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New libraries to support lexer-based searching. From Tony Hursh - thanks!
This commit is contained in:
moodler
parent
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393
lib/lexer.php
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393
lib/lexer.php
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@ -0,0 +1,393 @@
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<?php // $Id$
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/* PHP lexer code snarfed from the CVS tree for the lamplib project at
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* http://sourceforge.net/projects/lamplib
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* This project is administered by Markus Baker, Harry Fuecks and Matt
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* Mitchell, and the project code is in the public domain.
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*
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* Thanks, guys!
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*/
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define("LEXER_ENTER", 1);
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define("LEXER_MATCHED", 2);
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define("LEXER_UNMATCHED", 3);
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define("LEXER_EXIT", 4);
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define("LEXER_SPECIAL", 5);
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/**
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* Compounded regular expression. Any of
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* the contained patterns could match and
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* when one does it's label is returned.
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*/
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class ParallelRegex {
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var $_patterns;
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var $_labels;
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var $_regex;
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var $_case;
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/**
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* Constructor. Starts with no patterns.
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* @param $case True for case sensitive, false
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* for insensitive.
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* @public
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*/
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function ParallelRegex($case) {
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$this->_case = $case;
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$this->_patterns = array();
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$this->_labels = array();
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$this->_regex = null;
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}
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/**
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* Adds a pattern with an optional label.
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* @param $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param $label Label of regex to be returned
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* on a match.
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* @public
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*/
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function addPattern($pattern, $label = true) {
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$count = count($this->_patterns);
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$this->_patterns[$count] = $pattern;
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$this->_labels[$count] = $label;
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$this->_regex = null;
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}
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/**
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* Attempts to match all patterns at once against
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* a string.
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* @param $subject String to match against.
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* @param $match First matched portion of
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* subject.
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* @return True on success.
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* @public
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*/
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function match($subject, &$match) {
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if (count($this->_patterns) == 0) {
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return false;
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}
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if (!preg_match($this->_getCompoundedRegex(), $subject, $matches)) {
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$match = "";
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return false;
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}
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$match = $matches[0];
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for ($i = 1; $i < count($matches); $i++) {
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if ($matches[$i]) {
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return $this->_labels[$i - 1];
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}
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}
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return true;
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}
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/**
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* Compounds the patterns into a single
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* regular expression separated with the
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* "or" operator. Caches the regex.
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* Will automatically escape (, ) and / tokens.
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* @param $patterns List of patterns in order.
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* @private
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*/
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function _getCompoundedRegex() {
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if ($this->_regex == null) {
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for ($i = 0; $i < count($this->_patterns); $i++) {
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$this->_patterns[$i] = '(' . str_replace(
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array('/', '(', ')'),
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array('\/', '\(', '\)'),
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$this->_patterns[$i]) . ')';
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}
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$this->_regex = "/" . implode("|", $this->_patterns) . "/" . $this->_getPerlMatchingFlags();
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}
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return $this->_regex;
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}
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/**
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* Accessor for perl regex mode flags to use.
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* @return Flags as string.
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* @private
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*/
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function _getPerlMatchingFlags() {
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return ($this->_case ? "msS" : "msSi");
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}
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}
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/**
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* States for a stack machine.
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*/
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class StateStack {
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var $_stack;
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/**
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* Constructor. Starts in named state.
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* @param $start Starting state name.
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* @public
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*/
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function StateStack($start) {
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$this->_stack = array($start);
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}
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/**
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* Accessor for current state.
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* @return State as string.
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* @public
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*/
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function getCurrent() {
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return $this->_stack[count($this->_stack) - 1];
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}
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/**
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* Adds a state to the stack and sets it
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* to be the current state.
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* @param $state New state.
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* @public
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*/
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function enter($state) {
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array_push($this->_stack, $state);
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}
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/**
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* Leaves the current state and reverts
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* to the previous one.
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* @return False if we drop off
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* the bottom of the list.
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* @public
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*/
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function leave() {
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if (count($this->_stack) == 1) {
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return false;
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}
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array_pop($this->_stack);
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return true;
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}
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}
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/**
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* Accepts text and breaks it into tokens.
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* Some optimisation to make the sure the
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* content is only scanned by the PHP regex
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* parser once. Lexer modes must not start
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* with leading underscores.
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*/
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class Lexer {
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var $_regexes;
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var $_parser;
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var $_mode;
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var $_mode_handlers;
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var $_case;
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/**
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* Sets up the lexer in case insensitive matching
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* by default.
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* @param $parser Handling strategy by
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* reference.
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* @param $start Starting handler.
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* @param $case True for case sensitive.
