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em_manager_helper.php
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em_manager_helper.php
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<?php
/**
* LimeSurvey
* Copyright (C) 2007-2011 The LimeSurvey Project Team / Carsten Schmitz
* All rights reserved.
* License: GNU/GPL License v2 or later, see LICENSE.php
* LimeSurvey is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*
*/
/**
* Description of LimeExpressionManager
* This is a wrapper class around ExpressionManager that implements a Singleton and eases
* passing of LimeSurvey variable values into ExpressionManager
*
* @author Thomas M. White (TMSWhite)
*/
include_once('em_core_helper.php');
Yii::app()->loadHelper('database');
Yii::app()->loadHelper('frontend');
Yii::import("application.libraries.Date_Time_Converter");
define('LEM_DEBUG_TIMING',1);
define('LEM_DEBUG_VALIDATION_SUMMARY',2); // also includes SQL error messages
define('LEM_DEBUG_VALIDATION_DETAIL',4);
define('LEM_PRETTY_PRINT_ALL_SYNTAX',32);
define('LEM_DEFAULT_PRECISION',12);
class LimeExpressionManager {
/**
* LimeExpressionManager is a singleton. $instance is its storage location.
* @var LimeExpressionManager
*/
private static $instance;
/**
* Implements the recursive descent parser that processes expressions
* @var ExpressionManager
*/
private $em;
/**
*
* @var type
*/
private $groupRelevanceInfo;
/**
* The survey ID
* @var integer
*/
private $sid;
/**
* sum of LEM_DEBUG constants - use bitwise AND comparisons to identify which parts to use
* @var type
*/
private $debugLevel=0;
/**
* sPreviewMode used for relevance equation force to 1 in preview mode
* @var string
*/
private $sPreviewMode=false;
/**
* Collection of variable attributes, indexed by SGQA code
*
* Actual variables are stored in this structure:
* $knownVars[$sgqa] = array(
* 'jsName_on' => // the name of the javascript variable if it is defined on the current page - often 'answerSGQA'
* 'jsName' => // the name of the javascript variable when referenced on different pages - usually 'javaSGQA'
* 'readWrite' => // 'Y' for yes, 'N' for no - currently not used
* 'hidden' => // 1 if the question attribute 'hidden' is true, otherwise 0
* 'question' => // the text of the question (or sub-question)
* 'qid' => // the numeric question id - e.g. the Q part of the SGQA name
* 'gid' => // the numeric group id - e.g. the G part of the SGQA name
* 'grelevance' => // the group level relevance string
* 'relevance' => // the question level relevance string
* 'qcode' => // the qcode-style variable name for this question (or sub-question)
* 'qseq' => // the 0-based index of the question within the survey
* 'gseq' => // the 0-based index of the group within the survey
* 'type' => // the single character type code for the question
* 'sgqa' => // the SGQA name for the variable
* 'ansList' => // ansArray converted to a JavaScript fragment - e.g. ",'answers':{ 'M':'Male','F':'Female'}"
* 'ansArray' => // PHP array of answer strings, keyed on the answer code = e.g. array['M']='Male';
* 'scale_id' => // '0' for most answers. '1' for second scale within dual-scale questions
* 'rootVarName' => // the root code / name / title for the question, without any sub-question or answer-level suffix. This is from the title column in the questions table
* 'subqtext' => // the sub-question text
* 'rowdivid' => // the JavaScript ID of the row identifier for a question. This is used to show/hide entire question rows
* 'onlynum' => // 1 if only numbers are allowed for this variable. If so, then extra processing is needed to ensure that can use comma as a decimal separator
* );
*
* Reserved variables (e.g. TOKEN:xxxx) are stored with this structure:
* $knownVars[$token] = array(
* 'code' => // the static value for the variable
* 'type' => // ''
* 'jsName_on' => // ''
* 'jsName' => // ''
* 'readWrite' => // 'N' - since these are always read-only variables
* );
*
* @var type
*/
private $knownVars;
/**
* maps qcode varname to SGQA code
*
* @example ['gender'] = '38612X10X145'
* @var type
*/
private $qcode2sgqa;
/**
* variables temporarily set for substitution purposes
*
* These are typically the LimeReplacement Fields passed in via templatereplace()
* Each has the following structure: array(
* 'code' => // the static value of the variable
* 'jsName_on' => // ''
* 'jsName' => // ''
* 'readWrite' => // 'N'
* );
*
* @var type
*/
private $tempVars;
/**
* Array of relevance information for each page (gseq), indexed by gseq.
