tree.c.svn-base

这是一个用于解析xml文件的类库。使用这个类库

    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
	return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if ((!IS_LETTER(c)) && (c != '_') && (c != ':'))
	return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') || (c == ':') ||
	   (c == '-') || (c == '_') || IS_COMBINING(c) || IS_EXTENDER(c)) {
	cur += l;
	c = CUR_SCHAR(cur, l);
    }
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if (c != 0)
	return(1);
    return(0);
}

/**
 * xmlValidateNMToken:
 * @value: the value to check
 * @space: allow spaces in front and end of the string
 *
 * Check that a value conforms to the lexical space of NMToken
 *
 * Returns 0 if this validates, a positive error code number otherwise
 *         and -1 in case of internal or API error.
 */
int
xmlValidateNMToken(const xmlChar *value, int space) {
    const xmlChar *cur = value;
    int c,l;

    /*
     * First quick algorithm for ASCII range
     */
    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (((*cur >= 'a') && (*cur <= 'z')) ||
        ((*cur >= 'A') && (*cur <= 'Z')) ||
        ((*cur >= '0') && (*cur <= '9')) ||
        (*cur == '_') || (*cur == '-') || (*cur == '.') || (*cur == ':'))
	cur++;
    else
	goto try_complex;
    while (((*cur >= 'a') && (*cur <= 'z')) ||
	   ((*cur >= 'A') && (*cur <= 'Z')) ||
	   ((*cur >= '0') && (*cur <= '9')) ||
	   (*cur == '_') || (*cur == '-') || (*cur == '.') || (*cur == ':'))
	cur++;
    if (space)
	while (IS_BLANK_CH(*cur)) cur++;
    if (*cur == 0)
	return(0);

try_complex:
    /*
     * Second check for chars outside the ASCII range
     */
    cur = value;
    c = CUR_SCHAR(cur, l);
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if (!(IS_LETTER(c) || IS_DIGIT(c) || (c == '.') || (c == ':') ||
        (c == '-') || (c == '_') || IS_COMBINING(c) || IS_EXTENDER(c)))
	return(1);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (IS_LETTER(c) || IS_DIGIT(c) || (c == '.') || (c == ':') ||
	   (c == '-') || (c == '_') || IS_COMBINING(c) || IS_EXTENDER(c)) {
	cur += l;
	c = CUR_SCHAR(cur, l);
    }
    if (space) {
	while (IS_BLANK(c)) {
	    cur += l;
	    c = CUR_SCHAR(cur, l);
	}
    }
    if (c != 0)
	return(1);
    return(0);
}
#endif /* LIBXML_TREE_ENABLED */

/************************************************************************
 *									*
 *		Allocation and deallocation of basic structures		*
 *									*
 ************************************************************************/
 
/**
 * xmlSetBufferAllocationScheme:
 * @scheme:  allocation method to use
 * 
 * Set the buffer allocation method.  Types are
 * XML_BUFFER_ALLOC_EXACT - use exact sizes, keeps memory usage down
 * XML_BUFFER_ALLOC_DOUBLEIT - double buffer when extra needed, 
 *                             improves performance
 */
void
xmlSetBufferAllocationScheme(xmlBufferAllocationScheme scheme) {
    xmlBufferAllocScheme = scheme;
}

/**
 * xmlGetBufferAllocationScheme:
 *
 * Types are
 * XML_BUFFER_ALLOC_EXACT - use exact sizes, keeps memory usage down
 * XML_BUFFER_ALLOC_DOUBLEIT - double buffer when extra needed, 
 *                             improves performance
 * 
 * Returns the current allocation scheme
 */
xmlBufferAllocationScheme
xmlGetBufferAllocationScheme(void) {
    return(xmlBufferAllocScheme);
}

/**
 * xmlNewNs:
 * @node:  the element carrying the namespace
 * @href:  the URI associated
 * @prefix:  the prefix for the namespace
 *
 * Creation of a new Namespace. This function will refuse to create
 * a namespace with a similar prefix than an existing one present on this
 * node.
 * We use href==NULL in the case of an element creation where the namespace
 * was not defined.
 * Returns a new namespace pointer or NULL
 */
xmlNsPtr
xmlNewNs(xmlNodePtr node, const xmlChar *href, const xmlChar *prefix) {
    xmlNsPtr cur;

    if ((node != NULL) && (node->type != XML_ELEMENT_NODE))
	return(NULL);

    if ((prefix != NULL) && (xmlStrEqual(prefix, BAD_CAST "xml")))
	return(NULL);

    /*
     * Allocate a new Namespace and fill the fields.
     */
    cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
    if (cur == NULL) {
	xmlTreeErrMemory("building namespace");
	return(NULL);
    }
    memset(cur, 0, sizeof(xmlNs));
    cur->type = XML_LOCAL_NAMESPACE;

    if (href != NULL)
	cur->href = xmlStrdup(href); 
    if (prefix != NULL)
	cur->prefix = xmlStrdup(prefix); 

