示例#1
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  @Test
  public void testPrependToProtectedList() throws SyntaxException, InvalidTermException {

    Context context = new CompileTimeContext();

    // Create a protected resource.
    ListResource list = new ListResource();
    list = (ListResource) list.protect();

    Element value = StringProperty.getInstance("OK");

    Operation dml = Prepend.getInstance(null, list, value);

    Element result = context.executeDmlBlock(dml);

    // Check that the list argument has NOT been updated.
    assertTrue(list.size() == 0);

    // Verify that a copy has been made.
    assertTrue(result != list);

    // It must also be a list.
    assertTrue(result instanceof ListResource);

    // Verify that the new list has the correct value.
    Element element = ((ListResource) result).get(TermFactory.create(0));
    assertTrue(value == element);
  }
示例#2
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  @Test
  public void testNoIterations() throws SyntaxException {

    // Create the loop.
    Operation op =
        new Foreach(
            null,
            new SetValue(null, "k", new Operation[] {}),
            new SetValue(null, "v", new Operation[] {}),
            new HashResource(),
            BooleanProperty.TRUE);

    // Run the operation.
    Context context = new CompileTimeContext();
    Element r1 = op.execute(context);

    // Check the value.
    assertTrue(r1 instanceof Undef);

    // Check side-effects of the loop.
    Element k = context.getLocalVariable("k");
    Element v = context.getLocalVariable("v");
    assertTrue(k instanceof Undef);
    assertTrue(v instanceof Undef);
  }
示例#3
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  @Test
  public void testPrependToList() throws SyntaxException, InvalidTermException {

    Context context = new CompileTimeContext();
    ListResource list = new ListResource();
    Element value = StringProperty.getInstance("OK");

    Operation dml = Prepend.getInstance(null, list, value);

    Element result = context.executeDmlBlock(dml);

    // Check that the list argument has been updated.
    assertTrue(list.size() == 1);
    Element element = list.get(TermFactory.create(0));
    assertTrue(value == element);

    // Verify that the same list is given as the result.
    assertTrue(result == list);
  }
示例#4
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  private static Element runDefaultDml(Operation dml) throws SyntaxException {

    // If the argument is null, return null as the value immediately.
    if (dml == null) {
      return null;
    }

    // Create a nearly empty execution context. There are no global
    // variables by default (including no 'self' variable). Only the
    // standard built-in functions are accessible.
    Context context = new CompileTimeContext();

    Element value = null;

    // IF this is an AbstractOperation, pull out the source location.
    SourceRange sourceRange = null;
    if (dml instanceof AbstractOperation) {
      AbstractOperation op = (AbstractOperation) dml;
      sourceRange = op.getSourceRange();
    }

    // Execute the DML block. The block must evaluate to an Element. Any
    // error is fatal for the compilation.
    try {
      value = context.executeDmlBlock(dml);
    } catch (EvaluationException ee) {
      SyntaxException se = SyntaxException.create(sourceRange, MSG_DEF_VALUE_NOT_CONSTANT);
      se.initCause(ee);
      throw se;
    }

    // The default value cannot be either undef or null. Throw a syntax
    // error if that is the case.
    if (value instanceof Undef) {
      throw SyntaxException.create(sourceRange, MSG_DEF_VALUE_CANNOT_BE_UNDEF);
    } else if (value instanceof Null) {
      throw SyntaxException.create(sourceRange, MSG_DEF_VALUE_CANNOT_BE_UNDEF);
    }

    // Looks Ok; return the value.
    return value;
  }
示例#5
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  @Override
  public Element execute(Context context) {

    // Look up the variable.
    Element result = context.getVariable(identifier);

    // Return an error if the variable doesn't exist.
    if (result == null && !lookupOnly) {
      throw new EvaluationException(
          MessageUtils.format(MSG_UNDEFINED_VAR, identifier), sourceRange, context);
    }

    return result;
  }