123456789_123456789_123456789_123456789_123456789_

Module: Prism

Relationships & Source Files
Namespace Children
Modules:
HeredocQuery, LibRubyParser, NodeFind, RegularExpressionOptions, Relocation, Translation
Classes:
ASCIISource, BeginNode, CallNode, ClassVariableAndWriteNode, ClassVariableOperatorWriteNode, ClassVariableOrWriteNode, CodeUnitsCache, Comment, ConstantAndWriteNode, ConstantOperatorWriteNode, ConstantOrWriteNode, ConstantPathNode, ConstantPathTargetNode, ConstantReadNode, ConstantTargetNode, ConstantWriteNode, DesugarAndWriteNode, DesugarCompiler, DesugarOperatorWriteNode, DesugarOrWriteDefinedNode, DesugarOrWriteNode, EmbDocComment, GlobalVariableAndWriteNode, GlobalVariableOperatorWriteNode, GlobalVariableOrWriteNode, IfNode, ImaginaryNode, InlineComment, InstanceVariableAndWriteNode, InstanceVariableOperatorWriteNode, InstanceVariableOrWriteNode, InterpolatedMatchLastLineNode, InterpolatedRegularExpressionNode, InterpolatedStringNode, InterpolatedSymbolNode, InterpolatedXStringNode, LexCompat, LexResult, LocalVariableAndWriteNode, LocalVariableOperatorWriteNode, LocalVariableOrWriteNode, Location, MagicComment, MatchLastLineNode, Node, ParametersNode, ParenthesesNode, ParseError, ParseLexResult, ParseResult, ParseWarning, Pattern, RationalNode, RegularExpressionNode, RescueModifierNode, Result, Scope, Source, StringNode, StringQuery, Token, UnlessNode, UntilNode, WhileNode, XStringNode
Exceptions:
CurrentVersionError
Defined in: lib/prism.rb,
lib/prism/desugar_compiler.rb,
lib/prism/ffi.rb,
lib/prism/lex_compat.rb,
lib/prism/node_ext.rb,
lib/prism/node_find.rb,
lib/prism/parse_result.rb,
lib/prism/pattern.rb,
lib/prism/relocation.rb,
lib/prism/string_query.rb,
lib/prism/translation.rb,
lib/prism/parse_result/comments.rb,
lib/prism/parse_result/errors.rb,
lib/prism/parse_result/newlines.rb,
lib/prism/translation/parser.rb,
lib/prism/translation/parser_current.rb,
lib/prism/translation/parser_versions.rb,
lib/prism/translation/ripper.rb,
lib/prism/translation/ruby_parser.rb,
lib/prism/translation/parser/builder.rb,
lib/prism/translation/parser/compiler.rb,
lib/prism/translation/parser/lexer.rb,
lib/prism/translation/ripper/filter.rb,
lib/prism/translation/ripper/lexer.rb,
lib/prism/translation/ripper/sexp.rb,
prism/extension.c

Overview

The Prism Ruby parser.

“Parsing Ruby is suddenly manageable!”

- You, hopefully

Constant Summary

Class Method Summary

Class Method Details

.dump(source, **options) ⇒ String

Dump the AST corresponding to the given string to a string. For supported options, see .parse.

[ GitHub ] 

  


# File 'prism/extension.c', line 399



static VALUE
dump(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    const uint8_t *source = (const uint8_t *) RSTRING_PTR(string);
    size_t length = RSTRING_LEN(string);

#ifdef PRISM_BUILD_DEBUG
    char* dup = xmalloc(length);
    memcpy(dup, source, length);
    source = (const uint8_t *) dup;
#endif

    VALUE value = dump_input(source, length, options);
    if (pm_options_freeze(options)) rb_obj_freeze(value);

#ifdef PRISM_BUILD_DEBUG
#ifdef xfree_sized
    xfree_sized(dup, length);
#else
    xfree(dup);
#endif
#endif

    pm_options_free(options);

    return value;
}


  








  

