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The purpose of this commit is to fix Bug #21188. We need to detect when
stdin has run in to an EOF case. Unfortunately we can't _call_ the eof
function on IO because it will block.
Here is a short script to demonstrate the issue:
```ruby
x = STDIN.gets
puts x
puts x.eof?
```
If you run the script, then type some characters (but _NOT_ a newline),
then hit Ctrl-D twice, it will print the input string. Unfortunately,
calling `eof?` will try to read from STDIN again causing us to need a
3rd Ctrl-D to exit the program.
Before introducing the EOF callback to Prism, the input loop looked
kind of like this:
```ruby
loop do
str = STDIN.gets
process(str)
if str.nil?
p :DONE
end
end
```
Which required 3 Ctrl-D to exit. If we naively changed it to something
like this:
```ruby
loop do
str = STDIN.gets
process(str)
if STDIN.eof?
p :DONE
end
end
```
It would still require 3 Ctrl-D because `eof?` would block. In this
patch, we're wrapping the IO object, checking the buffer for a newline
and length, and then using that to simulate a non-blocking eof? method.
This commit wraps STDIN and emulates a non-blocking `eof` function.
[Backport #21188]
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Introduce StringQuery to provide methods to access some metadata
about the Ruby lexer.
https://github.com/ruby/prism/commit/d3f55b67b9
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https://github.com/ruby/prism/commit/53b2866487
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https://github.com/ruby/prism/commit/578a4f983e
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https://github.com/ruby/prism/commit/af0204a8ab
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https://github.com/ruby/prism/commit/592128de4d
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https://github.com/ruby/prism/commit/f0a2ce1c0e
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https://github.com/ruby/prism/commit/efdc2b7222
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https://github.com/ruby/prism/commit/3e10c46c14
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https://github.com/ruby/prism/commit/9137226a52
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https://github.com/ruby/prism/commit/a6a552411c
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https://github.com/ruby/prism/commit/d3a149efc5
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https://github.com/ruby/prism/commit/851f2571ff
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https://github.com/ruby/prism/commit/a35b8e45ee
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https://github.com/ruby/prism/commit/27985b0e7e
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https://github.com/ruby/prism/commit/d7fbc09345
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https://github.com/ruby/prism/commit/e838eaff6f
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This reverts commit 9b76c7fc89460ed8e9be40e4037c1d68395c0f6d.
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Enable Prism using either --prism
ruby --prism test.rb
or via env var
RUBY_PRISM=1 ruby test.rb
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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.
https://github.com/ruby/prism/commit/7014740118
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https://github.com/ruby/prism/commit/98e218d989
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https://github.com/ruby/prism/commit/4f3a3e3ec1
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https://github.com/ruby/prism/commit/13fa262669
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https://github.com/ruby/prism/commit/5a2252e3ac
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https://github.com/ruby/prism/commit/f0aa8ad93b
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https://github.com/ruby/prism/commit/99e81619de
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https://github.com/ruby/prism/commit/77d4056766
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https://github.com/ruby/prism/commit/e327449db6
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https://github.com/ruby/prism/commit/9c648ce615
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https://github.com/ruby/prism/commit/26934263b7
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https://github.com/ruby/prism/commit/bd4d248fd6
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https://github.com/ruby/prism/commit/5b72f84480
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https://github.com/ruby/prism/commit/6d8358c083
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pm_scope_node_init is only used for CRuby, so should not live in the
ruby/prism repo. We will merge the changes here first so they're
not breaking, and will then remove from ruby/prism
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This reverts commit fd87372a7482cbf7672c44ef95bc1dc3b00bab7c.
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This reverts commit 67a987f82bc8a2b7ec15581306873530821fcf9e.
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Amend ScopeNode to point to previous ScopeNode, and to have void*
pointers to constants and index_lookup_table
https://github.com/ruby/prism/commit/0534324312
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