Examples of org.stringtemplate.v4.Interpreter$ObjectList

org.stringtemplate.v4.ST
This class knows how to execute template bytecodes relative to a particular {@link STGroup}. To execute the byte codes, we need an output stream and a reference to an {@link ST} instance. That instance's {@link ST#impl} fieldpoints at a {@link CompiledST}, which contains all of the byte codes and other information relevant to execution.
This interpreter is a stack-based bytecode interpreter. All operands go onto an operand stack.

If {@link #debug} set, we track interpreter events. For now, I am onlytracking instance creation events. These are used by {@link STViz} to pair upoutput chunks with the template expressions that generate them.

We create a new interpreter for each invocation of {@link ST#render}, {@link ST#inspect}, or {@link ST#getEvents}.

    @Override
    public ST genExpr(CodeGenerator generator,
                    STGroup templates,
                    DFA dfa)
    {
      ST result = null;
      for (SemanticContext operand : operands) {
        if (result == null) {
          result = operand.genExpr(generator, templates, dfa);
          continue;
        }


        ST eST;
        if ( templates!=null ) {
          eST = templates.getInstanceOf("andPredicates");
        }
        else {
          eST = new ST("(<left>&&<right>)");
        }
        eST.add("left", result);
        eST.add("right", operand.genExpr(generator,templates,dfa));
        result = eST;
      }


      return result;
    }

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    @Override
    public ST genExpr(CodeGenerator generator,
                    STGroup templates,
                    DFA dfa)
    {
      ST eST;
      if ( templates!=null ) {
        eST = templates.getInstanceOf("orPredicates");
      }
      else {
        eST = new ST("(<operands; separator=\"||\">)");
      }
      for (SemanticContext semctx : operands) {
        eST.add("operands", semctx.genExpr(generator,templates,dfa));
      }
      return eST;
    }

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    @Override
    public ST genExpr(CodeGenerator generator,
                    STGroup templates,
                    DFA dfa)
    {
      ST eST;
      if ( templates!=null ) {
        eST = templates.getInstanceOf("notPredicate");
      }
      else {
        eST = new ST("!(<pred>)");
      }
      eST.add("pred", ctx.genExpr(generator,templates,dfa));
      return eST;
    }

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    this.cycles = cycles;
  }


  @Override
  public String toString() {
    ST st = getMessageTemplate();
    st.add("listOfCycles", cycles);
    return super.toString(st);
  }

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        // add output vocab file; e.g., T.tokens. This is always generated to
        // the base output directory, which will be just . if there is no -o option
        //
        files.add(new File(tool.getOutputDirectory(), generator.getVocabFileName()));
        // are we generating a .h file?
        ST headerExtST = null;
        ST extST = generator.getTemplates().getInstanceOf("codeFileExtension");
        if (generator.getTemplates().isDefined("headerFile")) {
            headerExtST = generator.getTemplates().getInstanceOf("headerFileExtension");
            String suffix = Grammar.grammarTypeToFileNameSuffix[grammar.type];
            String fileName = grammar.name + suffix + headerExtST.render();
            files.add(new File(outputDir, fileName));
        }
        if (grammar.type == Grammar.COMBINED) {
            // add autogenerated lexer; e.g., TLexer.java TLexer.h TLexer.tokens
            // don't add T__.g (just a temp file)
            
            String suffix = Grammar.grammarTypeToFileNameSuffix[Grammar.LEXER];
            String lexer = grammar.name + suffix + extST.render();
            files.add(new File(outputDir, lexer));


            // TLexer.h
            if (headerExtST != null) {
                String header = grammar.name + suffix + headerExtST.render();
                files.add(new File(outputDir, header));
            }
        // for combined, don't generate TLexer.tokens
        }