    .dump_common(string, options)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 387



def dump_common(string, options) # :nodoc:
  LibRubyParser::PrismBuffer.with do |buffer|
    LibRubyParser.pm_serialize_parse(buffer.pointer, string.pointer, string.length, dump_options(options))

    dumped = buffer.read
    dumped.freeze if options.fetch(:freeze, false)

    dumped
  end
end


  








  

    .dump_file(filepath, **options)  ⇒ String   



  

    
Dump the AST corresponding to the given file to a string. For supported
options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 437



static VALUE
dump_file(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    VALUE value = dump_input(pm_source_source(src), pm_source_length(src), options);
    pm_source_free(src);
    pm_options_free(options);

    return value;
}


  








  

    .dump_options(options)   (private)
  



  

    

Convert the given options into a serialized options string.


  



  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 482



def dump_options(options)
  template = +""
  values = []

  template << "L"
  if (filepath = options[:filepath])
    values.push(filepath.bytesize, filepath.b)
    template << "A*"
  else
    values << 0
  end

  template << "l"
  values << options.fetch(:line, 1)

  template << "L"
  if (encoding = options[:encoding])
    name = encoding.is_a?(Encoding) ? encoding.name : encoding
    values.push(name.bytesize, name.b)
    template << "A*"
  else
    values << 0
  end

  template << "C"
  values << (options.fetch(:frozen_string_literal, false) ? 1 : 0)

  template << "C"
  values << dump_options_command_line(options)

  template << "C"
  values << dump_options_version(options[:version])

  template << "C"
  values << (options[:encoding] == false ? 1 : 0)

  template << "C"
  values << (options.fetch(:main_script, false) ? 1 : 0)

  template << "C"
  values << (options.fetch(:partial_script, false) ? 1 : 0)

  template << "C"
  values << (options.fetch(:freeze, false) ? 1 : 0)

  template << "L"
  if (scopes = options[:scopes])
    values << scopes.length

    scopes.each do |scope|
      locals = nil
      forwarding = 0

      case scope
      when Array
        locals = scope
      when Scope
        locals = scope.locals

        scope.forwarding.each do |forward|
          case forward
          when :*     then forwarding |= 0x1
          when :**    then forwarding |= 0x2
          when :&     then forwarding |= 0x4
          when :"..." then forwarding |= 0x8
          else raise ArgumentError, "invalid forwarding value: #{forward}"
          end
        end
      else
        raise TypeError, "wrong argument type #{scope.class.inspect} (expected Array or Prism::Scope)"
      end

      template << "L"
      values << locals.length

      template << "C"
      values << forwarding

      locals.each do |local|
        name = local.name
        template << "L"
        values << name.bytesize

        template << "A*"
        values << name.b
      end
    end
  else
    values << 0
  end

  values.pack(template)
end


  








  

    .dump_options_command_line(options)   (private)
  



  

    

Return the value that should be dumped for the command_line option.


  





  
Raises:


    
  
  • 
    (ArgumentError)
  
    • 





  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 429



def dump_options_command_line(options)
  command_line = options.fetch(:command_line, "")
  raise ArgumentError, "command_line must be a string" unless command_line.is_a?(String)

  command_line.each_char.inject(0) do |value, char|
    case char
    when "a" then value | 0b000001
    when "e" then value | 0b000010
    when "l" then value | 0b000100
    when "n" then value | 0b001000
    when "p" then value | 0b010000
    when "x" then value | 0b100000
    else raise ArgumentError, "invalid command_line option: #{char}"
    end
  end
end


  








  

    .dump_options_version(version)   (private)
  



  

    

Return the value that should be dumped for the version option.


