Force-retokenize regexps when a slash is found in expression position

Issue #751 Issue #589
acornjs · Nov 5, 2018 · f0cbb35 · f0cbb35
1 parent 3df4763
commit f0cbb35
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Showing 2 changed files with 5 additions and 0 deletions.
diff --git a/acorn/src/expression.js b/acorn/src/expression.js
@@ -304,6 +304,10 @@ pp.parseSubscripts = function(base, startPos, startLoc, noCalls) {
 // or `{}`.
 
 pp.parseExprAtom = function(refDestructuringErrors) {
+  // If a division operator appears in an expression position, the
+  // tokenizer got confused, and we force it to read a regexp instead.
+  if (this.type === tt.slash) this.readRegexp()
+
   let node, canBeArrow = this.potentialArrowAt === this.start
   switch (this.type) {
   case tt._super:

diff --git a/test/tests.js b/test/tests.js
@@ -26840,6 +26840,7 @@ test("x = {foo: function x() {} / divide}", {});
 test("foo; function f() {} /regexp/", {});
 test("{function f() {} /regexp/}", {});
 test("function fn() {return\nfunction foo() {}\n/42/}", {});
+test("var x\n/foo/", {});
 
 test("{}/=/", {
   type: "Program",