576 lines
16 KiB
C
576 lines
16 KiB
C
/*
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* Summary: XML Path Language implementation
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* Description: API for the XML Path Language implementation
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*
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* XML Path Language implementation
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* XPath is a language for addressing parts of an XML document,
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* designed to be used by both XSLT and XPointer
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* http://www.w3.org/TR/xpath
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*
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* Implements
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* W3C Recommendation 16 November 1999
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* http://www.w3.org/TR/1999/REC-xpath-19991116
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*
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* Copy: See Copyright for the status of this software.
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*
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* Author: Daniel Veillard
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*/
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#ifndef __XML_XPATH_H__
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#define __XML_XPATH_H__
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#include <libxml/xmlversion.h>
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#ifdef LIBXML_XPATH_ENABLED
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#include <libxml/xmlerror.h>
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#include <libxml/tree.h>
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#include <libxml/hash.h>
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#endif /* LIBXML_XPATH_ENABLED */
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#if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#endif /* LIBXML_XPATH_ENABLED or LIBXML_SCHEMAS_ENABLED */
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#ifdef LIBXML_XPATH_ENABLED
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typedef struct _xmlXPathContext xmlXPathContext;
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typedef xmlXPathContext *xmlXPathContextPtr;
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typedef struct _xmlXPathParserContext xmlXPathParserContext;
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typedef xmlXPathParserContext *xmlXPathParserContextPtr;
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/**
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* The set of XPath error codes.
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*/
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typedef enum {
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XPATH_EXPRESSION_OK = 0,
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XPATH_NUMBER_ERROR,
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XPATH_UNFINISHED_LITERAL_ERROR,
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XPATH_START_LITERAL_ERROR,
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XPATH_VARIABLE_REF_ERROR,
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XPATH_UNDEF_VARIABLE_ERROR,
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XPATH_INVALID_PREDICATE_ERROR,
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XPATH_EXPR_ERROR,
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XPATH_UNCLOSED_ERROR,
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XPATH_UNKNOWN_FUNC_ERROR,
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XPATH_INVALID_OPERAND,
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XPATH_INVALID_TYPE,
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XPATH_INVALID_ARITY,
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XPATH_INVALID_CTXT_SIZE,
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XPATH_INVALID_CTXT_POSITION,
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XPATH_MEMORY_ERROR,
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XPTR_SYNTAX_ERROR,
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XPTR_RESOURCE_ERROR,
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XPTR_SUB_RESOURCE_ERROR,
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XPATH_UNDEF_PREFIX_ERROR,
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XPATH_ENCODING_ERROR,
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XPATH_INVALID_CHAR_ERROR,
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XPATH_INVALID_CTXT,
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XPATH_STACK_ERROR,
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XPATH_FORBID_VARIABLE_ERROR,
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XPATH_OP_LIMIT_EXCEEDED,
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XPATH_RECURSION_LIMIT_EXCEEDED
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} xmlXPathError;
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/*
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* A node-set (an unordered collection of nodes without duplicates).
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*/
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typedef struct _xmlNodeSet xmlNodeSet;
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typedef xmlNodeSet *xmlNodeSetPtr;
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struct _xmlNodeSet {
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int nodeNr; /* number of nodes in the set */
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int nodeMax; /* size of the array as allocated */
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xmlNodePtr *nodeTab; /* array of nodes in no particular order */
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/* @@ with_ns to check whether namespace nodes should be looked at @@ */
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};
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/*
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* An expression is evaluated to yield an object, which
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* has one of the following four basic types:
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* - node-set
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* - boolean
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* - number
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* - string
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*
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* @@ XPointer will add more types !
