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java_cup
Class symbol
java.lang.Objectjava_cup.symbol
- Direct Known Subclasses:
- non_terminal, terminal
- public abstract class symbol
- extends java.lang.Object
This abstract class serves as the base class for grammar symbols (i.e., both terminals and non-terminals). Each symbol has a name string, and a string giving the type of object that the symbol will be represented by on the runtime parse stack. In addition, each symbol maintains a use count in order to detect symbols that are declared but never used, and an index number that indicates where it appears in parse tables (index numbers are unique within terminals or non terminals, but not across both).
- Version:
- last updated: 7/3/96
| Field Summary | |
protected int |
_index
Index of this symbol (terminal or non terminal) in the parse tables. |
protected java.lang.String |
_name
String for the human readable name of the symbol. |
protected java.lang.String |
_stack_type
String for the type of object used for the symbol on the parse stack. |
protected int |
_use_count
Count of how many times the symbol appears in productions. |
| Constructor Summary | |
symbol(java.lang.String nm)
Constructor with default type. |
|
symbol(java.lang.String nm,
java.lang.String tp)
Full constructor. |
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| Method Summary | |
int |
index()
Index of this symbol (terminal or non terminal) in the parse tables. |
abstract boolean |
is_non_term()
Indicate if this is a non-terminal. |
java.lang.String |
name()
String for the human readable name of the symbol. |
void |
note_use()
Increment the use count. |
java.lang.String |
stack_type()
String for the type of object used for the symbol on the parse stack. |
java.lang.String |
toString()
Convert to a string. |
int |
use_count()
Count of how many times the symbol appears in productions. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Field Detail |
_name
protected java.lang.String _name
- String for the human readable name of the symbol.
_stack_type
protected java.lang.String _stack_type
- String for the type of object used for the symbol on the parse stack.
_use_count
protected int _use_count
- Count of how many times the symbol appears in productions.
_index
protected int _index
- Index of this symbol (terminal or non terminal) in the parse tables.
Note: indexes are unique among terminals and unique among non terminals,
however, a terminal may have the same index as a non-terminal, etc.
| Constructor Detail |
symbol
public symbol(java.lang.String nm, java.lang.String tp)
- Full constructor.
symbol
public symbol(java.lang.String nm)
- Constructor with default type.
| Method Detail |
name
public java.lang.String name()
- String for the human readable name of the symbol.
stack_type
public java.lang.String stack_type()
- String for the type of object used for the symbol on the parse stack.
use_count
public int use_count()
- Count of how many times the symbol appears in productions.
note_use
public void note_use()
- Increment the use count.
index
public int index()
- Index of this symbol (terminal or non terminal) in the parse tables.
Note: indexes are unique among terminals and unique among non terminals,
however, a terminal may have the same index as a non-terminal, etc.
is_non_term
public abstract boolean is_non_term()
- Indicate if this is a non-terminal. Here in the base class we
don't know, so this is abstract.
toString
public java.lang.String toString()
- Convert to a string.
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