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annotate env/lib/python3.7/site-packages/lxml/includes/libxml/xpath.h @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 /*
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2 * Summary: XML Path Language implementation
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3 * Description: API for the XML Path Language implementation
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4 *
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5 * XML Path Language implementation
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6 * XPath is a language for addressing parts of an XML document,
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7 * designed to be used by both XSLT and XPointer
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8 * http://www.w3.org/TR/xpath
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9 *
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10 * Implements
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11 * W3C Recommendation 16 November 1999
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12 * http://www.w3.org/TR/1999/REC-xpath-19991116
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13 *
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14 * Copy: See Copyright for the status of this software.
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15 *
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16 * Author: Daniel Veillard
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17 */
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18
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19 #ifndef __XML_XPATH_H__
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20 #define __XML_XPATH_H__
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21
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22 #include <libxml/xmlversion.h>
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23
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24 #ifdef LIBXML_XPATH_ENABLED
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25
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26 #include <libxml/xmlerror.h>
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27 #include <libxml/tree.h>
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28 #include <libxml/hash.h>
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29 #endif /* LIBXML_XPATH_ENABLED */
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30
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31 #if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
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32 #ifdef __cplusplus
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33 extern "C" {
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34 #endif
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35 #endif /* LIBXML_XPATH_ENABLED or LIBXML_SCHEMAS_ENABLED */
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36
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37 #ifdef LIBXML_XPATH_ENABLED
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38
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39 typedef struct _xmlXPathContext xmlXPathContext;
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40 typedef xmlXPathContext *xmlXPathContextPtr;
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41 typedef struct _xmlXPathParserContext xmlXPathParserContext;
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42 typedef xmlXPathParserContext *xmlXPathParserContextPtr;
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43
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44 /**
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45 * The set of XPath error codes.
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46 */
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47
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48 typedef enum {
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49 XPATH_EXPRESSION_OK = 0,
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50 XPATH_NUMBER_ERROR,
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51 XPATH_UNFINISHED_LITERAL_ERROR,
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52 XPATH_START_LITERAL_ERROR,
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53 XPATH_VARIABLE_REF_ERROR,
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54 XPATH_UNDEF_VARIABLE_ERROR,
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55 XPATH_INVALID_PREDICATE_ERROR,
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56 XPATH_EXPR_ERROR,
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57 XPATH_UNCLOSED_ERROR,
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58 XPATH_UNKNOWN_FUNC_ERROR,
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59 XPATH_INVALID_OPERAND,
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60 XPATH_INVALID_TYPE,
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61 XPATH_INVALID_ARITY,
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62 XPATH_INVALID_CTXT_SIZE,
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63 XPATH_INVALID_CTXT_POSITION,
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64 XPATH_MEMORY_ERROR,
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65 XPTR_SYNTAX_ERROR,
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66 XPTR_RESOURCE_ERROR,
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67 XPTR_SUB_RESOURCE_ERROR,
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68 XPATH_UNDEF_PREFIX_ERROR,
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69 XPATH_ENCODING_ERROR,
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70 XPATH_INVALID_CHAR_ERROR,
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71 XPATH_INVALID_CTXT,
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72 XPATH_STACK_ERROR,
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73 XPATH_FORBID_VARIABLE_ERROR,
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74 XPATH_OP_LIMIT_EXCEEDED,
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75 XPATH_RECURSION_LIMIT_EXCEEDED
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76 } xmlXPathError;
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77
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78 /*
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79 * A node-set (an unordered collection of nodes without duplicates).
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80 */
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81 typedef struct _xmlNodeSet xmlNodeSet;
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82 typedef xmlNodeSet *xmlNodeSetPtr;
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83 struct _xmlNodeSet {
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84 int nodeNr; /* number of nodes in the set */
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85 int nodeMax; /* size of the array as allocated */
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86 xmlNodePtr *nodeTab; /* array of nodes in no particular order */
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87 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
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88 };
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89
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90 /*
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91 * An expression is evaluated to yield an object, which
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92 * has one of the following four basic types:
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93 * - node-set
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94 * - boolean
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95 * - number
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96 * - string
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97 *
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98 * @@ XPointer will add more types !