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*/
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typedef enum {
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XPATH_UNDEFINED = 0,
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XPATH_NODESET = 1,
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XPATH_BOOLEAN = 2,
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XPATH_NUMBER = 3,
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XPATH_STRING = 4,
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#ifdef LIBXML_XPTR_LOCS_ENABLED
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XPATH_POINT = 5,
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XPATH_RANGE = 6,
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XPATH_LOCATIONSET = 7,
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#endif
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XPATH_USERS = 8,
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XPATH_XSLT_TREE = 9 /* An XSLT value tree, non modifiable */
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} xmlXPathObjectType;
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#ifndef LIBXML_XPTR_LOCS_ENABLED
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/** DOC_DISABLE */
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#define XPATH_POINT 5
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#define XPATH_RANGE 6
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#define XPATH_LOCATIONSET 7
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/** DOC_ENABLE */
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#endif
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typedef struct _xmlXPathObject xmlXPathObject;
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typedef xmlXPathObject *xmlXPathObjectPtr;
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struct _xmlXPathObject {
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xmlXPathObjectType type;
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xmlNodeSetPtr nodesetval;
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int boolval;
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double floatval;
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xmlChar *stringval;
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void *user;
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int index;
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void *user2;
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int index2;
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};
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/**
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* xmlXPathConvertFunc:
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* @obj: an XPath object
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* @type: the number of the target type
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*
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* A conversion function is associated to a type and used to cast
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* the new type to primitive values.
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*
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* Returns -1 in case of error, 0 otherwise
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*/
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typedef int (*xmlXPathConvertFunc) (xmlXPathObjectPtr obj, int type);
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/*
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* Extra type: a name and a conversion function.
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*/
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typedef struct _xmlXPathType xmlXPathType;
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typedef xmlXPathType *xmlXPathTypePtr;
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struct _xmlXPathType {
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const xmlChar *name; /* the type name */
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xmlXPathConvertFunc func; /* the conversion function */
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};
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/*
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* Extra variable: a name and a value.
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*/
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typedef struct _xmlXPathVariable xmlXPathVariable;
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typedef xmlXPathVariable *xmlXPathVariablePtr;
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struct _xmlXPathVariable {
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const xmlChar *name; /* the variable name */
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xmlXPathObjectPtr value; /* the value */
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};
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/**
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* xmlXPathEvalFunc:
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* @ctxt: an XPath parser context
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* @nargs: the number of arguments passed to the function
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*
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* An XPath evaluation function, the parameters are on the XPath context stack.
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*/
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typedef void (*xmlXPathEvalFunc)(xmlXPathParserContextPtr ctxt,
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int nargs);
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/*
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* Extra function: a name and a evaluation function.
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*/
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typedef struct _xmlXPathFunct xmlXPathFunct;
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typedef xmlXPathFunct *xmlXPathFuncPtr;
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struct _xmlXPathFunct {
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const xmlChar *name; /* the function name */
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xmlXPathEvalFunc func; /* the evaluation function */
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};
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/**
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* xmlXPathAxisFunc:
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* @ctxt: the XPath interpreter context
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* @cur: the previous node being explored on that axis
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*
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* An axis traversal function. To traverse an axis, the engine calls
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* the first time with cur == NULL and repeat until the function returns
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* NULL indicating the end of the axis traversal.
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*
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* Returns the next node in that axis or NULL if at the end of the axis.
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*/
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typedef xmlXPathObjectPtr (*xmlXPathAxisFunc) (xmlXPathParserContextPtr ctxt,
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xmlXPathObjectPtr cur);
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/*
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* Extra axis: a name and an axis function.
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*/
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typedef struct _xmlXPathAxis xmlXPathAxis;
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typedef xmlXPathAxis *xmlXPathAxisPtr;
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struct _xmlXPathAxis {
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const xmlChar *name; /* the axis name */
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xmlXPathAxisFunc func; /* the search function */
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};
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/**
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* xmlXPathFunction:
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* @ctxt: the XPath interprestation context
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* @nargs: the number of arguments
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*
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* An XPath function.
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* The arguments (if any) are popped out from the context stack
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* and the result is pushed on the stack.
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*/
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typedef void (*xmlXPathFunction) (xmlXPathParserContextPtr ctxt, int nargs);
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/*
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* Function and Variable Lookup.
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*/
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/**
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* xmlXPathVariableLookupFunc:
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* @ctxt: an XPath context
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* @name: name of the variable
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* @ns_uri: the namespace name hosting this variable
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*
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* Prototype for callbacks used to plug variable lookup in the XPath
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* engine.
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*
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* Returns the XPath object value or NULL if not found.
