Method expr

rhino/src/main/java/org/mozilla/javascript/Parser.java:2667–2682

(boolean allowTrailingComma)

    }

    private AstNode expr(boolean allowTrailingComma) throws IOException {
        AstNode pn = assignExpr();
        int pos = pn.getPosition();
        while (matchToken(Token.COMMA, true)) {
            int opPos = ts.tokenBeg;
            if (compilerEnv.isStrictMode() && !pn.hasSideEffects())
                addStrictWarning("msg.no.side.effects", "", pos, nodeEnd(pn) - pos);
            if (peekToken() == Token.YIELD) reportError("msg.yield.parenthesized");
            if (allowTrailingComma && peekToken() == Token.RP) {
                pn.putIntProp(Node.TRAILING_COMMA, 1);
                return pn;
            }
            pn = new InfixExpression(Token.COMMA, pn, assignExpr(), opPos);
        }
        return pn;
    }

    private AstNode assignExpr() throws IOException {
        int tt = peekToken();