JavaScript: handle spread syntax

With this change, the parser skip "..." and the subsequent expression.

ref. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

Related to universal-ctags#3435.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

Units/parser-javascript.r/spread-operator.d/args.ctags

@@ -0,0 +1 @@
+--sort=no

Units/parser-javascript.r/spread-operator.d/expected.tags

@@ -0,0 +1,8 @@
+foo	input.js	/^const embedded = { foo: 'bar' }$/;"	p	variable:embedded
+embedded	input.js	/^const embedded = { foo: 'bar' }$/;"	v
+baz	input.js	/^  baz: 'fox',$/;"	p	variable:something
+something	input.js	/^const something = {$/;"	v
+mapGetters	input.js	/^const mapGetters = function() {}$/;"	f
+computed	input.js	/^const computed = {$/;"	C
+fn	input.js	/^  fn: () => { \/* doing something *\/ },$/;"	m	variable:FNO
+FNO	input.js	/^const FNO = {$/;"	v

Units/parser-javascript.r/spread-operator.d/input.js

@@ -0,0 +1,22 @@
+//
+// This test input is based on the comment submitted by @AdrienGiboire in #3435
+//
+
+const embedded = { foo: 'bar' }
+const something = {
+  ...embedded,
+  baz: 'fox',
+}
+
+const mapGetters = function() {}
+const computed = {
+  ...mapGetters([
+    'getAsylumAssistant',
+    'getModel',
+    'getType',
+  ]),
+}
+
+const FNO = {
+  fn: () => { /* doing something */ },
+}

parsers/jscript.c

@@ -2019,6 +2019,12 @@ static bool parseMethods (tokenInfo *const token, int class_index,
 
 			deleteToken (saved_token);
 		}
+		else if (isType (token, TOKEN_DOTS))
+		{
+			/* maybe spread operator. Just skip the next expression. */
+			findCmdTerm(token, true, true);
+			continue;
+		}
 
 		if (! isType (token, TOKEN_KEYWORD) &&
 			! isType (token, TOKEN_SEMICOLON))