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*/
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typedef xmlXPathObjectPtr (*xmlXPathVariableLookupFunc) (void *ctxt,
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const xmlChar *name,
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const xmlChar *ns_uri);
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/**
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* xmlXPathFuncLookupFunc:
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* @ctxt: an XPath context
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* @name: name of the function
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* @ns_uri: the namespace name hosting this function
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*
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* Prototype for callbacks used to plug function lookup in the XPath
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* engine.
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*
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* Returns the XPath function or NULL if not found.
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*/
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typedef xmlXPathFunction (*xmlXPathFuncLookupFunc) (void *ctxt,
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const xmlChar *name,
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const xmlChar *ns_uri);
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/**
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* xmlXPathFlags:
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* Flags for XPath engine compilation and runtime
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*/
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/**
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* XML_XPATH_CHECKNS:
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*
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* check namespaces at compilation
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*/
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#define XML_XPATH_CHECKNS (1<<0)
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/**
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* XML_XPATH_NOVAR:
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*
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* forbid variables in expression
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*/
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#define XML_XPATH_NOVAR (1<<1)
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/**
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* xmlXPathContext:
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*
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* Expression evaluation occurs with respect to a context.
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* he context consists of:
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* - a node (the context node)
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* - a node list (the context node list)
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* - a set of variable bindings
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* - a function library
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* - the set of namespace declarations in scope for the expression
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* Following the switch to hash tables, this need to be trimmed up at
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* the next binary incompatible release.
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* The node may be modified when the context is passed to libxml2
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* for an XPath evaluation so you may need to initialize it again
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* before the next call.
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*/
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struct _xmlXPathContext {
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xmlDocPtr doc; /* The current document */
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xmlNodePtr node; /* The current node */
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int nb_variables_unused; /* unused (hash table) */
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int max_variables_unused; /* unused (hash table) */
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xmlHashTablePtr varHash; /* Hash table of defined variables */
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int nb_types; /* number of defined types */
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int max_types; /* max number of types */
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xmlXPathTypePtr types; /* Array of defined types */
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int nb_funcs_unused; /* unused (hash table) */
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int max_funcs_unused; /* unused (hash table) */
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xmlHashTablePtr funcHash; /* Hash table of defined funcs */
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int nb_axis; /* number of defined axis */
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int max_axis; /* max number of axis */
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xmlXPathAxisPtr axis; /* Array of defined axis */
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/* the namespace nodes of the context node */
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xmlNsPtr *namespaces; /* Array of namespaces */
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int nsNr; /* number of namespace in scope */
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void *user; /* function to free */
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/* extra variables */
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int contextSize; /* the context size */
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int proximityPosition; /* the proximity position */
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/* extra stuff for XPointer */
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int xptr; /* is this an XPointer context? */
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xmlNodePtr here; /* for here() */
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xmlNodePtr origin; /* for origin() */
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/* the set of namespace declarations in scope for the expression */
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xmlHashTablePtr nsHash; /* The namespaces hash table */
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xmlXPathVariableLookupFunc varLookupFunc;/* variable lookup func */
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void *varLookupData; /* variable lookup data */
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/* Possibility to link in an extra item */
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void *extra; /* needed for XSLT */
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/* The function name and URI when calling a function */
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const xmlChar *function;
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const xmlChar *functionURI;
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/* function lookup function and data */
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xmlXPathFuncLookupFunc funcLookupFunc;/* function lookup func */
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void *funcLookupData; /* function lookup data */
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/* temporary namespace lists kept for walking the namespace axis */
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xmlNsPtr *tmpNsList; /* Array of namespaces */
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int tmpNsNr; /* number of namespaces in scope */
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/* error reporting mechanism */
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void *userData; /* user specific data block */
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xmlStructuredErrorFunc error; /* the callback in case of errors */
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xmlError lastError; /* the last error */
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xmlNodePtr debugNode; /* the source node XSLT */
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/* dictionary */
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xmlDictPtr dict; /* dictionary if any */
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int flags; /* flags to control compilation */
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/* Cache for reusal of XPath objects */
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void *cache;
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/* Resource limits */
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unsigned long opLimit;
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unsigned long opCount;
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int depth;
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};
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/*
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* The structure of a compiled expression form is not public.
