Annotation of XML/xpath.h, revision 1.12
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:
1.12 ! daniel 15: #include "tree.h"
! 16:
1.11 daniel 17: #ifdef __cplusplus
18: #define extern "C" {
19: #endif
1.1 daniel 20:
1.9 daniel 21: typedef struct xmlXPathParserContext *xmlXPathParserContextPtr;
22:
1.1 daniel 23: /*
24: * A node-set (an unordered collection of nodes without duplicates)
25: */
26: typedef struct xmlNodeSet {
27: int nodeNr; /* # of node in the set */
28: int nodeMax; /* allocated space */
29: xmlNodePtr *nodeTab; /* array of nodes in no particular order */
30: } xmlNodeSet, *xmlNodeSetPtr;
31:
32: /*
33: * An expression is evaluated to yield an object, which
34: * has one of the following four basic types:
35: * - node-set
36: * - boolean
37: * - number
38: * - string
39: */
40:
41: #define XPATH_UNDEFINED 0
42: #define XPATH_NODESET 1
43: #define XPATH_BOOLEAN 2
44: #define XPATH_NUMBER 3
45: #define XPATH_STRING 4
1.9 daniel 46: #define XPATH_USERS 5
1.1 daniel 47:
48: typedef struct xmlXPathObject {
49: int type;
50: xmlNodeSetPtr nodesetval;
51: int boolval;
1.6 daniel 52: double floatval;
1.10 daniel 53: xmlChar *stringval;
1.9 daniel 54: void *user;
1.1 daniel 55: } xmlXPathObject, *xmlXPathObjectPtr;
56:
1.9 daniel 57: /*
58: * A conversion function is associated to a type and used to cast
59: * the new type to primitive values.
60: */
61: typedef int (*xmlXPathConvertFunc) (xmlXPathObjectPtr obj, int type);
62:
63: /*
64: * Extra type: a name and a conversion function.
65: */
66:
67: typedef struct xmlXPathType {
1.10 daniel 68: const xmlChar *name; /* the type name */
1.9 daniel 69: xmlXPathConvertFunc func; /* the conversion function */
70: } xmlXPathType, *xmlXPathTypePtr;
71:
72: /*
73: * Extra variable: a name and a value.
74: */
75:
76: typedef struct xmlXPathVariable {
1.10 daniel 77: const xmlChar *name; /* the variable name */
1.9 daniel 78: xmlXPathObjectPtr value; /* the value */
79: } xmlXPathVariable, *xmlXPathVariablePtr;
80:
81: /*
82: * an evaluation function, the parameters are on the context stack
83: */
84:
85: typedef void (*xmlXPathEvalFunc)(xmlXPathParserContextPtr ctxt, int nargs);
86:
87: /*
88: * Extra function: a name and a evaluation function.
89: */
90:
91: typedef struct xmlXPathFunct {
1.10 daniel 92: const xmlChar *name; /* the function name */
1.9 daniel 93: xmlXPathEvalFunc func; /* the evaluation function */
94: } xmlXPathFunc, *xmlXPathFuncPtr;
95:
96: /*
97: * An axis traversal function. To traverse an axis, the engine calls
98: * the first time with cur == NULL and repeat until the function returns
99: * NULL indicating the end of the axis traversal.
100: */
101:
102: typedef xmlXPathObjectPtr (*xmlXPathAxisFunc) (xmlXPathParserContextPtr ctxt,
103: xmlXPathObjectPtr cur);
104:
105: /*
106: * Extra axis: a name and an axis function.
107: */
108:
109: typedef struct xmlXPathAxis {
1.10 daniel 110: const xmlChar *name; /* the axis name */
1.9 daniel 111: xmlXPathAxisFunc func; /* the search function */
112: } xmlXPathAxis, *xmlXPathAxisPtr;
113:
1.1 daniel 114: /*
115: * Expression evaluation occurs with respect to a context.
