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+---
+title: HTML Scraping
+keywords:
+    - scraping
+    - "pattern matching"
+    - recursion
+    - html
+---
+
+#### Synopsis
+
+Scraping HTML is to recover raw data from HTML documents
+
+#### Description
+
+In this example we see HTML as just another language that may contain relevant information. In the case
+of HTML it is smart to reuse existing parsers, so we use an ((AbstractSyntax)) format for HTML. It is
+described in ((lang::html::AST)) and its IO interface is described in ((lang::html::IO)).
+
+In this demo we extract information from the website of the [Centraal Bureau voor Statistiek (CBS)](https://www.cbs.nl), the Dutch national centre for statistics. 
+
+We found an interesting [page](https://longreads.cbs.nl/nederland-in-cijfers-2022/hoeveel-fietsen-we-gemiddeld-per-week/) that lists how much biking the Dutchies do on average weekly:
+
+```rascal-shell
+import lang::html::IO;
+import IO;
+
+page = readHTMLFile(|https://longreads.cbs.nl/nederland-in-cijfers-2022/hoeveel-fietsen-we-gemiddeld-per-week/|);
+```
+
+As you can see the output is truncated with `...`, to see more we can use ((IO-iprintln)):
+
+```rascal-shell,continue
+iprintln(page)
+```
+
+We used Chrome's "Inspect" feature to figure out that the div class `datatable-container` is of interest.
+So let's select that using a deep match operator and bind that div to the `tab` variable:
+
+```rascal-shell,continue
+if (/tab:div(_,class=/datatable-container/) := page)
+  iprintln(tab);
+```
+
+We used a deep match pattern and then a regular expression pattern to select all `class` attributes that have `datatable-container` somewhere in the string.
+
+Every row in the table contains data, except the header row. Let's convert this entire table 
+to a relation of type `rel[str persoonskenmerken, real fietskilometers]`. 
+
+We create the match pattern by step-wise refinement. First let's just 
+list all the rows:
+
+```rascal-shell,continue
+if (/tab:div(rows,class=/datatable-container/) := page) { // <1>
+    for (/r:tr(_) := rows) { // <2>
+        println(r);
+    }
+}
+```
+
+* <1> binds the children of the div to `rows`;
+* <2> uses deep match `/` to quickly jump to all the nested `tr` nodes;
+
+Now we refined the pattern to filter out the non-header rows:
+
+```rascal-shell,continue
+if (/tab:div(rows,class=/datatable-container/) := page) { 
+    for (/r:tr([th(_,scope="row"), td(_)]) := rows) { // <3>
+        println(r);
+    }
+}
+```
+
+* <3> we matching only those `tr` that have two children, one `th` and one `td`. To be sure we also limit the first `th` to have the `scope` attribute equal to `"row"`.
+
+Now it's time to get the final data out. The category is in the first column and the numbers are in the second.
+We could make the query deeper and more complex, but we choose to add another nesting level for the sake of clarity:
+
+```rascal-shell,continue
+if (/tab:div(rows,class=/datatable-container/) := page) { 
+    for (/r:tr([category:th(_,scope="row"), number:td(_)]) := rows) { 
+        if (/text(str c) := category, /text(str n) := number) {
+            println("<c> --- <n>");
+        }
+    }
+}
+```
+
+Now we have scraped the data out of the HTML syntax tree, we have to convert it to 
+raw data. But the Dutch use comma's as decimal separators:
+
+```rascal-shell,continue,error
+import String;
+toReal("18,79");
+toReal("18.79");
+replaceAll("18,79", ",", ".")
+```
+
+```rascal-shell,continue
+rel[str persoonskenmerken, real fietskilometers] myData = {};
+if (/tab:div(rows,class=/datatable-container/) := page) { 
+    for (/r:tr([category:th(_,scope="row"), number:td(_)]) := rows) { 
+        if (/text(str c) := category, /text(str n) := number) {
+            println("<c> --- <n>");
+            myData += <c, toReal(replaceAll(n, ",", "."))>;
+        }
+    }
+}
+myData;
+```
+
+Now we have the data in a format that we can compute with:
+```rascal-shell
+myData<persoonskenmerken>
+import Set;
+theSum = sum(myData<fietskilometers>);
+relativeData = { <pk, round(avg / theSum * 100.0, 0.1) > | <pk, avg> <- myData};
+
+To keep this analysis for the future, for example when new data is published on the site, we
+can store the query in a function. It is also ready to be rewritten from structured programming
+style into a functional comprehension. Let's do that first:
+
+```rascal-shell,continue
+{ <c, toReal(replaceAll(n, ",", "."))>                      
+| /tab:div(rows,class=/datatable-container/) := page        
+, /r:tr([category:th(_,scope="row"), number:td(_)]) := rows 
+, /text(str c) := category, /text(str n) := number          
+}
+```
+
+The patterns have _not_ changed, only they have been copied to the generator/filter side
+of a ((Set-Comprehension)):
+* <1> here we have the resulting tuple that uses `c` and `n` which have been selected by pattern matching
+* <2> this is the first selector that finds the table in the page
+* <3> here we iterate over the rows that are not the header
+* <4> finally we project out the text from the two cells.
+
+Now we wrap it all up in a reusable function:
+```rascal-shell,continue
+rel[str persoonskenmerken, real fietskilometers] scrapeFietskilometers(loc address=|https://longreads.cbs.nl/nederland-in-cijfers-2022/hoeveel-fietsen-we-gemiddeld-per-week/|) 
+    = { <c, toReal(replaceAll(n, ",", "."))>                      
+        | /tab:div(rows,class=/datatable-container/)        := readHTMLFile(address)        
+        , /r:tr([category:th(_,scope="row"), number:td(_)]) := rows 
+        , /text(str c) := category, /text(str n)            := number          
+    };
+scrapeFietsKilometers()
+```
+
+Every time the function is called, the HTML is retrieved again from the site. We coded the
+URL in a default parameter, just in case a similar page exists that we might try our analysis
+on. 
+
+#### Benefits
+
+* Rascal has a lot of powerful ((PatternMatching)) operators to dissect a HTML page with;
+* Skills used in the analysis of programming languages, like traversal and pattern matching, are equally useful for HTML scraping;
+* Deep matching and ((Statements-Visit)) skip over all uninteresting content without depending on it. The more you use these "structure shy" primitives, the more robust the scraper will be against sudden changes in the HTML.
+
+#### Pitfalls
+
+* HTML scraping is a *brittle* business. If the page changes, then it's likely the query will not work
+anymore. The function will start returning empty sets of tuples in that case, most likely. If we look at the
+structural dependencies then the word `datatable-container` is very important. Also this query matches only
+tables with two columns, and the first cell is always a `th` and the second cell is `td`. Finally the actual
+data is stored in a single text cell under the `th` and `td`. If any of these properties change, this scraper 
+breaks. However, if _anything else_ changes, the scraper keeps working;
+* The HTML parser skips SVG elements;
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