Parse csv strings per RFC 4180

csv.js

class CSV{
	constructor(data, has_header){
		this.has_header = has_header;
		this.headers = [];
		this.rows = [];
		this.headers = [];
		
		this.raw = data;
		this._iterator = 0;
		this._in_quote = false;
		this._char = false;
		this.current_col = [];
		this.current_row = [];
	}
	
	getNextChar(){
		if(this._iterator >= this.raw.length) return false;
		this._char = this.raw.charAt(this._iterator);
		this._iterator++;
		return true;
	}
	
	checkQuote(){
		if(this._char !== '"') return;
		this._in_quote = !this._in_quote;
	}
	
	parseColumn(){
		var val = this.current_col.join('').trim();
		if(val.charAt(0)==='"' && val.charAt(val.length-1) === '"'){
			val = val.substring(1, val.length-2).replace(/""/g, '');
		}
		this.current_row.push(val);
		this.current_col = []
	}
	
	checkComma(){
		if(this._char === ',' && !this._in_quote){
			this.parseColumn();
			return false;
		}
	}
	
	checkLnBr(){
		if(this._char === "\n" && !this._in_quote){
			this.parseColumn();
			this.rows.push(this.current_row);
			this.current_row = [];
			return false;
		}
	}
	
	parse(){
		while(this.getNextChar()){
			if(false === this.checkQuote()) continue;
			if(false === this.checkComma()) continue;
			if(false === this.checkLnBr()) continue;
			this.current_col.push(this._char);
		}
		if(this.has_header) this.headers = this.rows.shift();
		this.formatData();
		return this.rows;
	}
	
	formatData(){
		if(!this.has_header) return;
		var ret = [];
		for(var i=0; i<this.rows.length; i++){
			var row = {};
			for(var n=0; n<this.rows[i].length; n++){
				var header = this.headers[n] || n;
				row[header] = this.rows[i][n];
			}
			ret.push(row);
		}
		this.rows = ret;
	}
}

(async ()=>{
  const raw = await fetch('logs.csv').then(r=>r.text());
  const csv = new CSV(raw, true);
  var data = csv.parse();
  console.log(data);
})();