SubststitutionHelper.js

var SubststitutionHelper = Class.create();
SubststitutionHelper.prototype = {
    initialize: function(record) {
    	this.log = new GSLog("intuit.custom.debug.level", this.type);
    	this.record = record;
    	// preload variables for request item
    	this.variables = {};
    	if(this.record.getTableName() == 'sc_req_item'){
    		this.preloadVariables();
    	}
    },
    substitute:function(strBody){
    	// evalauate and return javascript script result
    	if(strBody.substring(0, 11) == this.JAVASCRIPT_PREFIX){
    		var script = strBody.substring(11);
    		this.log.logDebug("inside javascript evaluation -- " + script);
    		var scriptResult = "";
    		try{
    			scriptResult = GlideController.evaluateString(script);
    			this.log.logDebug("scriptResult -  " + scriptResult);
    		}catch(e){
    			this.log.logDebug("error executing the script - " + e.toString());
    		}
    		return scriptResult;
    	}
    	// Tokens could be field name or to display display value of field then 
    	// prefix it with dv_ : dv_fieldName
    	// fieldnames are enclosed inside currly braces {dv_fieldName}
    	var tokens = strBody.match(/[^{}]+(?=\})/g);
    	if(!tokens){
    		return strBody;
    	}
    	var objToken = {};	
    	// convert array to object
    	for (var i = tokens.length - 1; i >= 0; i--) {
    		objToken[tokens[i].toString()] = "";
    	};

        // iterate over the token object and get values from this.record
        for(var key in objToken){
        	
        	var keyValue = "";
        	// check if to display Variable value or field value or display value
        	if(key.substring(0, 10) == this.VARIABLE_PREFIX){
        		var variableName = key.substring(10);
        		keyValue = this.variables[variableName];
        	}
        	else if (key.substring(0, 3) == this.DISPLAY_VALUE_PREFIX) {
        		var displayKey = key.substring(3);
        		keyValue = this.record.getDisplayValue(displayKey);
        	}else{
        		keyValue = this.record.getValue(key);
        	}
        	objToken[key] = keyValue;
        	// find and replace the tokens
        	var re = new RegExp('\{' + key + '\\}', 'g');
        	strBody = strBody.replace(re, keyValue);
        }

        return strBody;
    },
    preloadVariables:function(){
    	// Preload variables in this.variables global object
    	var set = new GlideappVariablePoolQuestionSet();
    	set.setRequestID(this.record.getUniqueValue());
		set.load();
		var al = set.getFlatQuestions();
		for (var i=0; i < al.size(); i++) {
			var question = al.get(i);
			var variableName = question.getName().toString();
			var variableValue = question.getValue().toString();
			var variableDisplayValue = question.getDisplayValue().toString();
			this.variables[variableName] = variableValue;
			this.variables[this.DISPLAY_VALUE_PREFIX + variableName] = variableDisplayValue;
		}
    },
    type: 'SubststitutionHelper',
    VARIABLE_PREFIX : 'variables.',
    JAVASCRIPT_PREFIX : 'javascript:',
    DISPLAY_VALUE_PREFIX : 'dv_'
};