242 lines
8.0 KiB
C++
242 lines
8.0 KiB
C++
/* Helper routines for parsing XML using Expat.
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Copyright (C) 2006-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef XML_SUPPORT_H
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#define XML_SUPPORT_H
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#include "gdb_obstack.h"
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#include "vec.h"
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#include "xml-utils.h"
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#include "common/byte-vector.h"
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struct gdb_xml_parser;
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struct gdb_xml_element;
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struct gdb_xml_attribute;
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/* Return an XML document which was compiled into GDB, from
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the given FILENAME, or NULL if the file was not compiled in. */
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const char *fetch_xml_builtin (const char *filename);
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/* A to_xfer_partial helper function which reads XML files which were
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compiled into GDB. The target may call this function from its own
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to_xfer_partial handler, after converting object and annex to the
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appropriate filename. */
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LONGEST xml_builtin_xfer_partial (const char *filename,
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gdb_byte *readbuf, const gdb_byte *writebuf,
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ULONGEST offset, LONGEST len);
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/* The text of compiled-in XML documents, from xml-builtin.c
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(generated). */
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extern const char *xml_builtin[][2];
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/* Support for XInclude. */
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/* Callback to fetch a new XML file, based on the provided HREF. */
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typedef gdb::optional<gdb::char_vector> (*xml_fetch_another) (const char *href,
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void *baton);
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/* Append the expansion of TEXT after processing <xi:include> tags in
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RESULT. FETCHER will be called (with FETCHER_BATON) to retrieve
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any new files. DEPTH should be zero on the initial call.
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On failure, this function uses NAME in a warning and returns false.
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It may throw an exception, but does not for XML parsing
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problems. */
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bool xml_process_xincludes (std::string &result,
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const char *name, const char *text,
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xml_fetch_another fetcher, void *fetcher_baton,
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int depth);
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/* Simplified XML parser infrastructure. */
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/* A name and value pair, used to record parsed attributes. */
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struct gdb_xml_value
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{
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gdb_xml_value (const char *name_, void *value_)
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: name (name_), value (value_)
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{}
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const char *name;
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gdb::unique_xmalloc_ptr<void> value;
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};
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/* The type of an attribute handler.
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PARSER is the current XML parser, which should be used to issue any
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debugging or error messages. The second argument is the
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corresponding attribute description, so that a single handler can
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be used for multiple attributes; the attribute name is available
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for error messages and the handler data is available for additional
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customization (see gdb_xml_parse_attr_enum). VALUE is the string
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value of the attribute.
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The returned value should be freeable with xfree, and will be freed
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after the start handler is called. Errors should be reported by
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calling gdb_xml_error. */
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typedef void *(gdb_xml_attribute_handler) (struct gdb_xml_parser *parser,
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const struct gdb_xml_attribute *,
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const char *value);
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/* Flags for attributes. If no flags are specified, the attribute is
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required. */
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enum gdb_xml_attribute_flag
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{
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GDB_XML_AF_NONE,
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GDB_XML_AF_OPTIONAL = 1 << 0, /* The attribute is optional. */
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};
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/* An expected attribute and the handler to call when it is
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encountered. Arrays of struct gdb_xml_attribute are terminated
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by an entry with NAME == NULL. */
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struct gdb_xml_attribute
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{
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const char *name;
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int flags;
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gdb_xml_attribute_handler *handler;
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const void *handler_data;
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};
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/* Flags for elements. If no flags are specified, the element is
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required exactly once. */
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enum gdb_xml_element_flag
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{
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GDB_XML_EF_NONE,
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GDB_XML_EF_OPTIONAL = 1 << 0, /* The element is optional. */
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GDB_XML_EF_REPEATABLE = 1 << 1, /* The element is repeatable. */
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};
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/* A handler called at the beginning of an element.
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PARSER is the current XML parser, which should be used to issue any
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debugging or error messages. ELEMENT is the current element.
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USER_DATA is the opaque pointer supplied when the parser was
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created. ATTRIBUTES is a vector of the values of any attributes
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attached to this element.
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The start handler will only be called if all the required
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attributes were present and parsed successfully, and elements of
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ATTRIBUTES are guaranteed to be in the same order used in
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ELEMENT->ATTRIBUTES (not the order from the XML file). Accordingly
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fixed offsets can be used to find any non-optional attributes as
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long as no optional attributes precede them. */
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typedef void (gdb_xml_element_start_handler)
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(struct gdb_xml_parser *parser, const struct gdb_xml_element *element,
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void *user_data, std::vector<gdb_xml_value> &attributes);
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/* A handler called at the end of an element.
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PARSER, ELEMENT, and USER_DATA are as for the start handler. BODY
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is any accumulated body text inside the element, with leading and
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trailing whitespace removed. It will never be NULL. */
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typedef void (gdb_xml_element_end_handler)
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(struct gdb_xml_parser *, const struct gdb_xml_element *,
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void *user_data, const char *body_text);
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/* An expected element and the handlers to call when it is
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encountered. Arrays of struct gdb_xml_element are terminated
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by an entry with NAME == NULL. */
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struct gdb_xml_element
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{
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const char *name;
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const struct gdb_xml_attribute *attributes;
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const struct gdb_xml_element *children;
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int flags;
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gdb_xml_element_start_handler *start_handler;
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gdb_xml_element_end_handler *end_handler;
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};
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/* Parse a XML document. DOCUMENT is the data to parse, which should
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be NUL-terminated. If non-NULL, use the compiled-in DTD named
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DTD_NAME to drive the parsing.
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The return value is 0 for success or -1 for error. It may throw,
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but only if something unexpected goes wrong during parsing; parse
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errors will be caught, warned about, and reported as failure. */
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int gdb_xml_parse_quick (const char *name, const char *dtd_name,
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const struct gdb_xml_element *elements,
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const char *document, void *user_data);
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/* Issue a debugging message from one of PARSER's handlers. */
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void gdb_xml_debug (struct gdb_xml_parser *parser, const char *format, ...)
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ATTRIBUTE_PRINTF (2, 3);
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/* Issue an error message from one of PARSER's handlers, and stop
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parsing. */
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void gdb_xml_error (struct gdb_xml_parser *parser, const char *format, ...)
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ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 3);
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/* Find the attribute named NAME in the set of parsed attributes
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ATTRIBUTES. Returns NULL if not found. */
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struct gdb_xml_value *xml_find_attribute
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(std::vector<gdb_xml_value> &attributes, const char *name);
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/* Parse an integer attribute into a ULONGEST. */
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extern gdb_xml_attribute_handler gdb_xml_parse_attr_ulongest;
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/* Map NAME to VALUE. A struct gdb_xml_enum * should be saved as the
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value of handler_data when using gdb_xml_parse_attr_enum to parse a
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fixed list of possible strings. The list is terminated by an entry
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with NAME == NULL. */
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struct gdb_xml_enum
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{
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const char *name;
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ULONGEST value;
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};
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/* A handler_data for yes/no boolean values. */
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extern const struct gdb_xml_enum gdb_xml_enums_boolean[];
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extern gdb_xml_attribute_handler gdb_xml_parse_attr_enum;
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/* Parse an integer string into a ULONGEST and return it, or call
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gdb_xml_error if it could not be parsed. */
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ULONGEST gdb_xml_parse_ulongest (struct gdb_xml_parser *parser,
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const char *value);
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/* Open FILENAME, read all its text into memory, close it, and return
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the text. If something goes wrong, return an uninstantiated optional
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and warn. */
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extern gdb::optional<gdb::char_vector> xml_fetch_content_from_file
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(const char *filename, void *baton);
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#endif
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