This reverts commit 2b0b19b87c60d2cdb329979acbb96e12a1f940e7.
New IRB parser needs new Ripper what has lex_state too. The new Ripper is
adopted by Ruby 2.5 or later.
https://github.com/ruby/irb/commit/9ab6e35a2c
"IRB::InputMethod#eof?" requires eof status each user input but
"ReidlineInputMethod#eof?" used "Reline.eof?" what is singleton data.
"ReidlineInputMethod#eof?" is changed to use the result of user input.
Let's say we are in progress to write `"foo"`:
```
irb> "fo
```
at this moment, nothing is wrong.
It would be just a normal way to write `"foo"`.
Prior to this commit, the `fo` part was warned because of
5b64d7ac6e. But I think warning such a
normal input is not valuable for users.
However, we'd like to warn `:@1` or `@@1` which is also a syntax error.
Then this commit switches the syntax highlight based on whether the
input text is finished or not. When it's not finished yet, it does not
warn compile_error.
Reline is a readline stdlib compatible library. It also supports
multiline input. IRB is improved with Reline and supports multiline.
Besides, supports showing documents when completed.
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When you change this to true, you may need to add more tests.
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line options. [ruby-dev:37161]. Fixes#711.
improved long optinos.
* lib/irb/init.rb (IRB.set_encoding): new subroutine for IRB.opt_parse
* lib/irb/input-method.rb (IRB::StdioInputMethod): (M17N) regards
scripts that user types as encoded in the external_encoding.
* lib/irb/input-method.rb (IRB::ReadlineInputMethod): ditto.
* lib/irb/input-method.rb (IRB::FileInputMethod): (M17N) respects
magic comment.
* lib/irb/help.rb (IRB.print_usage): (M17N) respects magic comment
in the resource file.
* lib/irb/lc/help-message: adds -U and -E.
* lib/irb/lc/ja/help-message: ditto. re-encoded from ISO-2022-JP into UTF-8.
* lib/irb/lc/ja/encoding_aliases.rb: new file. provides Japanese specific
character encoding name table for backward compatibility.
* lib/irb/lc/ja/error.rb: re-eoncoded from ISO-2022-JP into UTF-8.
magic comment.
* lib/irb/locale.rb: integrated with Ruby 1.9's M17N support.
* lib/irb/magic-file.rb: new file. utility to handle files with magic
comment and opens in the correct encoding.
* lib/irb/ruby-lex.rb (RubyLex#each_top_level_statement): recovers
character encoding for a statement after it lexed so that irb can
eval the statement in correct encoding.
* lib/irb/src_encoding.rb: new file. utility.
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* ext/readline/readline.c (readline_s_set_input): new method.
* ext/readline/readline.c (readline_s_set_output): new method.
* lib/irb/input-method.rb: set Readline.input and Readline.output.
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* ext/readline/extconf.rb: added new option --enable-libedit.
* test/readline/test_readline.rb: added assertions for
Readline::HISTORY.
* lib/irb/input-method.rb: do not use Readline::HISTORY.pop.
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* lib/irb/input-method.rb (IRB::ReadlineInputMethod::initialize):
load and save history automatically. [ruby-core:02352]
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