* Within a page, it contains a sequential list of the results of each relevance equation processed
* array(
* 'qid' => // question id -- e.g. 154
* 'gseq' => // 0-based group sequence -- e.g. 2
* 'eqn' => // the raw relevance equation parsed -- e.g. "!is_empty(p2_sex)"
* 'result' => // the Boolean result of parsing that equation in the current context -- e.g. 0
* 'numJsVars' => // the number of dynamic JavaScript variables used in that equation -- e.g. 1
* 'relevancejs' => // the actual JavaScript to insert for that relevance equation -- e.g. "LEMif(LEManyNA('p2_sex'),'',( ! LEMempty(LEMval('p2_sex') )))"
* 'relevanceVars' => // a pipe-delimited list of JavaScript variables upon which that equation depends -- e.g. "java38612X12X153"
* 'jsResultVar' => // the JavaScript variable in which that result will be stored -- e.g. "java38612X12X154"
* 'type' => // the single character type of the question -- e.g. 'S'
* 'hidden' => // 1 if the question should always be hidden
* 'hasErrors' => // 1 if there were parsing errors processing that relevance equation
* @var type
*/
private $pageRelevanceInfo;
/**
*
* @var type
*/
private $pageTailorInfo;
/**
* internally set to true (1) for survey.php so get group-specific logging but keep javascript variable namings consistent on the page.
* @var type
*/
private $allOnOnePage=false;
/**
* survey mode. One of 'survey', 'group', or 'question'
* @var string
*/
private $surveyMode='group';
/**
* a set of global survey options passed from LimeSurvey
*
* For example, array(
* 'rooturl' => // URL prefix needed to be able to click on a syntax-highlighted variable name and have it open the needed editting window
* 'hyperlinkSyntaxHighlighting' => // true if should be able to click on variables to edit them
* 'active' => // 0 for inactive, 1 for active survey
* 'allowsave' => // 0 for do not allow save; 1 for allow save
* 'anonymized' => // 1 for anonymous
* 'assessments' => // 1 for use assessments
* 'datestamp' => // 1 for use date stamps
* 'ipaddr' => // 1 for capture IP address
* 'radix' => // '.' for use period as decimal separator; ',' for use comma as decimal separator
* 'savetimings' => // "Y" if should save survey timings
* 'startlanguage' => // the starting language -- e.g. 'en'
* 'surveyls_dateformat' => // the index of the language specific date format -- e.g. 1
* 'tablename' => // the name of the table storing the survey data, if active -- e.g. lime_survey_38612
* 'target' => // the path for uploading files -- e.g. '/temp/files/'
* 'timeadjust' => // the time offset -- e.g. 0
* 'tempdir' => // the temporary directory for uploading files -- e.g. '/temp/'
* );
*
* @var type
*/
private $surveyOptions=array();
/**
* array of mappings of Question # (qid) to pipe-delimited list of SGQA codes used within it
*
* @example [150] = "38612X11X150|38612X11X150other"
* @var type
*/
private $qid2code;
/**
* array of mappings of JavaScript Variable names to Question number (qid)
*
* @example ['java38612X13X161other'] = '161'
* @var type
*/
private $jsVar2qid;
/**
* maps name of the variable to the SGQ name (without the A suffix)
*
* @example ['p1_sex'] = "38612X10X147"
* @example ['afDS_sq1_1'] = "26626X37X705sq1#1"
* @var type
*/
private $qcode2sgq;
/**
* array of mappings of knownVar aliases to the JavaScript variable names.
* This maps both the SGQA and qcode alias names to the same 2 dimensional array
*
* @example ['p1_sex'] = array(
* 'jsName' => // the JavaScript variable name used by EM -- e.g. "java38612X11X147"
* 'jsPart' => // the JavaScript fragment used in EM's ____ array -- e.g. "'p1_sex':'java38612X11X147'"
* );
* @example ['afDS_sq1_1] = array(
* 'jsName' => "java26626X37X705sq1#1"
* 'jsPart' => "'afDS_sq1_1':'java26626X37X705sq1#1'"
* );
* @var type
*/
private $alias2varName;
/**
* JavaScript array of mappings of canonical JavaScript variable name to key attributes.
* These fragments are used to create the JavaScript varNameAttr array.
*
* @example ['java38612X11X147'] = "'java38612X11X147':{ 'jsName':'java38612X11X147','jsName_on':'java38612X11X147','sgqa':'38612X11X147','qid':147,'gid':11,'type':'G','default':'','rowdivid':'','onlynum':'','gseq':1,'answers':{ 'M':'Male','F':'Female'}}"
* @example ['java26626X37X705sq1#1'] = "'java26626X37X705sq1#1':{ 'jsName':'java26626X37X705sq1#1','jsName_on':'java26626X37X705sq1#1','sgqa':'26626X37X705sq1#1','qid':705,'gid':37,'type':'1','default':'','rowdivid':'26626X37X705sq1','onlynum':'','gseq':1,'answers':{ '0~1':'1|Low','0~2':'2|Medium','0~3':'3|High','1~1':'1|Never','1~2':'2|Sometimes','1~3':'3|Always'}}"
*
* @var type
*/
private $varNameAttr;
/**
* array of enumerated answer lists indexed by qid
* These use a tilde syntax to indicate which scale the answer is part of.
