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/* $Id: dotparse.y,v 1.3 2005/04/08 20:45:34 erg Exp $ $Revision: 1.3 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
%{
#if _PACKAGE_ast
#include <ast.h>
#endif
#include <stdio.h>
typedef void *Tobj;
#include "config.h"
#include "dot2l.h"
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#include <string.h>
static char portstr[SMALLBUF];
extern void yyerror(const char *fmt, ...);
%}
%union {
long i;
char *s;
void *o;
}
%token <i> T_graph T_digraph T_strict
%token <i> T_node T_edge T_edgeop
%token <s> T_id
%type <o> node_name node_id subg_stmt
%left <i> T_subgraph /* to eliminate subgraph hdr shift/reduce conflict */
%left '{'
%%
file: graph_type T_id
{ D2Lbegin ($2); free ($2); }
'{' stmt_list '}'
{ D2Lend (); }
| error
{ D2Labort (); }
| /* empty*/
{ D2Labort (); }
;
graph_type: T_graph /* safe to change graph type/name before contents appear */
{ gtype = "graph"; etype = "--"; }
| T_strict T_graph
{ gtype = "strict graph"; etype = "--"; }
| T_digraph
{ gtype = "digraph"; etype = "->"; }
| T_strict T_digraph
{ gtype = "strict digraph"; etype = "->"; }
;
stmt_list: stmt_list1
| /* empty */
;
stmt_list1: stmt
| stmt_list1 stmt
;
stmt: stmt1
| stmt1 ';'
;
stmt1: node_stmt /* create nodes and set attributes */
| edge_stmt /* create edges and set attributes */
| attr_stmt /* reset value of attributes */
| subg_stmt {}
;
node_stmt: node_id { attrclass = NODE; portstr[0] = '\000'; }
opt_attr_list { attrclass = GRAPH; }
;
node_id: node_name node_port
{ $$ = $1; }
;
node_name: T_id
{ $$ = D2Linsertnode ($1); free ($1); }
;
edge_stmt: node_id
{ D2Lbeginedge (NODE, $1, portstr); portstr[0] = '\000'; }
edgeRHS
{ attrclass = EDGE; }
opt_attr_list
{ D2Lendedge (); attrclass = GRAPH; }
| subg_stmt
{ D2Lbeginedge (GRAPH, $1, ""); }
edgeRHS
{ attrclass = EDGE; }
opt_attr_list
{ D2Lendedge (); attrclass = GRAPH; }
;
edgeRHS: T_edgeop node_id
{ D2Lmidedge (NODE, $2, portstr); portstr[0] = '\000'; }
| T_edgeop node_id
{ D2Lmidedge (NODE, $2, portstr); portstr[0] = '\000'; } edgeRHS
| T_edgeop subg_stmt
{ D2Lmidedge (GRAPH, $2, ""); portstr[0] = '\000'; }
| T_edgeop subg_stmt
{ D2Lmidedge (GRAPH, $2, ""); portstr[0] = '\000'; } edgeRHS
;
node_port: /* empty */
| port_location
| port_angle
| port_angle port_location
| port_location port_angle
;
port_location: ':' T_id
{
strcat (portstr, $2); free ($2);
}
| ':' '(' T_id ',' T_id ')'
{
strcat (portstr, "("); strcat (portstr, $3);
strcat (portstr, ","); strcat (portstr, $5);
strcat (portstr, ")");
free ($3), free ($5);
}
;
port_angle: '@' T_id
{
strcat (portstr, "@"); strcat (portstr, $2); free ($2);
}
;
attr_stmt: attr_class
{ inattrstmt = TRUE; }
attr_list
{ attrclass = GRAPH; inattrstmt = FALSE; }
| attr_set
{ attrclass = GRAPH; }
;
attr_class: T_graph
{ attrclass = GRAPH; }
| T_node
{ attrclass = NODE; }
| T_edge
{ attrclass = EDGE; }
;
opt_attr_list: rec_attr_list
;
rec_attr_list: rec_attr_list attr_list
| /* empty */
;
attr_list: '[' inside_attr_list ']'
;
inside_attr_list: attr_set optcomma inside_attr_list
| /* empty */
;
attr_set: T_id '=' T_id
{ D2Lsetattr ($1, $3); free ($1); free ($3); }
;
optcomma: /* empty */
| ','
;
subg_stmt: subg_hdr '{' stmt_list '}' %prec '{'
{ $$ = D2Lpopgraph (); }
| '{' { D2Lpushgraph (NULL); } stmt_list '}'
{ $$ = D2Lpopgraph (); }
| subg_hdr %prec T_subgraph
{ $$ = D2Lpopgraph (); }
;
subg_hdr: T_subgraph T_id
{ D2Lpushgraph ($2); free ($2); }
;
|
