complexsymbolfactory.java

java语法解释器生成器

package java_cup.runtime;

/**
 * Default Implementation for SymbolFactory, creates
 * plain old Symbols
 *
 * @version last updated 27-03-2006
 * @author Michael Petter
 */

/* *************************************************
  class DefaultSymbolFactory

  interface for creating new symbols  
 ***************************************************/
public class ComplexSymbolFactory implements SymbolFactory{
    public static class Location {
        private String unit="unknown";
        private int line, column;
        public Location(String unit, int line, int column){
            this.unit=unit;
            this.line=line;
            this.column=column;
        }
        public Location(int line, int column){
            this.line=line;
            this.column=column;
        }
        public String toString(){
            return unit+":"+line+"/"+column;
        }
        public int getColumn(){
            return column;
        }
        public int getLine(){
            return line;
        }
        public String getUnit(){
            return unit;
        }
    }
    /**
     * ComplexSymbol with detailed Location Informations and a Name
     */
    public static class ComplexSymbol extends Symbol {
        protected String name;
        protected Location xleft,xright;
        public ComplexSymbol(String name, int id) {
            super(id);
            this.name=name;
        }
        public ComplexSymbol(String name, int id, Object value) {
            super(id,value);
            this.name=name;
        }
        public String toString(){
            if (xleft==null || xright==null) return "Symbol: "+name;
            return "Symbol: "+name+" ("+xleft+" - "+xright+")";
        }
        public ComplexSymbol(String name, int id, int state) {
            super(id,state);
            this.name=name;
        }
        public ComplexSymbol(String name, int id, Symbol left, Symbol right) {
            super(id,left,right);
            this.name=name;
            if (left!=null)  this.xleft = ((ComplexSymbol)left).xleft;
            if (right!=null) this.xright= ((ComplexSymbol)right).xright;
        }
        public ComplexSymbol(String name, int id, Location left, Location right) {
            super(id);
            this.name=name;
            this.xleft=left;
            this.xright=right;
        }
        public ComplexSymbol(String name, int id, Symbol left, Symbol right, Object value) {
            super(id,value);
            this.name=name;
            if (left!=null)  this.xleft = ((ComplexSymbol)left).xleft;
            if (right!=null) this.xright= ((ComplexSymbol)right).xright;
        }
        public ComplexSymbol(String name, int id, Location left, Location right, Object value) {
            super(id,value);
            this.name=name;
            this.xleft=left;
            this.xright=right;
        }
        public Location getLeft(){
            return xleft;
        }
        public Location getRight(){
            return xright;
        }
    }


    // Factory methods
    public Symbol newSymbol(String name, int id, Location left, Location right, Object value){
        return new ComplexSymbol(name,id,left,right,value);
    }
    public Symbol newSymbol(String name, int id, Location left, Location right){
        return new ComplexSymbol(name,id,left,right);
    }
    public Symbol newSymbol(String name, int id, Symbol left, Symbol right, Object value){
        return new ComplexSymbol(name,id,left,right,value);
    }
    public Symbol newSymbol(String name, int id, Symbol left, Symbol right){
        return new ComplexSymbol(name,id,left,right);
    }
    public Symbol newSymbol(String name, int id){
        return new ComplexSymbol(name,id);
    }
    public Symbol newSymbol(String name, int id, Object value){
        return new ComplexSymbol(name,id,value);
    }
    public Symbol startSymbol(String name, int id, int state){
        return new ComplexSymbol(name,id,state);
    }
}