*
* @example ['0~4'] = "4|Child" // this means that code 4 in scale 0 has a coded value of 4 and a display value of 'Child'
* @example (for [705]): ['1~2'] = '2|Sometimes' // this means that the second scale for this question uses the coded value of 2 to represent 'Sometimes'
* @example // TODO - add example from survey using assessments
*
* @var type
*/
private $qans;
/**
* map of gid to 0-based sequence number of groups
*
* @example [10] = 0 // means that the first group (gseq=0) has gid=10
*
* @var type
*/
private $groupId2groupSeq;
/**
* map question # to an incremental count of question order across the whole survey
*
* @example [157] = 13 // means that that 14th question in the survey has qid=157
*
* @var type
*/
private $questionId2questionSeq;
/**
* map question # to the group it is within, using an incremental count of group order
*
* @example [157] = 2 // means that qid 157 is in the 3rd page of questions (gseq = 2)
*
* @var type
*/
private $questionId2groupSeq;
/**
* array of info about each Group, indexed by GroupSeq
*
* @example [2] = array(
* 'qstart' => 9 // the first qseq within that group
* 'qend' => 13 //the last qseq within that group
* );
*
* @var type
*/
private $groupSeqInfo;
/**
* tracks which groups have at least one relevant, non-hidden question
*
* @example [2] = 0 // means that the third group (gseq==2) is currently irrelevant
*
* @var type
*/
private $gseq2relevanceStatus;
/**
* maps question # to the validation equation(s) for that question.
* These are grouped by qid then validation type, such as 'value_range', and 'num_answers'
*
* @example [703] = array(
* 'eqn' => array(
* 'value_range' = "((is_empty(26626X34X703.NAOK) || 26626X34X703.NAOK >= (0)) and (is_empty(26626X34X703.NAOK) || 26626X34X703.NAOK <= (5)))"
* ),
* 'tips' => array(
* 'value_range' = "Each answer must be between {fixnum(0)} and {fixnum(5)}"
* ),
* 'subqValidEqns' = array(
* [] = array(
* 'subqValidSelector' => '' //
* 'subqValidEqn' => "(is_empty(26626X34X703.NAOK) || 26626X34X703.NAOK >= (0)) && (is_empty(26626X34X703.NAOK) || 26626X34X703.NAOK <= (5))"
* ),
* 'sumEqn' => '' // the equation to compute the current sum of the responses
* 'sumRemainingEqn' => '' // the equation to how much is left (for the question attribute that lets you specify the exact value of the sum of the answers)
* );
*
* @var type
*/
private $qid2validationEqn;
/**
* keeps relevance in proper sequence so can minimize relevance processing to see what should be see on page and in indexes
* Array is indexed on qseq
*
* @example [3] = array(
* 'relevance' => "!is_empty(num)" // the question-level relevance equation
* 'grelevance' => "" // the group-level relevance equation
* 'qid' => "699" // the question id
* 'qseq' => 3 // the 0-index question sequence
* 'gseq' => 0 // the 0-index group sequence
* 'jsResultVar_on' => 'answer26626X34X699' // the javascript variable holding the input value
* 'jsResultVar' => 'java26226X34X699' // the javascript variable (often hidden) holding the value to be submitted
* 'type' => 'N' // the one character question type
* 'hidden' => 0 // 1 if it should be always_hidden
* 'gid' => "34" // group id
* 'mandatory' => 'N' // 'Y' if mandatory
* 'eqn' => "" // TODO ??
* 'help' => "" // the help text
* 'qtext' => "Enter a larger number than {num}" // the question text
* 'code' => 'afDS_sq5_1' // the full variable name
* 'other' => 'N' // whether the question supports the 'other' option - 'Y' if true
* 'rowdivid' => '2626X37X705sq5' // the javascript id for the row - in this case, the 5th sub-question
* 'aid' => 'sq5' // the answer id
* 'sqid' => '791' // the sub-question's qid (only populated for some question types)
* );
*
* @var type
*/
private $questionSeq2relevance;
/**
* current Group sequence (0-based index)
* @example 1
* @var integer
*/
private $currentGroupSeq;
/**
* for Question-by-Question mode, the 0-based index
* @example 3
* @var integer
*/
private $currentQuestionSeq;
/**
* used in Question-by-Question mode
* @var integer
*/
private $currentQID;
/**
* set of the current set of questions to be displayed, indexed by QID - at least one must be relevant
*
* The array has N entries, where N is the number if qids in the Qset. Each has the following contents:
* @example [705] = array(
* 'info' => array() // this is an exact copy of $questionSeq2relevance[$qseq] -- TODO - remove redundancy
* 'relevant' => 1 // 1 if the question is currently relevant
* 'hidden' => 0 // 1 if the question is always hidden
* 'relEqn' => '' // the relevance equation -- TODO - how different from ['info']['relevance']?
