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Java Source Code / Java Documentation » Parser » CUP develop » java_cup   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    java_cup.symbol       java_cup.non_terminal non_terminal public class non_terminal extends symbol (Code) This class represents a non-terminal symbol in the grammar. Each non terminal has a textual name, an index, and a string which indicates the type of object it will be implemented with at runtime (i.e. the class of object that will be pushed on the parse stack to represent it). version:    last updated: 11/25/95 author:    Scott Hudson Field Summary final public static  non_terminal START_nt      protected static  Hashtable _all      protected static  Hashtable _all_by_index      Table of all non terminals indexed by their index number. protected  terminal_set _first_set      First set for this non-terminal. protected  boolean _nullable      Nullability of this non terminal. protected  Hashtable _productions      Table of all productions with this non terminal on the LHS. public  boolean is_embedded_action      protected static  int next_index      Static counter to assign unique indexes. protected static  int next_nt      Constructor Summary public   non_terminal(String nm, String tp)      Full constructor. public   non_terminal(String nm)      Constructor with default type. Method Summary public  void add_production(production prod)      Add a production to our set of productions. public static  Enumeration all()      Access to all non-terminals. public static  void clear()      public static  void compute_first_sets()      Compute first sets for all non-terminals. public static  void compute_nullability()      Compute nullability of all non-terminals. static  non_terminal create_new(String prefix)      Method for creating a new uniquely named hidden non-terminal using the given string as a base for the name (or "NT$" if null is passed). Parameters:   prefix - base name to construct unique name from. static  non_terminal create_new()      static  non_terminal create_new(String prefix, String type)      public static  non_terminal find(String with_name)      public static  non_terminal find(int indx)      Lookup a non terminal by index. public  terminal_set first_set()      First set for this non-terminal. public  boolean is_non_term()      Indicate that this symbol is a non-terminal. protected  boolean looks_nullable()      Test to see if this non terminal currently looks nullable. public  boolean nullable()      Nullability of this non terminal. public  int num_productions()      Total number of productions with this non terminal on the LHS. public static  int number()      Total number of non-terminals. public  Enumeration productions()      Access to productions with this non terminal on the LHS. public  String toString()      Field Detail START_nt final public static non_terminal START_nt(Code) special non-terminal for start symbol _all protected static Hashtable _all(Code) Table of all non-terminals -- elements are stored using name strings as the key _all_by_index protected static Hashtable _all_by_index(Code) Table of all non terminals indexed by their index number. _first_set protected terminal_set _first_set(Code) First set for this non-terminal. _nullable protected boolean _nullable(Code) Nullability of this non terminal. _productions protected Hashtable _productions(Code) Table of all productions with this non terminal on the LHS. is_embedded_action public boolean is_embedded_action(Code) flag non-terminals created to embed action productions next_index protected static int next_index(Code) Static counter to assign unique indexes. next_nt protected static int next_nt(Code) Static counter for creating unique non-terminal names Constructor Detail non_terminal public non_terminal(String nm, String tp)(Code) Full constructor. Parameters:   nm - the name of the non terminal. Parameters:   tp - the type string for the non terminal. non_terminal public non_terminal(String nm)(Code) Constructor with default type. Parameters:   nm - the name of the non terminal. Method Detail add_production public void add_production(production prod) throws internal_error(Code) Add a production to our set of productions. all public static Enumeration all()(Code) Access to all non-terminals. clear public static void clear()(Code) compute_first_sets public static void compute_first_sets() throws internal_error(Code) Compute first sets for all non-terminals. This assumes nullability has already computed. compute_nullability public static void compute_nullability() throws internal_error(Code) Compute nullability of all non-terminals. create_new static non_terminal create_new(String prefix) throws internal_error(Code) Method for creating a new uniquely named hidden non-terminal using the given string as a base for the name (or "NT$" if null is passed). Parameters:   prefix - base name to construct unique name from. create_new static non_terminal create_new() throws internal_error(Code) static routine for creating a new uniquely named hidden non-terminal create_new static non_terminal create_new(String prefix, String type) throws internal_error(Code) TUM 20060608 bugfix for embedded action codes find public static non_terminal find(String with_name)(Code) lookup a non terminal by name string find public static non_terminal find(int indx)(Code) Lookup a non terminal by index. first_set public terminal_set first_set()(Code) First set for this non-terminal. is_non_term public boolean is_non_term()(Code) Indicate that this symbol is a non-terminal. looks_nullable protected boolean looks_nullable() throws internal_error(Code) Test to see if this non terminal currently looks nullable. nullable public boolean nullable()(Code) Nullability of this non terminal. num_productions public int num_productions()(Code) Total number of productions with this non terminal on the LHS. number public static int number()(Code) Total number of non-terminals. productions public Enumeration productions()(Code) Access to productions with this non terminal on the LHS. toString public String toString()(Code) convert to string Fields inherited from java_cup.symbol protected int _index(Code)(Java Doc) protected String _name(Code)(Java Doc) protected String _stack_type(Code)(Java Doc) protected int _use_count(Code)(Java Doc) Methods inherited from java_cup.symbol public int index()(Code)(Java Doc) abstract public boolean is_non_term()(Code)(Java Doc) public String name()(Code)(Java Doc) public void note_use()(Code)(Java Doc) public String stack_type()(Code)(Java Doc) public String toString()(Code)(Java Doc) public int use_count()(Code)(Java Doc) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)