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docs: Add simple GMarkup parser example

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Based on an initial parser by Luc Pionchon.

https://bugzilla.gnome.org/show_bug.cgi?id=442929
This commit is contained in:
David King
2012-11-23 18:47:03 +00:00
parent ee2bd279cf
commit ae88f40549
4 changed files with 156 additions and 0 deletions
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2
glib/gmarkup.c
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@@ -81,6 +81,8 @@
* <listitem>Character references</listitem>
* <listitem>Sections marked as CDATA</listitem>
* </itemizedlist>
*
* <example id="gmarkup-example"><title>Example GMarkup parser</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../glib/tests/markup-example.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
*/
G_DEFINE_QUARK (g-markup-error-quark, g_markup_error)

1
glib/tests/.gitignore vendored
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@@ -36,6 +36,7 @@ mainloop
mappedfile
markup-collect
markup-escape
markup-example
markup-parse
markup-subparser
mem-overflow

3
glib/tests/Makefile.am
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@@ -62,6 +62,9 @@ markup_collect_LDADD = $(progs_ldadd)
TEST_PROGS += markup-escape
markup_escape_LDADD = $(progs_ldadd)
TEST_PROGS += markup-example
markup_example_LDADD = $(progs_ldadd)
TEST_PROGS += markup-subparser
markup_subparser_LDADD = $(progs_ldadd)

150
glib/tests/markup-example.c Normal file
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@@ -0,0 +1,150 @@
#include <glib.h>
/*
* Example XML for the parser.
*/
static const gchar foo_xml_example[] =
"<foo bar='baz' bir='boz'>"
" <bar>bar text 1</bar> "
" <bar>bar text 2</bar> "
" foo text "
"<!-- nothing --> "
"</foo> ";
static void foo_parser_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error);
static void foo_parser_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error);
static void foo_parser_characters (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error);
static void foo_parser_passthrough (GMarkupParseContext *context,
const gchar *passthrough_text,
gsize text_len,
gpointer user_data,
GError **error);
static void foo_parser_error (GMarkupParseContext *context,
GError *error,
gpointer user_data);
/*
* Parser
*/
static const GMarkupParser foo_xml_parser = {
foo_parser_start_element,
foo_parser_end_element,
foo_parser_characters,
foo_parser_passthrough,
foo_parser_error
};
/*
* Called for opening tags like <foo bar="baz">
*/
static void
foo_parser_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
gsize i;
g_print ("element: <%s>\n", element_name);
for (i = 0; attribute_names[i]; i++)
{
g_print ("attribute: %s = \"%s\"\n", attribute_names[i],
attribute_values[i]);
}
}
/*
* Called for closing tags like </foo>
*/
static void
foo_parser_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
g_print ("attribute: </%s>\n", element_name);
}
/*
* Called for character data. Text is not nul-terminated
*/
static void
foo_parser_characters (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
g_print ("text: [%s]\n", text);
}
/*
* Called for strings that should be re-saved verbatim in this same
* position, but are not otherwise interpretable. At the moment this
* includes comments and processing instructions. Text is not
* nul-terminated.
*/
static void
foo_parser_passthrough (GMarkupParseContext *context,
const gchar *passthrough_text,
gsize text_len,
gpointer user_data,
GError **error)
{
g_print ("passthrough: %s\n", passthrough_text);
}
/*
* Called when any parsing method encounters an error. The GError should not be
* freed.
*/
static void
foo_parser_error (GMarkupParseContext *context,
GError *error,
gpointer user_data)
{
g_printerr ("ERROR: %s\n", error->message);
}
int main ()
{
GMarkupParseContext *context;
gboolean success = FALSE;
glong len;
len = g_utf8_strlen (foo_xml_example, -1);
g_print ("Parsing: %s\n", foo_xml_example);
g_print ("(%ld UTF8 characters)\n", len);
context = g_markup_parse_context_new (&foo_xml_parser, 0, NULL, NULL);
success = g_markup_parse_context_parse (context, foo_xml_example, len, NULL);
g_markup_parse_context_free (context);
if (success)
{
g_print ("DONE\n");
return 0;
}
else
{
g_printerr ("ERROR\n");
return 1;
}
}