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gmarkup.c
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gmarkup.c
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/* gmarkup.c - Simple XML-like parser
*
* Copyright 2000 Red Hat, Inc.
*
* GLib is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* GLib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GLib; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "glib.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "glibintl.h"
GQuark
g_markup_error_quark ()
{
static GQuark error_quark = 0;
if (error_quark == 0)
error_quark = g_quark_from_static_string ("g-markup-error-quark");
return error_quark;
}
typedef enum
{
STATE_START,
STATE_AFTER_OPEN_ANGLE,
STATE_AFTER_CLOSE_ANGLE,
STATE_AFTER_ELISION_SLASH, /* the slash that obviates need for end element */
STATE_INSIDE_OPEN_TAG_NAME,
STATE_INSIDE_ATTRIBUTE_NAME,
STATE_BETWEEN_ATTRIBUTES,
STATE_AFTER_ATTRIBUTE_EQUALS_SIGN,
STATE_INSIDE_ATTRIBUTE_VALUE,
STATE_INSIDE_TEXT,
STATE_AFTER_CLOSE_TAG_SLASH,
STATE_INSIDE_CLOSE_TAG_NAME,
STATE_INSIDE_PASSTHROUGH,
STATE_ERROR
} GMarkupParseState;
struct _GMarkupParseContext
{
const GMarkupParser *parser;
GMarkupParseFlags flags;
gint line_number;
gint char_number;
gpointer user_data;
GDestroyNotify dnotify;
/* A piece of character data or an element that
* hasn't "ended" yet so we haven't yet called
* the callback for it.
*/
GString *partial_chunk;
GMarkupParseState state;
GSList *tag_stack;
gchar **attr_names;
gchar **attr_values;
gint cur_attr;
gint alloc_attrs;
const gchar *current_text;
gint current_text_len;
const gchar *current_text_end;
GString *leftover_char_portion;
/* used to save the start of the last interesting thingy */
const gchar *start;
const gchar *iter;
guint document_empty : 1;
guint parsing : 1;
};
/**
* g_markup_parse_context_new:
* @parser: a #GMarkupParser
* @flags: one or more #GMarkupParseFlags
* @user_data: user data to pass to #GMarkupParser functions
* @user_data_dnotify: user data destroy notifier called when the parse context is freed
*
* Creates a new parse context. A parse context is used to parse
* marked-up documents. You can feed any number of documents into
* a context, as long as no errors occur; once an error occurs,
* the parse context can't continue to parse text (you have to free it
* and create a new parse context).
*
* Return value: a new #GMarkupParseContext
**/
GMarkupParseContext *
g_markup_parse_context_new (const GMarkupParser *parser,
GMarkupParseFlags flags,
gpointer user_data,
GDestroyNotify user_data_dnotify)
{
GMarkupParseContext *context;
g_return_val_if_fail (parser != NULL, NULL);
context = g_new (GMarkupParseContext, 1);
context->parser = parser;
context->flags = flags;
context->user_data = user_data;
context->dnotify = user_data_dnotify;
context->line_number = 1;
context->char_number = 1;
context->partial_chunk = NULL;
context->state = STATE_START;
context->tag_stack = NULL;
context->attr_names = NULL;
context->attr_values = NULL;
context->cur_attr = -1;
context->alloc_attrs = 0;
context->current_text = NULL;
context->current_text_len = -1;
context->current_text_end = NULL;
context->leftover_char_portion = NULL;
context->start = NULL;
context->iter = NULL;
context->document_empty = TRUE;
context->parsing = FALSE;
return context;
}
/**
* g_markup_parse_context_free:
* @context: a #GMarkupParseContext
*
* Frees a #GMarkupParseContext. Can't be called from inside
* one of the #GMarkupParser functions.
*
**/
void
g_markup_parse_context_free (GMarkupParseContext *context)
{
g_return_if_fail (context != NULL);
g_return_if_fail (!context->parsing);
if (context->dnotify)
(* context->dnotify) (context->user_data);
g_strfreev (context->attr_names);
g_strfreev (context->attr_values);
g_slist_foreach (context->tag_stack, (GFunc)g_free, NULL);
g_slist_free (context->tag_stack);
if (context->partial_chunk)
g_string_free (context->partial_chunk, TRUE);
if (context->leftover_char_portion)
g_string_free (context->leftover_char_portion, TRUE);
g_free (context);
}
static void
mark_error (GMarkupParseContext *context,
GError *error)
{
context->state = STATE_ERROR;
if (context->parser->error)
(*context->parser->error) (context, error, context->user_data);
}
static void
set_error (GMarkupParseContext *context,
GError **error,
GMarkupError code,
const gchar *format,
...)
