PC Online 1997 October/PCO1097.ISO/FilesBBS/WIN95/IAVAZIP.EXE/DATA.Z/Parser.class

Java Class File | 1997-08-18 | 2.8 KB | 198 lines

package com.sfs.vrml;

import java.io.IOException;
import java.io.InputStream;
import java.io.StreamTokenizer;
import java.util.Vector;

public class Parser {
   private StreamTokenizer _st;

   public Object parse() throws IOException, SyntaxError {
      return this.parseNode();
   }

   private Object parseRotation() throws IOException, SyntaxError {
      double var1 = (double)50.0F;
      double var3 = (double)0.0F;
      double var5 = (double)0.0F;
      double var7 = (Math.PI / 2D);

      while(true) {
         this._st.nextToken();
         if (this._st.ttype == 125) {
            double var9 = Math.sqrt(var1 * var1 + var3 * var3 + var5 * var5);
            var1 /= var9;
            var3 /= var9;
            var5 /= var9;
            return new Rotation((double)0.0F, (double)0.0F, (double)0.0F, var1, var3, var5, var7);
         }

         if (this._st.ttype != -3) {
            throw new SyntaxError("missing field name");
         }

         if (!this._st.sval.equals("rotation")) {
            throw new SyntaxError("invalid field name: " + this._st.sval);
         }

         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var1 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var3 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var5 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var7 = this._st.nval;
      }
   }

   private Object parseSeparator() throws IOException, SyntaxError {
      Vector var1 = new Vector();

      while(true) {
         this._st.nextToken();
         if (this._st.ttype == 125) {
            return var1;
         }

         this._st.pushBack();
         var1.addElement(this.parseNode());
      }
   }

   public Parser(InputStream var1) {
      this._st = new StreamTokenizer(var1);
   }

   private Object parseTranslation() throws IOException, SyntaxError {
      double var1 = (double)50.0F;
      double var3 = (double)0.0F;
      double var5 = (double)0.0F;

      while(true) {
         this._st.nextToken();
         if (this._st.ttype == 125) {
            return new Translation(var1, var3, var5);
         }

         if (this._st.ttype != -3) {
            throw new SyntaxError("missing field name");
         }

         if (!this._st.sval.equals("translation")) {
            throw new SyntaxError("invalid field name: " + this._st.sval);
         }

         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var1 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var3 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var5 = this._st.nval;
      }
   }

   private Object parseNode() throws IOException, SyntaxError {
      this._st.nextToken();
      if (this._st.ttype != -3) {
         throw new SyntaxError("missing node type");
      } else {
         String var1 = this._st.sval;
         this._st.nextToken();
         if (this._st.ttype != 123) {
            throw new SyntaxError("'{' expected");
         } else if (var1.equals("Separator")) {
            return this.parseSeparator();
         } else if (var1.equals("Triangle")) {
            return this.parseTriangle();
         } else if (var1.equals("Translation")) {
            return this.parseTranslation();
         } else if (var1.equals("Rotation")) {
            return this.parseRotation();
         } else {
            throw new SyntaxError("invalid node type: " + var1);
         }
      }
   }

   private Object parseTriangle() throws IOException, SyntaxError {
      Coordinates var1 = new Coordinates((double)0.0F, (double)0.0F, (double)0.0F);
      Coordinates var2 = new Coordinates((double)50.0F, (double)0.0F, (double)0.0F);
      Coordinates var3 = new Coordinates((double)50.0F, (double)0.0F, (double)50.0F);

      while(true) {
         this._st.nextToken();
         if (this._st.ttype == 125) {
            return new TriangleShape(var1, var2, var3);
         }

         if (this._st.ttype != -3) {
            throw new SyntaxError("missing field name");
         }

         String var4 = this._st.sval;
         double var5 = (double)0.0F;
         double var7 = (double)0.0F;
         double var9 = (double)0.0F;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var5 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var7 = this._st.nval;
         this._st.nextToken();
         if (this._st.ttype != -2) {
            throw new SyntaxError("missing field value");
         }

         var9 = this._st.nval;
         if (var4.equals("a")) {
            var1 = new Coordinates(var5, var7, var9);
         } else if (var4.equals("b")) {
            var2 = new Coordinates(var5, var7, var9);
         } else {
            if (!var4.equals("c")) {
               throw new SyntaxError("invalid field name: " + var4);
            }

            var3 = new Coordinates(var5, var7, var9);
         }
      }
   }
}