JSoup: get wikipedia page summary












0















I used MediaWiki API to get a wikipedia page, after getting html content I tried using 



p:not(h2 ~ p)


to get page summary paragraphs, it should be paragraphs before table of contents element, it gets the wanted part but has additional paragraphs, where is the problem ?






html css-selectors jsoup







share|improve this question





























    0















    I used MediaWiki API to get a wikipedia page, after getting html content I tried using 



    p:not(h2 ~ p)


    to get page summary paragraphs, it should be paragraphs before table of contents element, it gets the wanted part but has additional paragraphs, where is the problem ?






    html css-selectors jsoup







    share|improve this question



























      0












      0








      0








      I used MediaWiki API to get a wikipedia page, after getting html content I tried using 



      p:not(h2 ~ p)


      to get page summary paragraphs, it should be paragraphs before table of contents element, it gets the wanted part but has additional paragraphs, where is the problem ?






      html css-selectors jsoup







      share|improve this question
















      I used MediaWiki API to get a wikipedia page, after getting html content I tried using 



      p:not(h2 ~ p)


      to get page summary paragraphs, it should be paragraphs before table of contents element, it gets the wanted part but has additional paragraphs, where is the problem ?






      html css-selectors jsoup




      html css-selectors jsoup






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 24 '18 at 14:27







      Amr Lotfy

















      asked Nov 23 '18 at 2:23









      Amr LotfyAmr Lotfy

      1,52121534




      1,52121534
























          2 Answers
          2






          active

          oldest

          votes


















          1














          p:not(h2 ~ p) gets every single paragraph on the page that doesn't have h2 before it in the same parent. This includes nested paragraphs, paragraphs outside the main content altogether, etc, because none of those paragraphs share the same parent element as h2 itself. You don't want those; you only want the paragraphs that appear just before h2 elements within their parent element.



          For that, you want to anchor the outer p selector to the parent element. The parent element you want is .mw-parser-output:



          .mw-parser-output > p:not(h2 ~ p)





          share|improve this answer


























          • After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

            – Amr Lotfy
            Nov 24 '18 at 14:34





















          1














          Code:



          public static void main(String args){
          
    Document doc = null;
          
    String url = "https://en.wikipedia.org/wiki/Nico_Ditch";
          
    try {
          
        doc = Jsoup.parse(new URL(url).openStream(), "UTF-8", url);
          
    } catch (IOException e) {
          
        e.printStackTrace();
          
    }
          

          
    Elements els = doc.select(".mw-parser-output > p:not(h2 ~ p)");
          
    System.out.println(els);
          
    // System.out.println(doc);
          
}


          Run output:



          <p class="mw-empty-elt"> </p>
          
<p><b>Nico Ditch</b> is a six-mile (9.7&nbsp;km) long linear <a href="/wiki/Earthworks_(archaeology)" title="Earthworks (archaeology)">earthwork</a> between <a href="/wiki/Ashton-under-Lyne" title="Ashton-under-Lyne">Ashton-under-Lyne</a> and <a href="/wiki/Stretford" title="Stretford">Stretford</a> in Greater Manchester, England. It was dug as a defensive fortification, or possibly a boundary marker, between the 5th and 11th centuries. </p>
          
<p>The ditch is still visible in short sections, such as a 330-yard (300&nbsp;m) stretch in <a href="/wiki/Denton,_Greater_Manchester" title="Denton, Greater Manchester">Denton</a> Golf Course. In the parts which survive, the ditch is 4–5 yards (3.7–4.6&nbsp;m) wide and up to 5 feet (1.5&nbsp;m) deep. Part of the earthwork is protected as a <a href="/wiki/Scheduled_Ancient_Monument" class="mw-redirect" title="Scheduled Ancient Monument">Scheduled Ancient Monument</a>. </p>


          Process finished with exit code 0






          share|improve this answer

























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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            p:not(h2 ~ p) gets every single paragraph on the page that doesn't have h2 before it in the same parent. This includes nested paragraphs, paragraphs outside the main content altogether, etc, because none of those paragraphs share the same parent element as h2 itself. You don't want those; you only want the paragraphs that appear just before h2 elements within their parent element.



            For that, you want to anchor the outer p selector to the parent element. The parent element you want is .mw-parser-output:



            .mw-parser-output > p:not(h2 ~ p)





            share|improve this answer


























            • After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

              – Amr Lotfy
              Nov 24 '18 at 14:34


















            1














            p:not(h2 ~ p) gets every single paragraph on the page that doesn't have h2 before it in the same parent. This includes nested paragraphs, paragraphs outside the main content altogether, etc, because none of those paragraphs share the same parent element as h2 itself. You don't want those; you only want the paragraphs that appear just before h2 elements within their parent element.



