Annotation of XML/xpath.h, revision 1.11
1.1 daniel 1: /*
2: * xpath.c: interface for XML Path Language implementation
3: *
4: * Reference: W3C Working Draft 5 July 1999
5: * http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html
6: *
7: * See COPYRIGHT for the status of this software
8: *
9: * Author: Daniel.Veillard@w3.org
10: */
11:
12: #ifndef __XML_XPATH_H__
13: #define __XML_XPATH_H__
14:
1.11 ! daniel 15: #ifdef __cplusplus
! 16: #define extern "C" {
! 17: #endif
1.1 daniel 18: #include "tree.h"
19:
1.9 daniel 20: typedef struct xmlXPathParserContext *xmlXPathParserContextPtr;
21:
1.1 daniel 22: /*
23: * A node-set (an unordered collection of nodes without duplicates)
24: */
25: typedef struct xmlNodeSet {
26: int nodeNr; /* # of node in the set */
27: int nodeMax; /* allocated space */
28: xmlNodePtr *nodeTab; /* array of nodes in no particular order */
29: } xmlNodeSet, *xmlNodeSetPtr;
30:
31: /*
32: * An expression is evaluated to yield an object, which
33: * has one of the following four basic types:
34: * - node-set
35: * - boolean
36: * - number
37: * - string
38: */
39:
40: #define XPATH_UNDEFINED 0
41: #define XPATH_NODESET 1
42: #define XPATH_BOOLEAN 2
43: #define XPATH_NUMBER 3
44: #define XPATH_STRING 4
1.9 daniel 45: #define XPATH_USERS 5
1.1 daniel 46:
47: typedef struct xmlXPathObject {
48: int type;
49: xmlNodeSetPtr nodesetval;
50: int boolval;
1.6 daniel 51: double floatval;
1.10 daniel 52: xmlChar *stringval;
1.9 daniel 53: void *user;
1.1 daniel 54: } xmlXPathObject, *xmlXPathObjectPtr;
55:
1.9 daniel 56: /*
57: * A conversion function is associated to a type and used to cast
58: * the new type to primitive values.
59: */
60: typedef int (*xmlXPathConvertFunc) (xmlXPathObjectPtr obj, int type);
61:
62: /*
63: * Extra type: a name and a conversion function.
64: */
65:
66: typedef struct xmlXPathType {
1.10 daniel 67: const xmlChar *name; /* the type name */
1.9 daniel 68: xmlXPathConvertFunc func; /* the conversion function */
69: } xmlXPathType, *xmlXPathTypePtr;
70:
71: /*
72: * Extra variable: a name and a value.
73: */
74:
75: typedef struct xmlXPathVariable {
1.10 daniel 76: const xmlChar *name; /* the variable name */
1.9 daniel 77: xmlXPathObjectPtr value; /* the value */
78: } xmlXPathVariable, *xmlXPathVariablePtr;
79:
80: /*
81: * an evaluation function, the parameters are on the context stack
82: */
83:
84: typedef void (*xmlXPathEvalFunc)(xmlXPathParserContextPtr ctxt, int nargs);
85:
86: /*
87: * Extra function: a name and a evaluation function.
88: */
89:
90: typedef struct xmlXPathFunct {
1.10 daniel 91: const xmlChar *name; /* the function name */
1.9 daniel 92: xmlXPathEvalFunc func; /* the evaluation function */
93: } xmlXPathFunc, *xmlXPathFuncPtr;
94:
95: /*
96: * An axis traversal function. To traverse an axis, the engine calls
97: * the first time with cur == NULL and repeat until the function returns
98: * NULL indicating the end of the axis traversal.
99: */
100:
101: typedef xmlXPathObjectPtr (*xmlXPathAxisFunc) (xmlXPathParserContextPtr ctxt,
102: xmlXPathObjectPtr cur);
103:
104: /*
105: * Extra axis: a name and an axis function.
106: */
107:
108: typedef struct xmlXPathAxis {
1.10 daniel 109: const xmlChar *name; /* the axis name */
1.9 daniel 110: xmlXPathAxisFunc func; /* the search function */
111: } xmlXPathAxis, *xmlXPathAxisPtr;
112:
1.1 daniel 113: /*
114: * Expression evaluation occurs with respect to a context.
