ConverterRule.php

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<?php
use MediaWiki\Logger\LoggerFactory;
 
class ConverterRule {
    public $mText;
    public $mConverter;
    public $mRuleDisplay = '';
    public $mRuleTitle = false;
    public $mRules = '';
    public $mRulesAction = 'none';
    public $mFlags = [];
    public $mVariantFlags = [];
    public $mConvTable = [];
    public $mBidtable = [];
    public $mUnidtable = [];
 
    public function __construct( $text, LanguageConverter $converter ) {
        $this->mText = $text;
        $this->mConverter = $converter;
    }
 
    public function getTextInBidtable( $variants ) {
        $variants = (array)$variants;
        if ( !$variants ) {
            return false;
        }
        foreach ( $variants as $variant ) {
            if ( isset( $this->mBidtable[$variant] ) ) {
                return $this->mBidtable[$variant];
            }
        }
        return false;
    }
 
    private function parseFlags() {
        $text = $this->mText;
        $flags = [];
        $variantFlags = [];
 
        $sepPos = strpos( $text, '|' );
        if ( $sepPos !== false ) {
            $validFlags = $this->mConverter->getFlags();
            $f = StringUtils::explode( ';', substr( $text, 0, $sepPos ) );
            foreach ( $f as $ff ) {
                $ff = trim( $ff );
                if ( isset( $validFlags[$ff] ) ) {
                    $flags[$validFlags[$ff]] = true;
                }
            }
            $text = strval( substr( $text, $sepPos + 1 ) );
        }
 
        if ( !$flags ) {
            $flags['S'] = true;
        } elseif ( isset( $flags['R'] ) ) {
            // remove other flags
            $flags = [ 'R' => true ];
        } elseif ( isset( $flags['N'] ) ) {
            // remove other flags
            $flags = [ 'N' => true ];
        } elseif ( isset( $flags['-'] ) ) {
            // remove other flags
            $flags = [ '-' => true ];
        } elseif ( count( $flags ) === 1 && isset( $flags['T'] ) ) {
            $flags['H'] = true;
        } elseif ( isset( $flags['H'] ) ) {
            // replace A flag, and remove other flags except T
            $temp = [ '+' => true, 'H' => true ];
            if ( isset( $flags['T'] ) ) {
                $temp['T'] = true;
            }
            if ( isset( $flags['D'] ) ) {
                $temp['D'] = true;
            }
            $flags = $temp;
        } else {
            if ( isset( $flags['A'] ) ) {
                $flags['+'] = true;
                $flags['S'] = true;
            }
            if ( isset( $flags['D'] ) ) {
                unset( $flags['S'] );
            }
            // try to find flags like "zh-hans", "zh-hant"
            // allow syntaxes like "-{zh-hans;zh-hant|XXXX}-"
            $variantFlags = array_intersect( array_keys( $flags ), $this->mConverter->getVariants() );
            if ( $variantFlags ) {
                $variantFlags = array_fill_keys( $variantFlags, true );
                $flags = [];
            }
        }
        $this->mVariantFlags = $variantFlags;
        $this->mRules = $text;
        $this->mFlags = $flags;
    }
 
    private function parseRules() {
        $rules = $this->mRules;
        $bidtable = [];
        $unidtable = [];
        $varsep_pattern = $this->mConverter->getVarSeparatorPattern();
 
        // Split text according to $varsep_pattern, but ignore semicolons from HTML entities
        $rules = preg_replace( '/(&[#a-zA-Z0-9]+);/', "$1\x01", $rules );
        $choice = preg_split( $varsep_pattern, $rules );
        // @phan-suppress-next-line PhanTypeComparisonFromArray
        if ( $choice === false ) {
            $error = preg_last_error();
            $errorText = preg_last_error_msg();
            LoggerFactory::getInstance( 'parser' )->warning(
                'ConverterRule preg_split error: {code} {errorText}',
                [
                    'code' => $error,
                    'errorText' => $errorText
                ]
            );
            $choice = [];
        }
        $choice = str_replace( "\x01", ';', $choice );
 
