framework/console/controllers/MigrateController.php
protected function parseFields()
    {
        $fields = [];
        $foreignKeys = [];

        foreach ($this->fields as $index => $field) {
            $chunks = preg_split('/\s?:\s?/', $field, null);
            $property = array_shift($chunks);

            foreach ($chunks as $i => &$chunk) {
                if (strncmp($chunk, 'foreignKey', 10) === 0) {
                    preg_match('/foreignKey\((\w*)\s?(\w*)\)/', $chunk, $matches);
                    $foreignKeys[$property] = [
                        'table' => isset($matches[1])
                            ? $matches[1]
                            : preg_replace('/_id$/', '', $property),
                        'column' => !empty($matches[2])
                            ? $matches[2]
                            : null,
                    ];

                    unset($chunks[$i]);
                    continue;
                }

                if (!preg_match('/^(.+?)\(([^(]+)\)$/', $chunk)) {
                    $chunk .= '()';
                }
            }
            $fields[] = [
                'property' => $property,
                'decorators' => implode('->', $chunks),
            ];
        }

        return [
            'fields' => $fields,
            'foreignKeys' => $foreignKeys,
        ];
    }
protected function parseFields()
    {
        $fields = [];
        $foreignKeys = [];

        foreach ($this->fields as $index => $field) {
            $chunks = preg_split('/\s?:\s?/', $field, null);
            $property = array_shift($chunks);

            foreach ($chunks as $i => &$chunk) {
                if (strncmp($chunk, 'foreignKey', 10) === 0) {
                    preg_match('/foreignKey\((\w*)\s?(\w*)\)/', $chunk, $matches);
                    $foreignKeys[$property] = [
                        'table' => isset($matches[1])
                            ? $matches[1]
                            : preg_replace('/_id$/', '', $property),
                        'column' => !empty($matches[2])
                            ? $matches[2]
                            : null,
                    ];

                    unset($chunks[$i]);
                    continue;
                }

                if (!preg_match('/^(.+?)\(([^(]+)\)$/', $chunk)) {
                    $chunk .= '()';
                }
            }
            $fields[] = [
                'property' => $property,
                'decorators' => implode('->', $chunks),
            ];
        }

        return [
            'fields' => $fields,
            'foreignKeys' => $foreignKeys,
        ];
    }
Parse the command line migration fields.
@return array parse result with following fields:

- fields: array, parsed fields
- foreignKeys: array, detected foreign keys

@since 2.0.7