/* Helper routines for parsing XML using Expat.
- Copyright (C) 2006
- Free Software Foundation, Inc.
+ Copyright (C) 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
Boston, MA 02110-1301, USA. */
#include "defs.h"
+#include "gdbcmd.h"
+
+/* Debugging flag. */
+static int debug_xml;
/* The contents of this file are only useful if XML support is
available. */
#include "exceptions.h"
#include "xml-support.h"
-#include <expat.h>
-
+#include "gdb_expat.h"
#include "gdb_string.h"
+#include "safe-ctype.h"
+
+/* The maximum depth of <xi:include> nesting. No need to be miserly,
+ we just want to avoid running out of stack on loops. */
+#define MAX_XINCLUDE_DEPTH 30
+
+/* A parsing level -- used to keep track of the current element
+ nesting. */
+struct scope_level
+{
+ /* Elements we allow at this level. */
+ const struct gdb_xml_element *elements;
+
+ /* The element which we are within. */
+ const struct gdb_xml_element *element;
+
+ /* Mask of which elements we've seen at this level (used for
+ optional and repeatable checking). */
+ unsigned int seen;
+
+ /* Body text accumulation. */
+ struct obstack *body;
+};
+typedef struct scope_level scope_level_s;
+DEF_VEC_O(scope_level_s);
+
+/* The parser itself, and our additional state. */
+struct gdb_xml_parser
+{
+ XML_Parser expat_parser; /* The underlying expat parser. */
+
+ const char *name; /* Name of this parser. */
+ void *user_data; /* The user's callback data, for handlers. */
+
+ VEC(scope_level_s) *scopes; /* Scoping stack. */
+
+ struct gdb_exception error; /* A thrown error, if any. */
+ int last_line; /* The line of the thrown error, or 0. */
+
+ const char *dtd_name; /* The name of the expected / default DTD,
+ if specified. */
+ int is_xinclude; /* Are we the special <xi:include> parser? */
+};
+
+/* Process some body text. We accumulate the text for later use; it's
+ wrong to do anything with it immediately, because a single block of
+ text might be broken up into multiple calls to this function. */
+
+static void
+gdb_xml_body_text (void *data, const XML_Char *text, int length)
+{
+ struct gdb_xml_parser *parser = data;
+ struct scope_level *scope = VEC_last (scope_level_s, parser->scopes);
+
+ if (parser->error.reason < 0)
+ return;
+
+ if (scope->body == NULL)
+ {
+ scope->body = XZALLOC (struct obstack);
+ obstack_init (scope->body);
+ }
+
+ obstack_grow (scope->body, text, length);
+}
+
+/* Issue a debugging message from one of PARSER's handlers. */
+
+void
+gdb_xml_debug (struct gdb_xml_parser *parser, const char *format, ...)
+{
+ int line = XML_GetCurrentLineNumber (parser->expat_parser);
+ va_list ap;
+ char *message;
+
+ if (!debug_xml)
+ return;
+
+ va_start (ap, format);
+ message = xstrvprintf (format, ap);
+ if (line)
+ fprintf_unfiltered (gdb_stderr, "%s (line %d): %s\n",
+ parser->name, line, message);
+ else
+ fprintf_unfiltered (gdb_stderr, "%s: %s\n",
+ parser->name, message);
+ xfree (message);
+}
+
+/* Issue an error message from one of PARSER's handlers, and stop
+ parsing. */
+
+void
+gdb_xml_error (struct gdb_xml_parser *parser, const char *format, ...)
