A lot of tools use Ripper/RubyVM::AbstractSyntaxTree to determine
if a source is valid. These tools both create an AST instead of
providing an API that will return a boolean only.
This new API only creates the C structs, but doesn't bother
reifying them into Ruby/the serialization API. Instead it only
returns true/false, which is significantly more efficient.
7014740118
Previously numbered parameters were a field on blocks and lambdas
that indicated the maximum number of numbered parameters in either
the block or lambda, respectively. However they also had a
parameters field that would always be nil in these cases.
This changes it so that we introduce a NumberedParametersNode that
goes in place of parameters, which has a single uint8_t maximum
field on it. That field contains the maximum numbered parameter in
either the block or lambda.
As a part of the PR, I'm introducing a new UInt8Field type that
can be used on nodes, which is just to make it a little more
explicit what the maximum values can be (the maximum is actually 9,
since it only goes up to _9). Plus we can do a couple of nice
things in serialization like just read a single byte.
2d87303903
Ruby allows for 0 or negative line start, this is often used
with `eval` calls to get a correct offset when prefixing a snippet.
e.g.
```ruby
caller = caller_locations(1, 1).first
class_eval <<~RUBY, caller.path, caller.line - 2
# frozen_string_literal: true
def some_method
#{caller_provided_code_snippet}
end
RUBY
```
0d14ed1452
No encodings are guaranteed in C compilers, and other than UTF-8
encodings may be assumed in some platforms, e.g., CP932 on Windows
Japanese edition, and may result in compilation errors.
It's possible for us to parse a constant that is invalid in the
current encoding. To fix this, we wrap the intern function in an
rb_protect to ensure we always put a valid symbol into the AST.
e78398554d
The existing comment generation was hard to read and was making a lot of string manipulation. However, ERB files are already designed to do string manipulation, so we can use that instead.
So, instead of doing a split and a map, I opted to use the `#each_line` method to iterate over the lines of the file.
Also, in order to add an optional space padding at the beginning of the line, I opted to pad it with a space and to then right trim it. This makes sure that no space is left behind if the line is empty, but a space is added if the line is not empty.
5736711e70