115: * he context consists of:
116: * - a node (the context node)
117: * - a node list (the context node list)
118: * - a set of variable bindings
119: * - a function library
120: * - the set of namespace declarations in scope for the expression
121: */
122:
123: typedef struct xmlXPathContext {
1.2 daniel 124: xmlDocPtr doc; /* The current document */
125: xmlNodePtr node; /* The current node */
126: xmlNodeSetPtr nodelist; /* The current node list */
1.9 daniel 127:
128: int nb_variables; /* number of defined variables */
129: int max_variables; /* max number of variables */
130: xmlXPathVariablePtr *variables; /* Array of defined variables */
131:
132: int nb_types; /* number of defined types */
133: int max_types; /* max number of types */
134: xmlXPathTypePtr *types; /* Array of defined types */
135:
136: int nb_funcs; /* number of defined funcs */
137: int max_funcs; /* max number of funcs */
138: xmlXPathFuncPtr *funcs; /* Array of defined funcs */
139:
140: int nb_axis; /* number of defined axis */
141: int max_axis; /* max number of axis */
142: xmlXPathAxisPtr *axis; /* Array of defined axis */
143:
144: /* Namespace traversal should be implemented with user */
1.8 daniel 145: xmlNsPtr *namespaces; /* The namespaces lookup */
146: int nsNr; /* the current Namespace index */
1.9 daniel 147: void *user; /* user defined extra info */
1.1 daniel 148: } xmlXPathContext, *xmlXPathContextPtr;
149:
150: /*
151: * An XPath parser context, it contains pure parsing informations,
152: * an xmlXPathContext, and the stack of objects.
153: */
154: typedef struct xmlXPathParserContext {
1.10 daniel 155: const xmlChar *cur; /* the current char being parsed */
156: const xmlChar *base; /* the full expression */
1.1 daniel 157:
158: int error; /* error code */
159:
160: xmlXPathContextPtr context; /* the evaluation context */
161: xmlXPathObjectPtr value; /* the current value */
162: int valueNr; /* number of values stacked */
163: int valueMax; /* max number of values stacked */
164: xmlXPathObjectPtr *valueTab; /* stack of values */
1.9 daniel 165: } xmlXPathParserContext;
1.1 daniel 166:
167: /*
168: * An XPath function
169: * The arguments (if any) are popped out of the context stack
170: * and the result is pushed on the stack.
171: */
172:
1.4 daniel 173: typedef void (*xmlXPathFunction) (xmlXPathParserContextPtr ctxt, int nargs);
1.1 daniel 174:
175: /************************************************************************
176: * *
177: * Public API *
178: * *
179: ************************************************************************/
180:
1.9 daniel 181: /**
182: * Registering extensions to the expression language
183: */
184: /* TODO */ int xmlXPathRegisterType (xmlXPathContextPtr ctxt,
1.10 daniel 185: const xmlChar *name,
1.9 daniel 186: xmlXPathConvertFunc f);
187: /* TODO */ int xmlXPathRegisterAxis (xmlXPathContextPtr ctxt,
1.10 daniel 188: const xmlChar *name,
1.9 daniel 189: xmlXPathAxisFunc f);
190: /* TODO */ int xmlXPathRegisterFunc (xmlXPathContextPtr ctxt,
1.10 daniel 191: const xmlChar *name,
1.9 daniel 192: xmlXPathFunction f);
193: /* TODO */ int xmlXPathRegisterVariable (xmlXPathContextPtr ctxt,
1.10 daniel 194: const xmlChar *name,
1.9 daniel 195: xmlXPathObject value);
196:
197: /**
198: * Evaluation functions.
199: */
200: xmlXPathContextPtr xmlXPathNewContext (xmlDocPtr doc);
1.8 daniel 201: void xmlXPathFreeContext (xmlXPathContextPtr ctxt);
1.10 daniel 202: xmlXPathObjectPtr xmlXPathEval (const xmlChar *str,
1.8 daniel 203: xmlXPathContextPtr ctxt);
204: void xmlXPathFreeObject (xmlXPathObjectPtr obj);
1.10 daniel 205: xmlXPathObjectPtr xmlXPathEvalExpression (const xmlChar *str,
1.8 daniel 206: xmlXPathContextPtr ctxt);
1.3 daniel 207:
1.11 ! daniel 208: #ifdef __cplusplus
! 209: }
! 210: #endif
1.1 daniel 211: #endif /* ! __XML_XPATH_H__ */
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