+{
+ int line = XML_GetCurrentLineNumber (parser->expat_parser);
+ va_list ap;
+
+ parser->last_line = line;
+ va_start (ap, format);
+ throw_verror (XML_PARSE_ERROR, format, ap);
+}
+
+/* Clean up a vector of parsed attribute values. */
+
+static void
+gdb_xml_values_cleanup (void *data)
+{
+ VEC(gdb_xml_value_s) **values = data;
+ struct gdb_xml_value *value;
+ int ix;
+
+ for (ix = 0; VEC_iterate (gdb_xml_value_s, *values, ix, value); ix++)
+ xfree (value->value);
+ VEC_free (gdb_xml_value_s, *values);
+}
+
+/* Handle the start of an element. DATA is our local XML parser, NAME
+ is the element, and ATTRS are the names and values of this
+ element's attributes. */
+
+static void
+gdb_xml_start_element (void *data, const XML_Char *name,
+ const XML_Char **attrs)
+{
+ struct gdb_xml_parser *parser = data;
+ struct scope_level *scope;
+ struct scope_level new_scope;
+ const struct gdb_xml_element *element;
+ const struct gdb_xml_attribute *attribute;
+ VEC(gdb_xml_value_s) *attributes = NULL;
+ unsigned int seen;
+ struct cleanup *back_to;
+
+ /* Push an error scope. If we return or throw an exception before
+ filling this in, it will tell us to ignore children of this
+ element. */
+ VEC_reserve (scope_level_s, parser->scopes, 1);
+ scope = VEC_last (scope_level_s, parser->scopes);
+ memset (&new_scope, 0, sizeof (new_scope));
+ VEC_quick_push (scope_level_s, parser->scopes, &new_scope);
+
+ gdb_xml_debug (parser, _("Entering element <%s>"), name);
+
+ /* Find this element in the list of the current scope's allowed
+ children. Record that we've seen it. */
+
+ seen = 1;
+ for (element = scope->elements; element && element->name;
+ element++, seen <<= 1)
+ if (strcmp (element->name, name) == 0)
+ break;
+
+ if (element == NULL || element->name == NULL)
+ {
+ /* If we're working on XInclude, <xi:include> can be the child
+ of absolutely anything. Copy the previous scope's element
+ list into the new scope even if there was no match. */
+ if (parser->is_xinclude)
+ {
+ struct scope_level *unknown_scope;
+
+ XML_DefaultCurrent (parser->expat_parser);
+
+ unknown_scope = VEC_last (scope_level_s, parser->scopes);
+ unknown_scope->elements = scope->elements;
+ return;
+ }
+
+ gdb_xml_debug (parser, _("Element <%s> unknown"), name);
+ return;
+ }
+
+ if (!(element->flags & GDB_XML_EF_REPEATABLE) && (seen & scope->seen))
+ gdb_xml_error (parser, _("Element <%s> only expected once"), name);
+
+ scope->seen |= seen;
+
+ back_to = make_cleanup (gdb_xml_values_cleanup, &attributes);
+
+ for (attribute = element->attributes;
+ attribute != NULL && attribute->name != NULL;
+ attribute++)
+ {
+ const char *val = NULL;
+ const XML_Char **p;
+ void *parsed_value;
+ struct gdb_xml_value new_value;
+
+ for (p = attrs; *p != NULL; p += 2)
+ if (!strcmp (attribute->name, p[0]))
+ {
+ val = p[1];
+ break;
+ }
+
+ if (*p != NULL && val == NULL)
+ {
+ gdb_xml_debug (parser, _("Attribute \"%s\" missing a value"),
+ attribute->name);
+ continue;
+ }
-/* Returns the value of attribute ATTR from expat attribute list
- ATTRLIST. If not found, throws an exception. */
+ if (*p == NULL && !(attribute->flags & GDB_XML_AF_OPTIONAL))
+ {
+ gdb_xml_error (parser, _("Required attribute \"%s\" of "
+ "<%s> not specified"),
+ attribute->name, element->name);
+ continue;
+ }
-const XML_Char *
-xml_get_required_attribute (const XML_Char **attrs,
- const XML_Char *attr)
+ if (*p == NULL)
+ continue;
+
+ gdb_xml_debug (parser, _("Parsing attribute %s=\"%s\""),
+ attribute->name, val);
+
+ if (attribute->handler)
+ parsed_value = attribute->handler (parser, attribute, val);
+ else
+ parsed_value = xstrdup (val);
+
