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Edit File : TreeInterpreter.php \| Size : 7.64 KB
<?php namespace JmesPath; /** * Tree visitor used to evaluates JMESPath AST expressions. / class TreeInterpreter { /* @var callable / private $fnDispatcher; /* * @param callable $fnDispatcher Function dispatching function that accepts * a function name argument and an array of * function arguments and returns the result. / public function __construct(callable $fnDispatcher = null) { $this->fnDispatcher = $fnDispatcher ?: FnDispatcher::getInstance(); } /* * Visits each node in a JMESPath AST and returns the evaluated result. * * @param array $node JMESPath AST node * @param mixed $data Data to evaluate * * @return mixed / public function visit(array $node, $data) { return $this->dispatch($node, $data); } /* * Recursively traverses an AST using depth-first, pre-order traversal. * The evaluation logic for each node type is embedded into a large switch * statement to avoid the cost of "double dispatch". * @return mixed / private function dispatch(array $node, $value) { $dispatcher = $this->fnDispatcher; switch ($node['type']) { case 'field': if (is_array($value) \|\| $value instanceof \ArrayAccess) { return isset($value[$node['value']]) ? $value[$node['value']] : null; } elseif ($value instanceof \stdClass) { return isset($value->{$node['value']}) ? $value->{$node['value']} : null; } return null; case 'subexpression': return $this->dispatch( $node['children'][1], $this->dispatch($node['children'][0], $value) ); case 'index': if (!Utils::isArray($value)) { return null; } $idx = $node['value'] >= 0 ? $node['value'] : $node['value'] + count($value); return isset($value[$idx]) ? $value[$idx] : null; case 'projection': $left = $this->dispatch($node['children'][0], $value); switch ($node['from']) { case 'object': if (!Utils::isObject($left)) { return null; } break; case 'array': if (!Utils::isArray($left)) { return null; } break; default: if (!is_array($left) \|\| !($left instanceof \stdClass)) { return null; } } $collected = []; foreach ((array) $left as $val) { $result = $this->dispatch($node['children'][1], $val); if ($result !== null) { $collected[] = $result; } } return $collected; case 'flatten': static $skipElement = []; $value = $this->dispatch($node['children'][0], $value); if (!Utils::isArray($value)) { return null; } $merged = []; foreach ($value as $values) { // Only merge up arrays lists and not hashes if (is_array($values) && isset($values[0])) { $merged = array_merge($merged, $values); } elseif ($values !== $skipElement) { $merged[] = $values; } } return $merged; case 'literal': return $node['value']; case 'current': return $value; case 'or': $result = $this->dispatch($node['children'][0], $value); return Utils::isTruthy($result) ? $result : $this->dispatch($node['children'][1], $value); case 'and': $result = $this->dispatch($node['children'][0], $value); return Utils::isTruthy($result) ? $this->dispatch($node['children'][1], $value) : $result; case 'not': return !Utils::isTruthy( $this->dispatch($node['children'][0], $value) ); case 'pipe': return $this->dispatch( $node['children'][1], $this->dispatch($node['children'][0], $value) ); case 'multi_select_list': if ($value === null) { return null; } $collected = []; foreach ($node['children'] as $node) { $collected[] = $this->dispatch($node, $value); } return $collected; case 'multi_select_hash': if ($value === null) { return null; } $collected = []; foreach ($node['children'] as $node) { $collected[$node['value']] = $this->dispatch( $node['children'][0], $value ); } return $collected; case 'comparator': $left = $this->dispatch($node['children'][0], $value); $right = $this->dispatch($node['children'][1], $value); if ($node['value'] == '==') { return Utils::isEqual($left, $right); } elseif ($node['value'] == '!=') { return !Utils::isEqual($left, $right); } else { return self::relativeCmp($left, $right, $node['value']); } case 'condition': return Utils::isTruthy($this->dispatch($node['children'][0], $value)) ? $this->dispatch($node['children'][1], $value) : null; case 'function': $args = []; foreach ($node['children'] as $arg) { $args[] = $this->dispatch($arg, $value); } return $dispatcher($node['value'], $args); case 'slice': return is_string($value) \|\| Utils::isArray($value) ? Utils::slice( $value, $node['value'][0], $node['value'][1], $node['value'][2] ) : null; case 'expref': $apply = $node['children'][0]; return function ($value) use ($apply) { return $this->visit($apply, $value); }; default: throw new \RuntimeException("Unknown node type: {$node['type']}"); } } /* * @return bool */ private static function relativeCmp($left, $right, $cmp) { if (!(is_int($left) \|\| is_float($left)) \|\| !(is_int($right) \|\| is_float($right))) { return false; } switch ($cmp) { case '>': return $left > $right; case '>=': return $left >= $right; case '<': return $left < $right; case '<=': return $left <= $right; default: throw new \RuntimeException("Invalid comparison: $cmp"); } } } Back

Edit File : TreeInterpreter.php | Size : 7.64 KB

<?php
namespace JmesPath;

/**
 * Tree visitor used to evaluates JMESPath AST expressions.
 */
class TreeInterpreter
{
    /** @var callable */
    private $fnDispatcher;

/**
     * @param callable $fnDispatcher Function dispatching function that accepts
     *                               a function name argument and an array of
     *                               function arguments and returns the result.
     */
    public function __construct(callable $fnDispatcher = null)
    {
        $this->fnDispatcher = $fnDispatcher ?: FnDispatcher::getInstance();
    }

