tree 4f5a1a77b486155ff7bac32a5e1fa96192434557
parent 37bf87b9bf6fdb7d81c0f750892d8613e89d7325
author danrubel <danrubel@google.com> 1545170508 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1545170508 +0000

Add TokenStreamGhostWriter for parser lookahead

This adds a new TokenStreamRewriter which does not modify the
existing token stream but instead sequences tokens such that the
new tokens lead into the existing token stream.
This is useful when using the parseExpression method
to lookahead and find the next token after the expression.

Change-Id: Id51e015f4381af65220530d07042e306b939baa3
Reviewed-on: https://dart-review.googlesource.com/c/87622
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>