    /*
     * Add it at the end to preserve parsing order ...
     * and checks for existing use of the prefix
     */
    if (node != NULL) {
	if (node->nsDef == NULL) {
	    node->nsDef = cur;
	} else {
	    xmlNsPtr prev = node->nsDef;

	    if (((prev->prefix == NULL) && (cur->prefix == NULL)) ||
		(xmlStrEqual(prev->prefix, cur->prefix))) {
		xmlFreeNs(cur);
		return(NULL);
	    }    
	    while (prev->next != NULL) {
	        prev = prev->next;
		if (((prev->prefix == NULL) && (cur->prefix == NULL)) ||
		    (xmlStrEqual(prev->prefix, cur->prefix))) {
		    xmlFreeNs(cur);
		    return(NULL);
		}    
	    }
	    prev->next = cur;
	}
    }
    return(cur);
}

/**
 * xmlSetNs:
 * @node:  a node in the document
 * @ns:  a namespace pointer
 *
 * Associate a namespace to a node, a posteriori.
 */
void
xmlSetNs(xmlNodePtr node, xmlNsPtr ns) {
    if (node == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
		"xmlSetNs: node == NULL\n");
#endif
	return;
    }
    node->ns = ns;
}

/**
 * xmlFreeNs:
 * @cur:  the namespace pointer
 *
 * Free up the structures associated to a namespace
 */
void
xmlFreeNs(xmlNsPtr cur) {
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
		"xmlFreeNs : ns == NULL\n");
#endif
	return;
    }
    if (cur->href != NULL) xmlFree((char *) cur->href);
    if (cur->prefix != NULL) xmlFree((char *) cur->prefix);
    xmlFree(cur);
}

/**
 * xmlFreeNsList:
 * @cur:  the first namespace pointer
 *
 * Free up all the structures associated to the chained namespaces.
 */
void
xmlFreeNsList(xmlNsPtr cur) {
    xmlNsPtr next;
    if (cur == NULL) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
		"xmlFreeNsList : ns == NULL\n");
#endif
	return;
    }
    while (cur != NULL) {
        next = cur->next;
        xmlFreeNs(cur);
	cur = next;
    }
}

/**
 * xmlNewDtd:
 * @doc:  the document pointer
 * @name:  the DTD name
 * @ExternalID:  the external ID
 * @SystemID:  the system ID
 *
 * Creation of a new DTD for the external subset. To create an
 * internal subset, use xmlCreateIntSubset().
 *
 * Returns a pointer to the new DTD structure
 */
xmlDtdPtr
xmlNewDtd(xmlDocPtr doc, const xmlChar *name,
                    const xmlChar *ExternalID, const xmlChar *SystemID) {
    xmlDtdPtr cur;

    if ((doc != NULL) && (doc->extSubset != NULL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,
		"xmlNewDtd(%s): document %s already have a DTD %s\n",
	    /* !!! */ (char *) name, doc->name,
	    /* !!! */ (char *)doc->extSubset->name);
#endif
	return(NULL);
    }

    /*
     * Allocate a new DTD and fill the fields.
     */
    cur = (xmlDtdPtr) xmlMalloc(sizeof(xmlDtd));
    if (cur == NULL) {
	xmlTreeErrMemory("building DTD");
	return(NULL);
    }
    memset(cur, 0 , sizeof(xmlDtd));
    cur->type = XML_DTD_NODE;

    if (name != NULL)
	cur->name = xmlStrdup(name); 
    if (ExternalID != NULL)
	cur->ExternalID = xmlStrdup(ExternalID); 
    if (SystemID != NULL)
	cur->SystemID = xmlStrdup(SystemID); 
    if (doc != NULL)
	doc->extSubset = cur;
    cur->doc = doc;

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
	xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * xmlGetIntSubset:
 * @doc:  the document pointer
 *
 * Get the internal subset of a document
 * Returns a pointer to the DTD structure or NULL if not found
 */

xmlDtdPtr
xmlGetIntSubset(xmlDocPtr doc) {
    xmlNodePtr cur;

    if (doc == NULL)
	return(NULL);
    cur = doc->children;
    while (cur != NULL) {
	if (cur->type == XML_DTD_NODE)
	    return((xmlDtdPtr) cur);
	cur = cur->next;
    }
    return((xmlDtdPtr) doc->intSubset);
}

/**
 * xmlCreateIntSubset:
 * @doc:  the document pointer
 * @name:  the DTD name
 * @ExternalID:  the external (PUBLIC) ID
 * @SystemID:  the system ID
 *
 * Create the internal subset of a document
 * Returns a pointer to the new DTD structure
 */
xmlDtdPtr
xmlCreateIntSubset(xmlDocPtr doc, const xmlChar *name,
                   const xmlChar *ExternalID, const xmlChar *SystemID) {
    xmlDtdPtr cur;

    if ((doc != NULL) && (xmlGetIntSubset(doc) != NULL)) {
#ifdef DEBUG_TREE
        xmlGenericError(xmlGenericErrorContext,