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99 */
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100
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101 typedef enum {
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102 XPATH_UNDEFINED = 0,
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103 XPATH_NODESET = 1,
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104 XPATH_BOOLEAN = 2,
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105 XPATH_NUMBER = 3,
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106 XPATH_STRING = 4,
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107 XPATH_POINT = 5,
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108 XPATH_RANGE = 6,
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109 XPATH_LOCATIONSET = 7,
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110 XPATH_USERS = 8,
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111 XPATH_XSLT_TREE = 9 /* An XSLT value tree, non modifiable */
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112 } xmlXPathObjectType;
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113
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114 typedef struct _xmlXPathObject xmlXPathObject;
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115 typedef xmlXPathObject *xmlXPathObjectPtr;
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116 struct _xmlXPathObject {
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117 xmlXPathObjectType type;
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118 xmlNodeSetPtr nodesetval;
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119 int boolval;
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120 double floatval;
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121 xmlChar *stringval;
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122 void *user;
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123 int index;
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124 void *user2;
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125 int index2;
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126 };
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127
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128 /**
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129 * xmlXPathConvertFunc:
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130 * @obj: an XPath object
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131 * @type: the number of the target type
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132 *
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133 * A conversion function is associated to a type and used to cast
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134 * the new type to primitive values.
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135 *
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136 * Returns -1 in case of error, 0 otherwise
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137 */
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138 typedef int (*xmlXPathConvertFunc) (xmlXPathObjectPtr obj, int type);
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139
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140 /*
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141 * Extra type: a name and a conversion function.
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142 */
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143
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144 typedef struct _xmlXPathType xmlXPathType;
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145 typedef xmlXPathType *xmlXPathTypePtr;
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146 struct _xmlXPathType {
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147 const xmlChar *name; /* the type name */
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148 xmlXPathConvertFunc func; /* the conversion function */
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149 };
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150
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151 /*
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152 * Extra variable: a name and a value.
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153 */
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154
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155 typedef struct _xmlXPathVariable xmlXPathVariable;
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156 typedef xmlXPathVariable *xmlXPathVariablePtr;
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157 struct _xmlXPathVariable {
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158 const xmlChar *name; /* the variable name */
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159 xmlXPathObjectPtr value; /* the value */
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160 };
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161
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162 /**
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163 * xmlXPathEvalFunc:
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164 * @ctxt: an XPath parser context
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165 * @nargs: the number of arguments passed to the function
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166 *
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167 * An XPath evaluation function, the parameters are on the XPath context stack.
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168 */
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169
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170 typedef void (*xmlXPathEvalFunc)(xmlXPathParserContextPtr ctxt,
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171 int nargs);
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172
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173 /*
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174 * Extra function: a name and a evaluation function.
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175 */
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176
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177 typedef struct _xmlXPathFunct xmlXPathFunct;
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178 typedef xmlXPathFunct *xmlXPathFuncPtr;
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179 struct _xmlXPathFunct {
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180 const xmlChar *name; /* the function name */
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181 xmlXPathEvalFunc func; /* the evaluation function */
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182 };
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183
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184 /**
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185 * xmlXPathAxisFunc:
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186 * @ctxt: the XPath interpreter context
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187 * @cur: the previous node being explored on that axis
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188 *
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189 * An axis traversal function. To traverse an axis, the engine calls
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190 * the first time with cur == NULL and repeat until the function returns
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191 * NULL indicating the end of the axis traversal.
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192 *
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193 * Returns the next node in that axis or NULL if at the end of the axis.
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194 */
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195
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196 typedef xmlXPathObjectPtr (*xmlXPathAxisFunc) (xmlXPathParserContextPtr ctxt,
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197 xmlXPathObjectPtr cur);
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198
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199 /*
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200 * Extra axis: a name and an axis function.
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201 */
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202
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203 typedef struct _xmlXPathAxis xmlXPathAxis;
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204 typedef xmlXPathAxis *xmlXPathAxisPtr;
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205 struct _xmlXPathAxis {
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206 const xmlChar *name; /* the axis name */
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207 xmlXPathAxisFunc func; /* the search function */
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208 };
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209
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210 /**
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211 * xmlXPathFunction:
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212 * @ctxt: the XPath interprestation context
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213 * @nargs: the number of arguments
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214 *
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215 * An XPath function.
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216 * The arguments (if any) are popped out from the context stack
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217 * and the result is pushed on the stack.
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218 */
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219
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220 typedef void (*xmlXPathFunction) (xmlXPathParserContextPtr ctxt, int nargs);
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221
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222 /*
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223 * Function and Variable Lookup.
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224 */
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225
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226 /**
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227 * xmlXPathVariableLookupFunc:
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228 * @ctxt: an XPath context
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229 * @name: name of the variable
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230 * @ns_uri: the namespace name hosting this variable
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231 *
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232 * Prototype for callbacks used to plug variable lookup in the XPath
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233 * engine.
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234 *
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235 * Returns the XPath object value or NULL if not found.
