void CheckForSharp(AdjacencyListReader listReader)
{
var line = listReader.ReadNextLine();
if (line != "#")
{
throw new ParserException("Parsing .txt file error.\n" + $"Wrong file format, no sharp in line: {listReader.CurrentLineIndex}. ");
}
}
/// <summary>
/// Creates adjacency list of graph using
/// text file.
/// </summary>
/// <param name="filePath">File path.</param>
/// <returns>Adjacency list.</returns>
public int[][] ReadAdjacencyListFromFile(string filePath)
{
List <int>[] adjacencyList;
using (var listReader = new AdjacencyListReader(filePath)) {
SetAmoutOfVertex(listReader);
CheckForSharp(listReader);
adjacencyList = ReadAdjacencyListWith(listReader);
CheckForSharp(listReader);
}
return(Proceed(adjacencyList));
}
void SetAmoutOfVertex(AdjacencyListReader listReader)
{
var line = listReader.ReadNextLine();
var readResult = int.TryParse(line, out int verdsNumber);
if (readResult == false || verdsNumber < 1)
{
throw new ParserException("Parsing .txt file error.\n" + $"Invalid amount of verds, line: {listReader.CurrentLineIndex}.");
}
listReader.AmoutOfVertex = verdsNumber;
}
public int[][] ReadAdjacencyListFromFile(string filePath)
{
List <int>[] adjacencyList = null;
using (var reader = new AdjacencyListReader(filePath)) {
try {
reader.AmoutOfVertex = GetAmountOfVertices(filePath);
adjacencyList = CreateAdjacencyList(reader);
} catch {
throw new ParserException("Parsing .edg file error.\n" + $"Error in line {reader.CurrentLineIndex + 1}");
}
}
return(Proceed(adjacencyList));
}
static List <int>[] CreateAdjacencyList(AdjacencyListReader reader)
{
var adjacencyList = new List <int> [reader.AmoutOfVertex];
for (int i = 0; i < adjacencyList.Length; i++)
{
adjacencyList[i] = new List <int>();
}
var firstLine = reader.ReadNextLine();
var splittedFirstLine = firstLine.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
var n = int.Parse(splittedFirstLine[0]);
for (int i = 0; i < n; i++)
{
var line = reader.ReadNextLine();
var splitedLine = line.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
var u = int.Parse(splitedLine[0]) - 100;
var v = int.Parse(splitedLine[1]) - 100;
adjacencyList[u].Add(v);
}
return(adjacencyList);
}
List <int>[] ReadAdjacencyListWith(AdjacencyListReader listReader)
{
var adjacencyList = new List <int> [listReader.AmoutOfVertex];
var separator = "->";
for (int i = 0; i < adjacencyList.Length; i++)
{
adjacencyList[i] = new List <int>();
var line = listReader.ReadNextLine();
if (line == null)
{
throw new ParserException("Parsing .txt file error.\n" + $"Wrong file format, empty line {listReader.CurrentLineIndex}.");
}
else if (line == "#")
{
throw new ParserException("Parsing .txt file error.\n" + $"Invalid amount of verds line {listReader.CurrentLineIndex}.");
}
var indexOfSeparator = line.IndexOf(separator);
var lastIndexOfSeparator = line.LastIndexOf(separator);
if (indexOfSeparator != lastIndexOfSeparator)
{
throw new ParserException("Parsing .txt file error.\n" + $"Wrong format, more than 1 arrow in line: {listReader.CurrentLineIndex}. ");
}
if (indexOfSeparator == 0)
{
throw new ParserException("Parsing .txt file error.\n" + $"No verd's value in line: {listReader.CurrentLineIndex}. ");
}
else if (indexOfSeparator == -1)
{
throw new ParserException("Parsing .txt file error.\n" + $"Wrong format, no arrow in line: {listReader.CurrentLineIndex}. ");
}
var splitedLine = line.Split(new string[] { separator }, StringSplitOptions.RemoveEmptyEntries);
Array.ForEach(splitedLine, x => x.Trim());
if (splitedLine.Length > 2)
{
throw new ParserException("Parsing .txt file error.\n" + $"Wrong format, more than 1 arrow in line: {listReader.CurrentLineIndex}. ");
}
else if (splitedLine[0] == "")
{
throw new ParserException("Parsing .txt file error.\n" + $"No verd's value in line: {listReader.CurrentLineIndex}. ");
}
var verd = ReadIntFromString(splitedLine[0], listReader.CurrentLineIndex);
if (verd != i)
{
throw new ParserException("Parsing .txt file error.\n" + $"Invalid verd's order, they should be ordered by ascending in line: {listReader.CurrentLineIndex}. ");
}
if (splitedLine.Length == 2)
{
// Parsing line after arrow sign.
var secondLine = splitedLine[1];
if (secondLine != "")
{
var verdsLine = secondLine.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
if (verdsLine.Length != 0)
{
for (int j = 0; j < verdsLine.Length; j++)
{
int v = ReadIntFromString(verdsLine[j], listReader.CurrentLineIndex);
if (v > adjacencyList.Length - 1)
{
throw new ParserException("Parsing .txt file error.\n" + $"Invalid value of the verd in line: {listReader.CurrentLineIndex}.");
}
adjacencyList[i].Add(v);
}
}
}
}
}
return(adjacencyList);
}
