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form a semantic representation of the pipeline in preparation for actual instantiation.
Original commit message from CVS: * form a semantic representation of the pipeline in preparation for actual instantiation. the parser is shaping up quite nicely; it should, in theory, be able to create all types of pipelines that gstreamer supports
This commit is contained in:
Andy Wingo
parent
f6112a24bb
commit
66107d8717
4 changed files with 123 additions and 24 deletions
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@ -2,12 +2,13 @@
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#libgstparse_la_SOURCES = parse.c grammar.c
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BISON = bison -d
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BISON = bison -d -v
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noinst_PROGRAMS = grammar
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grammar_SOURCES = lex.yy.c grammar.tab.c
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grammar_CFLAGS = $(GLIB_CFLAGS)
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grammar_LDADD = $(GLIB_LIBS)
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noinst_HEADERS = grammar.tab.h
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@ -1,6 +1,7 @@
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%{
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#include <glib.h>
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#include <stdio.h>
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#include "types.h"
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#define YYDEBUG 1
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#define YYERROR_VERBOSE 1
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%}
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@ -10,6 +11,11 @@
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gboolean b;
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gint i;
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gchar *s;
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graph_t *g;
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connection_t *c;
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property_t *p;
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element_t *e;
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hash_t *h;
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}
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%token <s> IDENTIFIER STRING
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@ -17,6 +23,13 @@
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%token <i> INTEGER
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%token <b> BOOLEAN
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%type <s> id
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%type <h> qid
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%type <g> graph bin
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%type <e> element
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%type <p> property_value value
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%type <c> connection lconnection rconnection qconnection iconnection
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%left '{' '}' '(' ')'
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%left '!' '='
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%left '+'
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@ -25,49 +38,92 @@
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%start graph
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%%
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id: IDENTIFIER {}
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id: IDENTIFIER
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;
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qid: id
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| id '.' id
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qid: id { $$ = g_new0 (hash_t, 1); $$->id2 = $1 }
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| id '.' id { $$ = g_new0 (hash_t, 1); $$->id1 = $1; $$->id2 = $3; }
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;
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value: STRING {}
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| FLOAT {}
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| INTEGER {}
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| BOOLEAN {}
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value: STRING { $$ = g_new0 (property_t, 1);
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$$->value_type = G_TYPE_STRING; $$->value.s = $1; }
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| FLOAT { $$ = g_new0 (property_t, 1);
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$$->value_type = G_TYPE_DOUBLE; $$->value.d = $1; }
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| INTEGER { $$ = g_new0 (property_t, 1);
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$$->value_type = G_TYPE_INT; $$->value.i = $1; }
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| BOOLEAN { $$ = g_new0 (property_t, 1);
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$$->value_type = G_TYPE_BOOLEAN; $$->value.b = $1; }
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;
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property_value: qid '=' value
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property_value: id '=' value { $$ = $3; $$->name = $1; }
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;
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element: id
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| bin
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element: id { $$ = g_new0 (element_t, 1); $$->name = $1; }
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;
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graph: /* empty */
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| graph element
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| graph connection
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| graph property_value
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graph: /* empty */ { $$ = g_new0 (graph_t, 1); }
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| graph element { GList *l = $$->connections_pending;
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$$ = $1;
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$$->elements = g_list_append ($$->elements, $2);
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$$->current = $2;
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while (l) {
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((connection_t*) l->data)->sink = $$->current->name;
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l = g_list_next (l);
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}
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if ($$->connections_pending) {
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g_list_free ($$->connections_pending);
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$$->connections_pending = NULL;
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}
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}
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| graph bin { $$ = $1; $$->bins = g_list_append ($$->bins, $2); }
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| graph connection { $$ = $1; $$->connections = g_list_append ($$->connections, $2);
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if (!$2->src)
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$2->src = $$->current->name;
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if (!$2->sink)
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$$->connections_pending = g_list_append ($$->connections_pending, $2);
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}
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| graph property_value { $$ = $1;
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$$->current->property_values = g_list_append ($$->current->property_values,
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$2);
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}
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;
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bin: '{' graph '}'
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| id '.' '(' graph ')'
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bin: '{' graph '}' { $$ = $2; $$->current_bin_type = "gstthread"; }
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| id '.' '(' graph ')' { $$ = $4; $$->current_bin_type = $1; }
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;
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connection: lconnection
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| rconnection
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| bconnection
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| qconnection
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| iconnection
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;
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lconnection: qid '+' '!'
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lconnection: qid '+' '!' { $$ = g_new0 (connection_t, 1);
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$$->src = $1->id1;
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$$->src_pads = g_list_append ($$->src_pads, $1->id2);
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}
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;
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rconnection: '!' '+' qid
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rconnection: '!' '+' qid { $$ = g_new0 (connection_t, 1);
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$$->sink = $3->id1;
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$$->sink_pads = g_list_append ($$->src_pads, $3->id2);
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}
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;
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bconnection: '!'
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| qid '+' bconnection '+' qid
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qconnection: qid '+' '!' '+' qid { $$ = g_new0 (connection_t, 1);
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$$->src = $1->id1;
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$$->src_pads = g_list_append ($$->src_pads, $1->id2);
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$$->sink = $5->id1;
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$$->sink_pads = g_list_append ($$->sink_pads, $5->id2);
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}
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;
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iconnection: '!' { $$ = g_new0 (connection_t, 1); }
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| id '+' iconnection '+' id
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{ $$ = $3;
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$$->src_pads = g_list_append ($$->src_pads, $1);
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$$->sink_pads = g_list_append ($$->sink_pads, $5);
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}
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;
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%%
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@ -89,5 +145,9 @@ int main (int argc, char **argv)
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else
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yyin = stdin;
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#ifdef DEBUG
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yydebug = 1;
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#endif
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return yyparse();
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}
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@ -2,7 +2,7 @@
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#include <math.h>
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#include <ctype.h>
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#include <string.h>
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#include <glib.h>
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#include "types.h"
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#include <grammar.tab.h>
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#ifdef DEBUG
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38
gst/parse/types.h
Normal file
38
gst/parse/types.h
Normal file
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@ -0,0 +1,38 @@
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#include <glib-object.h>
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typedef struct {
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gchar *name;
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GList *property_values;
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} element_t;
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typedef struct {
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gchar *name;
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GType value_type;
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union {
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gdouble d;
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gboolean b;
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gint i;
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gchar *s;
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} value;
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} property_t;
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typedef struct {
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char *src;
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char *sink;
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GList *src_pads;
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GList *sink_pads;
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} connection_t;
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typedef struct {
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element_t *current;
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gchar *current_bin_type;
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GList *elements;
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GList *connections;
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GList *connections_pending;
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GList *bins;
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} graph_t;
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typedef struct {
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gchar *id1;
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gchar *id2;
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} hash_t;
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