1 /* Helper routines for parsing XML using Expat.
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
27 #include "gdb_obstack.h"
30 struct gdb_xml_parser;
31 struct gdb_xml_element;
32 struct gdb_xml_attribute;
34 /* A name and value pair, used to record parsed attributes. */
41 typedef struct gdb_xml_value gdb_xml_value_s;
42 DEF_VEC_O(gdb_xml_value_s);
44 /* The type of an attribute handler.
46 PARSER is the current XML parser, which should be used to issue any
47 debugging or error messages. The second argument is the
48 corresponding attribute description, so that a single handler can
49 be used for multiple attributes; the attribute name is available
50 for error messages and the handler data is available for additional
51 customization (see gdb_xml_parse_attr_enum). VALUE is the string
52 value of the attribute.
54 The returned value should be freeable with xfree, and will be freed
55 after the start handler is called. Errors should be reported by
56 calling gdb_xml_error. */
58 typedef void *(gdb_xml_attribute_handler) (struct gdb_xml_parser *parser,
59 const struct gdb_xml_attribute *,
62 /* Flags for attributes. If no flags are specified, the attribute is
65 enum gdb_xml_attribute_flag
68 GDB_XML_AF_OPTIONAL = 1 << 0, /* The attribute is optional. */
71 /* An expected attribute and the handler to call when it is
72 encountered. Arrays of struct gdb_xml_attribute are terminated
73 by an entry with NAME == NULL. */
75 struct gdb_xml_attribute
79 gdb_xml_attribute_handler *handler;
80 const void *handler_data;
83 /* Flags for elements. If no flags are specified, the element is
84 required exactly once. */
86 enum gdb_xml_element_flag
89 GDB_XML_EF_OPTIONAL = 1 << 0, /* The element is optional. */
90 GDB_XML_EF_REPEATABLE = 1 << 1, /* The element is repeatable. */
93 /* A handler called at the beginning of an element.
95 PARSER is the current XML parser, which should be used to issue any
96 debugging or error messages. ELEMENT is the current element.
97 USER_DATA is the opaque pointer supplied when the parser was
98 created. ATTRIBUTES is a vector of the values of any attributes
99 attached to this element.
101 The start handler will only be called if all the required
102 attributes were present and parsed successfully, and elements of
103 ATTRIBUTES are guaranteed to be in the same order used in
104 ELEMENT->ATTRIBUTES (not the order from the XML file). Accordingly
105 fixed offsets can be used to find any non-optional attributes as
106 long as no optional attributes precede them. */
108 typedef void (gdb_xml_element_start_handler)
109 (struct gdb_xml_parser *parser, const struct gdb_xml_element *element,
110 void *user_data, VEC(gdb_xml_value_s) *attributes);
112 /* A handler called at the end of an element.
114 PARSER, ELEMENT, and USER_DATA are as for the start handler. BODY
115 is any accumulated body text inside the element, with leading and
116 trailing whitespace removed. It will never be NULL. */
118 typedef void (gdb_xml_element_end_handler)
119 (struct gdb_xml_parser *, const struct gdb_xml_element *,
120 void *user_data, const char *body_text);
122 /* An expected element and the handlers to call when it is
123 encountered. Arrays of struct gdb_xml_element are terminated
124 by an entry with NAME == NULL. */
126 struct gdb_xml_element
129 const struct gdb_xml_attribute *attributes;
130 const struct gdb_xml_element *children;
133 gdb_xml_element_start_handler *start_handler;
134 gdb_xml_element_end_handler *end_handler;
137 /* Initialize and return a parser. Register a cleanup to destroy the
140 struct gdb_xml_parser *gdb_xml_create_parser_and_cleanup
141 (const char *name, const struct gdb_xml_element *elements,
144 /* Invoke PARSER on BUFFER. BUFFER is the data to parse, which
145 should be NUL-terminated.
147 The return value is 0 for success or -1 for error. It may throw,
148 but only if something unexpected goes wrong during parsing; parse
149 errors will be caught, warned about, and reported as failure. */
151 int gdb_xml_parse (struct gdb_xml_parser *parser, const char *buffer);
153 /* Issue a debugging message from one of PARSER's handlers. */
155 void gdb_xml_debug (struct gdb_xml_parser *parser, const char *format, ...)
156 ATTR_FORMAT (printf, 2, 0);
158 /* Issue an error message from one of PARSER's handlers, and stop
161 void gdb_xml_error (struct gdb_xml_parser *parser, const char *format, ...)
162 ATTR_NORETURN ATTR_FORMAT (printf, 2, 0);
164 /* Parse an integer attribute into a ULONGEST. */
166 extern gdb_xml_attribute_handler gdb_xml_parse_attr_ulongest;
168 /* Map NAME to VALUE. A struct gdb_xml_enum * should be saved as the
169 value of handler_data when using gdb_xml_parse_attr_enum to parse a
170 fixed list of possible strings. The list is terminated by an entry
171 with NAME == NULL. */
179 extern gdb_xml_attribute_handler gdb_xml_parse_attr_enum;
181 /* Parse an integer string into a ULONGEST and return it, or call
182 gdb_xml_error if it could not be parsed. */
184 ULONGEST gdb_xml_parse_ulongest (struct gdb_xml_parser *parser,