{
GError *tmp_error;
gchar *s;
va_list args;
va_start (args, format);
s = g_strdup_vprintf (format, args);
va_end (args);
tmp_error = g_error_new (G_MARKUP_ERROR,
code,
_("Error on line %d char %d: %s"),
context->line_number,
context->char_number,
s);
g_free (s);
mark_error (context, tmp_error);
g_propagate_error (error, tmp_error);
}
static gboolean
is_name_start_char (gunichar c)
{
if (g_unichar_isalpha (c) ||
c == '_' ||
c == ':')
return TRUE;
else
return FALSE;
}
static gboolean
is_name_char (gunichar c)
{
if (g_unichar_isalnum (c) ||
c == '.' ||
c == '-' ||
c == '_' ||
c == ':')
return TRUE;
else
return FALSE;
}
static gchar*
char_str (gunichar c,
gchar *buf)
{
memset (buf, 0, 7);
g_unichar_to_utf8 (c, buf);
return buf;
}
static gchar*
utf8_str (const gchar *utf8,
gchar *buf)
{
char_str (g_utf8_get_char (utf8), buf);
return buf;
}
static void
set_unescape_error (GMarkupParseContext *context,
GError **error,
const gchar *remaining_text,
const gchar *remaining_text_end,
GMarkupError code,
const gchar *format,
...)
{
GError *tmp_error;
gchar *s;
va_list args;
gint remaining_newlines;
const gchar *p;
remaining_newlines = 0;
p = remaining_text;
while (p != remaining_text_end)
{
if (*p == '\n')
++remaining_newlines;
++p;
}
va_start (args, format);
s = g_strdup_vprintf (format, args);
va_end (args);
tmp_error = g_error_new (G_MARKUP_ERROR,
code,
_("Error on line %d: %s"),
context->line_number - remaining_newlines,
s);
g_free (s);
mark_error (context, tmp_error);
g_propagate_error (error, tmp_error);
}
typedef enum
{
USTATE_INSIDE_TEXT,
USTATE_AFTER_AMPERSAND,
USTATE_INSIDE_ENTITY_NAME,
USTATE_AFTER_CHARREF_HASH
} UnescapeState;
static gboolean
unescape_text (GMarkupParseContext *context,
const gchar *text,
const gchar *text_end,
gchar **unescaped,
GError **error)
{
#define MAX_ENT_LEN 5
GString *str;
const gchar *p;
UnescapeState state;
const gchar *start;
str = g_string_new ("");
state = USTATE_INSIDE_TEXT;
p = text;
start = p;
while (p != text_end && context->state != STATE_ERROR)
{
g_assert (p < text_end);
switch (state)
{
case USTATE_INSIDE_TEXT:
{
while (p != text_end && *p != '&')
p = g_utf8_next_char (p);
if (p != start)
{
g_string_append_len (str, start, p - start);
start = NULL;
}
if (p != text_end && *p == '&')
{
p = g_utf8_next_char (p);
state = USTATE_AFTER_AMPERSAND;
}
}
break;
case USTATE_AFTER_AMPERSAND:
{
if (*p == '#')
{
p = g_utf8_next_char (p);
start = p;
state = USTATE_AFTER_CHARREF_HASH;
}
else if (!is_name_start_char (g_utf8_get_char (p)))
{
if (*p == ';')
{
set_unescape_error (context, error,
p, text_end,
G_MARKUP_ERROR_PARSE,
_("Empty entity '&;' seen; valid "
"entities are: & " < > '"));
}
else
{
gchar buf[7];
set_unescape_error (context, error,
p, text_end,
G_MARKUP_ERROR_PARSE,
_("Character '%s' is not valid at "
"the start of an entity name; "
"the & character begins an entity; "
"if this ampersand isn't supposed "
"to be an entity, escape it as "
"&"),
utf8_str (p, buf));
}
}
else
{
start = p;
state = USTATE_INSIDE_ENTITY_NAME;
}
}
break;
case USTATE_INSIDE_ENTITY_NAME:
{
gchar buf[MAX_ENT_LEN+1] = {
'\0', '\0', '\0', '\0', '\0', '\0'
};
gchar *dest;
while (p != text_end)
{
if (*p == ';')
break;
else if (!is_name_char (*p))
{
gchar ubuf[7];
set_unescape_error (context, error,
p, text_end,
G_MARKUP_ERROR_PARSE,
_("Character '%s' is not valid "
"inside an entity name"),
utf8_str (p, ubuf));
break;
}
p = g_utf8_next_char (p);
}
if (context->state != STATE_ERROR)
{
if (p != text_end)
{
const gchar *src;
src = start;
dest = buf;
while (src != p)
{
*dest = *src;
++dest;
++src;
}
/* move to after semicolon */
p = g_utf8_next_char (p);
start = p;
state = USTATE_INSIDE_TEXT;
if (strcmp (buf, "lt") == 0)
g_string_append_c (str, '<');
else if (strcmp (buf, "gt") == 0)
