxml_remove(xml) ezxml_free(ezxml_cut(xml))

#ifdef __cplusplus
}
#endif

#endif // _EZXML_H
Revision:	2.1
Committed:	Wed Jun 17 20:41:47 2009 UTC (14 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R0
Log Message:	Created dctimestep utility for daylight coefficient calculations
#	User	Rev	Content
1	greg	2.1	/* RCSid $Id: ezxml.h,v 2.2 2008/06/05 21:34:34 greg Exp $ */
2			/* ezxml.h
3			*
4			* Copyright 2004-2006 Aaron Voisine <[email protected]>
5			*
6			* Permission is hereby granted, free of charge, to any person obtaining
7			* a copy of this software and associated documentation files (the
8			* "Software"), to deal in the Software without restriction, including
9			* without limitation the rights to use, copy, modify, merge, publish,
10			* distribute, sublicense, and/or sell copies of the Software, and to
11			* permit persons to whom the Software is furnished to do so, subject to
12			* the following conditions:
13			*
14			* The above copyright notice and this permission notice shall be included
15			* in all copies or substantial portions of the Software.
16			*
17			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18			* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20			* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
21			* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22			* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23			* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24			*/
25
26			#ifndef _EZXML_H
27			#define _EZXML_H
28
29			#include <stdlib.h>
30			#include <stdio.h>
31			#include <stdarg.h>
32			#include <fcntl.h>
33
34			#ifdef __cplusplus
35			extern "C" {
36			#endif
37
38			/* disable MMAP on CYGWIN, seems to cause problems... */
39			#ifdef CYGWIN
40			#define EZXML_NOMMAP
41			#endif
42
43			#define EZXML_BUFSIZE 1024 // size of internal memory buffers
44			#define EZXML_NAMEM 0x80 // name is malloced
45			#define EZXML_TXTM 0x40 // txt is malloced
46			#define EZXML_DUP 0x20 // attribute name and value are strduped
47
48			typedef struct ezxml *ezxml_t;
49			struct ezxml {
50			char *name; // tag name
51			char **attr; // tag attributes { name, value, name, value, ... NULL }
52			char *txt; // tag character content, empty string if none
53			size_t off; // tag offset from start of parent tag character content
54			ezxml_t next; // next tag with same name in this section at this depth
55			ezxml_t sibling; // next tag with different name in same section and depth
56			ezxml_t ordered; // next tag, same section and depth, in original order
57			ezxml_t child; // head of sub tag list, NULL if none
58			ezxml_t parent; // parent tag, NULL if current tag is root tag
59			short flags; // additional information
60			};
61
62			// Given a string of xml data and its length, parses it and creates an ezxml
63			// structure. For efficiency, modifies the data by adding null terminators
64			// and decoding ampersand sequences. If you don't want this, copy the data and
65			// pass in the copy. Returns NULL on failure.
66			ezxml_t ezxml_parse_str(char *s, size_t len);
67
68			// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
69			// attempts to mem map the file. Failing that, reads the file into memory.
70			// Returns NULL on failure.
71			ezxml_t ezxml_parse_fd(int fd);
72
73			// a wrapper for ezxml_parse_fd() that accepts a file name
74			ezxml_t ezxml_parse_file(const char *file);
75
76			// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
77			// stream into memory and then parses it. For xml files, use ezxml_parse_file()
78			// or ezxml_parse_fd()
79			ezxml_t ezxml_parse_fp(FILE *fp);
80
81			// returns the first child tag (one level deeper) with the given name or NULL
82			// if not found
83			ezxml_t ezxml_child(ezxml_t xml, const char *name);
84
85			// returns the next tag of the same name in the same section and depth or NULL
86			// if not found
87			#define ezxml_next(xml) ((xml) ? xml->next : NULL)
88
89			// Returns the Nth tag with the same name in the same section at the same depth
90			// or NULL if not found. An index of 0 returns the tag given.
91			ezxml_t ezxml_idx(ezxml_t xml, int idx);
92
93			// returns the name of the given tag
94			#define ezxml_name(xml) ((xml) ? xml->name : NULL)
95
96			// returns the given tag's character content or empty string if none
97			#define ezxml_txt(xml) ((xml) ? xml->txt : "")
98
99			// returns the value of the requested tag attribute, or NULL if not found
100			const char ezxml_attr(ezxml_t xml, const char attr);
101
102			// Traverses the ezxml sturcture to retrieve a specific subtag. Takes a
103			// variable length list of tag names and indexes. The argument list must be
104			// terminated by either an index of -1 or an empty string tag name. Example:
105			// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
106			// This retrieves the title of the 3rd book on the 1st shelf of library.
107			// Returns NULL if not found.
108			ezxml_t ezxml_get(ezxml_t xml, ...);
109
110			// Converts an ezxml structure back to xml. Returns a string of xml data that
111			// must be freed.
112			char *ezxml_toxml(ezxml_t xml);
113
114			// returns a NULL terminated array of processing instructions for the given
115			// target
116			const char *ezxml_pi(ezxml_t xml, const char target);
117
118			// frees the memory allocated for an ezxml structure
119			void ezxml_free(ezxml_t xml);
120
121			// returns parser error message or empty string if none
122			const char *ezxml_error(ezxml_t xml);
123
124			// returns a new empty ezxml structure with the given root tag name
125			ezxml_t ezxml_new(const char *name);
126
127			// wrapper for ezxml_new() that strdup()s name
128			#define ezxml_new_d(name) ezxml_set_flag(ezxml_new(strdup(name)), EZXML_NAMEM)
129
130			// Adds a child tag. off is the offset of the child tag relative to the start
131			// of the parent tag's character content. Returns the child tag.
132			ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off);
133
134			// wrapper for ezxml_add_child() that strdup()s name
135			#define ezxml_add_child_d(xml, name, off) \
136			ezxml_set_flag(ezxml_add_child(xml, strdup(name), off), EZXML_NAMEM)
137
138			// sets the character content for the given tag and returns the tag
139			ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt);
140
141			// wrapper for ezxml_set_txt() that strdup()s txt
142			#define ezxml_set_txt_d(xml, txt) \
143			ezxml_set_flag(ezxml_set_txt(xml, strdup(txt)), EZXML_TXTM)
144
145			// Sets the given tag attribute or adds a new attribute if not found. A value
146			// of NULL will remove the specified attribute. Returns the tag given.
147			ezxml_t ezxml_set_attr(ezxml_t xml, const char name, const char value);
148
149			// Wrapper for ezxml_set_attr() that strdup()s name/value. Value cannot be NULL
150			#define ezxml_set_attr_d(xml, name, value) \
151			ezxml_set_attr(ezxml_set_flag(xml, EZXML_DUP), strdup(name), strdup(value))
152
153			// sets a flag for the given tag and returns the tag
154			ezxml_t ezxml_set_flag(ezxml_t xml, short flag);
155
156			// removes a tag along with its subtags without freeing its memory
157			ezxml_t ezxml_cut(ezxml_t xml);
158
159			// inserts an existing tag into an ezxml structure
160			ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off);
161
162			// Moves an existing tag to become a subtag of dest at the given offset from
163			// the start of dest's character content. Returns the moved tag.
164			#define ezxml_move(xml, dest, off) ezxml_insert(ezxml_cut(xml), dest, off)
165
166			// removes a tag along with all its subtags
167			#define ezxml_remove(xml) ezxml_free(ezxml_cut(xml))
168
169			#ifdef __cplusplus
170			}
171			#endif
172
173			#endif // _EZXML_H