113 lines
4.4 KiB
PHP
113 lines
4.4 KiB
PHP
<?php
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namespace App\Services;
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use Illuminate\Support\Str;
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/** Text matching shared by the database and the built-in page catalogue. */
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final class SearchTerms
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{
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/** @return list<string> */
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public function tokens(string $query): array
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{
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$normalized = mb_strtolower(Str::ascii($query));
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$tokens = array_values(array_filter(array_unique(array_map(
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fn ($word) => trim($word, ".,;:!?\"'()[]{}"),
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preg_split('/\s+/u', trim($normalized), -1, PREG_SPLIT_NO_EMPTY) ?: []
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)), fn ($word) => $word !== ''));
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if (count($tokens) > 1) {
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$meaningful = array_values(array_diff($tokens, ['a', 'as', 'o', 'os', 'de', 'do', 'da', 'dos', 'das', 'em', 'no', 'na', 'nos', 'nas', 'para', 'por', 'e', 'como', 'qual', 'quais', 'um', 'uma']));
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return $meaningful === [] ? $tokens : $meaningful;
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}
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return $tokens;
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}
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/** Known Portuguese spelling and number variants; do not infer semantic equivalence. */
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public function variants(string $token): array
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{
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foreach ([['sector', 'sectores', 'setor', 'setores'], ['projecto', 'projectos', 'projeto', 'projetos'],
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['investir', 'investimento', 'investimentos'], ['investidor', 'investidores'], ['oportunidade', 'oportunidades'], ['documento', 'documentos'],
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['empresa', 'empresas'], ['parceria', 'parcerias'], ['zona', 'zonas'], ['formulario', 'formularios'],
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['provincia', 'provincias'], ['corredor', 'corredores'], ['cluster', 'clusters'], ['imposto', 'impostos'], ['licenca', 'licencas']] as $group) {
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if (in_array($token, $group, true)) {
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return $group;
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}
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}
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return [$token];
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}
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public function pattern(string $token): string
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{
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return '%'.str_replace(['!', '%', '_'], ['!!', '!%', '!_'], $token).'%';
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}
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/** Columns are trusted application constants, never user input. */
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public function orFields($query, array $columns, string $token): void
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{
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foreach ($columns as $column) {
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foreach ($this->variants($token) as $variant) {
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$query->orWhereRaw($this->normalizedColumn($column)." LIKE ? ESCAPE '!'", [$this->pattern($variant)]);
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}
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}
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}
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public function constrain($query, array $columns, array $tokens): void
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{
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foreach ($tokens as $token) {
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$query->where(fn ($match) => $this->orFields($match, $columns, $token));
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}
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}
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public function matches(string $text, array $tokens): bool
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{
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$text = mb_strtolower(Str::ascii($text));
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foreach ($tokens as $token) {
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if (! array_filter($this->variants($token), fn ($variant) => str_contains($text, $variant))) {
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return false;
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}
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}
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return true;
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}
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private function normalizedColumn(string $column): string
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{
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return "translate(lower(coalesce({$column}::text, '')), 'áàâãäéèêëíìîïóòôõöúùûüçñ', 'aaaaaeeeeiiiiooooouuuucn')";
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}
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public function score(string $title, string $phrase, array $tokens): int
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{
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$title = mb_strtolower(Str::ascii($title));
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$phrase = mb_strtolower(Str::ascii(trim($phrase)));
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$score = $title === $phrase ? 1000 : (str_contains($title, $phrase) ? 400 : 0);
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foreach ($tokens as $token) {
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if ($this->matches($title, [$token])) {
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$score += 20;
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}
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}
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return $score;
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}
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/** The same title score used for in-memory pages, with bound search terms. */
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public function orderByRelevance($query, string $titleColumn, string $phrase, array $tokens, string $tieColumn): void
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{
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$column = $this->normalizedColumn($titleColumn);
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$phrase = mb_strtolower(Str::ascii(trim($phrase)));
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$sql = "CASE WHEN {$column} = ? THEN 1000 WHEN {$column} LIKE ? ESCAPE '!' THEN 400 ELSE 0 END";
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$bindings = [$phrase, $this->pattern($phrase)];
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foreach ($tokens as $token) {
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$conditions = [];
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foreach ($this->variants($token) as $variant) {
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$conditions[] = "{$column} LIKE ? ESCAPE '!'";
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$bindings[] = $this->pattern($variant);
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}
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$sql .= ' + CASE WHEN ('.implode(' OR ', $conditions).') THEN 20 ELSE 0 END';
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}
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$query->orderByRaw('('.$sql.') DESC', $bindings)->orderBy($titleColumn)->orderBy($tieColumn);
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}
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}
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