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* @public
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*/
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function Lexer(&$parser, $start = "accept", $case = false) {
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$this->_case = $case;
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$this->_regexes = array();
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$this->_parser = &$parser;
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$this->_mode = new StateStack($start);
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$this->_mode_handlers = array();
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}
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/**
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* Adds a token search pattern for a particular
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* parsing mode. The pattern does not change the
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* current mode.
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* @param $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param $mode Should only apply this
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* pattern when dealing with
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* this type of input.
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* @public
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*/
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function addPattern($pattern, $mode = "accept") {
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if (!isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern);
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}
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/**
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* Adds a pattern that will enter a new parsing
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* mode. Useful for entering parenthesis, strings,
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* tags, etc.
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* @param $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param $mode Should only apply this
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* pattern when dealing with
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* this type of input.
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* @param $new_mode Change parsing to this new
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* nested mode.
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* @public
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*/
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function addEntryPattern($pattern, $mode, $new_mode) {
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if (!isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern, $new_mode);
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}
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/**
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* Adds a pattern that will exit the current mode
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* and re-enter the previous one.
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* @param $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param $mode Mode to leave.
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* @public
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*/
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function addExitPattern($pattern, $mode) {
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if (!isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern, "__exit");
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}
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/**
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* Adds a pattern that has a special mode.
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* Acts as an entry and exit pattern in one go.
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* @param $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param $mode Should only apply this
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* pattern when dealing with
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* this type of input.
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* @param $special Use this mode for this one token.
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* @public
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*/
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function addSpecialPattern($pattern, $mode, $special) {
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if (!isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern, "_$special");
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}
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/**
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* Adds a mapping from a mode to another handler.
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* @param $mode Mode to be remapped.
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* @param $handler New target handler.
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* @public
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*/
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function mapHandler($mode, $handler) {
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$this->_mode_handlers[$mode] = $handler;
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}
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/**
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* Splits the page text into tokens. Will fail
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* if the handlers report an error or if no
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* content is consumed. If successful then each
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* unparsed and parsed token invokes a call to the
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* held listener.
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* @param $raw Raw HTML text.
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* @return True on success, else false.
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* @public
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*/
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function parse($raw) {
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if (!isset($this->_parser)) {
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return false;
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}
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$length = strlen($raw);
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while (is_array($parsed = $this->_reduce($raw))) {
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list($unmatched, $matched, $mode) = $parsed;
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if (!$this->_dispatchTokens($unmatched, $matched, $mode)) {
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return false;
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}
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if (strlen($raw) == $length) {
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return false;
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}
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$length = strlen($raw);
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}
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if (!$parsed) {
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return false;
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}
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return $this->_invokeParser($raw, LEXER_UNMATCHED);
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}
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/**
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* Sends the matched token and any leading unmatched
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* text to the parser changing the lexer to a new
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* mode if one is listed.
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* @param $unmatched Unmatched leading portion.
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* @param $matched Actual token match.
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* @param $mode Mode after match. The "_exit"
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* mode causes a stack pop. An
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* false mode causes no change.
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* @return False if there was any error
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* from the parser.
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* @private
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*/
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function _dispatchTokens($unmatched, $matched, $mode = false) {
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if (!$this->_invokeParser($unmatched, LEXER_UNMATCHED)) {
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return false;
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}
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if ($mode === "__exit") {
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if (!$this->_invokeParser($matched, LEXER_EXIT)) {
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return false;
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}
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return $this->_mode->leave();
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}
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if (strncmp($mode, "_", 1) == 0) {
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$mode = substr($mode, 1);
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$this->_mode->enter($mode);
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if (!$this->_invokeParser($matched, LEXER_SPECIAL)) {
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return false;
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}
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return $this->_mode->leave();
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}
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if (is_string($mode)) {
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$this->_mode->enter($mode);
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return $this->_invokeParser($matched, LEXER_ENTER);
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}
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return $this->_invokeParser($matched, LEXER_MATCHED);
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}
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/**
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* Calls the parser method named after the current
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* mode. Empty content will be ignored.
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* @param $content Text parsed.
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* @param $is_match Token is recognised rather
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* than unparsed data.
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* @private
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*/
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function _invokeParser($content, $is_match) {
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if (($content === "") || ($content === false)) {
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return true;
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}
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$handler = $this->_mode->getCurrent();
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if (isset($this->_mode_handlers[$handler])) {
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$handler = $this->_mode_handlers[$handler];
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}
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return $this->_parser->$handler($content, $is_match);
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}
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/**
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* Tries to match a chunk of text and if successful
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* removes the recognised chunk and any leading
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* unparsed data. Empty strings will not be matched.
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* @param $raw The subject to parse. This is the
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* content that will be eaten.
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* @return Three item list of unparsed
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* content followed by the
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* recognised token and finally the
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* action the parser is to take.
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* True if no match, false if there
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* is a parsing error.