g_string_append_c (str, '>');
else if (strcmp (buf, "amp") == 0)
g_string_append_c (str, '&');
else if (strcmp (buf, "quot") == 0)
g_string_append_c (str, '"');
else if (strcmp (buf, "apos") == 0)
g_string_append_c (str, '\'');
else
{
set_unescape_error (context, error,
p, text_end,
G_MARKUP_ERROR_PARSE,
_("Entity name '%s' is not known"),
buf);
}
}
else
{
set_unescape_error (context, error,
/* give line number of the & */
start, text_end,
G_MARKUP_ERROR_PARSE,
_("Entity did not end with a semicolon; "
"most likely you used an ampersand "
"character without intending to start "
"an entity - escape ampersand as &"));
}
}
}
break;
case USTATE_AFTER_CHARREF_HASH:
{
gboolean is_hex = FALSE;
if (*p == 'x')
{
is_hex = TRUE;
p = g_utf8_next_char (p);
start = p;
}
while (p != text_end && *p != ';')
p = g_utf8_next_char (p);
if (p != text_end)
{
g_assert (*p == ';');
/* digit is between start and p */
if (start != p)
{
gchar *digit = g_strndup (start, p - start);
gulong l;
gchar *end = NULL;
gchar *digit_end = digit + (p - start);
errno = 0;
if (is_hex)
l = strtoul (digit, &end, 16);
else
l = strtoul (digit, &end, 10);
if (end != digit_end || errno != 0)
{
set_unescape_error (context, error,
start, text_end,
G_MARKUP_ERROR_PARSE,
_("Failed to parse '%s', which "
"should have been a digit "
"inside a character reference "
"(ê for example) - perhaps "
"the digit is too large"),
digit);
}
else
{
/* characters XML permits */
if (l == 0x9 ||
l == 0xA ||
l == 0xD ||
(l >= 0x20 && l <= 0xD7FF) ||
(l >= 0xE000 && l <= 0xFFFD) ||
(l >= 0x10000 && l <= 0x10FFFF))
{
gchar buf[7];
g_string_append (str,
char_str (l, buf));
}
else
{
set_unescape_error (context, error,
start, text_end,
G_MARKUP_ERROR_PARSE,
_("Character reference '%s' does not encode a permitted character"),
digit);
}
}
g_free (digit);
/* Move to next state */
p = g_utf8_next_char (p); /* past semicolon */
start = p;
state = USTATE_INSIDE_TEXT;
}
else
{
set_unescape_error (context, error,
start, text_end,
G_MARKUP_ERROR_PARSE,
_("Empty character reference; "
"should include a digit such as "
"dž"));
}
}
else
{
set_unescape_error (context, error,
start, text_end,
G_MARKUP_ERROR_PARSE,
_("Character reference did not end with a "
"semicolon; "
"most likely you used an ampersand "
"character without intending to start "
"an entity - escape ampersand as &"));
}
}
break;
default:
g_assert_not_reached ();
break;
}
}
/* If no errors, we should have returned to USTATE_INSIDE_TEXT */
g_assert (context->state == STATE_ERROR ||
state == USTATE_INSIDE_TEXT);
if (context->state == STATE_ERROR)
{
g_string_free (str, TRUE);
*unescaped = NULL;
return FALSE;
}
else
{
*unescaped = g_string_free (str, FALSE);
return TRUE;
}
#undef MAX_ENT_LEN
}
static gboolean
advance_char (GMarkupParseContext *context)
{
context->iter = g_utf8_next_char (context->iter);
context->char_number += 1;
if (*context->iter == '\n')
{
context->line_number += 1;
context->char_number = 1;
}
return context->iter != context->current_text_end;
}
static void
skip_spaces (GMarkupParseContext *context)
{
do
{
if (!g_unichar_isspace (g_utf8_get_char (context->iter)))
return;
}
while (advance_char (context));
}
static void
advance_to_name_end (GMarkupParseContext *context)
{
do
{
if (!is_name_char (g_utf8_get_char (context->iter)))
return;
}
while (advance_char (context));
}
static void
add_to_partial (GMarkupParseContext *context,
const gchar *text_start,
const gchar *text_end)
{
if (context->partial_chunk == NULL)
context->partial_chunk = g_string_new ("");
if (text_start != text_end)
g_string_append_len (context->partial_chunk, text_start,
text_end - text_start);
/* Invariant here that partial_chunk exists */
}
static void
truncate_partial (GMarkupParseContext *context)
{
if (context->partial_chunk != NULL)
{
