I use following now to check syntax error:
system "ruby -wc path/to/file.rb"
but it very waste time if there are too many file(for instance, i refactory code), so my question is: is there way to ruby syntax check in ruby code?
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Seems like you're doing it the right way. Might be interesting for you: github.com/cypher/git-ruby-syntax-check/blob/master/pre-commitDenis de Bernardy– Denis de Bernardy2014-12-03 13:08:02 +00:00Commented Dec 3, 2014 at 13:08
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check syntax in runtime?Roman Kiselenko– Roman Kiselenko2014-12-03 13:09:04 +00:00Commented Dec 3, 2014 at 13:09
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where do you put that line?Stefan– Stefan2014-12-03 13:10:10 +00:00Commented Dec 3, 2014 at 13:10
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1OP seems to be looking for a means to check from within a Ruby script rather than the shell. But OP found the answer already, and is hoping there's some kind of better way.Denis de Bernardy– Denis de Bernardy2014-12-03 13:10:44 +00:00Commented Dec 3, 2014 at 13:10
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Did my answer help you at all? If so, can you upvote it? Or if not, then I'll delete it.joelparkerhenderson– joelparkerhenderson2014-12-09 20:51:02 +00:00Commented Dec 9, 2014 at 20:51
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4 Answers
Under MRI, you can use RubyVM::InstructionSequence#compile (relevant documentation) to compile Ruby code (which will throw exceptions if there are errors):
2.1.0 :001 > RubyVM::InstructionSequence.compile "a = 1 + 2"
=> <RubyVM::InstructionSequence:<compiled>@<compiled>>
2.1.0 :002 > RubyVM::InstructionSequence.compile "a = 1 + "
<compiled>:1: syntax error, unexpected end-of-input
a = 1 +
^
SyntaxError: compile error
from (irb):2:in `compile'
from (irb):2
from /usr/local/rvm/rubies/ruby-2.1.0/bin/irb:11:in `<main>'
Comments
My experience has been that the easiest way to check whether my code is properly compiled is to run automated tests. The compiler is going to do the same work whether it's compiling to run tests or just checking that files are lexically correct.
MRI
MRI's parser is written in C. I couldn't find a specific reference to how to access it, though I'm sure there's a way to do that. If only someone had spent some time making Ruby more Ruby-aware...
Rubinius
In Rubinius, there is direct access to the parser via Melbourne:
rbx-2.2.10 :039 > Rubinius::ToolSets::Runtime::Melbourne.parse_file("./todo.txt")
SyntaxError: expecting keyword_do or '{' or '(': ./todo.txt:2:17
and for a valid ruby file:
rbx-2.2.10 :044 > Rubinius::ToolSets::Runtime::Melbourne.parse_file('./valid.rb')
=> #<Rubinius::ToolSets::Runtime::AST::Class:0x1e6b4 @name=# <Rubinius::ToolSets::Runtime::AST::ClassName:0x1e6b8 @name=:RubyStuff @line=1 @superclass=#<Rubinius::ToolSets::Runtime::AST::NilLiteral:0x1e6bc @line=1>> @body=#<Rubinius::ToolSets::Runtime::AST::EmptyBody:0x1e6c8 @line=1> @line=1 @superclass=#<Rubinius::ToolSets::Runtime::AST::NilLiteral:0x1e6bc @line=1>>
Command-Line
You're currently using command-line tools to parse ruby. If you're doing some looping through files in Ruby, maybe you should just take that to the command-line as well and do something like:
jw@logopolis:/projects/open/compile-test$ find . | grep ".rb$" | xargs ruby -c
Syntax OK
jw@logopolis:/projects/open/compile-test$ find . | grep ".rb$" | xargs ruby -c
./invalid.rb:2: expecting $end: ./invalid.rb:2:3
which looks like this in Ruby:
system "find . | grep ".rb$" | xargs ruby -c"
References
1 Comment
nroose
My ruby only will check one file at a time... Is there really a version of the ruby command that will take more than one file and not treat all but the first as a parameter to the first?
The simplest way is with the command line -c flag:
ruby -c file_you_want_to_check.rb
Comments
You can use Ripper, the Ruby interface to the Ruby parser:
