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 import org.slf4j.Logger;
   5 import org.slf4j.LoggerFactory;
   6
   7 public class Grammar implements Namer {
   8     private static final Logger LOGGER = LoggerFactory.getLogger(Grammar.class);
   9     public final Production[] productions;
  10     public final String[] terminalNames;
  11     public final String[] nonterminalNames;
  12     public final int[] initialNonterminals;
  13
  14     public Grammar(Production[] productions, String[] terminalNames,
  15             String[] nonterminalNames, int[] initialNonterminals) {
  16         this.productions = productions;
  17         this.terminalNames = terminalNames;
  18         this.nonterminalNames = nonterminalNames;
  19         this.initialNonterminals = initialNonterminals;
  20     }
  21
  22     public String getName(int symbolId) {
  23         if(symbolId >= 0)
  24             return terminalNames[symbolId];
  25         else
  26             return nonterminalNames[~symbolId];
  27     }
  28
  29     @Override
  30     public String toString() {
  31         StringBuilder b = new StringBuilder();
  32         for(Production prod : productions) {
  33             b.append(prod.toString(this));
  34             b.append("\n");
  35         }
  36         /*for(int i=0;i<terminalNames.length;++i)
  37             b.append(terminalNames[i]).append(' ').append(i).append('\n');*/
  38         return b.toString();
  39     }
  40
  41     public void check() {
  42         int[] prodCount = new int[nonterminalNames.length];
  43         for(Production prod : productions)
  44             ++prodCount[~prod.lhs];
  45         for(int i=0;i<nonterminalNames.length;++i)
  46             if(prodCount[i]==0)
  47                 LOGGER.error("Nonterminal " + nonterminalNames[i] + " does not have productions.");
  48     }
  49 }