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* @private
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*/
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function _reduce(&$raw) {
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if (!isset($this->_regexes[$this->_mode->getCurrent()])) {
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return false;
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}
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if ($raw === "") {
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return true;
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}
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if ($action = $this->_regexes[$this->_mode->getCurrent()]->match($raw, $match)) {
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$count = strpos($raw, $match);
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$unparsed = substr($raw, 0, $count);
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$raw = substr($raw, $count + strlen($match));
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return array($unparsed, $match, $action);
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}
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return true;
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}
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}
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?>
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262
lib/searchlib.php
Normal file
262
lib/searchlib.php
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<?php // $Id$
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require_once($CFG->libdir.'/lexer.php');
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// Constants for the various types of tokens
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define("T_USER","0");
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define("T_META","1");
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define("T_EXACT","2");
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define("T_NEGATE","3");
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define("T_STRING","4");
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// Class to hold token/value pairs after they're parsed.
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class search_token {
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var $value;
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var $type;
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function search_token($type,$value){
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$this->type = $type;
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$this->value = $this->sanitize($value);
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}
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// Try to clean up user input to avoid potential security issues.
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// Need to think about this some more.
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function sanitize($userstring){
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return htmlentities(addslashes($userstring));
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}
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function getValue(){
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return $this->value;
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}
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function getType(){
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return $this->type;
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}
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}
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// This class does the heavy lifting of lexing the search string into tokens.
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// Using a full-blown lexer is probably overkill for this application, but
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// might be useful for other tasks.
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class search_lexer extends Lexer{
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function search_lexer($parser){
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// Call parent constructor.
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$this->Lexer($parser);
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//Set up the state machine and pattern matches for transitions.
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// Patterns to handle strings of the form user:foo
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// If we see the string user: while in the base accept state, start
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// parsing a username and go to the inusername state.
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$this->addEntryPattern("user:\S+","accept","inusername");
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// Snarf everything into the username until we see whitespace, then exit
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// back to the base accept state.
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$this->addExitPattern("\s","inusername");
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// Patterns to handle strings of the form meta:foo
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// If we see the string meta: while in the base accept state, start
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// parsing a username and go to the inmeta state.
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$this->addEntryPattern("subject:\S+","accept","inmeta");
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// Snarf everything into the meta token until we see whitespace, then exit
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// back to the base accept state.
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$this->addExitPattern("\s","inmeta");
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// Patterns to handle required exact match strings (+foo) .
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// If we see a + sign while in the base accept state, start
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// parsing an exact match string and enter the inrequired state
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$this->addEntryPattern("\+\S+","accept","inrequired");
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// When we see white space, exit back to accept state.
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$this->addExitPattern("\s","inrequired");
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// Handle excluded strings (-foo)
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// If we see a - sign while in the base accept state, start
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// parsing an excluded string and enter the inexcluded state
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$this->addEntryPattern("\-\S+","accept","inexcluded");
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// When we see white space, exit back to accept state.
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$this->addExitPattern("\s","inexcluded");
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// Patterns to handle quoted strings.
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// If we see a quote while in the base accept state, start
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// parsing a quoted string and enter the inquotedstring state.
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// Grab everything until we see the closing quote.
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$this->addEntryPattern("\"[^\"]+","accept","inquotedstring");
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// When we see a closing quote, reenter the base accept state.
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$this->addExitPattern("\"","inquotedstring");
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// Patterns to handle ordinary, nonquoted words.
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// When we see non-whitespace, snarf everything into the nonquoted word
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// until we see whitespace again.
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$this->addEntryPattern("\S+","accept","plainstring");
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// Once we see whitespace, reenter the base accept state.
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$this->addExitPattern("\s","plainstring");
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}
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}
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||||
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||||
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||||
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// This class takes care of sticking the proper token type/value pairs into
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// the parsed token array.
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// Most functions in this class should only be called by the lexer, the
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// one exception being getParseArray() which returns the result.
|
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class search_parser {
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var $tokens;
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|
||||
// This function is called by the code that's interested in the result of the parse operation.
|
||||
function get_parsed_array(){
|
||||
return $this->tokens;
|
||||
}
|
||||
|
||||
/*
|
||||
* Functions below this are part of the state machine for the parse
|
||||
* operation and should not be called directly.
|
||||
*/
|
||||
|
||||
// Base state. No output emitted.
|
||||
function accept() {
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// State for handling user:foo constructs. Potentially emits a token.
|
||||
function inusername($content){
|
||||
if(strlen($content) < 6) // State exit or missing parameter.
|
||||
return true;
|
||||
// Strip off the user: part and add the reminder to the parsed token array
|
||||
$param = trim(substr($content,5));
|
||||
$this->tokens[] = new search_token(T_USER,$param);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// State for handling meta:foo constructs. Potentially emits a token.
