Filtering now computes coverage percentages properly.

9 files changed, 71 insertions, 21 deletions

diff --git a/coverage/html.py b/coverage/html.py
index 91ae2c27..0829f219 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -67,6 +67,7 @@ class HtmlReporter(Reporter):
         self.directory = None
         self.template_globals = {
             'escape': escape,
+            'pair': pair,
             'title': self.config.html_title,
             '__url__': coverage.__url__,
             '__version__': coverage.__version__,
@@ -379,3 +380,7 @@ def spaceless(html):
     """
     html = re.sub(r">\s+<p ", ">\n<p ", html)
     return html
+
+def pair(ratio):
+    """Format a pair of numbers so JavaScript can read them in an attribute."""
+    return "%s %s" % ratio
diff --git a/coverage/htmlfiles/coverage_html.js b/coverage/htmlfiles/coverage_html.js
index 6eb23fee..336b97b4 100644
--- a/coverage/htmlfiles/coverage_html.js
+++ b/coverage/htmlfiles/coverage_html.js
@@ -116,9 +116,17 @@ coverage.wire_up_filter = function () {
                         break;
                     }
 
-                    var sum = 0;
+                    var sum = 0, numer = 0, denom = 0;
                     $.each(cells.filter(':visible'), function () {
-                        sum += parseInt(this.innerHTML, 10);
+                        var ratio = $(this).data("ratio");
+                        if (ratio) {
+                            var splitted = ratio.split(" ");
+                            numer += parseInt(splitted[0], 10);
+                            denom += parseInt(splitted[1], 10);
+                        }
+                        else {
+                            sum += parseInt(this.innerHTML, 10);
+                        }
                     });
 
                     // Get footer cell element.
@@ -126,8 +134,15 @@ coverage.wire_up_filter = function () {
 
                     // Set value into dynamic footer cell element.
                     if (cells[0].innerHTML.indexOf('%') > -1) {
-                        // Value of "coverage" column is expressed as a percentage
-                        footer_cell.text(parseInt((sum / show.length), 10) + '%');
+                        // Percentage columns use the numerator and denominator,
+                        // and adapt to the number of decimal places.
+                        var match = /\.([0-9]+)/.exec(cells[0].innerHTML);
+                        var places = 0;
+                        if (match) {
+                            places = match[1].length;
+                        }
+                        var pct = numer * 100 / denom;
+                        footer_cell.text(pct.toFixed(places) + '%');
                     }
                     else {
                         footer_cell.text(sum);
diff --git a/coverage/htmlfiles/index.html b/coverage/htmlfiles/index.html
index 4b572711..bea715e1 100644
--- a/coverage/htmlfiles/index.html
+++ b/coverage/htmlfiles/index.html
@@ -78,7 +78,7 @@
                 <td>{{totals.n_branches}}</td>
                 <td>{{totals.n_partial_branches}}</td>
                 {% endif %}
-                <td class='right'>{{totals.pc_covered_str}}%</td>
+                <td class='right' data-ratio='{{totals.ratio_covered|pair}}'>{{totals.pc_covered_str}}%</td>
             </tr>
         </tfoot>
         <tbody>
@@ -92,7 +92,7 @@
                 <td>{{file.nums.n_branches}}</td>
                 <td>{{file.nums.n_partial_branches}}</td>
                 {% endif %}
-                <td class='right'>{{file.nums.pc_covered_str}}%</td>
+                <td class='right' data-ratio='{{file.nums.ratio_covered|pair}}'>{{file.nums.pc_covered_str}}%</td>
             </tr>
             {% endfor %}
         </tbody>
diff --git a/coverage/results.py b/coverage/results.py
index 6c41a944..5eff0f3e 100644
--- a/coverage/results.py
+++ b/coverage/results.py
@@ -204,8 +204,8 @@ class Numbers(object):
     def pc_covered(self):
         """Returns a single percentage value for coverage."""
         if self.n_statements > 0:
-            pc_cov = (100.0 * (self.n_executed + self.n_executed_branches) /
-                        (self.n_statements + self.n_branches))
+            numerator, denominator = self.ratio_covered
+            pc_cov = (100.0 * numerator) / denominator
         else:
             pc_cov = 100.0
         return pc_cov
@@ -236,6 +236,13 @@ class Numbers(object):
             width += 1 + cls._precision
         return width
 
+    @property
+    def ratio_covered(self):
+        """Return a numerator and denominator for the coverage ratio."""
+        numerator = self.n_executed + self.n_executed_branches
+        denominator = self.n_statements + self.n_branches
+        return numerator, denominator
+
     def __add__(self, other):
         nums = Numbers()
         nums.n_files = self.n_files + other.n_files
diff --git a/tests/farm/html/gold_omit_1/index.html b/tests/farm/html/gold_omit_1/index.html
index b7ee3594..34fd8fcb 100644
--- a/tests/farm/html/gold_omit_1/index.html
+++ b/tests/farm/html/gold_omit_1/index.html
@@ -4,7 +4,9 @@
     <meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
     <title>Coverage report</title>
     <link rel='stylesheet' href='style.css' type='text/css'>
+    
     <script type='text/javascript' src='jquery.min.js'></script>
+    <script type='text/javascript' src='jquery.debounce.min.js'></script>
     <script type='text/javascript' src='jquery.tablesorter.min.js'></script>
     <script type='text/javascript' src='jquery.hotkeys.js'></script>
     <script type='text/javascript' src='coverage_html.js'></script>
@@ -12,19 +14,25 @@
         jQuery(document).ready(coverage.index_ready);
     </script>
 </head>
-<body id='indexfile'>
+<body class='indexfile'>
 