116: * he context consists of:
117: * - a node (the context node)
118: * - a node list (the context node list)
119: * - a set of variable bindings
120: * - a function library
121: * - the set of namespace declarations in scope for the expression
122: */
123:
124: typedef struct xmlXPathContext {
1.2 daniel 125: xmlDocPtr doc; /* The current document */
126: xmlNodePtr node; /* The current node */
127: xmlNodeSetPtr nodelist; /* The current node list */
1.9 daniel 128:
129: int nb_variables; /* number of defined variables */
130: int max_variables; /* max number of variables */
131: xmlXPathVariablePtr *variables; /* Array of defined variables */
132:
133: int nb_types; /* number of defined types */
134: int max_types; /* max number of types */
135: xmlXPathTypePtr *types; /* Array of defined types */
136:
137: int nb_funcs; /* number of defined funcs */
138: int max_funcs; /* max number of funcs */
139: xmlXPathFuncPtr *funcs; /* Array of defined funcs */
140:
141: int nb_axis; /* number of defined axis */
142: int max_axis; /* max number of axis */
143: xmlXPathAxisPtr *axis; /* Array of defined axis */
144:
145: /* Namespace traversal should be implemented with user */
1.8 daniel 146: xmlNsPtr *namespaces; /* The namespaces lookup */
147: int nsNr; /* the current Namespace index */
1.9 daniel 148: void *user; /* user defined extra info */
1.1 daniel 149: } xmlXPathContext, *xmlXPathContextPtr;
150:
151: /*
152: * An XPath parser context, it contains pure parsing informations,
153: * an xmlXPathContext, and the stack of objects.
154: */
155: typedef struct xmlXPathParserContext {
1.10 daniel 156: const xmlChar *cur; /* the current char being parsed */
157: const xmlChar *base; /* the full expression */
1.1 daniel 158:
159: int error; /* error code */
160:
161: xmlXPathContextPtr context; /* the evaluation context */
162: xmlXPathObjectPtr value; /* the current value */
163: int valueNr; /* number of values stacked */
164: int valueMax; /* max number of values stacked */
165: xmlXPathObjectPtr *valueTab; /* stack of values */
1.9 daniel 166: } xmlXPathParserContext;
1.1 daniel 167:
168: /*
169: * An XPath function
170: * The arguments (if any) are popped out of the context stack
171: * and the result is pushed on the stack.
172: */
173:
1.4 daniel 174: typedef void (*xmlXPathFunction) (xmlXPathParserContextPtr ctxt, int nargs);
1.1 daniel 175:
176: /************************************************************************
177: * *
178: * Public API *
179: * *
180: ************************************************************************/
181:
1.9 daniel 182: /**
183: * Registering extensions to the expression language
184: */
185: /* TODO */ int xmlXPathRegisterType (xmlXPathContextPtr ctxt,
1.10 daniel 186: const xmlChar *name,
1.9 daniel 187: xmlXPathConvertFunc f);
188: /* TODO */ int xmlXPathRegisterAxis (xmlXPathContextPtr ctxt,
1.10 daniel 189: const xmlChar *name,
1.9 daniel 190: xmlXPathAxisFunc f);
191: /* TODO */ int xmlXPathRegisterFunc (xmlXPathContextPtr ctxt,
1.10 daniel 192: const xmlChar *name,
1.9 daniel 193: xmlXPathFunction f);
194: /* TODO */ int xmlXPathRegisterVariable (xmlXPathContextPtr ctxt,
1.10 daniel 195: const xmlChar *name,
1.9 daniel 196: xmlXPathObject value);
197:
198: /**
199: * Evaluation functions.
200: */
201: xmlXPathContextPtr xmlXPathNewContext (xmlDocPtr doc);
1.8 daniel 202: void xmlXPathFreeContext (xmlXPathContextPtr ctxt);
1.10 daniel 203: xmlXPathObjectPtr xmlXPathEval (const xmlChar *str,
1.8 daniel 204: xmlXPathContextPtr ctxt);
205: void xmlXPathFreeObject (xmlXPathObjectPtr obj);
1.10 daniel 206: xmlXPathObjectPtr xmlXPathEvalExpression (const xmlChar *str,
1.8 daniel 207: xmlXPathContextPtr ctxt);
1.3 daniel 208:
1.11 daniel 209: #ifdef __cplusplus
210: }
211: #endif
1.1 daniel 212: #endif /* ! __XML_XPATH_H__ */
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