context->partial_chunk = g_string_truncate (context->partial_chunk, 0);
}
}
static const gchar*
current_element (GMarkupParseContext *context)
{
return context->tag_stack->data;
}
static const gchar*
current_attribute (GMarkupParseContext *context)
{
g_assert (context->cur_attr >= 0);
return context->attr_names[context->cur_attr];
}
static void
find_current_text_end (GMarkupParseContext *context)
{
/* This function must be safe (non-segfaulting) on invalid UTF8 */
const gchar *end = context->current_text + context->current_text_len;
const gchar *p;
const gchar *next;
g_assert (context->current_text_len > 0);
p = context->current_text;
next = g_utf8_find_next_char (p, end);
while (next)
{
p = next;
next = g_utf8_find_next_char (p, end);
}
/* p is now the start of the last character or character portion. */
g_assert (p != end);
next = g_utf8_next_char (p); /* this only touches *p, nothing beyond */
if (next == end)
{
/* whole character */
context->current_text_end = end;
}
else
{
/* portion */
context->leftover_char_portion = g_string_new_len (p, end - p);
context->current_text_len -= (end - p);
context->current_text_end = p;
}
}
static void
add_attribute (GMarkupParseContext *context, char *name)
{
if (context->cur_attr + 2 >= context->alloc_attrs)
{
context->alloc_attrs += 5; /* silly magic number */
context->attr_names = g_realloc (context->attr_names, sizeof(char*)*context->alloc_attrs);
context->attr_values = g_realloc (context->attr_values, sizeof(char*)*context->alloc_attrs);
}
context->cur_attr++;
context->attr_names[context->cur_attr] = name;
context->attr_values[context->cur_attr] = NULL;
context->attr_names[context->cur_attr+1] = NULL;
}
/**
* g_markup_parse_context_parse:
* @context: a #GMarkupParseContext
* @text: chunk of text to parse
* @text_len: length of @text in bytes
* @error: return location for a #GError
*
* Feed some data to the #GMarkupParseContext. The data need not
* be valid UTF-8; an error will be signaled if it's invalid.
* The data need not be an entire document; you can feed a document
* into the parser incrementally, via multiple calls to this function.
* Typically, as you receive data from a network connection or file,
* you feed each received chunk of data into this function, aborting
* the process if an error occurs. Once an error is reported, no further
* data may be fed to the #GMarkupParseContext; all errors are fatal.
*
* Return value: %FALSE if an error occurred, %TRUE on success
**/
gboolean
g_markup_parse_context_parse (GMarkupParseContext *context,
const gchar *text,
gint text_len,
GError **error)
{
const gchar *first_invalid;
g_return_val_if_fail (context != NULL, FALSE);
g_return_val_if_fail (text != NULL, FALSE);
g_return_val_if_fail (context->state != STATE_ERROR, FALSE);
g_return_val_if_fail (!context->parsing, FALSE);
if (text_len < 0)
text_len = strlen (text);
if (text_len == 0)
return TRUE;
context->parsing = TRUE;
if (context->leftover_char_portion)
{
const gchar *first_char;
if ((*text & 0xc0) != 0x80)
first_char = text;
else
first_char = g_utf8_find_next_char (text, text + text_len);
if (first_char)
{
/* leftover_char_portion was completed. Parse it. */
GString *portion = context->leftover_char_portion;
g_string_append_len (context->leftover_char_portion,
text, first_char - text);
/* hacks to allow recursion */
context->parsing = FALSE;
context->leftover_char_portion = NULL;
if (!g_markup_parse_context_parse (context,
portion->str, portion->len,
error))
{
g_assert (context->state == STATE_ERROR);
}
g_string_free (portion, TRUE);
context->parsing = TRUE;
/* Skip the fraction of char that was in this text */
text_len -= (first_char - text);
text = first_char;
}
else
{
/* another little chunk of the leftover char; geez
* someone is inefficient.
