Xi Ge e560170a60 libSyntax: Parse member access expression. (#13119) ...

* libSyntax: Parse member access expression.

This patch uses createNodeInPlace from syntax parsing context API to
merge an expression with its suffix to create recursive nodes such as
member access expression.

Meanwhile, this patch breaks down a signed integer or float literal to a
prefix operator expression. This expression consists of two parts: an
operator and the following expression. This makes literals like "+1" or
"-1" no different from other prefix unary expressions such as "!true".

2017-11-28 16:29:50 -08:00

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