Search term negation

app/Search/Options/ExactSearchOption.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace BookStack\Search\Options;
+
+class ExactSearchOption extends SearchOption
+{
+    public function toString(): string
+    {
+        $escaped = str_replace('\\', '\\\\', $this->value);
+        $escaped = str_replace('"', '\"', $escaped);
+        return ($this->negated ? '-' : '') . '"' . $escaped . '"';
+    }
+}

app/Search/Options/FilterSearchOption.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace BookStack\Search\Options;
+
+class FilterSearchOption extends SearchOption
+{
+    protected string $name;
+
+    public function __construct(
+        string $value,
+        string $name,
+        bool $negated = false,
+    ) {
+        parent::__construct($value, $negated);
+        $this->name = $name;
+    }
+
+    public function toString(): string
+    {
+        $valueText = ($this->value ? ':' . $this->value : '');
+        $filterBrace = '{' . $this->name .  $valueText . '}';
+        return ($this->negated ? '-' : '') . $filterBrace;
+    }
+
+    public function getKey(): string
+    {
+        return $this->name;
+    }
+
+    public static function fromContentString(string $value, bool $negated = false): self
+    {
+        $explodedFilter = explode(':', $value, 2);
+        $filterValue = (count($explodedFilter) > 1) ? $explodedFilter[1] : '';
+        $filterName = $explodedFilter[0];
+        return new self($filterValue, $filterName, $negated);
+    }
+}

app/Search/Options/SearchOption.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace BookStack\Search\Options;
+
+abstract class SearchOption
+{
+    public function __construct(
+        public string $value,
+        public bool $negated = false,
+    ) {
+    }
+
+    /**
+     * Get the key used for this option when used in a map.
+     * Null indicates to use the index of the containing array.
+     */
+    public function getKey(): string|null
+    {
+        return null;
+    }
+
+    /**
+     * Get the search string representation for this search option.
+     */
+    abstract public function toString(): string;
+}

app/Search/Options/TagSearchOption.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace BookStack\Search\Options;
+
+class TagSearchOption extends SearchOption
+{
+    /**
+     * Acceptable operators to be used within a tag search option.
+     *
+     * @var string[]
+     */
+    protected array $queryOperators = ['<=', '>=', '=', '<', '>', 'like', '!='];
+
+    public function toString(): string
+    {
+        return ($this->negated ? '-' : '') . "[{$this->value}]";
+    }
+
+    /**
+     * @return array{name: string, operator: string, value: string}
+     */
+    public function getParts(): array
+    {
+        $operatorRegex = implode('|', array_map(fn($op) => preg_quote($op), $this->queryOperators));
+        preg_match('/^(.*?)((' . $operatorRegex . ')(.*?))?$/', $this->value, $tagSplit);
+
+        $extractedOperator = count($tagSplit) > 2 ? $tagSplit[3] : '';
+        $tagOperator = in_array($extractedOperator, $this->queryOperators) ? $extractedOperator : '=';
+        $tagValue = count($tagSplit) > 3 ? $tagSplit[4] : '';
+
+        return [
+            'name' => $tagSplit[1],
+            'operator' => $tagOperator,
+            'value' => $tagValue,
+        ];
+    }
+}

app/Search/Options/TermSearchOption.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace BookStack\Search\Options;
+
+class TermSearchOption extends SearchOption
+{
+    public function toString(): string
+    {
+        return $this->value;
+    }
+}

app/Search/SearchOptionSet.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace BookStack\Search;
+
+use BookStack\Search\Options\SearchOption;
+
+/**
+ * @template T of SearchOption
+ */
+class SearchOptionSet
+{
+    /**
+     * @var T[]
+     */
+    protected array $options = [];
+
+    public function __construct(array $options = [])
+    {
+        $this->options = $options;
+    }
+
+    public function toValueArray(): array
+    {
+        return array_map(fn(SearchOption $option) => $option->value, $this->options);
+    }
+
+    public function toValueMap(): array
+    {
+        $map = [];
+        foreach ($this->options as $index => $option) {
+            $key = $option->getKey() ?? $index;
+            $map[$key] = $option->value;
+        }
+        return $map;
+    }
+
+    public function merge(SearchOptionSet $set): self
+    {
+        return new self(array_merge($this->options, $set->options));
+    }
+
+    public function filterEmpty(): self
+    {
+        $filteredOptions = array_values(array_filter($this->options, fn (SearchOption $option) => !empty($option->value)));
+        return new self($filteredOptions);
+    }
+
+    /**
+     * @param class-string<SearchOption> $class
+     */
+    public static function fromValueArray(array $values, string $class): self
+    {
+        $options = array_map(fn($val) => new $class($val), $values);
+        return new self($options);
+    }
+
+    /**
+     * @return T[]
+     */
+    public function all(): array
+    {
+        return $this->options;
+    }
+
+    /**
+     * @return self<T>
+     */
+    public function negated(): self
+    {
+        $values = array_values(array_filter($this->options, fn (SearchOption $option) => $option->negated));
+        return new self($values);
+    }
+
+    /**
+     * @return self<T>
+     */
+    public function nonNegated(): self
+    {
+        $values = array_values(array_filter($this->options, fn (SearchOption $option) => !$option->negated));
+        return new self($values);
+    }
+}