* 'sgqa' => // pipe-separated list of SGQA codes for this question -- e.g. "26626X37X705sq1#0|26626X37X705sq1#1|26626X37X705sq2#0|26626X37X705sq2#1|26626X37X705sq3#0|26626X37X705sq3#1|26626X37X705sq4#0|26626X37X705sq4#1|26626X37X705sq5#0|26626X37X705sq5#1"
* 'unansweredSQs' => // pipe-separated list of currently unanswered SGQA codes for this question -- e.g. "26626X37X705sq1#0|26626X37X705sq1#1|26626X37X705sq3#0|26626X37X705sq3#1|26626X37X705sq5#0|26626X37X705sq5#1"
* 'valid' => 0 // 1 if the current answers pass all of the validation criteria for the question
* 'validEqn' => // the auto-generated validation criteria, based upon advanced question attributes -- e.g. "((count(if(count(26626X37X705sq1#0.NAOK,26626X37X705sq1#1.NAOK)==2,1,''), if(count(26626X37X705sq2#0.NAOK,26626X37X705sq2#1.NAOK)==2,1,''), if(count(26626X37X705sq3#0.NAOK,26626X37X705sq3#1.NAOK)==2,1,''), if(count(26626X37X705sq4#0.NAOK,26626X37X705sq4#1.NAOK)==2,1,''), if(count(26626X37X705sq5#0.NAOK,26626X37X705sq5#1.NAOK)==2,1,'')) >= (minSelect)) and (count(if(count(26626X37X705sq1#0.NAOK,26626X37X705sq1#1.NAOK)==2,1,''), if(count(26626X37X705sq2#0.NAOK,26626X37X705sq2#1.NAOK)==2,1,''), if(count(26626X37X705sq3#0.NAOK,26626X37X705sq3#1.NAOK)==2,1,''), if(count(26626X37X705sq4#0.NAOK,26626X37X705sq4#1.NAOK)==2,1,''), if(count(26626X37X705sq5#0.NAOK,26626X37X705sq5#1.NAOK)==2,1,'')) <= (maxSelect)))"
* 'prettyValidEqn' => // syntax-highlighted version of validEqn, only showing syntax errors
* 'validTip' => // html fragment to insert for the validation tip -- e.g. "<div id='vmsg_705_num_answers' class='em_num_answers'>Please select between 1 and 3 answer(s)</div>"
* 'prettyValidTip' => // version of validTip that can be parsed by EM to create dynmamic validation -- e.g. "<div id='vmsg_705_num_answers' class='em_num_answers'>Please select between {fixnum(minSelect)} and {fixnum(maxSelect)} answer(s)</div>"
* 'validJS' => // JavaScript fragment that can perform validation. This is the result of parsing validEqn -- e.g. "LEMif(LEManyNA('minSelect', 'maxSelect'),'',(((LEMcount(LEMif(LEMcount(LEMval('26626X37X705sq1#0.NAOK') , LEMval('26626X37X705sq1#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq2#0.NAOK') , LEMval('26626X37X705sq2#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq3#0.NAOK') , LEMval('26626X37X705sq3#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq4#0.NAOK') , LEMval('26626X37X705sq4#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq5#0.NAOK') , LEMval('26626X37X705sq5#1.NAOK') ) == 2, 1, '')) >= (LEMval('minSelect') )) && (LEMcount(LEMif(LEMcount(LEMval('26626X37X705sq1#0.NAOK') , LEMval('26626X37X705sq1#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq2#0.NAOK') , LEMval('26626X37X705sq2#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq3#0.NAOK') , LEMval('26626X37X705sq3#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq4#0.NAOK') , LEMval('26626X37X705sq4#1.NAOK') ) == 2, 1, ''), LEMif(LEMcount(LEMval('26626X37X705sq5#0.NAOK') , LEMval('26626X37X705sq5#1.NAOK') ) == 2, 1, '')) <= (LEMval('maxSelect') )))))"
* 'invalidSQs' => // current list of subquestions that fail validation criteria -- e.g. "26626X37X705sq1#0|26626X37X705sq1#1|26626X37X705sq2#0|26626X37X705sq2#1|26626X37X705sq3#0|26626X37X705sq3#1|26626X37X705sq4#0|26626X37X705sq4#1|26626X37X705sq5#0|26626X37X705sq5#1"
* 'relevantSQs' => // current list of subquestions that are relevant -- e.g. "26626X37X705sq1#0|26626X37X705sq1#1|26626X37X705sq2#0|26626X37X705sq2#1|26626X37X705sq3#0|26626X37X705sq3#1|26626X37X705sq4#0|26626X37X705sq4#1|26626X37X705sq5#0|26626X37X705sq5#1"
* 'irrelevantSQs' => // current list of subquestions that are irrelevant -- e.g. "26626X37X705sq2#0|26626X37X705sq2#1|26626X37X705sq4#0|26626X37X705sq4#1"
* 'subQrelEqn' => // TODO - ??
* 'mandViolation' => 0 // 1 if the question is mandatory and fails the mandatory criteria
* 'anyUnanswered' => 1 // 1 if any parts of the question are unanswered
* 'mandTip' => '' // message to display if the question fails mandatory criteria
* 'message' => '' // TODO ??
