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author | Johannes Ewald <johannes.ewald@peerigon.com> | 2015-04-28 01:46:50 +0300 |
---|---|---|
committer | Johannes Ewald <johannes.ewald@peerigon.com> | 2015-04-28 01:46:50 +0300 |
commit | bbbd05cab7260f7db9ffcb4adb2e19bdf661bca9 (patch) | |
tree | f1d61fe120ad564e911f72f6c8b0b395083731f4 | |
parent | 7cd73d4d70f103814035bc8cb5648d71d4960562 (diff) |
Fix issue where the strict mode was not detected when a comment was before "strict mode";
Fixes #54
-rw-r--r-- | lib/detectStrictMode.js | 20 | ||||
-rw-r--r-- | test/detectStrictMode.test.js | 12 |
2 files changed, 29 insertions, 3 deletions
diff --git a/lib/detectStrictMode.js b/lib/detectStrictMode.js index 35f27fb..57dc14d 100644 --- a/lib/detectStrictMode.js +++ b/lib/detectStrictMode.js @@ -1,3 +1,7 @@ +var multiLineComment = /^\s*\/\*.*?\*\//;
+var singleLineComment = /^\s*\/\/.*?[\r\n]/;
+var strictMode = /^\s*(?:"use strict"|'use strict')[ \t]*(?:[\r\n]|;)/;
+
/**
* Returns true if the source code is intended to run in strict mode. Does not detect
* "use strict" if it occurs in a nested function.
@@ -6,7 +10,19 @@ * @return {Boolean}
*/
function detectStrictMode(src) {
- return (/^\s*(?:"use strict"|'use strict')[ \t]*(?:[\r\n]|;)/g).test(src);
+ var singleLine;
+ var multiLine;
+
+ while ((singleLine = singleLineComment.test(src)) || (multiLine = multiLineComment.test(src))) {
+ if (singleLine) {
+ src = src.replace(singleLineComment, "");
+ }
+ if (multiLine) {
+ src = src.replace(multiLineComment, "");
+ }
+ }
+
+ return strictMode.test(src);
}
-module.exports = detectStrictMode;
\ No newline at end of file +module.exports = detectStrictMode;
diff --git a/test/detectStrictMode.test.js b/test/detectStrictMode.test.js index 5cde34e..06eb1c4 100644 --- a/test/detectStrictMode.test.js +++ b/test/detectStrictMode.test.js @@ -2,6 +2,7 @@ var expect = require("expect.js"), detectStrictMode = require("../lib/detectStrictMode.js"); describe("detectStrictMode", function () { + it("should detect all valid uses of \"use strict\";", function () { expect(detectStrictMode('"use strict";')).to.be(true); expect(detectStrictMode("'use strict';")).to.be(true); @@ -11,13 +12,22 @@ describe("detectStrictMode", function () { expect(detectStrictMode('"use strict"\r\n')).to.be(true); expect(detectStrictMode('"use strict" ; test();')).to.be(true); }); + + it("should be allowed to place comments before \"use strict\";", function () { + expect(detectStrictMode('// some comment\n"use strict";')).to.be(true); + expect(detectStrictMode('/* yo! */"use strict"; /* another comment */')).to.be(true); + expect(detectStrictMode(' // yes yo\r\n\r\n\r\n /*oh yoh*/\r\n//oh snap!\r /* yoh! */"use strict";')).to.be(true); + }); + it("should not detect invalid uses of \"use strict\";", function () { expect(detectStrictMode('" use strict ";')).to.be(false); expect(detectStrictMode('"use strict".replace("use", "fail");')).to.be(false); expect(detectStrictMode('"use strict" .replace("use", "fail");')).to.be(false); expect(detectStrictMode(';"use strict";')).to.be(false); }); + it("should not detect \"use strict\"; if it occurs in some nested function", function () { expect(detectStrictMode('function () {"use strict";}')).to.be(false); }); -});
\ No newline at end of file + +}); |