+ new_value.name = attribute->name;
+ new_value.value = parsed_value;
+ VEC_safe_push (gdb_xml_value_s, attributes, &new_value);
+ }
+
+ /* Check for unrecognized attributes. */
+ if (debug_xml)
+ {
+ const XML_Char **p;
+
+ for (p = attrs; *p != NULL; p += 2)
+ {
+ for (attribute = element->attributes;
+ attribute != NULL && attribute->name != NULL;
+ attribute++)
+ if (strcmp (attribute->name, *p) == 0)
+ break;
+
+ if (attribute == NULL || attribute->name == NULL)
+ gdb_xml_debug (parser, _("Ignoring unknown attribute %s"), *p);
+ }
+ }
+
+ /* Call the element handler if there is one. */
+ if (element->start_handler)
+ element->start_handler (parser, element, parser->user_data, attributes);
+
+ /* Fill in a new scope level. */
+ scope = VEC_last (scope_level_s, parser->scopes);
+ scope->element = element;
+ scope->elements = element->children;
+
+ do_cleanups (back_to);
+}
+
+/* Wrapper for gdb_xml_start_element, to prevent throwing exceptions
+ through expat. */
+
+static void
+gdb_xml_start_element_wrapper (void *data, const XML_Char *name,
+ const XML_Char **attrs)
{
- const XML_Char **p;
- for (p = attrs; *p; p += 2)
+ struct gdb_xml_parser *parser = data;
+ volatile struct gdb_exception ex;
+
+ if (parser->error.reason < 0)
+ return;
+
+ TRY_CATCH (ex, RETURN_MASK_ALL)
+ {
+ gdb_xml_start_element (data, name, attrs);
+ }
+ if (ex.reason < 0)
+ {
+ parser->error = ex;
+#ifdef HAVE_XML_STOPPARSER
+ XML_StopParser (parser->expat_parser, XML_FALSE);
+#endif
+ }
+}
+
+/* Handle the end of an element. DATA is our local XML parser, and
+ NAME is the current element. */
+
+static void
+gdb_xml_end_element (void *data, const XML_Char *name)
+{
+ struct gdb_xml_parser *parser = data;
+ struct scope_level *scope = VEC_last (scope_level_s, parser->scopes);
+ const struct gdb_xml_element *element;
+ unsigned int seen;
+
+ gdb_xml_debug (parser, _("Leaving element <%s>"), name);
+
+ for (element = scope->elements, seen = 1;
+ element != NULL && element->name != NULL;
+ element++, seen <<= 1)
+ if ((scope->seen & seen) == 0
+ && (element->flags & GDB_XML_EF_OPTIONAL) == 0)
+ gdb_xml_error (parser, _("Required element <%s> is missing"),
+ element->name);
+
+ /* Call the element processor. */
+ if (scope->element != NULL && scope->element->end_handler)
+ {
+ char *body;
+
+ if (scope->body == NULL)
+ body = "";
+ else
+ {
+ int length;
+
+ length = obstack_object_size (scope->body);
+ obstack_1grow (scope->body, '\0');
+ body = obstack_finish (scope->body);
+
+ /* Strip leading and trailing whitespace. */
+ while (length > 0 && ISSPACE (body[length-1]))
+ body[--length] = '\0';
+ while (*body && ISSPACE (*body))
+ body++;
+ }
+
+ scope->element->end_handler (parser, scope->element, parser->user_data,
+ body);
+ }
+ else if (scope->element == NULL)
+ XML_DefaultCurrent (parser->expat_parser);
+
+ /* Pop the scope level. */
+ if (scope->body)
{
- const char *name = p[0];
- const char *val = p[1];
+ obstack_free (scope->body, NULL);
+ xfree (scope->body);
+ }
+ VEC_pop (scope_level_s, parser->scopes);
+}
+
+/* Wrapper for gdb_xml_end_element, to prevent throwing exceptions
+ through expat. */
- if (strcmp (name, attr) == 0)
- return val;
+static void
+gdb_xml_end_element_wrapper (void *data, const XML_Char *name)
+{
+ struct gdb_xml_parser *parser = data;
+ volatile struct gdb_exception ex;
+
+ if (parser->error.reason < 0)
+ return;
+
+ TRY_CATCH (ex, RETURN_MASK_ALL)
+ {
+ gdb_xml_end_element (data, name);
+ }
+ if (ex.reason < 0)
+ {
+ parser->error = ex;
+#ifdef HAVE_XML_STOPPARSER
+ XML_StopParser (parser->expat_parser, XML_FALSE);
+#endif
}
- throw_error (XML_PARSE_ERROR, _("Can't find attribute %s"), attr);