* 'updatedValues' => // array of values that should be updated for this question, as [$sgqa] = $value
* 'sumEqn' => '' //
* 'sumRemainingEqn' => '' //
* );
*
* @var type
*/
private $currentQset=NULL;
/**
* last result of NavigateForwards, NavigateBackwards, or JumpTo
* Array of status information about last movement, whether at question, group, or survey level
*
* @example = array(
* 'finished' => 0 // 1 if the survey has been completed and needs to be finalized
* 'message' => '' // any error message that needs to be displayed
* 'seq' => 1 // the sequence count, using gseq, or qseq units if in 'group' or 'question' mode, respectively
* 'mandViolation' => 0 // whether there was any violation of mandatory constraints in the last movement
* 'valid' => 0 // 1 if the last movement passed all validation constraints. 0 if there were any validation errors
* 'unansweredSQs' => // pipe-separated list of any sub-questions that were not answered
* 'invalidSQs' => // pipe-separated list of any sub-questions that failed validation constraints
* );
*
* @var type
*/
private $lastMoveResult=NULL;
/**
* array of information needed to generate navigation index in question-by-question mode
* One entry for each question, indexed by qseq
*
* @example [4] = array(
* 'qid' => "700" // the question id
* 'qtext' => 'How old are you?' // the question text
* 'qcode' => 'age' // the variable name
* 'qhelp' => '' // the help text
* 'anyUnanswered' => 0 // 1 if there are any sub-questions answered. Used for index display
* 'anyErrors' => 0 // 1 if there are any errors among the sub-questions. Could be used for index display
* 'show' => 1 // 1 if there are any relevant, non-hidden sub-questions. Only if so, then display the index entry
* 'gseq' => 0 // the group sequence
* 'gtext' => // text description for the group
* 'gname' => 'G1' // the group title
* 'gid' => "34" // the group id
* 'mandViolation' => 0 // 1 if the question as a whole fails the mandatory criteria
* 'valid' => 1 // 0 if any part of the question fails validation criteria.
* );
*
* @var type
*/
private $indexQseq;
/**
* array of information needed to generate navigation index in group-by-group mode
* One entry for each group, indexed by gseq
*
* @example [0] = array(
* 'gtext' => // the description for the group
* 'gname' => 'G1' // the group title
* 'gid' => '34' // the group id
* 'anyUnanswered' => 0 // 1 if any questions within the group are unanswered
* 'anyErrors' => 0 // 1 if any of the questions within the group fail either validity or mandatory constraints
* 'valid' => 1 // 1 if at least question in the group is relevant and non-hidden
* 'mandViolation' => 0 // 1 if at least one relevant, non-hidden question in the group fails mandatory constraints
* 'show' => 1 // 1 if there is at least one relevant, non-hidden question within the group
* );
*
* @var type
*/
private $indexGseq;
/**
* array of group sequence number to static info
* One entry per group, indexed on gseq
*
* @example [0] = array(
* 'group_order' => 0 // gseq
* 'gid' => "34" // group id
* 'group_name' => 'G2' // the group title
* 'description' => // the description of the group (e.g. gtitle)
* 'grelevance' => '' // the group-level relevance
* );
*
* @var type
*/
private $gseq2info;
/**
* the maximum groupSeq reached - this is needed for Index
* @var type
*/
private $maxGroupSeq;
/**
* mapping of questions to information about their subquestions.
* One entry per question, indexed on qid
*
* @example [702] = array(
* 'qid' => 702 // the question id
* 'qseq' => 6 // the question sequence
* 'gseq' => 0 // the group sequence
* 'sgqa' => '26626X34X702' // the root of the SGQA code (reallly just the SGQ)
* 'varName' => 'afSrcFilter_sq1' // the full qcode variable name - note, if there are sub-questions, don't use this one.
* 'type' => 'M' // the one-letter question type
* 'fieldname' => '26626X34X702sq1' // the fieldname (used as JavaScript variable name, and also as database column name
* 'rootVarName' => 'afDS' // the root variable name
* 'preg' => '/[A-Z]+/' // regular expression validation equation, if any
* 'subqs' => array() of sub-questions, where each contains:
* 'rowdivid' => '26626X34X702sq1' // the javascript id identifying the question row (so array_filter can hide rows)
* 'varName' => 'afSrcFilter_sq1' // the full variable name for the sub-question
* 'jsVarName_on' => 'java26626X34X702sq1' // the JavaScript variable name if the variable is defined on the current page
* 'jsVarName' => 'java26626X34X702sq1' // the JavaScript variable name to use if the variable is defined on a different page
* 'csuffix' => 'sq1' // the SGQ suffix to use for a fieldname