|
||||
function inmeta($content){
|
||||
if(strlen($content) < 9) // Missing parameter.
|
||||
return true;
|
||||
// Strip off the meta: part and add the reminder to the parsed token array.
|
||||
$param = trim(substr($content,8));
|
||||
$this->tokens[] = new search_token(T_META,$param);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// State entered when we've seen a required string (+foo). Potentially
|
||||
// emits a token.
|
||||
function inrequired($content){
|
||||
if(strlen($content) < 2) // State exit or missing parameter, don't emit.
|
||||
return true;
|
||||
// Strip off the + sign and add the reminder to the parsed token array.
|
||||
$this->tokens[] = new search_token(T_EXACT,substr($content,1));
|
||||
return true;
|
||||
}
|
||||
|
||||
// State entered when we've seen an excluded string (-foo). Potentially
|
||||
// emits a token.
|
||||
function inexcluded($content){
|
||||
if(strlen($content) < 2) // State exit or missing parameter.
|
||||
return true;
|
||||
// Strip off the -sign and add the reminder to the parsed token array.
|
||||
$this->tokens[] = new search_token(T_NEGATE,substr($content,1));
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// State entered when we've seen a quoted string. Potentially emits a token.
|
||||
function inquotedstring($content){
|
||||
if(strlen($content) < 2) // State exit or missing parameter.
|
||||
return true;
|
||||
// Strip off the opening quote and add the reminder to the parsed token array.
|
||||
$this->tokens[] = new search_token(T_STRING,substr($content,1));
|
||||
return true;
|
||||
}
|
||||
|
||||
// State entered when we've seen an ordinary, non-quoted word. Potentially
|
||||
// emits a token.
|
||||
function plainstring($content){
|
||||
if(ctype_space($content)) // State exit
|
||||
return true;
|
||||
// Add the string to the parsed token array.
|
||||
$this->tokens[] = new search_token(T_STRING,$content);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
|
||||
}
|
||||
|
||||
|
||||
// Primitive function to generate a SQL string from a parse tree.
|
||||
// Parameters:
|
||||
//
|
||||
// $parsetree should be a parse tree generated by a
|
||||
// search_lexer/search_parser combination.
|
||||
// Other fields are database table names to search.
|
||||
|
||||
function search_generate_SQL($parsetree,$datafield,$metafield,$mainidfield,$useridfield,$userfirstnamefield,$userlastnamefield){
|
||||
global $CFG;
|
||||
if ($CFG->dbtype == "postgres7") {
|
||||
$LIKE = "ILIKE"; // case-insensitive
|
||||
$NOTLIKE = "NOT ILIKE"; // case-insensitive
|
||||
$REGEXP = "~*";
|
||||
$NOTREGEXP = "!~*";
|
||||
} else {
|
||||
$LIKE = "LIKE";
|
||||
$NOTLIKE = "NOT LIKE";
|
||||
$REGEXP = "REGEXP";
|
||||
$NOTREGEXP = "NOT REGEXP";
|
||||
}
|
||||
|
||||
$ntokens = count($parsetree);
|
||||
if($ntokens == 0)
|
||||
return "";
|
||||
|
||||
for($i = 0; $i < $ntokens; $i++){
|
||||
if($i > 0) // We have more than one clause, need to tack on AND
|
||||
$SQLString .= " AND ";
|
||||
|
||||
$type = $parsetree[$i]->getType();
|
||||
$value = $parsetree[$i]->getValue();
|
||||
switch($type){
|
||||
case T_STRING : $SQLString .= "(($datafield $LIKE '%$value%') OR ($metafield $LIKE '%$value%') )";
|
||||
break;
|
||||
case T_EXACT:
|
||||
$SQLString .= "(($datafield $REGEXP '[[:<:]]".$value."[[:>:]]') OR ($metafield $REGEXP '[[:<:]]".$value."[[:>:]]'))";
|
||||
break;
|
||||
case T_META : if($metafield != "")
|
||||
$SQLString .= "($metafield $LIKE '%$value%')";
|
||||
break;
|
||||
case T_USER : $SQLString .= "(($mainidfield = $useridfield) AND (($userfirstnamefield $LIKE '%$value%') OR ($userlastnamefield $LIKE '%$value%')))";
|
||||
break;
|
||||
case T_NEGATE: $SQLString .= "(NOT (($datafield $LIKE '%$value%') OR ($metafield $LIKE '%$value%')))";
|
||||
break;
|
||||
default:
|
||||
return "";
|
||||
|
||||
}
|
||||
}
|
||||
return $SQLString;
|
||||
}
|
||||
|
||||
|
||||
?>
|
||||
Loading…
x
Reference in New Issue
Block a user