+}
+
+/* Free a parser and all its associated state. */
+
+static void
+gdb_xml_cleanup (void *arg)
+{
+ struct gdb_xml_parser *parser = arg;
+ struct scope_level *scope;
+ int ix;
+
+ XML_ParserFree (parser->expat_parser);
+
+ /* Clean up the scopes. */
+ for (ix = 0; VEC_iterate (scope_level_s, parser->scopes, ix, scope); ix++)
+ if (scope->body)
+ {
+ obstack_free (scope->body, NULL);
+ xfree (scope->body);
+ }
+ VEC_free (scope_level_s, parser->scopes);
+
+ xfree (parser);
+}
+
+/* Initialize and return a parser. Register a cleanup to destroy the
+ parser. */
+
+struct gdb_xml_parser *
+gdb_xml_create_parser_and_cleanup (const char *name,
+ const struct gdb_xml_element *elements,
+ void *user_data)
+{
+ struct gdb_xml_parser *parser;
+ struct scope_level start_scope;
+
+ /* Initialize the parser. */
+ parser = XZALLOC (struct gdb_xml_parser);
+ parser->expat_parser = XML_ParserCreateNS (NULL, '!');
+ if (parser->expat_parser == NULL)
+ {
+ xfree (parser);
+ nomem (0);
+ }
+
+ parser->name = name;
+
+ parser->user_data = user_data;
+ XML_SetUserData (parser->expat_parser, parser);
+
+ /* Set the callbacks. */
+ XML_SetElementHandler (parser->expat_parser, gdb_xml_start_element_wrapper,
+ gdb_xml_end_element_wrapper);
+ XML_SetCharacterDataHandler (parser->expat_parser, gdb_xml_body_text);
+
+ /* Initialize the outer scope. */
+ memset (&start_scope, 0, sizeof (start_scope));
+ start_scope.elements = elements;
+ VEC_safe_push (scope_level_s, parser->scopes, &start_scope);
+
+ make_cleanup (gdb_xml_cleanup, parser);
+
+ return parser;
+}
+
+/* External entity handler. The only external entities we support
+ are those compiled into GDB (we do not fetch entities from the
+ target). */
+
+static int XMLCALL
+gdb_xml_fetch_external_entity (XML_Parser expat_parser,
+ const XML_Char *context,
+ const XML_Char *base,
+ const XML_Char *systemId,
+ const XML_Char *publicId)
+{
+ struct gdb_xml_parser *parser = XML_GetUserData (expat_parser);
+ XML_Parser entity_parser;
+ const char *text;
+ enum XML_Status status;
+
+ if (systemId == NULL)
+ {
+ text = fetch_xml_builtin (parser->dtd_name);
+ if (text == NULL)
+ internal_error (__FILE__, __LINE__, "could not locate built-in DTD %s",
+ parser->dtd_name);
+ }
+ else
+ {
+ text = fetch_xml_builtin (systemId);
+ if (text == NULL)
+ return XML_STATUS_ERROR;
+ }
+
+ entity_parser = XML_ExternalEntityParserCreate (expat_parser, context, NULL);
+
+ /* Don't use our handlers for the contents of the DTD. Just let expat
+ process it. */
+ XML_SetElementHandler (entity_parser, NULL, NULL);
+ XML_SetDoctypeDeclHandler (entity_parser, NULL, NULL);
+ XML_SetXmlDeclHandler (entity_parser, NULL);
+ XML_SetDefaultHandler (entity_parser, NULL);
+ XML_SetUserData (entity_parser, NULL);
+
+ status = XML_Parse (entity_parser, text, strlen (text), 1);
+
+ XML_ParserFree (entity_parser);
+ return status;
+}
+
+/* Associate DTD_NAME, which must be the name of a compiled-in DTD,
+ with PARSER. */
+
+void
+gdb_xml_use_dtd (struct gdb_xml_parser *parser, const char *dtd_name)
+{
+ enum XML_Error err;
+
+ parser->dtd_name = dtd_name;
+
+ XML_SetParamEntityParsing (parser->expat_parser,
+ XML_PARAM_ENTITY_PARSING_UNLESS_STANDALONE);
+ XML_SetExternalEntityRefHandler (parser->expat_parser,
+ gdb_xml_fetch_external_entity);
+
+ /* Even if no DTD is provided, use the built-in DTD anyway. */
+ err = XML_UseForeignDTD (parser->expat_parser, XML_TRUE);
+ if (err != XML_ERROR_NONE)
+ internal_error (__FILE__, __LINE__,
+ "XML_UseForeignDTD failed: %s", XML_ErrorString (err));
+}
+
+/* Invoke PARSER on BUFFER. BUFFER is the data to parse, which
+ should be NUL-terminated.