/**
     * Visits each node in a JMESPath AST and returns the evaluated result.
     *
     * @param array $node JMESPath AST node
     * @param mixed $data Data to evaluate
     *
     * @return mixed
     */
    public function visit(array $node, $data)
    {
        return $this->dispatch($node, $data);
    }

/**
     * Recursively traverses an AST using depth-first, pre-order traversal.
     * The evaluation logic for each node type is embedded into a large switch
     * statement to avoid the cost of "double dispatch".
     * @return mixed
     */
    private function dispatch(array $node, $value)
    {
        $dispatcher = $this->fnDispatcher;

switch ($node['type']) {

case 'field':
                if (is_array($value) || $value instanceof \ArrayAccess) {
                    return isset($value[$node['value']]) ? $value[$node['value']] : null;
                } elseif ($value instanceof \stdClass) {
                    return isset($value->{$node['value']}) ? $value->{$node['value']} : null;
                }
                return null;

case 'subexpression':
                return $this->dispatch(
                    $node['children'][1],
                    $this->dispatch($node['children'][0], $value)
                );

case 'index':
                if (!Utils::isArray($value)) {
                    return null;
                }
                $idx = $node['value'] >= 0
                    ? $node['value']
                    : $node['value'] + count($value);
                return isset($value[$idx]) ? $value[$idx] : null;

case 'projection':
                $left = $this->dispatch($node['children'][0], $value);
                switch ($node['from']) {
                    case 'object':
                        if (!Utils::isObject($left)) {
                            return null;
                        }
                        break;
                    case 'array':
                        if (!Utils::isArray($left)) {
                            return null;
                        }
                        break;
                    default:
                        if (!is_array($left) || !($left instanceof \stdClass)) {
                            return null;
                        }
                }

$collected = [];
                foreach ((array) $left as $val) {
                    $result = $this->dispatch($node['children'][1], $val);
                    if ($result !== null) {
                        $collected[] = $result;
                    }
                }

return $collected;

case 'flatten':
                static $skipElement = [];
                $value = $this->dispatch($node['children'][0], $value);

if (!Utils::isArray($value)) {
                    return null;
                }

$merged = [];
                foreach ($value as $values) {
                    // Only merge up arrays lists and not hashes
                    if (is_array($values) && isset($values[0])) {
                        $merged = array_merge($merged, $values);
                    } elseif ($values !== $skipElement) {
                        $merged[] = $values;
                    }
                }

return $merged;

case 'literal':
                return $node['value'];

case 'current':
                return $value;

case 'or':
                $result = $this->dispatch($node['children'][0], $value);
                return Utils::isTruthy($result)
                    ? $result
                    : $this->dispatch($node['children'][1], $value);

case 'and':
                $result = $this->dispatch($node['children'][0], $value);
                return Utils::isTruthy($result)
                    ? $this->dispatch($node['children'][1], $value)
                    : $result;

case 'not':
                return !Utils::isTruthy(
                    $this->dispatch($node['children'][0], $value)
                );

case 'pipe':
                return $this->dispatch(
                    $node['children'][1],
                    $this->dispatch($node['children'][0], $value)
                );

case 'multi_select_list':
                if ($value === null) {
                    return null;
                }

$collected = [];
                foreach ($node['children'] as $node) {
                    $collected[] = $this->dispatch($node, $value);
                }

return $collected;

case 'multi_select_hash':
                if ($value === null) {
                    return null;
                }

$collected = [];
                foreach ($node['children'] as $node) {
                    $collected[$node['value']] = $this->dispatch(
                        $node['children'][0],
                        $value
                    );
                }

return $collected;

case 'comparator':
                $left = $this->dispatch($node['children'][0], $value);
                $right = $this->dispatch($node['children'][1], $value);
                if ($node['value'] == '==') {
                    return Utils::isEqual($left, $right);
                } elseif ($node['value'] == '!=') {
                    return !Utils::isEqual($left, $right);
                } else {
                    return self::relativeCmp($left, $right, $node['value']);
                }

case 'condition':
                return Utils::isTruthy($this->dispatch($node['children'][0], $value))
                    ? $this->dispatch($node['children'][1], $value)
                    : null;

case 'function':
                $args = [];
                foreach ($node['children'] as $arg) {
                    $args[] = $this->dispatch($arg, $value);
                }
                return $dispatcher($node['value'], $args);

case 'slice':
                return is_string($value) || Utils::isArray($value)
                    ? Utils::slice(
                        $value,
                        $node['value'][0],
                        $node['value'][1],
                        $node['value'][2]
                    ) : null;

case 'expref':
                $apply = $node['children'][0];
                return function ($value) use ($apply) {
                    return $this->visit($apply, $value);
                };

default:
                throw new \RuntimeException("Unknown node type: {$node['type']}");
        }
    }

/**
     * @return bool
     */
    private static function relativeCmp($left, $right, $cmp)
    {
        if (!(is_int($left) || is_float($left)) || !(is_int($right) || is_float($right))) {
            return false;
        }

switch ($cmp) {
            case '>': return $left > $right;
            case '>=': return $left >= $right;
            case '<': return $left < $right;
            case '<=': return $left <= $right;
            default: throw new \RuntimeException("Invalid comparison: $cmp");
        }
    }
}

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