     "xmlCreateIntSubset(): document %s already have an internal subset\n",
	    doc->name);
#endif
	return(NULL);
    }

    /*
     * Allocate a new DTD and fill the fields.
     */
    cur = (xmlDtdPtr) xmlMalloc(sizeof(xmlDtd));
    if (cur == NULL) {
	xmlTreeErrMemory("building internal subset");
	return(NULL);
    }
    memset(cur, 0, sizeof(xmlDtd));
    cur->type = XML_DTD_NODE;

    if (name != NULL)
	cur->name = xmlStrdup(name); 
    if (ExternalID != NULL)
	cur->ExternalID = xmlStrdup(ExternalID); 
    if (SystemID != NULL)
	cur->SystemID = xmlStrdup(SystemID); 
    if (doc != NULL) {
	doc->intSubset = cur;
	cur->parent = doc;
	cur->doc = doc;
	if (doc->children == NULL) {
	    doc->children = (xmlNodePtr) cur;
	    doc->last = (xmlNodePtr) cur;
	} else {
	    if (doc->type == XML_HTML_DOCUMENT_NODE) {
		xmlNodePtr prev;

		prev = doc->children;
		prev->prev = (xmlNodePtr) cur;
		cur->next = prev;
		doc->children = (xmlNodePtr) cur;
	    } else {
		xmlNodePtr next;

		next = doc->children;
		while ((next != NULL) && (next->type != XML_ELEMENT_NODE))
		    next = next->next;
		if (next == NULL) {
		    cur->prev = doc->last;
		    cur->prev->next = (xmlNodePtr) cur;
		    cur->next = NULL;
		    doc->last = (xmlNodePtr) cur;
		} else {
		    cur->next = next;
		    cur->prev = next->prev;
		    if (cur->prev == NULL)
			doc->children = (xmlNodePtr) cur;
		    else
			cur->prev->next = (xmlNodePtr) cur;
		    next->prev = (xmlNodePtr) cur;
		}
	    }
	}
    }

    if ((__xmlRegisterCallbacks) && (xmlRegisterNodeDefaultValue))
	xmlRegisterNodeDefaultValue((xmlNodePtr)cur);
    return(cur);
}

/**
 * DICT_FREE:
 * @str:  a string
 *
 * Free a string if it is not owned by the "dict" dictionnary in the
 * current scope
 */
#define DICT_FREE(str)						\
	if ((str) && ((!dict) || 				\
	    (xmlDictOwns(dict, (const xmlChar *)(str)) == 0)))	\
	    xmlFree((char *)(str));

/**
 * xmlFreeDtd:
 * @cur:  the DTD structure to free up
 *
 * Free a DTD structure.
 */
void
xmlFreeDtd(xmlDtdPtr cur) {
    xmlDictPtr dict = NULL;

    if (cur == NULL) {
	return;
    }
    if (cur->doc != NULL) dict = cur->doc->dict;

    if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
	xmlDeregisterNodeDefaultValue((xmlNodePtr)cur);

    if (cur->children != NULL) {
	xmlNodePtr next, c = cur->children;

	/*
	 * Cleanup all the DTD comments they are not in the DTD
	 * indexes.
	 */
        while (c != NULL) {
	    next = c->next;
	    if ((c->type == XML_COMMENT_NODE) || (c->type == XML_PI_NODE)) {
		xmlUnlinkNode(c);
		xmlFreeNode(c);
	    }
	    c = next;
	}
    }
    DICT_FREE(cur->name)
    DICT_FREE(cur->SystemID)
    DICT_FREE(cur->ExternalID)
    /* TODO !!! */
    if (cur->notations != NULL)
        xmlFreeNotationTable((xmlNotationTablePtr) cur->notations);
    
    if (cur->elements != NULL)
        xmlFreeElementTable((xmlElementTablePtr) cur->elements);
    if (cur->attributes != NULL)
        xmlFreeAttributeTable((xmlAttributeTablePtr) cur->attributes);
    if (cur->entities != NULL)
        xmlFreeEntitiesTable((xmlEntitiesTablePtr) cur->entities);
    if (cur->pentities != NULL)
        xmlFreeEntitiesTable((xmlEntitiesTablePtr) cur->pentities);

    xmlFree(cur);
}

/**
 * xmlNewDoc:
 * @version:  xmlChar string giving the version of XML "1.0"
 *
 * Creates a new XML document
 *
 * Returns a new document
 */
xmlDocPtr
xmlNewDoc(const xmlChar *version) {
    xmlDocPtr cur;

    if (version == NULL)
	version = (const xmlChar *) "1.0";

    /*
     * Allocate a new document and fill the fields.
     */
    cur = (xmlDocPtr) xmlMalloc(sizeof(xmlDoc));
    if (cur == NULL) {
	xmlTreeErrMemory("building doc");
	return(NULL);
    }
    memset(cur, 0, sizeof(xmlDoc));
    cur->type = XML_DOCUMENT_NODE;

    cur->version = xmlStrdup(version); 
    cur->standalone = -1;
    cur->compression = -1; /* not initialized */