168 lines
6.6 KiB
C
168 lines
6.6 KiB
C
/* ezxml.h
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*
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* Copyright 2004-2006 Aaron Voisine <aaron@voisine.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _EZXML_H
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#define _EZXML_H
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define EZXML_BUFSIZE 1024 // size of internal memory buffers
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#define EZXML_NAMEM 0x80 // name is malloced
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#define EZXML_TXTM 0x40 // txt is malloced
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#define EZXML_DUP 0x20 // attribute name and value are strduped
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typedef struct ezxml *ezxml_t;
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struct ezxml {
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char *name; // tag name
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char **attr; // tag attributes { name, value, name, value, ... NULL }
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char *txt; // tag character content, empty string if none
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size_t off; // tag offset from start of parent tag character content
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ezxml_t next; // next tag with same name in this section at this depth
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ezxml_t sibling; // next tag with different name in same section and depth
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ezxml_t ordered; // next tag, same section and depth, in original order
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ezxml_t child; // head of sub tag list, NULL if none
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ezxml_t parent; // parent tag, NULL if current tag is root tag
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short flags; // additional information
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};
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// Given a string of xml data and its length, parses it and creates an ezxml
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// structure. For efficiency, modifies the data by adding null terminators
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// and decoding ampersand sequences. If you don't want this, copy the data and
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// pass in the copy. Returns NULL on failure.
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ezxml_t ezxml_parse_str(char *s, size_t len);
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// A wrapper for ezxml_parse_str() that accepts a file descriptor. First
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// attempts to mem map the file. Failing that, reads the file into memory.
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// Returns NULL on failure.
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ezxml_t ezxml_parse_fd(int fd);
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// a wrapper for ezxml_parse_fd() that accepts a file name
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ezxml_t ezxml_parse_file(const char *file);
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// Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire
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// stream into memory and then parses it. For xml files, use ezxml_parse_file()
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// or ezxml_parse_fd()
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ezxml_t ezxml_parse_fp(FILE *fp);
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// returns the first child tag (one level deeper) with the given name or NULL
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// if not found
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ezxml_t ezxml_child(ezxml_t xml, const char *name);
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// returns the next tag of the same name in the same section and depth or NULL
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// if not found
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#define ezxml_next(xml) ((xml) ? xml->next : NULL)
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// Returns the Nth tag with the same name in the same section at the same depth
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// or NULL if not found. An index of 0 returns the tag given.
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ezxml_t ezxml_idx(ezxml_t xml, int idx);
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// returns the name of the given tag
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#define ezxml_name(xml) ((xml) ? xml->name : NULL)
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// returns the given tag's character content or empty string if none
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#define ezxml_txt(xml) ((xml) ? xml->txt : "")
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// returns the value of the requested tag attribute, or NULL if not found
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const char *ezxml_attr(ezxml_t xml, const char *attr);
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// Traverses the ezxml sturcture to retrieve a specific subtag. Takes a
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// variable length list of tag names and indexes. The argument list must be
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// terminated by either an index of -1 or an empty string tag name. Example:
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// title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1);
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// This retrieves the title of the 3rd book on the 1st shelf of library.
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// Returns NULL if not found.
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ezxml_t ezxml_get(ezxml_t xml, ...);
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// Converts an ezxml structure back to xml. Returns a string of xml data that
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// must be freed.
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char *ezxml_toxml(ezxml_t xml);
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// returns a NULL terminated array of processing instructions for the given
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// target
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const char **ezxml_pi(ezxml_t xml, const char *target);
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// frees the memory allocated for an ezxml structure
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void ezxml_free(ezxml_t xml);
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// returns parser error message or empty string if none
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const char *ezxml_error(ezxml_t xml);
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// returns a new empty ezxml structure with the given root tag name
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ezxml_t ezxml_new(const char *name);
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// wrapper for ezxml_new() that strdup()s name
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#define ezxml_new_d(name) ezxml_set_flag(ezxml_new(strdup(name)), EZXML_NAMEM)
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// Adds a child tag. off is the offset of the child tag relative to the start
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// of the parent tag's character content. Returns the child tag.
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ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off);
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// wrapper for ezxml_add_child() that strdup()s name
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#define ezxml_add_child_d(xml, name, off) \
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ezxml_set_flag(ezxml_add_child(xml, strdup(name), off), EZXML_NAMEM)
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// sets the character content for the given tag and returns the tag
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ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt);
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// wrapper for ezxml_set_txt() that strdup()s txt
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#define ezxml_set_txt_d(xml, txt) \
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ezxml_set_flag(ezxml_set_txt(xml, strdup(txt)), EZXML_TXTM)
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// Sets the given tag attribute or adds a new attribute if not found. A value
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// of NULL will remove the specified attribute. Returns the tag given.
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ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value);
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// Wrapper for ezxml_set_attr() that strdup()s name/value. Value cannot be NULL
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#define ezxml_set_attr_d(xml, name, value) \
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ezxml_set_attr(ezxml_set_flag(xml, EZXML_DUP), strdup(name), strdup(value))
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// sets a flag for the given tag and returns the tag
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ezxml_t ezxml_set_flag(ezxml_t xml, short flag);
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// removes a tag along with its subtags without freeing its memory
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ezxml_t ezxml_cut(ezxml_t xml);
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// inserts an existing tag into an ezxml structure
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ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off);
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// Moves an existing tag to become a subtag of dest at the given offset from
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// the start of dest's character content. Returns the moved tag.
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#define ezxml_move(xml, dest, off) ezxml_insert(ezxml_cut(xml), dest, off)
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// removes a tag along with all its subtags
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#define ezxml_remove(xml) ezxml_free(ezxml_cut(xml))
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#ifdef __cplusplus
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}
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#endif
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#endif // _EZXML_H
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