pattern

pattern - pattern expression handling

allows to compile and test pattern expressions for nodes either in a tree or based on a parser state.

Author(s): Daniel Veillard

Synopsis

typedef xmlStreamCtxt * xmlStreamCtxtPtr;
typedef enum xmlPatternFlags;
typedef struct _xmlStreamCtxt xmlStreamCtxt;
typedef struct _xmlPattern xmlPattern;
typedef xmlPattern * xmlPatternPtr;
int	xmlPatternMinDepth		(xmlPatternPtr comp);
xmlStreamCtxtPtr	xmlPatternGetStreamCtxt	(xmlPatternPtr comp);
int	xmlPatternFromRoot		(xmlPatternPtr comp);
void	xmlFreePatternList		(xmlPatternPtr comp);
int	xmlPatternStreamable		(xmlPatternPtr comp);
int	xmlStreamPushAttr		(xmlStreamCtxtPtr stream, 
const xmlChar * name,
const xmlChar * ns); int xmlPatternMatch (xmlPatternPtr comp,
xmlNodePtr node); int xmlStreamWantsAnyNode (xmlStreamCtxtPtr streamCtxt); int xmlStreamPop (xmlStreamCtxtPtr stream); void xmlFreePattern (xmlPatternPtr comp); int xmlStreamPush (xmlStreamCtxtPtr stream,
const xmlChar * name,
const xmlChar * ns); int xmlPatternMaxDepth (xmlPatternPtr comp); xmlPatternPtr xmlPatterncompile (const xmlChar * pattern,
xmlDict * dict,
int flags,
const xmlChar ** namespaces); int xmlStreamPushNode (xmlStreamCtxtPtr stream,
const xmlChar * name,
const xmlChar * ns,
int nodeType); void xmlFreeStreamCtxt (xmlStreamCtxtPtr stream);

Description

Details

Structure xmlPattern

struct _xmlPattern {
The content of this structure is not made public by the API.
} xmlPattern;


Enum xmlPatternFlags

enum xmlPatternFlags {
    XML_PATTERN_DEFAULT = 0 /* simple pattern match */
    XML_PATTERN_XPATH = 1 /* standard XPath pattern */
    XML_PATTERN_XSSEL = 2 /* XPath subset for schema selector */
    XML_PATTERN_XSFIELD = 4 /*  XPath subset for schema field */
};


Typedef xmlPatternPtr

xmlPattern * xmlPatternPtr;


Structure xmlStreamCtxt

struct _xmlStreamCtxt {
The content of this structure is not made public by the API.
} xmlStreamCtxt;


Typedef xmlStreamCtxtPtr

xmlStreamCtxt * xmlStreamCtxtPtr;


xmlFreePattern ()

void	xmlFreePattern			(xmlPatternPtr comp)

Free up the memory allocated by @comp

comp:an XSLT comp

xmlFreePatternList ()

void	xmlFreePatternList		(xmlPatternPtr comp)

Free up the memory allocated by all the elements of @comp

comp:an XSLT comp list

xmlFreeStreamCtxt ()

void	xmlFreeStreamCtxt		(xmlStreamCtxtPtr stream)

Free the stream context

stream:the stream context

xmlPatternFromRoot ()

int	xmlPatternFromRoot		(xmlPatternPtr comp)

Check if the pattern must be looked at from the root.

comp:the precompiled pattern
Returns:1 if true, 0 if false and -1 in case of error

xmlPatternGetStreamCtxt ()

xmlStreamCtxtPtr	xmlPatternGetStreamCtxt	(xmlPatternPtr comp)

Get a streaming context for that pattern Use xmlFreeStreamCtxt to free the context.

comp:the precompiled pattern
Returns:a pointer to the context or NULL in case of failure

xmlPatternMatch ()

int	xmlPatternMatch			(xmlPatternPtr comp, 
xmlNodePtr node)

