Android Open Source - splott Syntax Checker

From Project

Back to project page splott.

License

The source code is released under:

MIT License

If you think the Android project splott listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package com.wordsaretoys.splott.parser;
/*from  w  ww.  j ava 2 s  .com*/
import java.util.BitSet;

import org.antlr.v4.runtime.ANTLRErrorListener;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.atn.ATNConfigSet;
import org.antlr.v4.runtime.dfa.DFA;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Nullable;

/**
 * attempts to parse equation
 * and returns error state
 */
public class SyntaxChecker {

  int errors;

  public int parse(String eq) {
        // generate the parse tree
        ANTLRInputStream input = new ANTLRInputStream(eq);
        SurfaceLexer lexer = new SurfaceLexer(input);
        CommonTokenStream tokens = new CommonTokenStream(lexer);
        SurfaceParser parser = new SurfaceParser(tokens);
        parser.addErrorListener(new ANTLRErrorListener() {
      @Override
      public void reportAmbiguity(@NotNull Parser arg0, @NotNull DFA arg1, int arg2, int arg3, boolean arg4,@Nullable BitSet arg5, @NotNull ATNConfigSet arg6) {
        errors++;
      }
      @Override
      public void reportAttemptingFullContext(@NotNull Parser arg0, @NotNull DFA arg1, int arg2, int arg3, @Nullable BitSet arg4, @NotNull ATNConfigSet arg5) {
        errors++;
      }
      @Override
      public void reportContextSensitivity(@NotNull Parser arg0, @NotNull DFA arg1, int arg2, int arg3, int arg4, @NotNull ATNConfigSet arg5) {
        errors++;
      }
      @Override
      public void syntaxError(@NotNull Recognizer<?, ?> arg0, @Nullable Object arg1, int arg2, int arg3, @NotNull String arg4, @Nullable RecognitionException arg5) {
        errors++;
      }
        });
        errors = 0;
        parser.surface();
        return errors;
  }

}

Java Source Code List