        // handle generated files for imported grammars
        List<Grammar> imports =
                grammar.composite.getDelegates(grammar.composite.getRootGrammar());
        for (Grammar g : imports) {
            outputDir = tool.getOutputDirectory(g.getFileName());
            String fname = groomQualifiedFileName(outputDir.toString(), g.getRecognizerName() + extST.render());
            files.add(new File(fname));
        }


        if (files.isEmpty()) {
            return null;

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        return files;
    }


    public ST getDependencies() {
        loadDependencyTemplates();
        ST dependenciesST = templates.getInstanceOf("dependencies");
        dependenciesST.add("in", getDependenciesFileList());
        dependenciesST.add("out", getGeneratedFileList());
        dependenciesST.add("grammarFileName", grammar.fileName);
        return dependenciesST;
    }

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    String fileName = probe.dfa.nfa.grammar.getFileName();
    if ( fileName!=null ) {
      file = fileName;
    }


    ST st = getMessageTemplate();
    String ruleName = probe.dfa.getNFADecisionStartState().enclosingRule.name;
    st.add("ruleName", ruleName);
    List<Integer> sortedAlts = new ArrayList<Integer>();
    sortedAlts.addAll(altsWithRecursion);
    Collections.sort(sortedAlts); // make sure it's 1, 2, ...
    st.add("alts", sortedAlts);


    return super.toString(st);
  }

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    Grammar g = new Grammar(grammarStr);


    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    ST recogST = generator.genRecognizer();
    String code = recogST.render();
    assertTrue("not expecting label", code.indexOf("x=b();")<0);


    assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
  }

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  protected void writeTestFile(String parserName,
                 String lexerName,
                 String parserStartRuleName,
                 boolean debug)
  {
    ST outputFileST = new ST(
      "import org.antlr.runtime.*;\n" +
      "import org.antlr.runtime.tree.*;\n" +
      "import org.antlr.runtime.debug.*;\n" +
      "\n" +
      "class Profiler2 extends Profiler {\n" +
      "    public void terminate() { ; }\n" +
      "}\n"+
      "public class Test {\n" +
      "    public static void main(String[] args) throws Exception {\n" +
      "        CharStream input = new ANTLRFileStream(args[0]);\n" +
      "        <lexerName> lex = new <lexerName>(input);\n" +
      "        CommonTokenStream tokens = new CommonTokenStream(lex);\n" +
      "        <createParser>\n"+
      "        parser.<parserStartRuleName>();\n" +
      "    }\n" +
      "}"
      );
    ST createParserST =
      new ST(
      "        Profiler2 profiler = new Profiler2();\n"+
      "        <parserName> parser = new <parserName>(tokens,profiler);\n" +
      "        profiler.setParser(parser);\n");
    if ( !debug ) {
      createParserST =
        new ST(
        "        <parserName> parser = new <parserName>(tokens);\n");
    }
    outputFileST.add("createParser", createParserST);
    outputFileST.add("parserName", parserName);
    outputFileST.add("lexerName", lexerName);

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    outputFileST.add("parserStartRuleName", parserStartRuleName);
    writeFile(tmpdir, "Test.java", outputFileST.render());
  }


  protected void writeLexerTestFile(String lexerName, boolean debug) {
    ST outputFileST = new ST(
      "import org.antlr.runtime.*;\n" +
      "import org.antlr.runtime.tree.*;\n" +
      "import org.antlr.runtime.debug.*;\n" +
      "\n" +
      "class Profiler2 extends Profiler {\n" +
      "    public void terminate() { ; }\n" +
      "}\n"+
      "public class Test {\n" +
      "    public static void main(String[] args) throws Exception {\n" +
      "        CharStream input = new ANTLRFileStream(args[0]);\n" +
      "        <lexerName> lex = new <lexerName>(input);\n" +
      "        CommonTokenStream tokens = new CommonTokenStream(lex);\n" +
      "        System.out.println(tokens);\n" +
      "    }\n" +
      "}"
      );
    outputFileST.add("lexerName", lexerName);
    writeFile(tmpdir, "Test.java", outputFileST.render());
  }

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