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/* tmpl-lexer.c
*
* Copyright (C) 2016 Christian Hergert <chergert@redhat.com>
*
* This file 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 2.1 of the License, or (at your option) any later version.
*
* This file 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 General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define G_LOG_DOMAIN "tmpl-lexer"
#include "tmpl-error.h"
#include "tmpl-debug.h"
#include "tmpl-lexer.h"
#include "tmpl-template-locator.h"
#include "tmpl-token-input-stream.h"
struct _TmplLexer
{
GQueue *stream_stack;
TmplTemplateLocator *locator;
GHashTable *circular;
GSList *unget;
};
G_DEFINE_POINTER_TYPE (TmplLexer, tmpl_lexer)
TmplLexer *
tmpl_lexer_new (GInputStream *stream,
TmplTemplateLocator *locator)
{
TmplLexer *self;
g_return_val_if_fail (G_IS_INPUT_STREAM (stream), NULL);
g_return_val_if_fail (!locator || TMPL_IS_TEMPLATE_LOCATOR (locator), NULL);
self = g_slice_new0 (TmplLexer);
self->stream_stack = g_queue_new ();
self->locator = locator ? g_object_ref (locator) : tmpl_template_locator_new ();
self->circular = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
g_queue_push_head (self->stream_stack, tmpl_token_input_stream_new (stream));
return self;
}
void
tmpl_lexer_free (TmplLexer *self)
{
if (self != NULL)
{
const GList *iter;
for (iter = self->stream_stack->head; iter != NULL; iter = iter->next)
{
TmplTokenInputStream *stream = iter->data;
g_object_unref (stream);
}
g_clear_pointer (&self->circular, g_hash_table_unref);
g_clear_pointer (&self->stream_stack, g_queue_free);
g_clear_object (&self->locator);
g_slice_free (TmplLexer, self);
}
}
/**
* tmpl_lexer_next:
* @self: A #TmplLexer.
* @token: (out) (transfer full): A location for a #TmplToken.
* @cancellable: (nullable): A #GCancellable or %NULL.
* @error: A location for a #GError or %NULL.
*
* Reads the next token.
*
* It is possible for %FALSE to be returned and @error left unset.
* This happens at the end of the stream.
*
* Returns: %TRUE if @token was set, otherwise %FALSE.
*/
gboolean
tmpl_lexer_next (TmplLexer *self,
TmplToken **token,
GCancellable *cancellable,
GError **error)
{
TmplTokenInputStream *stream;
GError *local_error = NULL;
gboolean ret = FALSE;
TMPL_ENTRY;
g_return_val_if_fail (self != NULL, FALSE);
g_return_val_if_fail (token != NULL, FALSE);
g_return_val_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable), FALSE);
*token = NULL;
if (self->unget != NULL)
{
*token = self->unget->data;
self->unget = g_slist_remove_link (self->unget, self->unget);
TMPL_RETURN (TRUE);
}
while ((stream = g_queue_peek_head (self->stream_stack)))
{
if (!(*token = tmpl_token_input_stream_read_token (stream, cancellable, &local_error)))
{
/*
* If we finished this stream, try to move to the next one.
*/
if (local_error == NULL)
{
const gchar *path = g_object_get_data (G_OBJECT (stream), "PATH");
if (path != NULL && self->circular != NULL)
g_hash_table_remove (self->circular, path);
g_queue_pop_head (self->stream_stack);
g_object_unref (stream);
continue;
}
TMPL_GOTO (finish);
}
/*
* If the current token is an include token, we need to resolve the
* include path and read tokens from it.
*/
if (tmpl_token_type (*token) == TMPL_TOKEN_INCLUDE)
{
const gchar *path = tmpl_token_include_get_path (*token);
GInputStream *input;
g_assert (self->circular != NULL);
if (path == NULL)
{
local_error = g_error_new (TMPL_ERROR,
TMPL_ERROR_NOT_A_VALUE,
"Expected template path, got null");
g_clear_pointer (token, tmpl_token_free);
TMPL_GOTO (finish);
}
if (g_hash_table_contains (self->circular, path))
{
local_error = g_error_new (TMPL_ERROR,
TMPL_ERROR_CIRCULAR_INCLUDE,
"A circular include was detected: \"%s\"",
path);
g_clear_pointer (token, tmpl_token_free);
TMPL_GOTO (finish);
}
if (!(input = tmpl_template_locator_locate (self->locator, path, &local_error)))
{
g_clear_pointer (token, tmpl_token_free);
TMPL_GOTO (finish);
}
g_hash_table_insert (self->circular, g_strdup (path), NULL);
stream = tmpl_token_input_stream_new (input);
g_object_set_data_full (G_OBJECT (stream), "PATH", g_strdup (path), g_free);
g_queue_push_head (self->stream_stack, stream);
g_clear_pointer (token, tmpl_token_free);
g_object_unref (input);
continue;
}
ret = TRUE;
break;
}
if (*token == NULL)
{
*token = tmpl_token_new_eof ();
ret = TRUE;
}
finish:
if ((ret == FALSE) && (local_error != NULL))
g_propagate_error (error, local_error);
g_assert (ret == FALSE || *token != NULL);
TMPL_RETURN (ret);
}
void
tmpl_lexer_unget (TmplLexer *self,
TmplToken *token)
{
g_return_if_fail (self != NULL);
g_return_if_fail (token != NULL);
self->unget = g_slist_prepend (self->unget, token);
}
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