Test whether the node matches the pattern

comp:the precompiled pattern
node:a node
Returns:1 if it matches, 0 if it doesn't and -1 in case of failure

xmlPatternMaxDepth ()

int	xmlPatternMaxDepth		(xmlPatternPtr comp)

Check the maximum depth reachable by a pattern

comp:the precompiled pattern
Returns:-2 if no limit (using //), otherwise the depth, and -1 in case of error

xmlPatternMinDepth ()

int	xmlPatternMinDepth		(xmlPatternPtr comp)

Check the minimum depth reachable by a pattern, 0 mean the / or . are part of the set.

comp:the precompiled pattern
Returns:-1 in case of error otherwise the depth,

xmlPatternStreamable ()

int	xmlPatternStreamable		(xmlPatternPtr comp)

Check if the pattern is streamable i.e. xmlPatternGetStreamCtxt() should work.

comp:the precompiled pattern
Returns:1 if streamable, 0 if not and -1 in case of error.

xmlPatterncompile ()

xmlPatternPtr	xmlPatterncompile	(const xmlChar * pattern, 
xmlDict * dict,
int flags,
const xmlChar ** namespaces)

Compile a pattern.

pattern:the pattern to compile
dict:an optional dictionary for interned strings
flags:compilation flags, see xmlPatternFlags
namespaces:the prefix definitions, array of [URI, prefix] or NULL
Returns:the compiled form of the pattern or NULL in case of error

xmlStreamPop ()

int	xmlStreamPop			(xmlStreamCtxtPtr stream)

push one level from the stream.

stream:the stream context
Returns:-1 in case of error, 0 otherwise.

xmlStreamPush ()

int	xmlStreamPush			(xmlStreamCtxtPtr stream, 
const xmlChar * name,
const xmlChar * ns)

Push new data onto the stream. NOTE: if the call xmlPatterncompile() indicated a dictionary, then strings for name and ns will be expected to come from the dictionary. Both @name and @ns being NULL means the / i.e. the root of the document. This can also act as a reset. Otherwise the function will act as if it has been given an element-node.

stream:the stream context
name:the current name
ns:the namespace name
Returns:-1 in case of error, 1 if the current state in the stream is a match and 0 otherwise.

xmlStreamPushAttr ()

int	xmlStreamPushAttr		(xmlStreamCtxtPtr stream, 
const xmlChar * name,
const xmlChar * ns)

Push new attribute data onto the stream. NOTE: if the call xmlPatterncompile() indicated a dictionary, then strings for name and ns will be expected to come from the dictionary. Both @name and @ns being NULL means the / i.e. the root of the document. This can also act as a reset. Otherwise the function will act as if it has been given an attribute-node.

stream:the stream context
name:the current name
ns:the namespace name
Returns:-1 in case of error, 1 if the current state in the stream is a match and 0 otherwise.

xmlStreamPushNode ()

int	xmlStreamPushNode		(xmlStreamCtxtPtr stream, 
const xmlChar * name,
const xmlChar * ns,
int nodeType)

Push new data onto the stream. NOTE: if the call xmlPatterncompile() indicated a dictionary, then strings for name and ns will be expected to come from the dictionary. Both @name and @ns being NULL means the / i.e. the root of the document. This can also act as a reset. Different from xmlStreamPush() this function can be fed with nodes of type: element-, attribute-, text-, cdata-section-, comment- and processing-instruction-node.

stream:the stream context
name:the current name
ns:the namespace name
nodeType:the type of the node being pushed
Returns:-1 in case of error, 1 if the current state in the stream is a match and 0 otherwise.

xmlStreamWantsAnyNode ()

int	xmlStreamWantsAnyNode		(xmlStreamCtxtPtr streamCtxt)

Query if the streaming pattern additionally needs to be fed with text-, cdata-section-, comment- and processing-instruction-nodes. If the result is 0 then only element-nodes and attribute-nodes need to be pushed.

streamCtxt:the stream context
Returns:1 in case of need of nodes of the above described types, 0 otherwise. -1 on API errors.