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236 */
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237 typedef xmlXPathObjectPtr (*xmlXPathVariableLookupFunc) (void *ctxt,
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238 const xmlChar *name,
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239 const xmlChar *ns_uri);
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240
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241 /**
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242 * xmlXPathFuncLookupFunc:
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243 * @ctxt: an XPath context
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244 * @name: name of the function
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245 * @ns_uri: the namespace name hosting this function
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246 *
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247 * Prototype for callbacks used to plug function lookup in the XPath
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248 * engine.
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249 *
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250 * Returns the XPath function or NULL if not found.
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251 */
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252 typedef xmlXPathFunction (*xmlXPathFuncLookupFunc) (void *ctxt,
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253 const xmlChar *name,
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254 const xmlChar *ns_uri);
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255
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256 /**
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257 * xmlXPathFlags:
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258 * Flags for XPath engine compilation and runtime
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259 */
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260 /**
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261 * XML_XPATH_CHECKNS:
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262 *
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263 * check namespaces at compilation
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264 */
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265 #define XML_XPATH_CHECKNS (1<<0)
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266 /**
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267 * XML_XPATH_NOVAR:
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268 *
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269 * forbid variables in expression
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270 */
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271 #define XML_XPATH_NOVAR (1<<1)
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272
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273 /**
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274 * xmlXPathContext:
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275 *
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276 * Expression evaluation occurs with respect to a context.
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277 * he context consists of:
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278 * - a node (the context node)
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279 * - a node list (the context node list)
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280 * - a set of variable bindings
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281 * - a function library
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282 * - the set of namespace declarations in scope for the expression
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283 * Following the switch to hash tables, this need to be trimmed up at
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284 * the next binary incompatible release.
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285 * The node may be modified when the context is passed to libxml2
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286 * for an XPath evaluation so you may need to initialize it again
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287 * before the next call.
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288 */
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289
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290 struct _xmlXPathContext {
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291 xmlDocPtr doc; /* The current document */
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292 xmlNodePtr node; /* The current node */
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293
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294 int nb_variables_unused; /* unused (hash table) */
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295 int max_variables_unused; /* unused (hash table) */
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296 xmlHashTablePtr varHash; /* Hash table of defined variables */
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297
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298 int nb_types; /* number of defined types */
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299 int max_types; /* max number of types */
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300 xmlXPathTypePtr types; /* Array of defined types */
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301
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302 int nb_funcs_unused; /* unused (hash table) */
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303 int max_funcs_unused; /* unused (hash table) */
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304 xmlHashTablePtr funcHash; /* Hash table of defined funcs */
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305
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306 int nb_axis; /* number of defined axis */
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307 int max_axis; /* max number of axis */
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308 xmlXPathAxisPtr axis; /* Array of defined axis */
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309
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310 /* the namespace nodes of the context node */
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311 xmlNsPtr *namespaces; /* Array of namespaces */
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312 int nsNr; /* number of namespace in scope */
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313 void *user; /* function to free */
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314
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315 /* extra variables */
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316 int contextSize; /* the context size */
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317 int proximityPosition; /* the proximity position */
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318
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319 /* extra stuff for XPointer */
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320 int xptr; /* is this an XPointer context? */
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321 xmlNodePtr here; /* for here() */
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322 xmlNodePtr origin; /* for origin() */
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323
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324 /* the set of namespace declarations in scope for the expression */
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325 xmlHashTablePtr nsHash; /* The namespaces hash table */
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326 xmlXPathVariableLookupFunc varLookupFunc;/* variable lookup func */
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327 void *varLookupData; /* variable lookup data */
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328
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329 /* Possibility to link in an extra item */
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330 void *extra; /* needed for XSLT */
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331
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332 /* The function name and URI when calling a function */
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333 const xmlChar *function;
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334 const xmlChar *functionURI;
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335
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336 /* function lookup function and data */
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337 xmlXPathFuncLookupFunc funcLookupFunc;/* function lookup func */
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338 void *funcLookupData; /* function lookup data */
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339
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340 /* temporary namespace lists kept for walking the namespace axis */
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341 xmlNsPtr *tmpNsList; /* Array of namespaces */
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342 int tmpNsNr; /* number of namespaces in scope */
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343
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344 /* error reporting mechanism */
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345 void *userData; /* user specific data block */
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346 xmlStructuredErrorFunc error; /* the callback in case of errors */
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347 xmlError lastError; /* the last error */
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348 xmlNodePtr debugNode; /* the source node XSLT */
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349
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350 /* dictionary */
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351 xmlDictPtr dict; /* dictionary if any */
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352
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353 int flags; /* flags to control compilation */
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354
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355 /* Cache for reusal of XPath objects */
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356 void *cache;
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357
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358 /* Resource limits */
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359 unsigned long opLimit;
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360 unsigned long opCount;
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361 int depth;
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362 int maxDepth;
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363 int maxParserDepth;
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364 };
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365
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366 /*
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367 * The structure of a compiled expression form is not public.
