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JS: recognize A.substr(0, B.length) == B

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Asger F
2019-01-08 17:57:24 +00:00
parent f9951f67fe
commit cf3dfcae21
3 changed files with 40 additions and 0 deletions
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4
javascript/ql/test/library-tests/StringOps/StartsWith/StartsWith.expected
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@@ -8,3 +8,7 @@
| tst.js:12:9:12:20 | A.indexOf(B) | tst.js:12:9:12:9 | A | tst.js:12:19:12:19 | B | false |
| tst.js:13:10:13:21 | A.indexOf(B) | tst.js:13:10:13:10 | A | tst.js:13:20:13:20 | B | false |
| tst.js:14:11:14:22 | A.indexOf(B) | tst.js:14:11:14:11 | A | tst.js:14:21:14:21 | B | false |
| tst.js:15:9:15:38 | A.subst ... ) === B | tst.js:15:9:15:9 | A | tst.js:15:38:15:38 | B | true |
| tst.js:16:9:16:38 | A.subst ... ) !== B | tst.js:16:9:16:9 | A | tst.js:16:38:16:38 | B | false |
| tst.js:17:9:17:35 | A.subst ... ) === B | tst.js:17:9:17:9 | A | tst.js:17:35:17:35 | B | true |
| tst.js:18:9:18:36 | A.subst ... "web/" | tst.js:18:9:18:9 | A | tst.js:18:31:18:36 | "web/" | true |

5
javascript/ql/test/library-tests/StringOps/StartsWith/tst.js
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@@ -12,6 +12,10 @@ function f(A, B) {
if (A.indexOf(B)) {} // !startsWith
if (!A.indexOf(B)) {} // startsWith
if (!!A.indexOf(B)) {} // !startsWith
if (A.substring(0, B.length) === B) {}
if (A.substring(0, B.length) !== B) {}
if (A.substr(0, B.length) === B) {}
if (A.substring(0, 4) === "web/") {}
// non-examples
if (_.startsWith(A, B, 2)) {}
@@ -22,4 +26,5 @@ function f(A, B) {
if (A.indexOf(B, 2) === 0) {}
if (A.indexOf(B, 2)) {}
if (~A.indexOf(B)) {} // checks for existence, not startsWith
if (A.substring(B.length) === 0) {}
}