@Test
public void shouldAllowTheSettingOfTheEnvironment() {
assertThat(Environment.get(), is(nullValue()));
assertThat(Environment.is(null), is(true));
assertThat(Environment.is("anything else"), is(false));
Environment.set("test");
assertThat(Environment.get(), is("test"));
assertThat(Environment.is("test"), is(true));
assertThat(Environment.is(null), is(false));
assertThat(Environment.is("Test"), is(false));
Environment.set("test2");
assertThat(Environment.get(), is("test2"));
assertThat(Environment.is("test2"), is(true));
assertThat(Environment.is("test"), is(false));
}
public VariableInfo getVariable(String id) {
VariableInfo vi = null;
for (Enumeration<Environment> e = this.elements(); e.hasMoreElements(); ) {
Environment env = e.nextElement();
vi = env.get(id);
if (vi != null) return vi;
}
return null;
}
@Override
public Object evaluate(Environment environment) {
Environment closure = new Environment(environment);
for (int i = 0; i < getNumberOfArguments(); i++) {
closure.set(variableNames[i], getArgument(i).evaluate(environment));
}
Node functionBody = environment.get(Node.class, functionName);
return functionBody.evaluate(closure);
}
public Object eval(Environment env) {
Object value = env.get(name());
if (value == null) throw new StoneException("undefined name: " + name(), this);
else return value;
}
/** Evalaution method for id Fact Nodes. Evaluates the id portion. */
public double eval(Environment env) throws EvalException {
return env.get(pos, id);
}
@Test
public final void test() {
final Environment<String, String> env = new Environment<String, String>();
env.put("x", "1");
env.put("y", "2");
assertEquals("1", env.get("x"));
assertEquals("2", env.get("y"));
env.put("x", "3");
assertEquals("3", env.get("x"));
assertEquals("2", env.get("y"));
env.beginScope();
assertEquals("3", env.get("x"));
assertEquals("2", env.get("y"));
env.put("x", "4");
assertEquals("4", env.get("x"));
assertEquals("2", env.get("y"));
env.beginScope();
assertEquals("4", env.get("x"));
assertEquals("2", env.get("y"));
env.put("y", "5");
env.put("z", "6");
assertEquals("4", env.get("x"));
assertEquals("5", env.get("y"));
assertEquals("6", env.get("z"));
env.endScope();
assertEquals("4", env.get("x"));
assertEquals("2", env.get("y"));
assertEquals(null, env.get("z"));
env.put("y", "7");
assertEquals("4", env.get("x"));
assertEquals("7", env.get("y"));
env.endScope();
assertEquals("3", env.get("x"));
assertEquals("2", env.get("y"));
}