+
+ The return value is 0 for success or -1 for error. It may throw,
+ but only if something unexpected goes wrong during parsing; parse
+ errors will be caught, warned about, and reported as failure. */
+
+int
+gdb_xml_parse (struct gdb_xml_parser *parser, const char *buffer)
+{
+ enum XML_Status status;
+ const char *error_string;
+
+ status = XML_Parse (parser->expat_parser, buffer, strlen (buffer), 1);
+
+ if (status == XML_STATUS_OK && parser->error.reason == 0)
+ return 0;
+
+ if (parser->error.reason == RETURN_ERROR
+ && parser->error.error == XML_PARSE_ERROR)
+ {
+ gdb_assert (parser->error.message != NULL);
+ error_string = parser->error.message;
+ }
+ else if (status == XML_STATUS_ERROR)
+ {
+ enum XML_Error err = XML_GetErrorCode (parser->expat_parser);
+ error_string = XML_ErrorString (err);
+ }
+ else
+ {
+ gdb_assert (parser->error.reason < 0);
+ throw_exception (parser->error);
+ }
+
+ if (parser->last_line != 0)
+ warning (_("while parsing %s (at line %d): %s"), parser->name,
+ parser->last_line, error_string);
+ else
+ warning (_("while parsing %s: %s"), parser->name, error_string);
+
+ return -1;
}
/* Parse a field VALSTR that we expect to contain an integer value.
return 0;
}
-/* Gets the value of an integer attribute named ATTR, if it's present.
- If the attribute is not found, or can't be parsed as integer,
- throws an exception. */
+/* Parse an integer string into a ULONGEST and return it, or call
+ gdb_xml_error if it could not be parsed. */
ULONGEST
-xml_get_integer_attribute (const XML_Char **attrs,
- const XML_Char *attr)
+gdb_xml_parse_ulongest (struct gdb_xml_parser *parser, const char *value)
{
ULONGEST result;
- const XML_Char *value = xml_get_required_attribute (attrs, attr);
if (xml_parse_unsigned_integer (value, &result) != 0)
- {
- throw_error (XML_PARSE_ERROR,
- _("Can't convert value of attribute %s, %s, to integer"),
- attr, value);
- }
+ gdb_xml_error (parser, _("Can't convert \"%s\" to an integer"), value);
+
return result;
}
-/* Obtains a value of attribute with enumerated type. In XML, enumerated
- attributes have string as a value, and in C, they are represented as
- values of enumerated type. This function maps the attribute onto
- an integer value that can be immediately converted into enumerated
- type.
+/* Parse an integer attribute into a ULONGEST. */
- First, obtains the string value of ATTR in ATTRS.
- Then, finds the index of that value in XML_NAMES, which is a zero-terminated
- array of strings. If found, returns the element of VALUES with that index.
- Otherwise throws. */
+void *
+gdb_xml_parse_attr_ulongest (struct gdb_xml_parser *parser,
+ const struct gdb_xml_attribute *attribute,
+ const char *value)
+{
+ ULONGEST result;
+ void *ret;
-int
-xml_get_enum_value (const XML_Char **attrs,
- const XML_Char *attr,
- const XML_Char **xml_names,
- int *values)
+ if (xml_parse_unsigned_integer (value, &result) != 0)
+ gdb_xml_error (parser, _("Can't convert %s=\"%s\" to an integer"),
+ attribute->name, value);
+
+ ret = xmalloc (sizeof (result));
+ memcpy (ret, &result, sizeof (result));
+ return ret;
+}
+
+/* Map NAME to VALUE. A struct gdb_xml_enum * should be saved as the
+ value of handler_data when using gdb_xml_parse_attr_enum to parse a
+ fixed list of possible strings. The list is terminated by an entry
+ with NAME == NULL. */
+
+void *
+gdb_xml_parse_attr_enum (struct gdb_xml_parser *parser,
+ const struct gdb_xml_attribute *attribute,
+ const char *value)
+{
+ const struct gdb_xml_enum *enums = attribute->handler_data;
+ void *ret;
+
+ for (enums = attribute->handler_data; enums->name != NULL; enums++)
+ if (strcmp (enums->name, value) == 0)
+ break;
+
+ if (enums->name == NULL)
+ gdb_xml_error (parser, _("Unknown attribute value %s=\"%s\""),
+ attribute->name, value);
+
+ ret = xmalloc (sizeof (enums->value));
+ memcpy (ret, &enums->value, sizeof (enums->value));
+ return ret;
+}
+\f
+
+/* XInclude processing. This is done as a separate step from actually
+ parsing the document, so that we can produce a single combined XML
+ document - e.g. to hand to a front end or to simplify comparing two
+ documents. We make extensive use of XML_DefaultCurrent, to pass
+ input text directly into the output without reformatting or
+ requoting it.
