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gst/parse/: push & pop the state of the lexer for reentrant use case

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Original commit message from CVS:
Patch by: Marc-Andre Lureau <marcandre.lureau@gmail.com>
* gst/parse/Makefile.am:
* gst/parse/grammar.y:
* gst/parse/parse.l:
push & pop the state of the lexer for reentrant use case
Fixes #349180
This commit is contained in:
Marc-Andre Lureau 2006-07-30 18:32:49 +00:00 committed by Stefan Kost
parent 8b97e07338
commit 48afa6dc3a
4 changed files with 45 additions and 30 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2006-07-30 Stefan Kost <ensonic@users.sf.net>
Patch by: Marc-Andre Lureau <marcandre.lureau@gmail.com>
* gst/parse/Makefile.am:
* gst/parse/grammar.y:
* gst/parse/parse.l:
push & pop the state of the lexer for reentrant use case
Fixes #349180
2006-07-29 Tim-Philipp Müller <tim at centricular dot net>
* libs/gst/base/gstbasesrc.h:

2
gst/parse/Makefile.am
View file

@ -18,7 +18,7 @@ libgstparse_la_LIBADD = $(GST_ALL_LIBS)
noinst_HEADERS = grammar.tab.h
grammar.tab.c grammar.tab.h: grammar.y
$(BISON_PATH) -d -v -p_gst_parse__yy $(srcdir)/grammar.y -o grammar.tab.c && \
$(BISON_PATH) -d -v -p_gst_parse_yy $(srcdir)/grammar.y -o grammar.tab.c && \
mv grammar.tab.c grammar.tab_tmp.c && \
echo '#ifdef HAVE_CONFIG_H' > grammar.tab_tmp2.c && \
echo '#include <config.h>' >> grammar.tab_tmp2.c && \

42
gst/parse/grammar.y
View file

@ -24,7 +24,17 @@
*/
#define YYERROR_VERBOSE 1
#define YYPARSE_PARAM graph
#define YYLEX_PARAM scanner
typedef void* yyscan_t;
int _gst_parse_yylex (void * yylval_param , yyscan_t yyscanner);
int _gst_parse_yylex_init (yyscan_t scanner);
int _gst_parse_yylex_destroy (yyscan_t scanner);
struct yy_buffer_state * _gst_parse_yy_scan_string (char* , yyscan_t);
void _gst_parse_yypush_buffer_state (void * new_buffer ,yyscan_t yyscanner );
void _gst_parse_yypop_buffer_state (yyscan_t yyscanner );
#ifdef __GST_PARSE_TRACE
static guint __strings;
@ -533,8 +543,7 @@ error:
}
static int yylex (void *lvalp);
static int yyerror (const char *s);
static int yyerror (graph_t *graph, const char *s);
%}
%union {
@ -565,7 +574,8 @@ static int yyerror (const char *s);
%right '.'
%left '!' '='
%pure_parser
%parse-param { void *scanner, graph_t *graph }
%pure-parser
%start graph
%%
@ -790,23 +800,16 @@ graph: /* NOP */ { SET_ERROR (((graph_t *) graph)->error, GST_PARSE_ERRO
%%
extern FILE *_gst_parse_yyin;
int _gst_parse_yylex (YYSTYPE *lvalp);
static int yylex (void *lvalp) {
return _gst_parse_yylex ((YYSTYPE*) lvalp);
}
static int
yyerror (const char *s)
yyerror (graph_t *graph, const char *s)
{
/* FIXME: This should go into the GError somehow, but how? */
GST_WARNING ("Error during parsing: %s", s);
return -1;
}
struct yy_buffer_state * _gst_parse_yy_scan_string (char*);
void _gst_parse_yy_delete_buffer (struct yy_buffer_state *);
GstElement *
_gst_parse_launch (const gchar *str, GError **error)
{
@ -815,8 +818,8 @@ _gst_parse_launch (const gchar *str, GError **error)
GSList *walk;
GstBin *bin = NULL;
GstElement *ret;
struct yy_buffer_state *buf;
yyscan_t scanner;
g_return_val_if_fail (str != NULL, NULL);
g.chain = NULL;
@ -829,21 +832,22 @@ _gst_parse_launch (const gchar *str, GError **error)
#endif /* __GST_PARSE_TRACE */
dstr = g_strdup (str);
buf = _gst_parse_yy_scan_string (dstr);
_gst_parse_yylex_init( &scanner );
_gst_parse_yy_scan_string (dstr, scanner);
#ifndef YYDEBUG
yydebug = 1;
#endif
if (yyparse (&g) != 0) {
if (yyparse (scanner, &g) != 0) {
SET_ERROR (error, GST_PARSE_ERROR_SYNTAX,
"Unrecoverable syntax error while parsing pipeline %s", str);
goto error1;
}
_gst_parse_yylex_destroy( scanner );
g_free (dstr);
_gst_parse_yy_delete_buffer (buf);
GST_CAT_DEBUG (GST_CAT_PIPELINE, "got %u elements and %u links",
g.chain ? g_slist_length (g.chain->elements) : 0,
g_slist_length (g.links));