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368 */
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369
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370 typedef struct _xmlXPathCompExpr xmlXPathCompExpr;
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371 typedef xmlXPathCompExpr *xmlXPathCompExprPtr;
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372
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373 /**
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374 * xmlXPathParserContext:
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375 *
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376 * An XPath parser context. It contains pure parsing informations,
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377 * an xmlXPathContext, and the stack of objects.
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378 */
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379 struct _xmlXPathParserContext {
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380 const xmlChar *cur; /* the current char being parsed */
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381 const xmlChar *base; /* the full expression */
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382
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383 int error; /* error code */
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384
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385 xmlXPathContextPtr context; /* the evaluation context */
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386 xmlXPathObjectPtr value; /* the current value */
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387 int valueNr; /* number of values stacked */
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388 int valueMax; /* max number of values stacked */
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389 xmlXPathObjectPtr *valueTab; /* stack of values */
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390
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391 xmlXPathCompExprPtr comp; /* the precompiled expression */
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392 int xptr; /* it this an XPointer expression */
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393 xmlNodePtr ancestor; /* used for walking preceding axis */
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394
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395 int valueFrame; /* used to limit Pop on the stack */
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396 };
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397
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398 /************************************************************************
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399 * *
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400 * Public API *
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401 * *
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402 ************************************************************************/
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403
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404 /**
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405 * Objects and Nodesets handling
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406 */
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407
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408 XMLPUBVAR double xmlXPathNAN;
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409 XMLPUBVAR double xmlXPathPINF;
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410 XMLPUBVAR double xmlXPathNINF;
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411
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412 /* These macros may later turn into functions */
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413 /**
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414 * xmlXPathNodeSetGetLength:
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415 * @ns: a node-set
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416 *
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417 * Implement a functionality similar to the DOM NodeList.length.
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418 *
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419 * Returns the number of nodes in the node-set.
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420 */
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421 #define xmlXPathNodeSetGetLength(ns) ((ns) ? (ns)->nodeNr : 0)
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422 /**
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423 * xmlXPathNodeSetItem:
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424 * @ns: a node-set
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425 * @index: index of a node in the set
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426 *
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427 * Implements a functionality similar to the DOM NodeList.item().
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428 *
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429 * Returns the xmlNodePtr at the given @index in @ns or NULL if
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430 * @index is out of range (0 to length-1)
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431 */
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432 #define xmlXPathNodeSetItem(ns, index) \
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433 ((((ns) != NULL) && \
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434 ((index) >= 0) && ((index) < (ns)->nodeNr)) ? \
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435 (ns)->nodeTab[(index)] \
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436 : NULL)
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437 /**
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438 * xmlXPathNodeSetIsEmpty:
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439 * @ns: a node-set
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440 *
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441 * Checks whether @ns is empty or not.
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442 *
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443 * Returns %TRUE if @ns is an empty node-set.
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444 */
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445 #define xmlXPathNodeSetIsEmpty(ns) \
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446 (((ns) == NULL) || ((ns)->nodeNr == 0) || ((ns)->nodeTab == NULL))
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447
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448
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449 XMLPUBFUN void XMLCALL
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450 xmlXPathFreeObject (xmlXPathObjectPtr obj);
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451 XMLPUBFUN xmlNodeSetPtr XMLCALL
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452 xmlXPathNodeSetCreate (xmlNodePtr val);
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453 XMLPUBFUN void XMLCALL
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454 xmlXPathFreeNodeSetList (xmlXPathObjectPtr obj);
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455 XMLPUBFUN void XMLCALL
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456 xmlXPathFreeNodeSet (xmlNodeSetPtr obj);
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457 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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458 xmlXPathObjectCopy (xmlXPathObjectPtr val);
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459 XMLPUBFUN int XMLCALL
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460 xmlXPathCmpNodes (xmlNodePtr node1,
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461 xmlNodePtr node2);
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462 /**
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463 * Conversion functions to basic types.