+
+ We output the DOCTYPE declaration for the first document unchanged,
+ if present, and discard DOCTYPEs from included documents. Only the
+ one we pass through here is used when we feed the result back to
+ expat. The XInclude standard explicitly does not discuss
+ validation of the result; we choose to apply the same DTD applied
+ to the outermost document.
+
+ We can not simply include the external DTD subset in the document
+ as an internal subset, because <!IGNORE> and <!INCLUDE> are valid
+ only in external subsets. But if we do not pass the DTD into the
+ output at all, default values will not be filled in.
+
+ We don't pass through any <?xml> declaration because we generate
+ UTF-8, not whatever the input encoding was. */
+
+struct xinclude_parsing_data
{
- const XML_Char *value = xml_get_required_attribute (attrs, attr);
+ /* The obstack to build the output in. */
+ struct obstack obstack;
+
+ /* A count indicating whether we are in an element whose
+ children should not be copied to the output, and if so,
+ how deep we are nested. This is used for anything inside
+ an xi:include, and for the DTD. */
+ int skip_depth;
- int i;
- for (i = 0; xml_names[i]; ++i)
+ /* The number of <xi:include> elements currently being processed,
+ to detect loops. */
+ int include_depth;
+
+ /* A function to call to obtain additional features, and its
+ baton. */
+ xml_fetch_another fetcher;
+ void *fetcher_baton;
+};
+
+static void
+xinclude_start_include (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data, VEC(gdb_xml_value_s) *attributes)
+{
+ struct xinclude_parsing_data *data = user_data;
+ char *href = VEC_index (gdb_xml_value_s, attributes, 0)->value;
+ struct cleanup *back_to;
+ char *text, *output;
+ int ret;
+
+ gdb_xml_debug (parser, _("Processing XInclude of \"%s\""), href);
+
+ if (data->include_depth > MAX_XINCLUDE_DEPTH)
+ gdb_xml_error (parser, _("Maximum XInclude depth (%d) exceeded"),
+ MAX_XINCLUDE_DEPTH);
+
+ text = data->fetcher (href, data->fetcher_baton);
+ if (text == NULL)
+ gdb_xml_error (parser, _("Could not load XML document \"%s\""), href);
+ back_to = make_cleanup (xfree, text);
+
+ output = xml_process_xincludes (parser->name, text, data->fetcher,
+ data->fetcher_baton,
+ data->include_depth + 1);
+ if (output == NULL)
+ gdb_xml_error (parser, _("Parsing \"%s\" failed"), href);
+
+ obstack_grow (&data->obstack, output, strlen (output));
+ xfree (output);
+
+ do_cleanups (back_to);
+
+ data->skip_depth++;
+}
+
+static void
+xinclude_end_include (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data, const char *body_text)
+{
+ struct xinclude_parsing_data *data = user_data;
+
+ data->skip_depth--;
+}
+
+static void XMLCALL
+xml_xinclude_default (void *data_, const XML_Char *s, int len)
+{
+ struct gdb_xml_parser *parser = data_;
+ struct xinclude_parsing_data *data = parser->user_data;
+
+ /* If we are inside of e.g. xi:include or the DTD, don't save this
+ string. */
+ if (data->skip_depth)
+ return;
+
+ /* Otherwise just add it to the end of the document we're building
+ up. */
+ obstack_grow (&data->obstack, s, len);
+}
+
+static void XMLCALL
+xml_xinclude_start_doctype (void *data_, const XML_Char *doctypeName,
+ const XML_Char *sysid, const XML_Char *pubid,
+ int has_internal_subset)
+{
+ struct gdb_xml_parser *parser = data_;
+ struct xinclude_parsing_data *data = parser->user_data;
+
+ /* Don't print out the doctype, or the contents of the DTD internal
+ subset, if any. */
+ data->skip_depth++;
+}
+
+static void XMLCALL
+xml_xinclude_end_doctype (void *data_)
+{
+ struct gdb_xml_parser *parser = data_;
+ struct xinclude_parsing_data *data = parser->user_data;
+
+ data->skip_depth--;
+}
+
+static void XMLCALL
+xml_xinclude_xml_decl (void *data_, const XML_Char *version,
+ const XML_Char *encoding, int standalone)
