bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/grammar/Grammar.java

   1 package org.simantics.scl.compiler.parser.grammar;
   2
   3 import org.simantics.scl.compiler.parser.regexp.Namer;
   4
   5 public class Grammar implements Namer {
   6     public final Production[] productions;
   7     public final String[] terminalNames;
   8     public final String[] nonterminalNames;
   9     public final int[] initialNonterminals;
  10
  11     public Grammar(Production[] productions, String[] terminalNames,
  12             String[] nonterminalNames, int[] initialNonterminals) {
  13         this.productions = productions;
  14         this.terminalNames = terminalNames;
  15         this.nonterminalNames = nonterminalNames;
  16         this.initialNonterminals = initialNonterminals;
  17     }
  18
  19     public String getName(int symbolId) {
  20         if(symbolId >= 0)
  21             return terminalNames[symbolId];
  22         else
  23             return nonterminalNames[~symbolId];
  24     }
  25
  26     @Override
  27     public String toString() {
  28         StringBuilder b = new StringBuilder();
  29         for(Production prod : productions) {
  30             b.append(prod.toString(this));
  31             b.append("\n");
  32         }
  33         /*for(int i=0;i<terminalNames.length;++i)
  34             b.append(terminalNames[i]).append(' ').append(i).append('\n');*/
  35         return b.toString();
  36     }
  37
  38     public void check() {
  39         int[] prodCount = new int[nonterminalNames.length];
  40         for(Production prod : productions)
  41             ++prodCount[~prod.lhs];
  42         for(int i=0;i<nonterminalNames.length;++i)
  43             if(prodCount[i]==0)
  44                 System.err.println("Nonterminal " + nonterminalNames[i] + " does not have productions.");
  45     }
  46 }