            For that, you want to anchor the outer p selector to the parent element. The parent element you want is .mw-parser-output:



            .mw-parser-output > p:not(h2 ~ p)





            share|improve this answer


























            • After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

              – Amr Lotfy
              Nov 24 '18 at 14:34
















            1












            1








            1







            p:not(h2 ~ p) gets every single paragraph on the page that doesn't have h2 before it in the same parent. This includes nested paragraphs, paragraphs outside the main content altogether, etc, because none of those paragraphs share the same parent element as h2 itself. You don't want those; you only want the paragraphs that appear just before h2 elements within their parent element.



            For that, you want to anchor the outer p selector to the parent element. The parent element you want is .mw-parser-output:



            .mw-parser-output > p:not(h2 ~ p)





            share|improve this answer















            p:not(h2 ~ p) gets every single paragraph on the page that doesn't have h2 before it in the same parent. This includes nested paragraphs, paragraphs outside the main content altogether, etc, because none of those paragraphs share the same parent element as h2 itself. You don't want those; you only want the paragraphs that appear just before h2 elements within their parent element.



            For that, you want to anchor the outer p selector to the parent element. The parent element you want is .mw-parser-output:



            .mw-parser-output > p:not(h2 ~ p)






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 24 '18 at 21:24









            Amr Lotfy

            1,52121534




            1,52121534










            answered Nov 23 '18 at 5:55









            BoltClock♦BoltClock

            521k12911581195




            521k12911581195













            • After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

              – Amr Lotfy
              Nov 24 '18 at 14:34





















            • After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

              – Amr Lotfy
              Nov 24 '18 at 14:34



















            After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

            – Amr Lotfy
            Nov 24 '18 at 14:34







            After testing I found that changing #toc to be h2 will cover extracting summary from broader range of pages like en.wikipedia.org/wiki/Philosophy (which would not be perfectly covered if we used #toc)

            – Amr Lotfy
            Nov 24 '18 at 14:34















            1














            Code:



            public static void main(String args){
            
    Document doc = null;
            
    String url = "https://en.wikipedia.org/wiki/Nico_Ditch";
            
    try {
            
        doc = Jsoup.parse(new URL(url).openStream(), "UTF-8", url);
            
    } catch (IOException e) {
            
        e.printStackTrace();
            
    }
            

            
    Elements els = doc.select(".mw-parser-output > p:not(h2 ~ p)");
            
    System.out.println(els);
            
    // System.out.println(doc);
            
}


            Run output:



            <p class="mw-empty-elt"> </p>
            
<p><b>Nico Ditch</b> is a six-mile (9.7&nbsp;km) long linear <a href="/wiki/Earthworks_(archaeology)" title="Earthworks (archaeology)">earthwork</a> between <a href="/wiki/Ashton-under-Lyne" title="Ashton-under-Lyne">Ashton-under-Lyne</a> and <a href="/wiki/Stretford" title="Stretford">Stretford</a> in Greater Manchester, England. It was dug as a defensive fortification, or possibly a boundary marker, between the 5th and 11th centuries. </p>
            
<p>The ditch is still visible in short sections, such as a 330-yard (300&nbsp;m) stretch in <a href="/wiki/Denton,_Greater_Manchester" title="Denton, Greater Manchester">Denton</a> Golf Course. In the parts which survive, the ditch is 4–5 yards (3.7–4.6&nbsp;m) wide and up to 5 feet (1.5&nbsp;m) deep. Part of the earthwork is protected as a <a href="/wiki/Scheduled_Ancient_Monument" class="mw-redirect" title="Scheduled Ancient Monument">Scheduled Ancient Monument</a>. </p>


            Process finished with exit code 0






            share|improve this answer






























              1














              Code:



              public static void main(String args){
              
    Document doc = null;
              
    String url = "https://en.wikipedia.org/wiki/Nico_Ditch";
              
    try {
              
        doc = Jsoup.parse(new URL(url).openStream(), "UTF-8", url);
              
    } catch (IOException e) {
              
        e.printStackTrace();
              
    }
              

              
    Elements els = doc.select(".mw-parser-output > p:not(h2 ~ p)");
              
    System.out.println(els);
              
    // System.out.println(doc);
              
}


              Run output:



              <p class="mw-empty-elt"> </p>
              
<p><b>Nico Ditch</b> is a six-mile (9.7&nbsp;km) long linear <a href="/wiki/Earthworks_(archaeology)" title="Earthworks (archaeology)">earthwork</a> between <a href="/wiki/Ashton-under-Lyne" title="Ashton-under-Lyne">Ashton-under-Lyne</a> and <a href="/wiki/Stretford" title="Stretford">Stretford</a> in Greater Manchester, England. It was dug as a defensive fortification, or possibly a boundary marker, between the 5th and 11th centuries. </p>
              
<p>The ditch is still visible in short sections, such as a 330-yard (300&nbsp;m) stretch in <a href="/wiki/Denton,_Greater_Manchester" title="Denton, Greater Manchester">Denton</a> Golf Course. In the parts which survive, the ditch is 4–5 yards (3.7–4.6&nbsp;m) wide and up to 5 feet (1.5&nbsp;m) deep. Part of the earthwork is protected as a <a href="/wiki/Scheduled_Ancient_Monument" class="mw-redirect" title="Scheduled Ancient Monument">Scheduled Ancient Monument</a>. </p>


              Process finished with exit code 0






              share|improve this answer




























                1












                1








                1







                Code:



                public static void main(String args){
                
    Document doc = null;
                
    String url = "https://en.wikipedia.org/wiki/Nico_Ditch";
                
    try {
                
        doc = Jsoup.parse(new URL(url).openStream(), "UTF-8", url);
                
    } catch (IOException e) {
                
        e.printStackTrace();
                
    }
                

                
    Elements els = doc.select(".mw-parser-output > p:not(h2 ~ p)");
                
    System.out.println(els);
                
    // System.out.println(doc);
                
}


                Run output:



                <p class="mw-empty-elt"> </p>
                
<p><b>Nico Ditch</b> is a six-mile (9.7&nbsp;km) long linear <a href="/wiki/Earthworks_(archaeology)" title="Earthworks (archaeology)">earthwork</a> between <a href="/wiki/Ashton-under-Lyne" title="Ashton-under-Lyne">Ashton-under-Lyne</a> and <a href="/wiki/Stretford" title="Stretford">Stretford</a> in Greater Manchester, England. It was dug as a defensive fortification, or possibly a boundary marker, between the 5th and 11th centuries. </p>
                
<p>The ditch is still visible in short sections, such as a 330-yard (300&nbsp;m) stretch in <a href="/wiki/Denton,_Greater_Manchester" title="Denton, Greater Manchester">Denton</a> Golf Course. In the parts which survive, the ditch is 4–5 yards (3.7–4.6&nbsp;m) wide and up to 5 feet (1.5&nbsp;m) deep. Part of the earthwork is protected as a <a href="/wiki/Scheduled_Ancient_Monument" class="mw-redirect" title="Scheduled Ancient Monument">Scheduled Ancient Monument</a>. </p>


                Process finished with exit code 0






                share|improve this answer















                Code:



                public static void main(String args){
                
    Document doc = null;
                
    String url = "https://en.wikipedia.org/wiki/Nico_Ditch";
                
    try {
                
        doc = Jsoup.parse(new URL(url).openStream(), "UTF-8", url);
                
    } catch (IOException e) {
                
        e.printStackTrace();
                
    }
                

                
    Elements els = doc.select(".mw-parser-output > p:not(h2 ~ p)");
                
    System.out.println(els);
                
    // System.out.println(doc);
                
}


                Run output:



                <p class="mw-empty-elt"> </p>
                
<p><b>Nico Ditch</b> is a six-mile (9.7&nbsp;km) long linear <a href="/wiki/Earthworks_(archaeology)" title="Earthworks (archaeology)">earthwork</a> between <a href="/wiki/Ashton-under-Lyne" title="Ashton-under-Lyne">Ashton-under-Lyne</a> and <a href="/wiki/Stretford" title="Stretford">Stretford</a> in Greater Manchester, England. It was dug as a defensive fortification, or possibly a boundary marker, between the 5th and 11th centuries. </p>
                
<p>The ditch is still visible in short sections, such as a 330-yard (300&nbsp;m) stretch in <a href="/wiki/Denton,_Greater_Manchester" title="Denton, Greater Manchester">Denton</a> Golf Course. In the parts which survive, the ditch is 4–5 yards (3.7–4.6&nbsp;m) wide and up to 5 feet (1.5&nbsp;m) deep. Part of the earthwork is protected as a <a href="/wiki/Scheduled_Ancient_Monument" class="mw-redirect" title="Scheduled Ancient Monument">Scheduled Ancient Monument</a>. </p>


                Process finished with exit code 0







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 28 '18 at 9:17









                Amr Lotfy

                1,52121534




                1,52121534










                answered Nov 23 '18 at 11:33









                bluetatabluetata

                476




                476






























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