tracer.js

/*!
 * sqlite-parser - v1.0.1
 * @copyright 2015-2019 Code School (http://codeschool.com)
 * @author Nick Wronski <nick@javascript.com>
 */
'use strict';Object.defineProperty(exports,"__esModule",{value:true});function findLastIndex(arr,func){for(var i=arr.length-1;i>=0;i-=1){if(func(arr[i])){return i;}}return-1;}function takeWhile(arr,func){var len=arr.length;var i=0;for(;i<len;i+=1){if(!func(arr[i])){return arr.slice(0,i);}}return arr;}var Tracer=exports.Tracer=function(){function Tracer(){if(!(this instanceof Tracer)){return new Tracer();}this.events=[];this.indentation=0;this.whitespaceRule=/(^whitespace)|(char$)|(^[oe]$)|(^sym\_)/i;this.statementRule=/Statement$/i;this.firstNodeRule=/(Statement|Clause)$/i;};Tracer.prototype.trace=function trace(event){var that=this,lastIndex,lastWsIndex;event.indentation=this.indentation;switch(event.type){case'rule.enter':this.events.push(event);this.indentation+=1;break;case'rule.match':this.indentation-=1;break;case'rule.fail':lastIndex=findLastIndex(this.events,function(_ref){var rule=_ref.rule;return rule===event.rule;});lastWsIndex=findLastIndex(this.events,function(e){return!that.whitespaceRule.test(e.rule);});if(that.whitespaceRule.test(event.rule)||lastIndex===lastWsIndex){this.events.splice(lastIndex,1);}this.indentation-=1;break;}};Tracer.prototype.smartError=function smartError(err){var that=this,message,location,chain,chainDetail,firstNode,bestNode={indentation:-1},deep=false,stmts=0,namedEvents=this.events.filter(function(e){return e.description!=null&&!that.whitespaceRule.test(e.rule);}).reverse();chain=takeWhile(namedEvents,function(elem){if(/^(sym\_semi)$/i.test(elem.rule)){stmts+=1;}if(stmts>1){return false;}if(!deep){if(elem.indentation>bestNode.indentation){bestNode=elem;}else{deep=true;}}else if(/^(stmt)$/i.test(elem.rule)){deep=true;return true;}return true;});if(chain.length){location=bestNode.location;firstNode=chain.find(function(elem){return that.firstNodeRule.test(elem.description)&&elem.description!==bestNode.description&&elem.indentation!==bestNode.indentation;});if(firstNode!=null){if(this.statementRule.test(bestNode.description)&&this.statementRule.test(firstNode.description)){chainDetail=firstNode.description;}else{chainDetail=bestNode.description+' ('+firstNode.description+')';}}else{chainDetail=bestNode.description;}message='Syntax error found near '+chainDetail;Object.assign(err,{'message':message,'location':location});}return err;};return Tracer;}();