Essentially, this change updates `yp_unescape_calculate_difference` to
not create syntax errors, and we rely entirely on
`yp_unescape_manipulate_string` to report syntax errors.
To do that, this PR adds another (!) parameter to `unescape`:
`yp_list_t *error_list`. When present, `unescape` reports syntax
errors (and otherwise does not).
However, an edge case that needed to be addressed is reporting syntax
errors in this case:
?\u{1234 2345}
In a string context, it's possible to have multiple codepoints by
doing something like `"\u{1234 2345}"`; however, in the character
literal context, this is a syntax error -- only a single codepoint is
allowed.
Unfortunately, when `yp_unescape_manipulate_string` is called, there's
nothing to indicate that we are in a "character literal" context and
that only a single codepoint is valid.
To make this work, this PR:
- introduces a new static utility function in yarp.c,
`yp_char_literal_node_create_and_unescape`, which is called when
we're parsing `YP_TOKEN_CHARACTER_LITERAL`
- introduces a new (unexported) function,
`yp_unescape_manipulate_char_literal` which does the same thing as
`yp_unescape_manipulate_string` but tells `unescape` that only a
single codepoint is expected
f6a65840b5
This commit is the initial sync of all files from ruby/yarp
into ruby/ruby. Notably, it does the following:
* Sync all ruby/yarp/lib/ files to ruby/ruby/lib/yarp
* Sync all ruby/yarp/src/ files to ruby/ruby/yarp/
* Sync all ruby/yarp/test/ files to ruby/ruby/test/yarp
