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1<?php
2
3namespace MediaWiki\Extension\AbuseFilter\Variables;
4
5use MediaWiki\Extension\AbuseFilter\Parser\AFPData;
6
7/**
8 * Mutable value object that holds a list of variables
9 */
10class VariableHolder {
11    /**
12     * @var (AFPData|LazyLoadedVariable)[]
13     */
14    private $mVars = [];
15
16    /**
17     * Utility function to translate an array with shape [ varname => value ] into a self instance
18     *
19     * @param array $vars
20     * @return self
21     */
22    public static function newFromArray( array $vars ): self {
23        $ret = new self();
24        foreach ( $vars as $var => $value ) {
25            $ret->setVar( $var, $value );
26        }
27        return $ret;
28    }
29
30    /**
31     * @param string $variable
32     * @param mixed $datum
33     */
34    public function setVar( string $variable, $datum ): void {
35        $variable = strtolower( $variable );
36        if ( !( $datum instanceof AFPData || $datum instanceof LazyLoadedVariable ) ) {
37            $datum = AFPData::newFromPHPVar( $datum );
38        }
39
40        $this->mVars[$variable] = $datum;
41    }
42
43    /**
44     * Get all variables stored in this object
45     *
46     * @return (AFPData|LazyLoadedVariable)[]
47     */
48    public function getVars(): array {
49        return $this->mVars;
50    }
51
52    /**
53     * @param string $variable
54     * @param string $method
55     * @param array $parameters
56     */
57    public function setLazyLoadVar( string $variable, string $method, array $parameters ): void {
58        $placeholder = new LazyLoadedVariable( $method, $parameters );
59        $this->setVar( $variable, $placeholder );
60    }
61
62    /**
63     * Get a variable from the current object, or throw if not set
64     *
65     * @param string $varName The variable name
66     * @return AFPData|LazyLoadedVariable
67     */
68    public function getVarThrow( string $varName ) {
69        $varName = strtolower( $varName );
70        if ( !$this->varIsSet( $varName ) ) {
71            throw new UnsetVariableException( $varName );
72        }
73        return $this->mVars[$varName];
74    }
75
76    /**
77     * A stronger version of self::getVarThrow that also asserts that the variable was computed
78     * @param string $varName
79     * @return AFPData
80     * @codeCoverageIgnore
81     */
82    public function getComputedVariable( string $varName ): AFPData {
83        return $this->getVarThrow( $varName );
84    }
85
86    /**
87     * Merge any number of holders given as arguments into this holder.
88     */
89    public function addHolders( self ...$holders ): void {
90        foreach ( $holders as $addHolder ) {
91            $this->mVars = array_merge( $this->mVars, $addHolder->mVars );
92        }
93    }
94
95    public function varIsSet( string $var ): bool {
96        return array_key_exists( $var, $this->mVars );
97    }
98
99    public function removeVar( string $varName ): void {
100        unset( $this->mVars[$varName] );
101    }
102}