WebsiteParser
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Simple library which parses web pages into objects usin attributes
Website parser
Website was created to make web scraping / web harvesing easier.
Instead of creating methods / classes with extracting logic, you can describe your properties using attributes.
Extracting is done mostly using CSS selectors so this library is not resistant to website changes.
Nuget
PM> Install-Package WebsiteParser -Version 1.1.3
https://www.nuget.org/packages/WebsiteParser/1.1.3
Patch notes 1.1.3
- DebugAttribute fix
Usage
Parsing:
string html;
// ...
UserInfo johnInfo = WebContentParser.Parse<UserInfo>(html);
Model class:
class UserInfo
{
[Selector("#personName")]
public string Name { get; set; }
[Selector("#personBirdthDate")]
[Converter(typeof(DateTimeConverter))]
public DateTime BirdthDate { get; set; }
[Selector("#personAbout")]
[Regex("about me: (.*)")]
public string Description { get; set; }
}
Input data:
<html>
<body>
<div id="personName">John</div>
<div id="personBirdthDate">23-10-2000</div>
<div id="personAbout">about me: lorem ipsum dolor sit amet</div>
</body>
</html>
Lists
For parsing lists use ListSelectorAttribute which should be used on model class.
Constructor's argument "selector" is parent of children which should be parsed.
ChildSelector property is used to choose which try to parse.
Example:
Parsing:
string html;
// ...
IEnumerable<UserInfo> people = WebContentParser.ParseList<UserInfo>(html);
Model class:
[ListSelector("people", ChildSelector = ".person")]
class UserInfo
{
[Selector("#personName")]
public string Name { get; set; }
[Selector("#personBirdthDate")]
[Converter(typeof(DateTimeConverter))]
public DateTime BirdthDate { get; set; }
[Selector("#personAbout")]
[Regex("about me: (.*)")]
public string Description { get; set; }
}
Input data:
<html>
<body>
<div id="people">
<div class="person">
<div id="personName">John</div>
<div id="personBirdthDate">19-01-2038</div>
<div id="personAbout">about me: lorem ipsum dolor sit amet</div>
</div>
<div class="person">
<div id="personName">Joe</div>
<div id="personBirdthDate">01-01-1970</div>
<div id="personAbout">about me: hello world</div>
</div>
</div>
</body>
</html>
Attributes
Attributes are handled in same order they were added e.g.
[Selector("#addDate")]
[Remove("Add date: ", RemoverValueType.Text)]
[Converter(typeof(DateTimeConverter))]
public DateTime AddDate { get; set; }
Selector will extract markup's text as string, Remove will change received string and pass it to Converter, which will change string's type to DateTime. At the end value of type DateTime will be set in the AddDate property.
There are two types of attributes:
- Start attributes, which can be only added at the beginning.
- Parser attributes, which will modify and pass result to next attribute or set to property.
Read more about attributes in Wiki
Creating custom attribute
You can create your own parser attribute simply implementing WebsiteParser.Attributes.Abstract.IParserAttribute interface. Keep in mind that input type depends on above attribute's output.
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