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fix(Scraper): crash on empty node list #151

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Merged
angeousta merged 1 commit into from
Oct 3, 2023
Merged

fix(Scraper): crash on empty node list #151

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11 changes: 10 additions & 1 deletion PoliNetwork.Graduatorie.Scraper/Utils/Web/Scraper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,10 @@ private IEnumerable<string> ScrapeHomepage()
{
HashSet<string> links = new();
var page = _web.Load(HomepageUrl).DocumentNode;

var slides = page.SelectNodes("//section[@id='copertina']//div[contains(@class, 'sp-slides')]/div");
if (slides == null) return links;

foreach (var slide in slides)
{
var h1 = slide.Descendants("h1");
Expand All @@ -61,8 +64,11 @@ private IEnumerable<string> ScrapeFuturiStudenti()
{
HashSet<string> links = new();
var page = _web.Load(FuturiStudentiUrl).DocumentNode;

var slides =
page.SelectNodes("//section[@id='newsNoThumb' or @id='news']//div[contains(@class, 'sp-slides')]/div");
if (slides == null) return links;

foreach (var slide in slides)
{
var h1 = slide.Descendants("h1");
Expand All @@ -88,7 +94,10 @@ private IEnumerable<string> ScrapeInEvidenza()
{
HashSet<string> links = new();
var page = _web.Load(InEvidenzaUrl).DocumentNode;

var liTags = page.SelectNodes("//div[@id='content']//li");
if (liTags == null) return links;

foreach (var li in liTags)
{
var h3 = li.GetElementsByTagName("h3");
Expand Down Expand Up @@ -181,4 +190,4 @@ private bool IsValidText(string text)
return null;
}
}
}
}