[analyzer] Teach scan-build to filter reports by file.

That's a new GUI bell-and-whistle in the index.html page.

clang/test/Analysis/scan-build/html_output.test

@@ -19,13 +19,17 @@ CHECK-FILENAMES: report-{{.*}}.html
 CHECK-FILENAMES: scanview.css
 CHECK-FILENAMES: sorttable.js
 
-
-// The index should have a link to the report for the single issue.
+// Tests for the front page.
 RUN: cat %t.output_dir/*/index.html \
 RUN:     | FileCheck %s -check-prefix CHECK-INDEX-HTML
 
+// Let's confirm that the new filtering facility is present.
+CHECK-INDEX-HTML: Filter Results by File
+
+// The index should have a link to the report for the single issue.
 CHECK-INDEX-HTML: <!-- REPORTBUG id="report-{{.*}}.html" -->
 
+
 // The report should describe the issue.
 RUN: cat %t.output_dir/*/report-*.html \
 RUN:     | FileCheck %s -check-prefix CHECK-REPORT-HTML

clang/tools/scan-build/bin/scan-build

@@ -722,9 +722,18 @@ ENDTEXT
 
 print OUT <<ENDTEXT;
 </table>
+
+<h2>Filter Results by File</h2>
+<input
+  type="text"
+  id="file_input"
+  onkeyup="searchFiles()"
+  placeholder="Enter a path or filename"
+  title="Enter a path or filename">
+
 <h2>Reports</h2>
 
-<table class="sortable" style="table-layout:automatic">
+<table id="reports_table" class="sortable" style="table-layout:automatic">
 <thead><tr>
   <td>Bug Group</td>
   <td class="sorttable_sorted">Bug Type<span id="sorttable_sortfwdind">&nbsp;&#x25BE;</span></td>

clang/tools/scan-build/share/scan-build/sorttable.js

@@ -490,3 +490,23 @@ var forEach = function(object, block, context) {
 		resolve.forEach(object, block, context);
 	}
 };
+
+// filter results by filename
+const searchFiles = () => {
+  const columns = [
+    { name: 'Filename', index: 2, isFilter: true },
+  ]
+  const filterColumns = columns.filter(c => c.isFilter).map(c => c.index)
+  const trs = document.querySelectorAll(`#reports_table tr:not(.header)`)
+  const filter = document.querySelector('#file_input').value
+  const regex = new RegExp(escape(filter), 'i')
+  const isFoundInTds = td => regex.test(td.innerHTML)
+  const isFound = childrenArr => childrenArr.some(isFoundInTds)
+  const setTrStyleDisplay = ({ style, children }) => {
+    style.display = isFound([
+      ...filterColumns.map(c => children[c])
+    ]) ? '' : 'none'
+  }
+
+  trs.forEach(setTrStyleDisplay)
+}