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*/
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typedef struct _xmlXPathCompExpr xmlXPathCompExpr;
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typedef xmlXPathCompExpr *xmlXPathCompExprPtr;
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/**
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* xmlXPathParserContext:
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*
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* An XPath parser context. It contains pure parsing information,
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* an xmlXPathContext, and the stack of objects.
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*/
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struct _xmlXPathParserContext {
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const xmlChar *cur; /* the current char being parsed */
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const xmlChar *base; /* the full expression */
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int error; /* error code */
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xmlXPathContextPtr context; /* the evaluation context */
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xmlXPathObjectPtr value; /* the current value */
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int valueNr; /* number of values stacked */
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int valueMax; /* max number of values stacked */
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xmlXPathObjectPtr *valueTab; /* stack of values */
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xmlXPathCompExprPtr comp; /* the precompiled expression */
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int xptr; /* it this an XPointer expression */
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xmlNodePtr ancestor; /* used for walking preceding axis */
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int valueFrame; /* used to limit Pop on the stack */
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};
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/************************************************************************
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* *
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* Public API *
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* *
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************************************************************************/
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/**
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* Objects and Nodesets handling
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*/
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XMLPUBVAR double xmlXPathNAN;
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XMLPUBVAR double xmlXPathPINF;
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XMLPUBVAR double xmlXPathNINF;
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/* These macros may later turn into functions */
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/**
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* xmlXPathNodeSetGetLength:
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* @ns: a node-set
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*
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* Implement a functionality similar to the DOM NodeList.length.
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*
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* Returns the number of nodes in the node-set.
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*/
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#define xmlXPathNodeSetGetLength(ns) ((ns) ? (ns)->nodeNr : 0)
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/**
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* xmlXPathNodeSetItem:
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* @ns: a node-set
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* @index: index of a node in the set
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*
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* Implements a functionality similar to the DOM NodeList.item().
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*
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* Returns the xmlNodePtr at the given @index in @ns or NULL if
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* @index is out of range (0 to length-1)
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*/
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#define xmlXPathNodeSetItem(ns, index) \
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((((ns) != NULL) && \
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((index) >= 0) && ((index) < (ns)->nodeNr)) ? \
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(ns)->nodeTab[(index)] \
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: NULL)
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/**
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* xmlXPathNodeSetIsEmpty:
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* @ns: a node-set
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*
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* Checks whether @ns is empty or not.
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*
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* Returns %TRUE if @ns is an empty node-set.
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*/
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#define xmlXPathNodeSetIsEmpty(ns) \
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(((ns) == NULL) || ((ns)->nodeNr == 0) || ((ns)->nodeTab == NULL))
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XMLPUBFUN void XMLCALL
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xmlXPathFreeObject (xmlXPathObjectPtr obj);
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XMLPUBFUN xmlNodeSetPtr XMLCALL
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xmlXPathNodeSetCreate (xmlNodePtr val);
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XMLPUBFUN void XMLCALL
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xmlXPathFreeNodeSetList (xmlXPathObjectPtr obj);
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XMLPUBFUN void XMLCALL
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xmlXPathFreeNodeSet (xmlNodeSetPtr obj);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathObjectCopy (xmlXPathObjectPtr val);
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XMLPUBFUN int XMLCALL
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xmlXPathCmpNodes (xmlNodePtr node1,
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xmlNodePtr node2);
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/**
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* Conversion functions to basic types.
