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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| <?php | ||
| // searchoperatorset.php -- HotCRP helper class for search operators | ||
| // Copyright (c) 2006-2024 Eddie Kohler; see LICENSE. | ||
|
|
||
| class SearchOperatorSet { | ||
| /** @var array<string,SearchOperator> */ | ||
| private $a = []; | ||
| /** @var ?string */ | ||
| private $regex; | ||
|
|
||
| /** @var ?SearchOperatorSet */ | ||
| static private $psops = null; | ||
|
|
||
|
|
||
| /** @param string $name | ||
| * @param SearchOperator $op */ | ||
| function define($name, $op) { | ||
| // XXX no backslashes allowed | ||
| // XXX $name should be ctype_punct or contain no ctype_punct | ||
| $this->a[$name] = $op; | ||
| $this->regex = null; | ||
| } | ||
|
|
||
| /** @param string $name | ||
| * @return ?SearchOperator */ | ||
| function lookup($name) { | ||
| $op = $this->a[$name] ?? null; | ||
| if ($op === null | ||
| && ($colon = strpos($name, ":")) !== false | ||
| && ($xop = $this->a[substr($name, 0, $colon)]) !== null | ||
| && ($xop->flags & SearchOperator::F_ALLOW_SUBTYPE) !== 0) { | ||
| $op = $xop->make_subtype(substr($name, $colon + 1)); | ||
| $this->a[$name] = $op; | ||
| } | ||
| return $op; | ||
| } | ||
|
|
||
| /** @return string */ | ||
| function regex() { | ||
| if ($this->regex !== null) { | ||
| return $this->regex; | ||
| } | ||
| $ch = ""; | ||
| $br = $alnum = []; | ||
| foreach ($this->a as $name => $op) { | ||
| // XXX need more careful handling of longest-match | ||
| if (($op->flags & (SearchOperator::F_SUBTYPE | SearchOperator::F_UNNAMED)) !== 0) { | ||
| continue; | ||
| } | ||
| if (ctype_punct($name)) { | ||
| assert(($op->flags & SearchOperator::F_ALLOW_SUBTYPE) === 0); | ||
| if (strlen($name) === 1) { | ||
| $ch .= preg_quote($name, "/"); | ||
| } else { | ||
| $br[] = preg_quote($name, "/"); | ||
| } | ||
| } else { | ||
| $x = preg_quote($name, "/"); | ||
| if (($op->flags & SearchOperator::F_ALLOW_SUBTYPE) !== 0) { | ||
| $x .= '(?::\w+)?'; | ||
| } | ||
| $alnum[] = $x; | ||
| } | ||
| } | ||
| if ($ch !== "") { | ||
| $br[] = "[{$ch}]"; | ||
| } | ||
| if (!empty($alnum)) { | ||
| $br[] = '(?:' . join("|", $alnum) . ')(?=[\s\(\)]|\z)'; | ||
| } | ||
| $this->regex = '/\G(?:' . join("|", $br) . ')/s'; | ||
| return $this->regex; | ||
| } | ||
|
|
||
| /** @return SearchOperatorSet */ | ||
| static function paper_search_operators() { | ||
| if (self::$psops !== null) { | ||
| return self::$psops; | ||
| } | ||
| $psops = new SearchOperatorSet; | ||
| $psops->define("(", new SearchOperator("(", 0, SearchOperator::F_UNARY)); | ||
| $psops->define(")", new SearchOperator(")", 0, SearchOperator::F_UNARY)); | ||
| $op = new SearchOperator("not", 8, SearchOperator::F_UNARY); | ||
| $psops->define("NOT", $op); | ||
| $psops->define("not", $op); | ||
| $psops->define("-", $op); | ||
| $psops->define("!", $op); | ||
| $psops->define("+", new SearchOperator("+", 8, SearchOperator::F_UNARY)); | ||
| $psops->define("SPACE", new SearchOperator("space", 7, SearchOperator::F_UNNAMED)); | ||
| $op = new SearchOperator("and", 6, 0); | ||
| $psops->define("AND", $op); | ||
| $psops->define("and", $op); | ||
| $psops->define("&&", $op); | ||
| $op = new SearchOperator("xor", 5, 0); | ||
| $psops->define("XOR", $op); | ||
| $psops->define("xor", $op); | ||
| $psops->define("^^", $op); | ||
| $op = new SearchOperator("or", 4, 0); | ||
| $psops->define("OR", $op); | ||
| $psops->define("or", $op); | ||
| $psops->define("||", $op); | ||
| $psops->define("SPACEOR", new SearchOperator("or", 3, SearchOperator::F_UNNAMED)); | ||
| $op = new SearchOperator("then", 2, 0); | ||
| $psops->define("THEN", $op); | ||
| $psops->define("then", $op); | ||
| $psops->define("HIGHLIGHT", new SearchOperator("highlight", 1, SearchOperator::F_ALLOW_SUBTYPE)); | ||
| self::$psops = $psops; | ||
| return $psops; | ||
| } | ||
| } |
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