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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Cosray\Finder; |
| 6 | |
| 7 | use Closure; |
| 8 | use Cosray\Context; |
| 9 | use Cosray\Exception\ParserException; |
| 10 | |
| 11 | final class OrderCompiler |
| 12 | { |
| 13 | use CompilesField; |
| 14 | |
| 15 | /** @var array<string, string> */ |
| 16 | private array $params = []; |
| 17 | |
| 18 | /** @param array<string, string|Closure(): string> $builtins */ |
| 19 | public function __construct( |
| 20 | private readonly array $builtins = [], |
| 21 | private readonly ?Context $context = null, |
| 22 | ) {} |
| 23 | |
| 24 | public function compile(string|Order ...$statements): string |
| 25 | { |
| 26 | $expressions = []; |
| 27 | |
| 28 | foreach ($statements as $statement) { |
| 29 | if ($statement instanceof Order) { |
| 30 | $expressions[] = $this->structured($statement); |
| 31 | continue; |
| 32 | } |
| 33 | |
| 34 | if (trim($statement) === '') { |
| 35 | throw new ParserException('Empty order by clause'); |
| 36 | } |
| 37 | |
| 38 | foreach ($this->parse($statement) as $field) { |
| 39 | $fieldName = $field['field']; |
| 40 | $expression = $this->builtin($fieldName) |
| 41 | ?? $this->compileField($fieldName, 'n.content', localeIds: $this->localeIds()); |
| 42 | $expressions[] = $expression . ' ' . $field['direction']; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | if ($expressions === []) { |
| 47 | throw new ParserException('Empty order by clause'); |
| 48 | } |
| 49 | |
| 50 | return "\n " . implode(",\n ", $expressions); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Bound values the compiled order refers to. |
| 55 | * |
| 56 | * @return array<string, string> |
| 57 | */ |
| 58 | public function params(): array |
| 59 | { |
| 60 | return $this->params; |
| 61 | } |
| 62 | |
| 63 | private function structured(Order $order): string |
| 64 | { |
| 65 | $field = $order->field; |
| 66 | |
| 67 | if ($field->type === 'position') { |
| 68 | return $this->position($field->collection, strtoupper($order->direction)); |
| 69 | } |
| 70 | |
| 71 | $expression = $this->builtin($field->name); |
| 72 | |
| 73 | if ($expression !== null && $field->type !== 'text') { |
| 74 | throw new ParserException("Built-in sort field '{$field->name}' already has a native type"); |
| 75 | } |
| 76 | |
| 77 | if ($expression === null) { |
| 78 | $expression = $this->scalar($field->name); |
| 79 | |
| 80 | if ($field->type !== 'text') { |
| 81 | // PostgreSQL accepts relative dates and special numeric values. Stored |
| 82 | // CMS values must be absolute, finite scalars; corrupt data must fail. |
| 83 | $pattern = match ($field->type) { |
| 84 | 'numeric' => '^[+-]?([0-9]+([.][0-9]*)?|[.][0-9]+)([eE][+-]?[0-9]+)?$', |
| 85 | 'date' => '^[0-9]{4}-[0-9]{2}-[0-9]{2}$', |
| 86 | 'timestamptz' |
| 87 | => '^[0-9]{4}-[0-9]{2}-[0-9]{2}T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](Z|[+-]([01][0-9]|2[0-3]):[0-5][0-9])$', |
| 88 | default => throw new ParserException("Unknown sort type '{$field->type}'"), |
| 89 | }; |
| 90 | $expression = |
| 91 | "CAST(CASE WHEN {$expression} ~ '{$pattern}' THEN {$expression} " |
| 92 | . "ELSE 'Invalid {$field->type} sort value for {$field->name}: ' || {$expression} END AS {$field->type})"; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | return $expression . ' ' . strtoupper($order->direction) . ' NULLS LAST'; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * A correlated lookup rather than a join, so the finder's query stays |
| 101 | * as it is. The title and uid follow in the same direction: unpositioned |
| 102 | * nodes keep the order they had before anyone arranged them. |
| 103 | */ |
| 104 | private function position(?string $collection, string $direction): string |
| 105 | { |
| 106 | if ($collection === null) { |
| 107 | $scope = 'pos.parent = n.parent'; |
| 108 | } else { |
| 109 | $param = 'order_collection_' . count($this->params); |
| 110 | $this->params[$param] = $collection; |
| 111 | $scope = 'pos.collection = :' . $param; |
| 112 | } |
| 113 | |
| 114 | $lookup = |
| 115 | '(SELECT pos.position FROM /*:cms.prefix:*/node_positions pos WHERE ' |
| 116 | . $scope |
| 117 | . ' AND pos.node = n.node)'; |
| 118 | $title = $this->builtin('title'); |
| 119 | $terms = [$lookup . ' ' . $direction . ' NULLS LAST']; |
| 120 | |
| 121 | if ($title !== null) { |
| 122 | $terms[] = $title . ' ' . $direction; |
| 123 | } |
| 124 | |
| 125 | $terms[] = 'n.uid ' . $direction; |
| 126 | |
| 127 | return implode(', ', $terms); |
| 128 | } |
| 129 | |
| 130 | private function scalar(string $field): string |
| 131 | { |
| 132 | $fields = str_contains($field, '.') |
| 133 | ? [$field] |
| 134 | : array_map( |
| 135 | static fn(string $locale): string => $field . '.' . $locale, |
| 136 | $this->normalizeLocaleIds($this->localeIds()), |
| 137 | ); |
| 138 | $values = []; |
| 139 | |
| 140 | foreach ($fields as $path) { |
| 141 | // JSON_VALUE rejects arrays/objects instead of silently sorting their |
| 142 | // serialized representation. SQL/JSON nulls allow locale fallback. |
| 143 | $json = $this->compileField($path, 'n.content', asIs: true); |
| 144 | $values[] = "NULLIF(BTRIM(JSON_VALUE({$json}, '$' RETURNING text ERROR ON ERROR), E' \\t\\n\\r\\013'), '')"; |
| 145 | } |
| 146 | |
| 147 | return 'COALESCE(' . implode(', ', $values) . ')'; |
| 148 | } |
| 149 | |
| 150 | private function builtin(string $field): ?string |
| 151 | { |
| 152 | $value = $this->builtins[$field] ?? null; |
| 153 | |
| 154 | return $value instanceof Closure ? $value() : $value; |
| 155 | } |
| 156 | |
| 157 | /** @return list<string> */ |
| 158 | private function localeIds(): array |
| 159 | { |
| 160 | if (!$this->context) { |
| 161 | return ['zxx']; |
| 162 | } |
| 163 | |
| 164 | $locale = $this->context->locale(); |
| 165 | |
| 166 | return [$locale->id, ...$locale->fallbacks()]; |
| 167 | } |
| 168 | |
| 169 | /** @return list<array{field: string, direction: string}> */ |
| 170 | private function parse(string $statement): array |
| 171 | { |
| 172 | $fields = explode(',', $statement); |
| 173 | $pattern = '/^\s*([a-zA-Z][a-zA-Z0-9._]*)\s*(asc|desc)?\s*$/i'; |
| 174 | $result = []; |
| 175 | |
| 176 | foreach ($fields as $field) { |
| 177 | if (preg_match($pattern, trim($field), $matches)) { |
| 178 | $result[] = [ |
| 179 | 'field' => $matches[1], |
| 180 | 'direction' => strtoupper($matches[2] ?? null ?: 'ASC'), |
| 181 | ]; |
| 182 | } else { |
| 183 | throw new ParserException('Invalid order by clause'); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | return $result; |
| 188 | } |
| 189 | } |