Xi Ge a4a01f9121 libSyntax: parse ternary expression. ...

Along with starting to support ternary expressions, this commit also
slightly changes SyntaxParsingContext APIs as follows:

1. Previously, makeNode() only supports node creation by using the nodes
from the underlying syntax token array; this commit allows it to use the nodes from
the pending syntax list as well.

2. This commit strictly limits that the pending syntax list should never
contain token syntax node.

3. The node kind test shouldn't include unknown kinds. They are noisy.

2017-11-14 23:29:23 -08:00

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