/**
* Apply processing to a single node
*
* @param Node $node
*/
public function applyToNode(Node $node)
{
$expression = $node->getInstruction($this);
$ast = $this->getParser()->parse($expression);
$variables = $node->getResult() ?: [];
$arithmetic = new Hoa\Math\Visitor\Arithmetic();
foreach ($variables as $name => $value) {
// Constants are upper case and variables lower case. We don't really care, so using a workaround.
if (preg_match('/^[A-Z_][A-Z0-9_]*$/', $name)) {
$arithmetic->addConstant($name, $value);
} else {
$arithmetic->addVariable($name, function () use($value) {
return $value;
});
}
}
$result = $arithmetic->visit($ast);
$node->setResult($result);
}
public function case_visitor_exhaustively()
{
$this->given($sampler = new Compiler\Llk\Sampler\BoundedExhaustive(Compiler\Llk\Llk::load(new File\Read('hoa://Library/Math/Test/Unit/Arithmetic.pp')), new Regex\Visitor\Isotropic(new LUT\Sampler\Random()), 9), $compiler = Compiler\Llk\Llk::load(new File\Read('hoa://Library/Math/Arithmetic.pp')), $visitor = new CUT())->executeOnFailure(function () use(&$expression) {
echo 'Failed expression: ', $expression, '.', "\n";
})->when(function () use(&$sampler, &$compiler, &$visitor) {
foreach ($sampler as $expression) {
$dump = $expression;
try {
$x = (double) $visitor->visit($compiler->parse($expression));
} catch (\Exception $e) {
continue;
}
eval('$y = (float) ' . $expression . ';');
if (is_nan($x) || is_nan($y)) {
$this->boolean(true);
continue;
}
$this->float($x)->isNearlyEqualTo($y);
}
});
}
/**
* The entry method.
*
* @return int
*/
public function main()
{
while (false !== ($c = $this->getOption($v))) {
switch ($c) {
case 'h':
case '?':
return $this->usage();
case '__ambiguous':
$this->resolveOptionAmbiguity($v);
break;
}
}
$this->parser->listInputs($expression);
$compiler = Compiler\Llk::load(new File\Read('hoa://Library/Math/Arithmetic.pp'));
$visitor = new Math\Visitor\Arithmetic();
$dump = new Compiler\Visitor\Dump();
if (null !== $expression) {
$ast = $compiler->parse($expression);
echo $expression . ' = ' . $visitor->visit($ast), "\n";
return;
}
$readline = new Console\Readline();
$readline->setAutocompleter(new Console\Readline\Autocompleter\Word(array_merge(array_keys($visitor->getConstants()->getArrayCopy()), array_keys($visitor->getFunctions()->getArrayCopy()))));
$handle = null;
$expression = 'h';
do {
switch ($expression) {
case 'h':
case 'help':
echo 'Usage:', "\n", ' h[elp] to print this help;', "\n", ' c[onstants] to print available constants;', "\n", ' f[unctions] to print available functions;', "\n", ' e[xpression] to print the current expression;', "\n", ' d[ump] to dump the tree of the expression;', "\n", ' q[uit] to quit.', "\n";
break;
case 'c':
case 'constants':
echo implode(', ', array_keys($visitor->getConstants()->getArrayCopy())), "\n";
break;
case 'f':
case 'functions':
echo implode(', ', array_keys($visitor->getFunctions()->getArrayCopy())), "\n";
break;
case 'e':
case 'expression':
echo $handle, "\n";
break;
case 'd':
case 'dump':
if (null === $handle) {
echo 'Type a valid expression before (“> 39 + 3”).', "\n";
} else {
echo $dump->visit($compiler->parse($handle)), "\n";
}
break;
case 'q':
case 'quit':
break 2;
default:
if (null === $expression) {
break;
}
try {
echo $visitor->visit($compiler->parse($expression)), "\n";
} catch (Compiler\Exception $e) {
echo $e->getMessage(), "\n";
break;
}
$handle = $expression;
break;
}
} while (false !== ($expression = $readline->readLine('> ')));
return;
}
public function case_change_default_context()
{
$this->given($compiler = Compiler\Llk\Llk::load(new File\Read('hoa://Library/Math/Arithmetic.pp')), $visitor = new CUT(), $context = new \Mock\Hoa\Math\Context(), $variableName = 'a_variable', $variableValue = 42)->when($context->addVariable($variableName, function () use($variableValue) {
return $variableValue;
}))->then->object($visitor->setContext($context))->isNotIdenticalTo($context)->object($visitor->getContext())->isIdenticalTo($context)->float($visitor->visit($compiler->parse('abs(' . $variableName . ' - PI)')))->isEqualTo(abs($variableValue - M_PI))->mock($context)->call('getFunction')->withArguments('abs')->once->call('getVariable')->withArguments($variableName)->once->call('getConstant')->withArguments('PI')->once;
}