* 'sqsuffix' => '_sq1' // the suffix to use for a qcode variable name
* );
*
* @var type
*/
private $q2subqInfo;
/**
* array of advanced question attributes for each question
* Indexed by qid; available for all quetions
*
* @example [784] = array(
* 'array_filter_exclude' => 'afSrcFilter'
* 'exclude_all_others' => 'sq5'
* 'max_answers' => '3'
* 'min_answers' => '1'
* 'other_replace_text' => '{afSrcFilter_other}'
* );
*
* @var type
*/
private $qattr;
/**
* list of needed sub-question relevance (e.g. array_filter)
* Indexed by qid then sgqa; only generated for current group of questions
*
* @example [708][26626X37X708sq2] = array(
* 'qid' => '708' // the question id
* 'eqn' => "((26626X34X702sq2 != ''))" // the auto-generated sub-question-level relevance equation
* 'prettyPrintEqn' => '' // only generated if there errors - shows syntax highlighting of them
* 'result' => 0 // result of processing the sub-question-level relevance equation in the current context
* 'numJsVars' => 1 // the number of on-page javascript variables in 'eqn'
* 'relevancejs' => // the generated javascript from 'eqn' -- e.g. "LEMif(LEManyNA('26626X34X702sq2'),'',(((LEMval('26626X34X702sq2') != ""))))"
* 'relevanceVars' => "java26626X34X702sq2" // the pipe-separated list of on-page javascript variables in 'eqn'
* 'rowdivid' => "26626X37X708sq2" // the javascript id of the question row (so can apply array_filter)
* 'type' => 'array_filter' // semicolon delimited list of types of subquestion relevance filters applied
* 'qtype' => 'A' // the single character question type
* 'sgqa' => "26626X37X708" // the SGQ portion of the fieldname
* 'hasErrors' => 0 // 1 if there are any parse errors in the sub-question validation equations
* );
*
* @var type
*/
private $subQrelInfo=array();
/**
* array of Group-level relevance status
* Indexed by gseq; only shows groups that have been visited
*
* @example [1] = array(
* 'gseq' => 1 // group sequence
* 'eqn' => '' // the group-level relevance
* 'result' => 1 // result of processing the group-level relevance
* 'numJsVars' => 0 // the number of on-page javascript variables in the group-level relevance equation
* 'relevancejs' => '' // the javascript version of the relevance equation
* 'relevanceVars' => '' // the pipe-delimited list of on-page javascript variable names used within the group-level relevance equation
* 'prettyPrint' => '' // a pretty-print version of the group-level relevance equation, only if there are errors
* );
*
* @var type
*/
private $gRelInfo=array();
/**
* Array of timing information to debug how long it takes for portions of LEM to run.
* Array of timing information (in seconds) for EM to help with debugging
*
* @example [1] = array(
* [0]="LimeExpressionManager::NavigateForwards"
* [1]=1.7079849243164
* );
*
* @var type
*/
private $runtimeTimings=array();
/**
* True (1) if calling LimeExpressionManager functions between StartSurvey and FinishProcessingPage
* Used (mostly deprecated) to detect calls to LEM which happen outside of the normal processing scope
* @var Boolean
*/
private $initialized=false;
/**
* True (1) if have already processed the relevance equations (so don't need to do it again)
*
* @var Boolean
*/
private $processedRelevance=false;
/**
* Message generated to show debug timing values, if debugLevel includes LEM_DEBUG_TIMING
* @var type
*/
private $debugTimingMsg='';
/**
* temporary variable to reduce need to parse same equation multiple times. Used for relevance and validation
* Array, indexed on equation, providing the following information:
*
* @example ['!is_empty(num)'] = array(
* 'result' => 1 // result of processing the equation in the current scope
* 'prettyPrint' => '' // syntax-highlighted version of equation if there are any errors
* 'hasErrors' => 0 // 1 if there are any syntax errors
* );
*
* @var type
*/
private $ParseResultCache;
/**
* array of 2nd scale answer lists for types ':' and ';' -- needed for convenient print of logic file
* Indexed on qid; available for all questions
*
* @example [706] = array(
* '1~1' => '1|Never',
* '1~2' => '2|Sometimes',
* '1~3' => '3|Always'
* );
*
* @var type
*/
private $multiflexiAnswers;
/**
* used to specify whether to generate equations using SGQA codes or qcodes
* Default is to convert all qcode naming to sgqa naming when generating javascript, as that provides the greatest backwards compatibility
* TSV export of survey structure sets this to false so as to force use of qcode naming
*
* @var Boolean
*/
private $sgqaNaming = true;
/**
* Number of groups in survey (number of possible pages to display)
* @var integer
*/
private $numGroups=0;
/**
* Numer of questions in survey (counting display-only ones?)
