JS: Implement new metric queries for line counting

Author: asgerf

javascript/ql/src/Diagnostics/Files.ql

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+/**
+ * @name Total source files
+ * @description The total number of source files.
+ * @kind metric
+ * @id js/metrics/files
+ */
+
+import javascript
+
+select count(File f | not f.getATopLevel().isExterns())

javascript/ql/src/Diagnostics/Lines.ql

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+/**
+ * @name Total lines of text
+ * @description The total number of lines of text across all source files.
+ * @kind metric
+ * @id js/metrics/lines
+ */
+
+import javascript
+
+select sum(File f | not f.getATopLevel().isExterns() | f.getNumberOfLines())

javascript/ql/src/Diagnostics/LinesOfCode.ql

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+/**
+ * @name Total lines of code
+ * @description The total number of lines of code across all source files.
+ * @kind metric
+ * @id js/metrics/lines-of-code
+ */
+
+import javascript
+
+select sum(File f | not f.getATopLevel().isExterns() | f.getNumberOfLinesOfCode())

javascript/ql/src/Diagnostics/LinesOfCodePerFile.ql

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+/**
+ * @name Lines of code per source file
+ * @description The number of lines of code for each source file.
+ * @kind metric
+ * @id js/metrics/lines-of-code-per-file
+ */
+
+import javascript
+
+from File f
+where not f.getATopLevel().isExterns()
+select f, f.getNumberOfLinesOfCode()

javascript/ql/src/Diagnostics/LinesPerFile.ql

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+/**
+ * @name Lines of text per source file
+ * @description The number of lines of text for each source file.
+ * @kind metric
+ * @id js/metrics/lines-per-file
+ */
+
+import javascript
+
+from File f
+where not f.getATopLevel().isExterns()
+select f, f.getNumberOfLines()

javascript/ql/test/query-tests/Diagnostics/Lines.expected

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+| 22 |

javascript/ql/test/query-tests/Diagnostics/Lines.qlref

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+Diagnostics/Lines.ql

javascript/ql/test/query-tests/Diagnostics/LinesOfCode.expected

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+| 12 |

javascript/ql/test/query-tests/Diagnostics/LinesOfCode.qlref

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+Diagnostics/LinesOfCode.ql

javascript/ql/test/query-tests/Diagnostics/LinesOfCodePerFile.expected

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+| src/.eslintrc.yml:0:0:0:0 | src/.eslintrc.yml | 0 |
+| src/javascript_file.js:0:0:0:0 | src/javascript_file.js | 6 |
+| src/package.json:0:0:0:0 | src/package.json | 0 |
+| src/typescript_file.ts:0:0:0:0 | src/typescript_file.ts | 6 |