        foreach ( $choice as $c ) {
            $v = explode( ':', $c, 2 );
            if ( count( $v ) !== 2 ) {
                // syntax error, skip
                continue;
            }
            $to = trim( $v[1] );
            $v = trim( $v[0] );
            $u = explode( '=>', $v, 2 );
            $vv = $this->mConverter->validateVariant( $v );
            // if $to is empty (which is also used as $from in bidtable),
            // strtr() could return a wrong result.
            if ( count( $u ) === 1 && $to !== '' && $vv ) {
                $bidtable[$vv] = $to;
            } elseif ( count( $u ) === 2 ) {
                $from = trim( $u[0] );
                $v = trim( $u[1] );
                $vv = $this->mConverter->validateVariant( $v );
                // if $from is empty, strtr() could return a wrong result.
                if ( array_key_exists( $vv, $unidtable )
                    && !is_array( $unidtable[$vv] )
                    && $from !== ''
                    && $vv ) {
                    $unidtable[$vv] = [ $from => $to ];
                } elseif ( $from !== '' && $vv ) {
                    $unidtable[$vv][$from] = $to;
                }
            }
            // syntax error, pass
            if ( !isset( $this->mConverter->getVariantNames()[$vv] ) ) {
                $bidtable = [];
                $unidtable = [];
                break;
            }
        }
        $this->mBidtable = $bidtable;
        $this->mUnidtable = $unidtable;
    }
 
    private function getRulesDesc() {
        $codesep = $this->mConverter->getDescCodeSeparator();
        $varsep = $this->mConverter->getDescVarSeparator();
        $text = '';
        foreach ( $this->mBidtable as $k => $v ) {
            $text .= $this->mConverter->getVariantNames()[$k] . "$codesep$v$varsep";
        }
        foreach ( $this->mUnidtable as $k => $a ) {
            foreach ( $a as $from => $to ) {
                $text .= $from . '⇒' . $this->mConverter->getVariantNames()[$k] .
                    "$codesep$to$varsep";
            }
        }
        return $text;
    }
 
    private function getRuleConvertedStr( $variant ) {
        $bidtable = $this->mBidtable;
        $unidtable = $this->mUnidtable;
 
        if ( count( $bidtable ) + count( $unidtable ) === 0 ) {
            return $this->mRules;
        }
 
        // display current variant in bidirectional array
        $disp = $this->getTextInBidtable( $variant );
        // or display current variant in fallbacks
        if ( $disp === false ) {
            $disp = $this->getTextInBidtable(
                $this->mConverter->getVariantFallbacks( $variant ) );
        }
        // or display current variant in unidirectional array
        if ( $disp === false && array_key_exists( $variant, $unidtable ) ) {
            $disp = array_values( $unidtable[$variant] )[0];
        }
        // or display first text under disable manual convert
        if ( $disp === false && $this->mConverter->getManualLevel()[$variant] === 'disable' ) {
            if ( count( $bidtable ) > 0 ) {
                $disp = array_values( $bidtable )[0];
            } else {
                $disp = array_values( array_values( $unidtable )[0] )[0];
            }
        }
 
        return $disp;
    }
 
    private function getRuleConvertedTitle( $variant ) {
        if ( $variant === $this->mConverter->getMainCode() ) {
            // If a string targeting exactly this variant is set,
            // use it. Otherwise, just return false, so the real
            // page name can be shown (and because variant === main,
            // there'll be no further automatic conversion).
            $disp = $this->getTextInBidtable( $variant );
            if ( $disp ) {
                return $disp;
            }
            if ( array_key_exists( $variant, $this->mUnidtable ) ) {
                $disp = array_values( $this->mUnidtable[$variant] )[0];
            }
            // Assigned above or still false.
            return $disp;
        }
 
        return $this->getRuleConvertedStr( $variant );
    }
 
    private function generateConvTable() {
        // Special case optimisation
        if ( !$this->mBidtable && !$this->mUnidtable ) {
            $this->mConvTable = [];
            return;
        }
 
        $bidtable = $this->mBidtable;
        $unidtable = $this->mUnidtable;
        $manLevel = $this->mConverter->getManualLevel();
 
        $vmarked = [];
        foreach ( $this->mConverter->getVariants() as $v ) {
            /* for bidirectional array
                fill in the missing variants, if any,
                with fallbacks */
            if ( !isset( $bidtable[$v] ) ) {
                $variantFallbacks =
                    $this->mConverter->getVariantFallbacks( $v );
                $vf = $this->getTextInBidtable( $variantFallbacks );
                if ( $vf ) {
                    $bidtable[$v] = $vf;
                }
            }
 
            if ( isset( $bidtable[$v] ) ) {
                foreach ( $vmarked as $vo ) {
                    // use syntax: -{A|zh:WordZh;zh-tw:WordTw}-
                    // or -{H|zh:WordZh;zh-tw:WordTw}-
                    // or -{-|zh:WordZh;zh-tw:WordTw}-
                    // to introduce a custom mapping between
                    // words WordZh and WordTw in the whole text
                    if ( $manLevel[$v] === 'bidirectional' ) {
                        $this->mConvTable[$v][$bidtable[$vo]] = $bidtable[$v];
                    }
                    if ( $manLevel[$vo] === 'bidirectional' ) {
                        $this->mConvTable[$vo][$bidtable[$v]] = $bidtable[$vo];
                    }
                }
                $vmarked[] = $v;
            }
            /* for unidirectional array fill to convert tables */
            if ( ( $manLevel[$v] === 'bidirectional' || $manLevel[$v] === 'unidirectional' )
                && isset( $unidtable[$v] )
            ) {
                if ( isset( $this->mConvTable[$v] ) ) {
                    $this->mConvTable[$v] = $unidtable[$v] + $this->mConvTable[$v];
                } else {
                    $this->mConvTable[$v] = $unidtable[$v];
                }
            }
        }
    }
 
    public function parse( $variant = null ) {
        if ( !$variant ) {
            $variant = $this->mConverter->getPreferredVariant();
        }
 