* @var integer
*/
private $numQuestions=0;
/**
* String identifier for the active session
* @var type
*/
private $sessid;
/**
* Linked list of array filters
* @var array
*/
private $qrootVarName2arrayFilter = array();
/**
* Array, keyed on qid, to JavaScript and list of variables needed to implement exclude_all_others_auto
* @var type
*/
private $qid2exclusiveAuto = array();
/**
* Array of values to be updated
* @var type
*/
private $updatedValues = array();
/**
* A private constructor; prevents direct creation of object
*/
private function __construct()
{
self::$instance =& $this;
$this->em = new ExpressionManager();
if (!isset($_SESSION['LEMlang'])) {
$_SESSION['LEMlang'] = 'en'; // so that there is a default
}
}
/**
* Ensures there is only one instances of LEM. Note, if switch between surveys, have to clear this cache
* @return LimeExpressionManager
*/
public static function &singleton()
{
$now = microtime(true);
if (isset($_SESSION['LEMdirtyFlag'])) {
$c = __CLASS__;
self::$instance = new $c;
unset($_SESSION['LEMdirtyFlag']);
}
else if (!isset(self::$instance)) {
if (isset($_SESSION['LEMsingleton'])) {
self::$instance = unserialize($_SESSION['LEMsingleton']);
}
else {
$c = __CLASS__;
self::$instance = new $c;
}
}
else {
// does exist, and OK to cache
return self::$instance;
}
// only record duration if have to create new (or unserialize) an instance
self::$instance->runtimeTimings[] = array(__METHOD__,(microtime(true) - $now));
return self::$instance;
}
/**
* Prevent users to clone the instance
*/
public function __clone()
{
trigger_error('Clone is not allowed.', E_USER_ERROR);
}
/**
* Set the previewmode
*/
public static function SetPreviewMode($previewmode=false)
{
$LEM =& LimeExpressionManager::singleton();
$LEM->sPreviewMode=$previewmode;
//$_SESSION[$LEM->sessid]['previewmode']=$previewmode;
}
/**
* Tells Expression Manager that something has changed enough that needs to eliminate internal caching
*/
public static function SetDirtyFlag()
{
$_SESSION['LEMdirtyFlag'] = true;
$_SESSION['LEMforceRefresh'] = true;
}
/**
* Set the SurveyId - really checks whether the survey you're about to work with is new, and if so, clears the LEM cache
* @param <integer> $sid
*/
public static function SetSurveyId($sid=NULL)
{
if (!is_null($sid)) {
if (isset($_SESSION['LEMsid']) && $sid != $_SESSION['LEMsid']) {
// then trying to use a new survey - so clear the LEM cache
self::SetDirtyFlag();
}
$_SESSION['LEMsid'] = $sid;
}
}
/**
* Sets the language for Expression Manager. If the language has changed, then EM cache must be invalidated and refreshed
* @param <string> $lang
*/
public static function SetEMLanguage($lang=NULL)
{
if (is_null($lang)) {
return; // should never happen
}
if (!isset($_SESSION['LEMlang'])) {
$_SESSION['LEMlang'] = $lang;
}
if ($_SESSION['LEMlang'] != $lang) {
// then changing languages, so clear cache
self::SetDirtyFlag();
}
$_SESSION['LEMlang'] = $lang;
}
/**
* Do bulk-update/save of Condition to Relevance
* @param <integer> $surveyId - if NULL, processes the entire database, otherwise just the specified survey
* @param <integer> $qid - if specified, just updates that one question
* @return array of query strings
*/
public static function UpgradeConditionsToRelevance($surveyId=NULL, $qid=NULL)
{
LimeExpressionManager::SetDirtyFlag(); // set dirty flag even if not conditions, since must have had a DB change
// Cheat and upgrade question attributes here too.
self::UpgradeQuestionAttributes(true,$surveyId,$qid);
$releqns = self::ConvertConditionsToRelevance($surveyId,$qid);
$num = count($releqns);
if ($num == 0) {
return NULL;
}
$queries = array();
foreach ($releqns as $key=>$value) {
$query = "UPDATE {{questions}} SET relevance=".Yii::app()->db->quoteValue($value)." WHERE qid=".$key;
dbExecuteAssoc($query);
$queries[] = $query;
}
LimeExpressionManager::SetDirtyFlag();
return $queries;
}
/**
* This reverses UpgradeConditionsToRelevance(). It removes Relevance for questions that have Condition
* @param <integer> $surveyId
* @param <integer> $qid
*/
public static function RevertUpgradeConditionsToRelevance($surveyId=NULL, $qid=NULL)
{
LimeExpressionManager::SetDirtyFlag(); // set dirty flag even if not conditions, since must have had a DB change
$releqns = self::ConvertConditionsToRelevance($surveyId,$qid);
$num = count($releqns);
if ($num == 0) {
return NULL;
}
foreach ($releqns as $key=>$value) {
$query = "UPDATE {{questions}} SET relevance=1 WHERE qid=".$key;
dbExecuteAssoc($query);
}
return count($releqns);
}
/**
* If $qid is set, returns the relevance equation generated from conditions (or NULL if there are no conditions for that $qid)
* If $qid is NULL, returns an array of relevance equations generated from Condition, keyed on the question ID
