Version 5.0 The LEDA User Manual

ool (*gml node rule)(const gml object*, graph*, node), the type for edge rules
is bool (*gml edge rule)(const gml object*, graph*, edge), and the type for
graph rules is bool (*gml graph rule)(const gml object*, graph*). A GML
object is represented by an instance of class gml object. You can get its
value by using double gml object::get double(), int gml object::get int() or
char* gml object::get string(). If one of your rules returns false during parsing,
then parsing fails and the graph is cleared.
#include < LEDA/graph/gml graph.h >
2. Creation
gml graph parser(graph& G);
creates an instance parser of type gml graph and initializes it for
graph G.
gml graph parser(graph& G, const char ∗ filename);
creates an instance parser of type gml graph and reads graph G
from the file filename.
gml graph parser(graph& G, istream& ins);
creates an instance parser of type gml graph and reads graph G
from the input stream ins.
3. Operations
3.1 Parsing
bool
bool
parser.parse(const char ∗ filename)
parser.parse(istream& ins)
parses the input taken from the file filename using the current
set of rules. The graph specified in the constructor is
set up accordingly. This operations returns false and clears
the graph, if syntax or parse errors occur. Otherwise true is
returned.
parses the input taken from the input stream ins.
bool parser.parse string(string s)
3.2 Path Manipulation
parses the input taken from string s.
void parser.reset path( )
resets the current path to the empty path.