JavaScript: extract name in { ..., name, ...}, a shorthand for { ...,…

… name: name, ...}

Signed-off-by: Masatake YAMATO <[email protected]>

Units/parser-javascript.r/js-destructural-binding.d/expected.tags

@@ -64,3 +64,8 @@ f	input-1.js	/^function f({ u, x }) {$/;"	f	signature:({ u, x })
 anonymousObjectf91cef720105	input-1.js	/^f({u: 1, x: 2})$/;"	v
 u	input-1.js	/^f({u: 1, x: 2})$/;"	p	variable:anonymousObjectf91cef720105
 x	input-1.js	/^f({u: 1, x: 2})$/;"	p	variable:anonymousObjectf91cef720105
+f	input-2.js	/^function f(x, y, z) {$/;"	f	signature:(x, y, z)
+anonymousObjectf91d7bd30105	input-2.js	/^f({x, y, z})$/;"	v
+x	input-2.js	/^f({x, y, z})$/;"	p	variable:anonymousObjectf91d7bd30105
+y	input-2.js	/^f({x, y, z})$/;"	p	variable:anonymousObjectf91d7bd30105
+z	input-2.js	/^f({x, y, z})$/;"	p	variable:anonymousObjectf91d7bd30105

Units/parser-javascript.r/js-destructural-binding.d/input-2.js

@@ -0,0 +1,8 @@
+function f(x, y, z) {
+    return x + y + z
+}
+
+x = 1
+y = 1
+z = 1
+f({x, y, z})

parsers/jscript.c

@@ -2120,13 +2120,45 @@ static bool parseMethods (tokenInfo *const token, int class_index,
 
 			is_shorthand = isType (token, TOKEN_OPEN_PAREN);
 			bool can_be_field = isType (token, TOKEN_EQUAL_SIGN);
-			if ( isType (token, TOKEN_COLON) || can_be_field || is_shorthand )
+			/* is_comma is for handling
+			 *
+			 *     { ..., name, ... }
+			 *
+			 * . This is shorthand of
+			 *
+			 *     { ... ,name: name, ... }
+			 *
+			 * .
+			 * In this case, the token variables point to:
+			 *
+			 *     { ..., name, ... }
+			 * name-------^   ^
+			 * token----------+
+			 *
+			 */
+			bool is_comma = ((!is_es6_class && isType (token, TOKEN_CLOSE_CURLY)) || isType (token, TOKEN_COMMA));
+			if ( isType (token, TOKEN_COLON) || is_comma || can_be_field || is_shorthand )
 			{
+				tokenInfo * comma = NULL;
 				if (! is_shorthand)
 				{
-					readToken (token);
-					if (isKeyword (token, KEYWORD_async))
+					if (is_comma)
+					{
+						comma = newToken ();
+						copyToken (comma, token, true);
+						copyToken (token, name, true);
+						/*
+						 *     { ..., name, ... }
+						 * token -----^   ^
+						 * comma ---------+
+						 */
+					}
+					else
+					{
 						readToken (token);
+						if (isKeyword (token, KEYWORD_async))
+							readToken (token);
+					}
 				}
 
 				vString * signature = vStringNew ();
@@ -2218,7 +2250,19 @@ static bool parseMethods (tokenInfo *const token, int class_index,
 						else
 						{
 							copyToken (saved_token, token, true);
-							readToken (token);
+							if (comma)
+							{
+								copyToken(token, comma, true);
+								deleteToken (comma);
+								comma = NULL;
+								/*
+								 *     { ..., name, ... }
+								 *                ^
+								 * token ---------+
+								 */
+							}
+							else
+								readToken (token);
 						}
 					}
 					deleteToken (saved_token);
@@ -2235,6 +2279,8 @@ static bool parseMethods (tokenInfo *const token, int class_index,
 				}
 
 				vStringDelete (signature);
+				if (comma)
+					deleteToken (comma);
 			}
 			else
 			{