21
gst/parse/parse.l
View file

@ -32,7 +32,6 @@ PRINT (const char *format, ...)
}
#endif
#define YY_DECL int _gst_parse_yylex (YYSTYPE *lvalp)
%}
_operator [(){}.!,;=]
@ -65,12 +64,14 @@ _link ("!"[[:space:]]*{_caps}([[:space:]]*(";"[[:space:]]*{_caps})*[[:space:]]*)
%x value
%option noyywrap
%option nounput
%option reentrant
%option bison-bridge
%%
{_assignment} {
/* "=" */
PRINT ("ASSIGNMENT: %s", yytext);
lvalp->s = gst_parse_strdup (yytext);
yylval->s = gst_parse_strdup (yytext);
BEGIN (INITIAL);
return ASSIGNMENT;
}
@ -78,14 +79,14 @@ _link ("!"[[:space:]]*{_caps}([[:space:]]*(";"[[:space:]]*{_caps})*[[:space:]]*)
{_padref} {
yytext++;
PRINT ("PADREF: %s", yytext);
lvalp->s = gst_parse_strdup (yytext);
yylval->s = gst_parse_strdup (yytext);
BEGIN (INITIAL);
return PADREF;
}
{_ref} {
PRINT ("REF: %s", yytext);
lvalp->s = gst_parse_strdup (yytext);
yylval->s = gst_parse_strdup (yytext);
BEGIN (INITIAL);
return REF;
}
@ -95,14 +96,14 @@ _link ("!"[[:space:]]*{_caps}([[:space:]]*(";"[[:space:]]*{_caps})*[[:space:]]*)
while (!g_ascii_isspace (*pos) && (*pos != '.')) pos++;
*pos = '\0';
PRINT ("BINREF: %s", yytext);
lvalp->s = gst_parse_strdup (yytext);
yylval->s = gst_parse_strdup (yytext);
BEGIN (INITIAL);
return BINREF;
}
{_identifier} {
PRINT ("IDENTIFIER: %s", yytext);
lvalp->s = gst_parse_strdup (yytext);
yylval->s = gst_parse_strdup (yytext);
BEGIN (INITIAL);
return IDENTIFIER;
}
@ -113,22 +114,22 @@ _link ("!"[[:space:]]*{_caps}([[:space:]]*(";"[[:space:]]*{_caps})*[[:space:]]*)
c++;
if (*c) {
while (g_ascii_isspace (*c)) c++;
c = lvalp->s = gst_parse_strdup (c);
c = yylval->s = gst_parse_strdup (c);
while (*c) c++;
if (*--c != '!')
g_assert_not_reached ();
while (g_ascii_isspace (*--c));
*++c = '\0';
} else {
lvalp->s = NULL;
yylval->s = NULL;
}
BEGIN (INITIAL);
return LINK;
}
{_url} {
PRINT ("URL: %s", yytext);
lvalp->s = g_strdup (yytext);
gst_parse_unescape (lvalp->s);
yylval->s = g_strdup (yytext);
gst_parse_unescape (yylval->s);
BEGIN (INITIAL);
return PARSE_URL;
}