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464 */
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465 XMLPUBFUN int XMLCALL
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466 xmlXPathCastNumberToBoolean (double val);
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467 XMLPUBFUN int XMLCALL
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468 xmlXPathCastStringToBoolean (const xmlChar * val);
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469 XMLPUBFUN int XMLCALL
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470 xmlXPathCastNodeSetToBoolean(xmlNodeSetPtr ns);
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471 XMLPUBFUN int XMLCALL
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472 xmlXPathCastToBoolean (xmlXPathObjectPtr val);
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473
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474 XMLPUBFUN double XMLCALL
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475 xmlXPathCastBooleanToNumber (int val);
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476 XMLPUBFUN double XMLCALL
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477 xmlXPathCastStringToNumber (const xmlChar * val);
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478 XMLPUBFUN double XMLCALL
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479 xmlXPathCastNodeToNumber (xmlNodePtr node);
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480 XMLPUBFUN double XMLCALL
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481 xmlXPathCastNodeSetToNumber (xmlNodeSetPtr ns);
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482 XMLPUBFUN double XMLCALL
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483 xmlXPathCastToNumber (xmlXPathObjectPtr val);
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484
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485 XMLPUBFUN xmlChar * XMLCALL
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486 xmlXPathCastBooleanToString (int val);
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487 XMLPUBFUN xmlChar * XMLCALL
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488 xmlXPathCastNumberToString (double val);
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489 XMLPUBFUN xmlChar * XMLCALL
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490 xmlXPathCastNodeToString (xmlNodePtr node);
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491 XMLPUBFUN xmlChar * XMLCALL
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492 xmlXPathCastNodeSetToString (xmlNodeSetPtr ns);
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493 XMLPUBFUN xmlChar * XMLCALL
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494 xmlXPathCastToString (xmlXPathObjectPtr val);
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495
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496 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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497 xmlXPathConvertBoolean (xmlXPathObjectPtr val);
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498 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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499 xmlXPathConvertNumber (xmlXPathObjectPtr val);
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500 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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501 xmlXPathConvertString (xmlXPathObjectPtr val);
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502
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503 /**
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504 * Context handling.
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505 */
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506 XMLPUBFUN xmlXPathContextPtr XMLCALL
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507 xmlXPathNewContext (xmlDocPtr doc);
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508 XMLPUBFUN void XMLCALL
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509 xmlXPathFreeContext (xmlXPathContextPtr ctxt);
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510 XMLPUBFUN int XMLCALL
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511 xmlXPathContextSetCache(xmlXPathContextPtr ctxt,
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512 int active,
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513 int value,
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514 int options);
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515 /**
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516 * Evaluation functions.
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517 */
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518 XMLPUBFUN long XMLCALL
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519 xmlXPathOrderDocElems (xmlDocPtr doc);
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520 XMLPUBFUN int XMLCALL
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521 xmlXPathSetContextNode (xmlNodePtr node,
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522 xmlXPathContextPtr ctx);
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523 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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524 xmlXPathNodeEval (xmlNodePtr node,
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525 const xmlChar *str,
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526 xmlXPathContextPtr ctx);
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527 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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528 xmlXPathEval (const xmlChar *str,
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529 xmlXPathContextPtr ctx);
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530 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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531 xmlXPathEvalExpression (const xmlChar *str,
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532 xmlXPathContextPtr ctxt);
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533 XMLPUBFUN int XMLCALL
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534 xmlXPathEvalPredicate (xmlXPathContextPtr ctxt,
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535 xmlXPathObjectPtr res);
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536 /**
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537 * Separate compilation/evaluation entry points.
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538 */
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539 XMLPUBFUN xmlXPathCompExprPtr XMLCALL
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540 xmlXPathCompile (const xmlChar *str);
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541 XMLPUBFUN xmlXPathCompExprPtr XMLCALL
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542 xmlXPathCtxtCompile (xmlXPathContextPtr ctxt,
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543 const xmlChar *str);
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544 XMLPUBFUN xmlXPathObjectPtr XMLCALL
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545 xmlXPathCompiledEval (xmlXPathCompExprPtr comp,
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546 xmlXPathContextPtr ctx);
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547 XMLPUBFUN int XMLCALL
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548 xmlXPathCompiledEvalToBoolean(xmlXPathCompExprPtr comp,
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549 xmlXPathContextPtr ctxt);
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550 XMLPUBFUN void XMLCALL
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551 xmlXPathFreeCompExpr (xmlXPathCompExprPtr comp);
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552 #endif /* LIBXML_XPATH_ENABLED */
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553 #if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
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554 XMLPUBFUN void XMLCALL
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555 xmlXPathInit (void);
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556 XMLPUBFUN int XMLCALL
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557 xmlXPathIsNaN (double val);
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558 XMLPUBFUN int XMLCALL
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559 xmlXPathIsInf (double val);
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560
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561 #ifdef __cplusplus
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562 }
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563 #endif
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564
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565 #endif /* LIBXML_XPATH_ENABLED or LIBXML_SCHEMAS_ENABLED*/
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566 #endif /* ! __XML_XPATH_H__ */