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*/
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XMLPUBFUN int XMLCALL
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xmlXPathCastNumberToBoolean (double val);
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XMLPUBFUN int XMLCALL
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xmlXPathCastStringToBoolean (const xmlChar * val);
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XMLPUBFUN int XMLCALL
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xmlXPathCastNodeSetToBoolean(xmlNodeSetPtr ns);
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XMLPUBFUN int XMLCALL
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xmlXPathCastToBoolean (xmlXPathObjectPtr val);
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XMLPUBFUN double XMLCALL
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xmlXPathCastBooleanToNumber (int val);
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XMLPUBFUN double XMLCALL
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xmlXPathCastStringToNumber (const xmlChar * val);
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XMLPUBFUN double XMLCALL
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xmlXPathCastNodeToNumber (xmlNodePtr node);
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XMLPUBFUN double XMLCALL
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xmlXPathCastNodeSetToNumber (xmlNodeSetPtr ns);
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XMLPUBFUN double XMLCALL
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xmlXPathCastToNumber (xmlXPathObjectPtr val);
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XMLPUBFUN xmlChar * XMLCALL
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xmlXPathCastBooleanToString (int val);
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XMLPUBFUN xmlChar * XMLCALL
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xmlXPathCastNumberToString (double val);
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XMLPUBFUN xmlChar * XMLCALL
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xmlXPathCastNodeToString (xmlNodePtr node);
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XMLPUBFUN xmlChar * XMLCALL
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xmlXPathCastNodeSetToString (xmlNodeSetPtr ns);
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XMLPUBFUN xmlChar * XMLCALL
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xmlXPathCastToString (xmlXPathObjectPtr val);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathConvertBoolean (xmlXPathObjectPtr val);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathConvertNumber (xmlXPathObjectPtr val);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathConvertString (xmlXPathObjectPtr val);
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/**
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* Context handling.
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*/
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XMLPUBFUN xmlXPathContextPtr XMLCALL
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xmlXPathNewContext (xmlDocPtr doc);
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XMLPUBFUN void XMLCALL
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xmlXPathFreeContext (xmlXPathContextPtr ctxt);
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XMLPUBFUN int XMLCALL
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xmlXPathContextSetCache(xmlXPathContextPtr ctxt,
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int active,
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int value,
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int options);
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/**
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* Evaluation functions.
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*/
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XMLPUBFUN long XMLCALL
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xmlXPathOrderDocElems (xmlDocPtr doc);
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XMLPUBFUN int XMLCALL
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xmlXPathSetContextNode (xmlNodePtr node,
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xmlXPathContextPtr ctx);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathNodeEval (xmlNodePtr node,
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const xmlChar *str,
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xmlXPathContextPtr ctx);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathEval (const xmlChar *str,
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xmlXPathContextPtr ctx);
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XMLPUBFUN xmlXPathObjectPtr XMLCALL
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xmlXPathEvalExpression (const xmlChar *str,
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xmlXPathContextPtr ctxt);
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XMLPUBFUN int XMLCALL
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xmlXPathEvalPredicate (xmlXPathContextPtr ctxt,
|
|
xmlXPathObjectPtr res);
|
|
/**
|
|
* Separate compilation/evaluation entry points.
|
|
*/
|
|
XMLPUBFUN xmlXPathCompExprPtr XMLCALL
|
|
xmlXPathCompile (const xmlChar *str);
|
|
XMLPUBFUN xmlXPathCompExprPtr XMLCALL
|
|
xmlXPathCtxtCompile (xmlXPathContextPtr ctxt,
|
|
const xmlChar *str);
|
|
XMLPUBFUN xmlXPathObjectPtr XMLCALL
|
|
xmlXPathCompiledEval (xmlXPathCompExprPtr comp,
|
|
xmlXPathContextPtr ctx);
|
|
XMLPUBFUN int XMLCALL
|
|
xmlXPathCompiledEvalToBoolean(xmlXPathCompExprPtr comp,
|
|
xmlXPathContextPtr ctxt);
|
|
XMLPUBFUN void XMLCALL
|
|
xmlXPathFreeCompExpr (xmlXPathCompExprPtr comp);
|
|
#endif /* LIBXML_XPATH_ENABLED */
|
|
#if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
|
|
XML_DEPRECATED
|
|
XMLPUBFUN void XMLCALL
|
|
xmlXPathInit (void);
|
|
XMLPUBFUN int XMLCALL
|
|
xmlXPathIsNaN (double val);
|
|
XMLPUBFUN int XMLCALL
|
|
xmlXPathIsInf (double val);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LIBXML_XPATH_ENABLED or LIBXML_SCHEMAS_ENABLED*/
|
|
#endif /* ! __XML_XPATH_H__ */
|