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/*
Copyright (C) 2014- The University of Notre Dame
This software is distributed under the GNU General Public License.
See the file COPYING for details.
*/
#ifndef DAG_VARIABLE_H
#define DAG_VARIABLE_H
/*
* dag_variable_value records a single instance of a variable's value and location
*/
struct dag_variable_value {
int nodeid; /* The nodeid of the rule to which this value binding takes effect. */
int size; /* memory size allocated for value */
int len; /* records strlen(value) */
char *value; /* The value of the variable. */
};
struct dag_variable_value *dag_variable_value_create(const char *value);
struct dag_variable_value *dag_variable_value_append_or_create(struct dag_variable_value *v, const char *value);
void dag_variable_value_free(struct dag_variable_value *v);
/*
* dag_variable tracks all of the locations of a variable's value
*/
struct dag_variable {
int count;
struct dag_variable_value **values;
};
struct dag_variable *dag_variable_create(const char *name, const char *initial_value);
void dag_variable_add_value(const char *name, struct hash_table *current_table, int nodeid, const char *value);
struct dag_variable_value *dag_variable_get_value(const char *name, struct hash_table *t, int node_id);
/*
* dag_lookup_set indicates all of the places where a variable might be bound.
* To use, set all members to the items of interest (or null) and then call
* dag_lookup to query those locations.
*/
struct dag_variable_lookup_set {
struct dag *dag;
struct category *category;
struct dag_node *node;
struct hash_table *table;
};
/* Count the number of times the variable was defined */
int dag_variable_count(const char *name, struct dag_variable_lookup_set *s);
/* Look up a variable in multiple scopes and return the (constant) structure. */
struct dag_variable_value *dag_variable_lookup(const char *name, struct dag_variable_lookup_set *s );
/* Look up a variable in multiple scopes and return the value, strdup'd. */
char *dag_variable_lookup_string(const char *name, struct dag_variable_lookup_set *s );
/* Look up a variable only at dag scope and return the value, strdup'd. */
char *dag_variable_lookup_global_string(const char *name, struct dag *d );
#endif
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