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chore(doc): document all ast code by explaining what it generates #6

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Sep 28, 2023
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chore(doc): document all ast code by explaining what it generates #6

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50 changes: 45 additions & 5 deletions src/Extractor/ReadAccessor.php
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Original file line number Diff line number Diff line change
Expand Up @@ -53,11 +53,11 @@ public function getExpression(Expr\Variable $input): Expr

foreach ($parameters as $parameter) {
if ($attribute = ($parameter->getAttributes(MapToContext::class)[0] ?? null)) {
// generates code similar to:
// $value->getValue(
// $context['map_to_accessor_parameter']['some_key'] ?? throw new \InvalidArgumentException('error message');
// )

/*
* Create method call argument to read value from context and throw exception if not found
*
* $context['map_to_accessor_parameter']['some_key'] ?? throw new \InvalidArgumentException('error message');
*/
$methodCallArguments[] = new Arg(
new Expr\BinaryOp\Coalesce(
new Expr\ArrayDimFetch(
Expand Down Expand Up @@ -88,6 +88,13 @@ public function getExpression(Expr\Variable $input): Expr
}

if ($this->private) {
/*
* When the method is private we use the extract callback that can read this value
*
* @see \AutoMapper\Extractor\ReadAccessor::getExtractCallback()
*
* $this->extractCallbacks['method_name']($input)
*/
return new Expr\FuncCall(
new Expr\ArrayDimFetch(new Expr\PropertyFetch(new Expr\Variable('this'), 'extractCallbacks'), new Scalar\String_($this->name ?? $this->accessor)),
[
Expand All @@ -96,11 +103,23 @@ public function getExpression(Expr\Variable $input): Expr
);
}

/*
* Use the method call to read the value
*
* $input->method_name(...$args)
*/
return new Expr\MethodCall($input, $this->accessor, $methodCallArguments);
}

if (self::TYPE_PROPERTY === $this->type) {
if ($this->private) {
/*
* When the property is private we use the extract callback that can read this value
*
* @see \AutoMapper\Extractor\ReadAccessor::getExtractCallback()
*
* $this->extractCallbacks['property_name']($input)
*/
return new Expr\FuncCall(
new Expr\ArrayDimFetch(new Expr\PropertyFetch(new Expr\Variable('this'), 'extractCallbacks'), new Scalar\String_($this->accessor)),
[
Expand All @@ -109,10 +128,20 @@ public function getExpression(Expr\Variable $input): Expr
);
}

/*
* Use the property fetch to read the value
*
* $input->property_name
*/
return new Expr\PropertyFetch($input, $this->accessor);
}

if (self::TYPE_ARRAY_DIMENSION === $this->type) {
/*
* Use the array dim fetch to read the value
*
* $input['property_name']
*/
return new Expr\ArrayDimFetch($input, new Scalar\String_($this->accessor));
}

Expand All @@ -132,6 +161,17 @@ public function getExtractCallback(string $className): ?Expr
return null;
}

/*
* Create extract callback for this accessor
*
* \Closure::bind(function ($object) {
* return $object->property_name;
* }, null, $className)
*
* \Closure::bind(function ($object) {
* return $object->method_name();
* }, null, $className)
*/
return new Expr\StaticCall(new Name\FullyQualified(\Closure::class), 'bind', [
new Arg(
new Expr\Closure([
Expand Down
28 changes: 28 additions & 0 deletions src/Extractor/WriteMutator.php
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Original file line number Diff line number Diff line change
Expand Up @@ -41,13 +41,23 @@ public function __construct(
public function getExpression(Expr\Variable $output, Expr $value, bool $byRef = false): ?Expr
{
if (self::TYPE_METHOD === $this->type || self::TYPE_ADDER_AND_REMOVER === $this->type) {
/*
* Create method call expression to write value
*
* $output->method($value);
*/
return new Expr\MethodCall($output, $this->name, [
new Arg($value),
]);
}

if (self::TYPE_PROPERTY === $this->type) {
if ($this->private) {
/*
* Use hydrate callback to write value
*
* $this->hydrateCallbacks['propertyName']($output, $value);
*/
return new Expr\FuncCall(
new Expr\ArrayDimFetch(new Expr\PropertyFetch(new Expr\Variable('this'), 'hydrateCallbacks'), new Scalar\String_($this->name)),
[
Expand All @@ -56,6 +66,12 @@ public function getExpression(Expr\Variable $output, Expr $value, bool $byRef =
]
);
}

/*
* Create property expression to write value
*
* $output->propertyName &= $value;
*/
if ($byRef) {
return new Expr\AssignRef(new Expr\PropertyFetch($output, $this->name), $value);
}
Expand All @@ -64,6 +80,11 @@ public function getExpression(Expr\Variable $output, Expr $value, bool $byRef =
}

if (self::TYPE_ARRAY_DIMENSION === $this->type) {
/*
* Create array write expression to write value
*
* $output['propertyName'] &= $value;
*/
if ($byRef) {
return new Expr\AssignRef(new Expr\ArrayDimFetch($output, new Scalar\String_($this->name)), $value);
}
Expand All @@ -83,6 +104,13 @@ public function getHydrateCallback(string $className): ?Expr
return null;
}

/*
* Create hydrate callback for this mutator
*
* \Closure::bind(function ($object, $value) {
* $object->propertyName = $value;
* }, null, $className)
*/
return new Expr\StaticCall(new Name\FullyQualified(\Closure::class), 'bind', [
new Arg(new Expr\Closure([
'params' => [
Expand Down
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