 <div id='header'>
     <div class='content'>
         <h1>Coverage report:
             <span class='pc_cov'>100%</span>
         </h1>
-        <img id='keyboard_icon' src='keybd_closed.png'>
+
+        <img id='keyboard_icon' src='keybd_closed.png' />
+
+        <form id="filter_container">
+            <label for="filter">Filter</label>
+            <input id="filter" type="text" value="" />
+        </form>
     </div>
 </div>
 
 <div class='help_panel'>
-    <img id='panel_icon' src='keybd_open.png'>
+    <img id='panel_icon' src='keybd_open.png' />
     <p class='legend'>Hot-keys on this page</p>
     <div>
     <p class='keyhelp'>
@@ -59,7 +67,7 @@
                 <td>0</td>
                 <td>0</td>
                 
-                <td class='right'>100%</td>
+                <td class='right' data-ratio='14 14'>100%</td>
             </tr>
         </tfoot>
         <tbody>
@@ -70,7 +78,7 @@
                 <td>0</td>
                 <td>0</td>
                 
-                <td class='right'>100%</td>
+                <td class='right' data-ratio='2 2'>100%</td>
             </tr>
             
             <tr class='file'>
@@ -79,7 +87,7 @@
                 <td>0</td>
                 <td>0</td>
                 
-                <td class='right'>100%</td>
+                <td class='right' data-ratio='2 2'>100%</td>
             </tr>
             
             <tr class='file'>
@@ -88,7 +96,7 @@
                 <td>0</td>
                 <td>0</td>
                 
-                <td class='right'>100%</td>
+                <td class='right' data-ratio='2 2'>100%</td>
             </tr>
             
             <tr class='file'>
@@ -97,17 +105,21 @@
                 <td>0</td>
                 <td>0</td>
                 
-                <td class='right'>100%</td>
+                <td class='right' data-ratio='8 8'>100%</td>
             </tr>
             
         </tbody>
     </table>
+
+    <p id="no_rows">
+        No items found using the specified filter.
+    </p>
 </div>
 
 <div id='footer'>
     <div class='content'>
         <p>
-            <a class='nav' href='http://nedbatchelder.com/code/coverage/3.5a1'>coverage.py v3.5a1</a>
+            <a class='nav' href='http://nedbatchelder.com/code/coverage/4.0a1'>coverage.py v4.0a1</a>
         </p>
     </div>
 </div>
diff --git a/tests/farm/html/run_a.py b/tests/farm/html/run_a.py
index 59cc1703..3fabd6f5 100644
--- a/tests/farm/html/run_a.py
+++ b/tests/farm/html/run_a.py
@@ -19,7 +19,8 @@ contains("html_a/a.html",
     )
 contains("html_a/index.html",
     "<a href='a.html'>a</a>",
-    "<span class='pc_cov'>67%</span>"
+    "<span class='pc_cov'>67%</span>",
+    "<td class='right' data-ratio='2 3'>67%</td>",
     )
 
 clean("html_a")
diff --git a/tests/farm/html/run_b_branch.py b/tests/farm/html/run_b_branch.py
index d0955a2a..0e584a6d 100644
--- a/tests/farm/html/run_b_branch.py
+++ b/tests/farm/html/run_b_branch.py
@@ -22,7 +22,8 @@ contains("html_b_branch/b.html",
     )
 contains("html_b_branch/index.html",
     "<a href='b.html'>b</a>",
-    "<span class='pc_cov'>70%</span>"
+    "<span class='pc_cov'>70%</span>",
+    "<td class='right' data-ratio='16 23'>70%</td>",
     )
 
 clean("html_b_branch")
diff --git a/tests/test_farm.py b/tests/test_farm.py
index 214681ef..18c6b4a7 100644
--- a/tests/test_farm.py
+++ b/tests/test_farm.py
@@ -4,7 +4,6 @@ import difflib, filecmp, fnmatch, glob, os, re, shutil, sys
 from nose.plugins.skip import SkipTest
 
 from tests.backtest import run_command, execfile      # pylint: disable=W0622
-from tests.coveragetest import CoverageTest
 
 from coverage.control import _TEST_NAME_FILE
 
@@ -367,7 +366,7 @@ def main():     # pragma: not covered
     Commands:
 
     run testcase ...    - Run specific test case(s)
-    out testcase ...    - Run test cases, but don't clean up, to see the output.
+    out testcase ...    - Run test cases, but don't clean up, leaving output.
     clean               - Clean all the output for all tests.
 
     """
diff --git a/tests/test_results.py b/tests/test_results.py
index 92c174b6..4ce048b6 100644
--- a/tests/test_results.py
+++ b/tests/test_results.py
@@ -58,3 +58,13 @@ class NumbersTest(CoverageTest):
         self.assertEqual(n9999.pc_covered_str, "0.1")
         self.assertEqual(n10000.pc_covered_str, "0.0")
         Numbers.set_precision(0)
+
+    def test_covered_ratio(self):
+        n = Numbers(n_files=1, n_statements=200, n_missing=47)
+        self.assertEqual(n.ratio_covered, (153, 200))
+
+        n = Numbers(
+            n_files=1, n_statements=200, n_missing=47,
+            n_branches=10, n_missing_branches=3, n_partial_branches=1000,
+        )
+        self.assertEqual(n.ratio_covered, (160, 210))