[gjs] coverage: Don't error out on various files

[Philip Chimento <pchimento src gnome org>]

commit 2a1ed02bce5ae74bed099f3130a1aa30938894d2
Author: Philip Chimento <philip chimento gmail com>
Date:   Fri Sep 22 22:52:49 2017 -0700

    coverage: Don't error out on various files
    
    The coverage statistics should handle files with #! on the first line,
    and ignore files with names within angle brackets, which is our
    convention for scripts that are fed to the JS engine programmatically.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788166

 installed-tests/js/testCoverage.js |   19 +++++++++++++++----
 modules/_bootstrap/coverage.js     |    6 ++++++
 2 files changed, 21 insertions(+), 4 deletions(-)
---
diff --git a/installed-tests/js/testCoverage.js b/installed-tests/js/testCoverage.js
index f0b4d39..8a0cbe6 100644
--- a/installed-tests/js/testCoverage.js
+++ b/installed-tests/js/testCoverage.js
@@ -1041,11 +1041,16 @@ describe('Coverage statistics container', function () {
                     "\n",
         'uncached': "function f() {\n" +
                     "    return 1;\n" +
-                    "}\n"
+                    '}\n',
+        'shebang': `#!/usr/bin/env gjs
+            function f() {}
+            `,
     };
 
     const MockFilenames = Object.keys(MockFiles).concat(['nonexistent']);
 
+    let container;
+
     beforeEach(function () {
         Coverage.getFileContents =
             jasmine.createSpy('getFileContents').and.callFake(f => MockFiles[f]);
@@ -1053,11 +1058,10 @@ describe('Coverage statistics container', function () {
             jasmine.createSpy('getFileChecksum').and.returnValue('abcd');
         Coverage.getFileModificationTime =
             jasmine.createSpy('getFileModificationTime').and.returnValue([1, 2]);
+        container = new Coverage.CoverageStatisticsContainer(MockFilenames);
     });
 
     it('fetches valid statistics for file', function () {
-        let container = new Coverage.CoverageStatisticsContainer(MockFilenames);
-
         let statistics = container.fetchStatistics('filename');
         expect(statistics).toBeDefined();
 
@@ -1066,10 +1070,17 @@ describe('Coverage statistics container', function () {
     });
 
     it('throws for nonexisting file', function () {
-        let container = new Coverage.CoverageStatisticsContainer(MockFilenames);
         expect(() => container.fetchStatistics('nonexistent')).toThrow();
     });
 
+    it('handles a shebang on line 1', function () {
+        expect(() => container.fetchStatistics('shebang')).not.toThrow();
+    });
+
+    it('ignores a file in angle brackets (our convention for programmatic scripts)', function () {
+        expect(() => container.fetchStatistics('<script>')).not.toThrow();
+    });
+
     const MockCache = '{ \
         "filename": { \
             "mtime": [1, 2], \
diff --git a/modules/_bootstrap/coverage.js b/modules/_bootstrap/coverage.js
index 7bbde49..b7beae3 100644
--- a/modules/_bootstrap/coverage.js
+++ b/modules/_bootstrap/coverage.js
@@ -760,6 +760,9 @@ function _fetchCountersFromCache(filename, cache, nLines) {
 }
 
 function _fetchCountersFromReflection(filename, contents, nLines) {
+    // Shebang is illegal character sequence to JS parser
+    if (contents.startsWith('#!'))
+        contents = '//' + contents;
     let reflection = Reflect.parse(contents);
     let functions = functionsForAST(reflection);
 
@@ -798,6 +801,9 @@ function CoverageStatisticsContainer(prefixes, cache) {
     }
 
     function ensureStatisticsFor(filename) {
+        // Skip scripts fed to JS engine programmatically.
+        if (filename.startsWith('<') && filename.endsWith('>'))
+            return undefined;
         if (!coveredFiles[filename])
             coveredFiles[filename] = createStatisticsFor(filename);
         return coveredFiles[filename];