Source Code Cross Referenced for symbol.java in  » Parser » CUP-develop » java_cup » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » CUP develop » java_cup 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package java_cup;
002:
003:        /** This abstract class serves as the base class for grammar symbols (i.e.,
004:         * both terminals and non-terminals).  Each symbol has a name string, and
005:         * a string giving the type of object that the symbol will be represented by
006:         * on the runtime parse stack.  In addition, each symbol maintains a use count
007:         * in order to detect symbols that are declared but never used, and an index
008:         * number that indicates where it appears in parse tables (index numbers are
009:         * unique within terminals or non terminals, but not across both).
010:         *
011:         * @see     java_cup.terminal
012:         * @see     java_cup.non_terminal
013:         * @version last updated: 7/3/96
014:         * @author  Frank Flannery
015:         */
016:        public abstract class symbol {
017:            /*-----------------------------------------------------------*/
018:            /*--- Constructor(s) ----------------------------------------*/
019:            /*-----------------------------------------------------------*/
020:
021:            /** Full constructor.
022:             * @param nm the name of the symbol.
023:             * @param tp a string with the type name.
024:             */
025:            public symbol(String nm, String tp) {
026:                /* sanity check */
027:                if (nm == null)
028:                    nm = "";
029:
030:                /* apply default if no type given */
031:                if (tp == null)
032:                    tp = "Object";
033:
034:                _name = nm;
035:                _stack_type = tp;
036:            }
037:
038:            /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
039:
040:            /** Constructor with default type. 
041:             * @param nm the name of the symbol.
042:             */
043:            public symbol(String nm) {
044:                this (nm, null);
045:            }
046:
047:            /*-----------------------------------------------------------*/
048:            /*--- (Access to) Instance Variables ------------------------*/
049:            /*-----------------------------------------------------------*/
050:
051:            /** String for the human readable name of the symbol. */
052:            protected String _name;
053:
054:            /** String for the human readable name of the symbol. */
055:            public String name() {
056:                return _name;
057:            }
058:
059:            /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
060:
061:            /** String for the type of object used for the symbol on the parse stack. */
062:            protected String _stack_type;
063:
064:            /** String for the type of object used for the symbol on the parse stack. */
065:            public String stack_type() {
066:                return _stack_type;
067:            }
068:
069:            /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
070:
071:            /** Count of how many times the symbol appears in productions. */
072:            protected int _use_count = 0;
073:
074:            /** Count of how many times the symbol appears in productions. */
075:            public int use_count() {
076:                return _use_count;
077:            }
078:
079:            /** Increment the use count. */
080:            public void note_use() {
081:                _use_count++;
082:            }
083:
084:            /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
085:
086:            /** Index of this symbol (terminal or non terminal) in the parse tables.
087:             *  Note: indexes are unique among terminals and unique among non terminals,
088:             *  however, a terminal may have the same index as a non-terminal, etc. 
089:             */
090:            protected int _index;
091:
092:            /** Index of this symbol (terminal or non terminal) in the parse tables.
093:             *  Note: indexes are unique among terminals and unique among non terminals,
094:             *  however, a terminal may have the same index as a non-terminal, etc. 
095:             */
096:            public int index() {
097:                return _index;
098:            }
099:
100:            /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
101:
102:            /** Indicate if this is a non-terminal.  Here in the base class we
103:             *  don't know, so this is abstract.  
104:             */
105:            public abstract boolean is_non_term();
106:
107:            /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
108:
109:            /** Convert to a string. */
110:            public String toString() {
111:                return name();
112:            }
113:
114:            /*-----------------------------------------------------------*/
115:
116:        }
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