*/
g_string_append_len (context->leftover_char_portion,
text, text_len);
if (context->leftover_char_portion->len > 7)
{
/* The leftover char portion is too big to be
* a UTF-8 character
*/
set_error (context,
error,
G_MARKUP_ERROR_BAD_UTF8,
_("Invalid UTF-8 encoded text"));
}
goto finished;
}
}
context->current_text = text;
context->current_text_len = text_len;
context->iter = context->current_text;
context->start = context->iter;
/* Nothing left after finishing the leftover char, or nothing
* passed in to begin with.
*/
if (context->current_text_len == 0)
goto finished;
/* find_current_text_end () assumes the string starts at
* a character start, so we need to validate at least
* that much. It doesn't assume any following bytes
* are valid.
*/
if ((*context->current_text & 0xc0) == 0x80) /* not a char start */
{
set_error (context,
error,
G_MARKUP_ERROR_BAD_UTF8,
_("Invalid UTF-8 encoded text"));
goto finished;
}
/* Initialize context->current_text_end, possibly adjusting
* current_text_len, and add any leftover char portion
*/
find_current_text_end (context);
/* Validate UTF8 (must be done after we find the end, since
* we could have a trailing incomplete char)
*/
if (!g_utf8_validate (context->current_text,
context->current_text_len,
&first_invalid))
{
gint newlines = 0;
const gchar *p;
p = context->current_text;
while (p != context->current_text_end)
{
if (*p == '\n')
++newlines;
++p;
}
context->line_number += newlines;
set_error (context,
error,
G_MARKUP_ERROR_BAD_UTF8,
_("Invalid UTF-8 encoded text"));
goto finished;
}
while (context->iter != context->current_text_end)
{
switch (context->state)
{
case STATE_START:
/* Possible next state: AFTER_OPEN_ANGLE */
g_assert (context->tag_stack == NULL);
/* whitespace is ignored outside of any elements */
skip_spaces (context);
if (context->iter != context->current_text_end)
{
if (*context->iter == '<')
{
/* Move after the open angle */
advance_char (context);
context->state = STATE_AFTER_OPEN_ANGLE;
/* this could start a passthrough */
context->start = context->iter;
/* document is now non-empty */
context->document_empty = FALSE;
}
else
{
set_error (context,
error,
G_MARKUP_ERROR_PARSE,
_("Document must begin with an element (e.g. <book>)"));
}
}
break;
case STATE_AFTER_OPEN_ANGLE:
/* Possible next states: INSIDE_OPEN_TAG_NAME,
* AFTER_CLOSE_TAG_SLASH, INSIDE_PASSTHROUGH
*/
if (*context->iter == '?' ||
*context->iter == '!')
{
/* include < in the passthrough */
const gchar *openangle = "<";
add_to_partial (context, openangle, openangle + 1);
context->start = context->iter;
context->state = STATE_INSIDE_PASSTHROUGH;
}
else if (*context->iter == '/')
{
/* move after it */
advance_char (context);
context->state = STATE_AFTER_CLOSE_TAG_SLASH;
}
else if (is_name_start_char (g_utf8_get_char (context->iter)))
{
context->state = STATE_INSIDE_OPEN_TAG_NAME;
/* start of tag name */
context->start = context->iter;
}
else
{
gchar buf[7];
set_error (context,
error,
G_MARKUP_ERROR_PARSE,
_("'%s' is not a valid character following "
"a '<' character; it may not begin an "
"element name"),
utf8_str (context->iter, buf));
}
break;
/* The AFTER_CLOSE_ANGLE state is actually sort of
* broken, because it doesn't correspond to a range
* of characters in the input stream as the others do,
* and thus makes things harder to conceptualize
*/
case STATE_AFTER_CLOSE_ANGLE:
/* Possible next states: INSIDE_TEXT, STATE_START */
if (context->tag_stack == NULL)
{
context->start = NULL;
context->state = STATE_START;
}
else
{
context->start = context->iter;
context->state = STATE_INSIDE_TEXT;
}
break;
case STATE_AFTER_ELISION_SLASH:
/* Possible next state: AFTER_CLOSE_ANGLE */
{
/* We need to pop the tag stack and call the end_element
* function, since this is the close tag
*/
GError *tmp_error = NULL;
g_assert (context->tag_stack != NULL);
tmp_error = NULL;
if (context->parser->end_element)
(* context->parser->end_element) (context,