+{
+ /* Do nothing - this function prevents the default handler from
+ being called, thus suppressing the XML declaration from the
+ output. */
+}
+
+static void
+xml_xinclude_cleanup (void *data_)
+{
+ struct xinclude_parsing_data *data = data_;
+
+ obstack_free (&data->obstack, NULL);
+ xfree (data);
+}
+
+const struct gdb_xml_attribute xinclude_attributes[] = {
+ { "href", GDB_XML_AF_NONE, NULL, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+const struct gdb_xml_element xinclude_elements[] = {
+ { "http://www.w3.org/2001/XInclude!include", xinclude_attributes, NULL,
+ GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
+ xinclude_start_include, xinclude_end_include },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+/* The main entry point for <xi:include> processing. */
+
+char *
+xml_process_xincludes (const char *name, const char *text,
+ xml_fetch_another fetcher, void *fetcher_baton,
+ int depth)
+{
+ enum XML_Error err;
+ struct gdb_xml_parser *parser;
+ struct xinclude_parsing_data *data;
+ struct cleanup *back_to;
+ char *result = NULL;
+
+ data = XZALLOC (struct xinclude_parsing_data);
+ obstack_init (&data->obstack);
+ back_to = make_cleanup (xml_xinclude_cleanup, data);
+
+ parser = gdb_xml_create_parser_and_cleanup (name, xinclude_elements, data);
+ parser->is_xinclude = 1;
+
+ data->include_depth = depth;
+ data->fetcher = fetcher;
+ data->fetcher_baton = fetcher_baton;
+
+ XML_SetCharacterDataHandler (parser->expat_parser, NULL);
+ XML_SetDefaultHandler (parser->expat_parser, xml_xinclude_default);
+
+ /* Always discard the XML version declarations; the only important
+ thing this provides is encoding, and our result will have been
+ converted to UTF-8. */
+ XML_SetXmlDeclHandler (parser->expat_parser, xml_xinclude_xml_decl);
+
+ if (depth > 0)
+ /* Discard the doctype for included documents. */
+ XML_SetDoctypeDeclHandler (parser->expat_parser,
+ xml_xinclude_start_doctype,
+ xml_xinclude_end_doctype);
+
+ gdb_xml_use_dtd (parser, "xinclude.dtd");
+
+ if (gdb_xml_parse (parser, text) == 0)
{
- if (strcmp (xml_names[i], value) == 0)
- return values[i];
+ obstack_1grow (&data->obstack, '\0');
+ result = xstrdup (obstack_finish (&data->obstack));
+
+ if (depth == 0)
+ gdb_xml_debug (parser, _("XInclude processing succeeded:\n%s"),
+ result);
}
- throw_error (XML_PARSE_ERROR,
- _("Invalid enumerated value in XML: %s"), value);
+ else
+ result = NULL;
+
+ do_cleanups (back_to);
+ return result;
}
+\f
-/* Cleanup wrapper for XML_ParserFree, with the correct type
- for make_cleanup. */
+/* Return an XML document which was compiled into GDB, from
+ the given FILENAME, or NULL if the file was not compiled in. */
+
+const char *
+fetch_xml_builtin (const char *filename)
+{
+ const char *(*p)[2];
+
+ for (p = xml_builtin; (*p)[0]; p++)
+ if (strcmp ((*p)[0], filename) == 0)
+ return (*p)[1];
+
+ return NULL;
+}
+
+#endif /* HAVE_LIBEXPAT */
static void
-free_xml_parser (void *parser)
+show_debug_xml (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
{
- XML_ParserFree (parser);
+ fprintf_filtered (file, _("XML debugging is %s.\n"), value);
}
-/* Register a cleanup to release PARSER. Only the parser itself
- is freed; another cleanup may be necessary to discard any
- associated user data. */
+void _initialize_xml_support (void);
void
-make_cleanup_free_xml_parser (XML_Parser parser)
+_initialize_xml_support (void)
{
- make_cleanup (free_xml_parser, parser);
+ add_setshow_boolean_cmd ("xml", class_maintenance, &debug_xml,
+ _("Set XML parser debugging."),
+ _("Show XML parser debugging."),
+ _("When set, debugging messages for XML parsers "
+ "are displayed."),
+ NULL, show_debug_xml,
+ &setdebuglist, &showdebuglist);
}
-
-#endif /* HAVE_LIBEXPAT */
projects / platform / upstream / binutils.git / blobdiff