        $this->parseFlags();
        $flags = $this->mFlags;
 
        // convert to specified variant
        // syntax: -{zh-hans;zh-hant[;...]|<text to convert>}-
        if ( $this->mVariantFlags ) {
            // check if current variant in flags
            if ( isset( $this->mVariantFlags[$variant] ) ) {
                // then convert <text to convert> to current language
                $this->mRules = $this->mConverter->autoConvert( $this->mRules,
                    $variant );
            } else {
                // if the current variant is not in flags,
                // then we check its fallback variants.
                $variantFallbacks =
                    $this->mConverter->getVariantFallbacks( $variant );
                if ( is_array( $variantFallbacks ) ) {
                    foreach ( $variantFallbacks as $variantFallback ) {
                        // if current variant's fallback exist in flags
                        if ( isset( $this->mVariantFlags[$variantFallback] ) ) {
                            // then convert <text to convert> to fallback language
                            $this->mRules =
                                $this->mConverter->autoConvert( $this->mRules,
                                    $variantFallback );
                            break;
                        }
                    }
                }
            }
            $this->mFlags = $flags = [ 'R' => true ];
        }
 
        if ( !isset( $flags['R'] ) && !isset( $flags['N'] ) ) {
            // decode => HTML entities modified by Sanitizer::internalRemoveHtmlTags
            $this->mRules = str_replace( '=&gt;', '=>', $this->mRules );
            $this->parseRules();
        }
        $rules = $this->mRules;
 
        if ( !$this->mBidtable && !$this->mUnidtable ) {
            if ( isset( $flags['+'] ) || isset( $flags['-'] ) ) {
                // fill all variants if the text in -{A/H/-|text}- is non-empty but without rules
                if ( $rules !== '' ) {
                    foreach ( $this->mConverter->getVariants() as $v ) {
                        $this->mBidtable[$v] = $rules;
                    }
                }
            } elseif ( !isset( $flags['N'] ) && !isset( $flags['T'] ) ) {
                $this->mFlags = $flags = [ 'R' => true ];
            }
        }
 
        $this->mRuleDisplay = false;
        foreach ( $flags as $flag => $unused ) {
            switch ( $flag ) {
                case 'R':
                    // if we don't do content convert, still strip the -{}- tags
                    $this->mRuleDisplay = $rules;
                    break;
                case 'N':
                    // process N flag: output current variant name
                    $ruleVar = trim( $rules );
                    $this->mRuleDisplay = $this->mConverter->getVariantNames()[$ruleVar] ?? '';
                    break;
                case 'D':
                    // process D flag: output rules description
                    $this->mRuleDisplay = $this->getRulesDesc();
                    break;
                case 'H':
                    // process H,- flag or T only: output nothing
                    $this->mRuleDisplay = '';
                    break;
                case '-':
                    $this->mRulesAction = 'remove';
                    $this->mRuleDisplay = '';
                    break;
                case '+':
                    $this->mRulesAction = 'add';
                    $this->mRuleDisplay = '';
                    break;
                case 'S':
                    $this->mRuleDisplay = $this->getRuleConvertedStr( $variant );
                    break;
                case 'T':
                    $this->mRuleTitle = $this->getRuleConvertedTitle( $variant );
                    $this->mRuleDisplay = '';
                    break;
                default:
                    // ignore unknown flags (but see error-case below)
            }
        }
        if ( $this->mRuleDisplay === false ) {
            $this->mRuleDisplay = '<span class="error">'
                . wfMessage( 'converter-manual-rule-error' )->inContentLanguage()->escaped()
                . '</span>';
        }
 
        $this->generateConvTable();
    }
 
    public function hasRules() {
        return $this->mRules !== '';
    }
 
    public function getDisplay() {
        return $this->mRuleDisplay;
    }
 
    public function getTitle() {
        return $this->mRuleTitle;
    }
 
    public function getRulesAction() {
        return $this->mRulesAction;
    }
 
    public function getConvTable() {
        return $this->mConvTable;
    }
 
    public function getRules() {
        return $this->mRules;
    }
 
    public function getFlags() {
        return $this->mFlags;
    }
}