* @param <integer> $surveyId
* @param <integer> $qid - if passed, only generates relevance equation for that question - otherwise genereates for all questions with conditions
* @return array of generated relevance strings, indexed by $qid
*/
public static function ConvertConditionsToRelevance($surveyId=NULL, $qid=NULL)
{
$query = LimeExpressionManager::getConditionsForEM($surveyId,$qid);
$_qid = -1;
$relevanceEqns = array();
$scenarios = array();
$relAndList = array();
$relOrList = array();
foreach($query->readAll() as $row)
{
$row['method']=trim($row['method']); //For Postgres
if ($row['qid'] != $_qid)
{
// output the values for prior question is there was one
if ($_qid != -1)
{
if (count($relOrList) > 0)
{
$relAndList[] = '(' . implode(' or ', $relOrList) . ')';
}
if (count($relAndList) > 0)
{
$scenarios[] = '(' . implode(' and ', $relAndList) . ')';
}
$relevanceEqn = implode(' or ', $scenarios);
$relevanceEqns[$_qid] = $relevanceEqn;
}
// clear for next question
$_qid = $row['qid'];
$_scenario = $row['scenario'];
$_cqid = $row['cqid'];
$_subqid = -1;
$relAndList = array();
$relOrList = array();
$scenarios = array();
$releqn = '';
}
if ($row['scenario'] != $_scenario)
{
if (count($relOrList) > 0)
{
$relAndList[] = '(' . implode(' or ', $relOrList) . ')';
}
$scenarios[] = '(' . implode(' and ', $relAndList) . ')';
$relAndList = array();
$relOrList = array();
$_scenario = $row['scenario'];
$_cqid = $row['cqid'];
$_subqid = -1;
}
if ($row['cqid'] != $_cqid)
{
$relAndList[] = '(' . implode(' or ', $relOrList) . ')';
$relOrList = array();
$_cqid = $row['cqid'];
$_subqid = -1;
}
// fix fieldnames
if ($row['type'] == '' && preg_match('/^{.+}$/',$row['cfieldname'])) {
$fieldname = substr($row['cfieldname'],1,-1); // {TOKEN:xxxx}
$subqid = $fieldname;
$value = $row['value'];
}
else if ($row['type'] == 'M' || $row['type'] == 'P') {
if (substr($row['cfieldname'],0,1) == '+') {
// if prefixed with +, then a fully resolved name
$fieldname = substr($row['cfieldname'],1) . '.NAOK';
$subqid = $fieldname;
$value = $row['value'];
}
else {
// else create name by concatenating two parts together
$fieldname = $row['cfieldname'] . $row['value'] . '.NAOK';
$subqid = $row['cfieldname'];
$value = 'Y';
}
}
else {
$fieldname = $row['cfieldname'] . '.NAOK';
$subqid = $fieldname;
$value = $row['value'];
}
if ($_subqid != -1 && $_subqid != $subqid)
{
$relAndList[] = '(' . implode(' or ', $relOrList) . ')';
$relOrList = array();
}
$_subqid = $subqid;
// fix values
if (preg_match('/^@\d+X\d+X\d+.*@$/',$value)) {
$value = substr($value,1,-1);
}
else if (preg_match('/^{.+}$/',$value)) {
$value = substr($value,1,-1);
}
else if ($row['method'] == 'RX') {
if (!preg_match('#^/.*/$#',$value))
{
$value = '"/' . $value . '/"'; // if not surrounded by slashes, add them.
}
}
else {
$value = '"' . $value . '"';
}
// add equation
if ($row['method'] == 'RX')
{
$relOrList[] = "regexMatch(" . $value . "," . $fieldname . ")";
}
else
{
// Condition uses ' ' to mean not answered, but internally it is really stored as ''. Fix this
if ($value === '" "' || $value == '""') {
if ($row['method'] == '==')
{
$relOrList[] = "is_empty(" . $fieldname . ")";
}
else if ($row['method'] == '!=')
{
$relOrList[] = "!is_empty(" . $fieldname . ")";
}
else
{
$relOrList[] = $fieldname . " " . $row['method'] . " " . $value;
}
}
else
{
if ($value == '"0"' || !preg_match('/^".+"$/',$value))
{
switch ($row['method'])
{
case '==':
case '<':
case '<=':
case '>=':
$relOrList[] = '(!is_empty(' . $fieldname . ') && (' . $fieldname . " " . $row['method'] . " " . $value . '))';
break;
case '!=':
$relOrList[] = '(is_empty(' . $fieldname . ') || (' . $fieldname . " != " . $value . '))';
break;
default:
$relOrList[] = $fieldname . " " . $row['method'] . " " . $value;
break;
}
}
else
{
switch ($row['method'])
{
case '<':
case '<=':
$relOrList[] = '(!is_empty(' . $fieldname . ') && (' . $fieldname . " " . $row['method'] . " " . $value . '))';
break;
default:
$relOrList[] = $fieldname . " " . $row['method'] . " " . $value;
break;
}
}
}
}
if ($row['cqid'] == 0 || substr($row['cfieldname'],0,1) == '+') {
$_cqid = -1; // forces this statement to be ANDed instead of being part of a cqid OR group
}
}
// output last one
if ($_qid != -1)
{
if (count($relOrList) > 0)
{
$relAndList[] = '(' . implode(' or ', $relOrList) . ')';
}
if (count($relAndList) > 0)
{
$scenarios[] = '(' . implode(' and ', $relAndList) . ')';
}
$relevanceEqn = implode(' or ', $scenarios);
$relevanceEqns[$_qid] = $relevanceEqn;
}
if (is_null($qid)) {
return $relevanceEqns;
}
else {
if (isset($relevanceEqns[$qid]))
{
$result = array();
$result[$qid] = $relevanceEqns[$qid];
return $result;
}
else
{
return NULL;
}