  



  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 447



def dump_options_version(version)
  case version
  when "current"
    version_string_to_number(RUBY_VERSION) || raise(CurrentVersionError, RUBY_VERSION)
  when "latest", nil
    0 # Handled in pm_parser_init
  when "nearest"
    dump = version_string_to_number(RUBY_VERSION)
    return dump if dump
    if RUBY_VERSION < "3.3"
      version_string_to_number("3.3")
    else
      0 # Handled in pm_parser_init
    end
  else
    version_string_to_number(version) || raise(ArgumentError, "invalid version: #{version}")
  end
end


  








  

    .find(callable, rubyvm: !!defined?(RubyVM)))  
  



  

    

Given a Method, UnboundMethod, Proc, or Thread::Backtrace::Location, returns the Prism node representing it. On CRuby, this uses node_id for an exact match. On other implementations, it falls back to best-effort matching by source location line number.


  



  [ GitHub ]


  

  


# File 'lib/prism.rb', line 94



def self.find(callable, rubyvm: !!defined?(RubyVM))
  NodeFind.find(callable, rubyvm)
end


  








  

    .lex(source, **options)  ⇒ LexResult   



  

    
Return a ::Prism::LexResult instance that contains an array of ::Prism::Token instances
corresponding to the given string. For supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 847



static VALUE
lex(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    VALUE result = parse_lex_input((const uint8_t *) RSTRING_PTR(string), RSTRING_LEN(string), options, false);
    pm_options_free(options);

    return result;
}


  








  

    .lex_common(string, code, options)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 398



def lex_common(string, code, options) # :nodoc:
  LibRubyParser::PrismBuffer.with do |buffer|
    LibRubyParser.pm_serialize_lex(buffer.pointer, string.pointer, string.length, dump_options(options))
    Serialize.load_lex(code, buffer.read, options.fetch(:freeze, false))
  end
end


  








  

    .lex_compat(source, **options)  ⇒ LexCompat::Result   



  

    

Returns a parse result whose value is an array of tokens that closely resembles the return value of Ripper.lex.



For supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'lib/prism.rb', line 74



def self.lex_compat(source, **options)
  LexCompat.new(source, **options).result # steep:ignore
end


  








  

    .lex_file(filepath, **options)  ⇒ LexResult   



  

    
Return a ::Prism::LexResult instance that contains an array of ::Prism::Token instances
corresponding to the given file. For supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 866



static VALUE
lex_file(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    VALUE value = parse_lex_input(pm_source_source(src), pm_source_length(src), options, false);
    pm_source_free(src);
    pm_options_free(options);

    return value;
}


  








  

    .load(source, serialized, freeze)  ⇒ ParseResult   



  

    

Load the serialized AST using the source as a reference into a tree.


  



  [ GitHub ]


  

  


# File 'lib/prism.rb', line 84



def self.load(source, serialized, freeze = false)
  Serialize.load_parse(source, serialized, freeze)
end


  








  

    .parse(source, **options)  ⇒ ParseResult   



  

    
Parse the given string and return a ::Prism::ParseResult instance. The options that
are supported are:



    

  • command_line - either nil or a string of the various options that were
  set on the command line. Valid values are combinations of "a", "l",
  "n", "p", and "x".
    • 

  • encoding - the encoding of the source being parsed. This should be an
  encoding or nil.
    • 

  • filepath - the filepath of the source being parsed. This should be a
  string or nil.
    • 

  • freeze - whether or not to deeply freeze the AST. This should be a
  boolean or nil.
    • 

  • frozen_string_literal - whether or not the frozen string literal pragma
  has been set. This should be a boolean or nil.
    • 

  • line - the line number that the parse starts on. This should be an
  integer or nil. Note that this is 1-indexed.
    • 

  • main_script - a boolean indicating whether or not the source being parsed
  is the main script being run by the interpreter. This controls whether
  or not shebangs are parsed for additional flags and whether or not the
  parser will attempt to find a matching shebang if the first one does
  not contain the word "ruby".
    • 

  • partial_script - when the file being parsed is considered a "partial"
  script, jumps will not be marked as errors if they are not contained
  within loops/blocks. This is used in the case that you're parsing a
  script that you know will be embedded inside another script later, but
  you do not have that context yet. For example, when parsing an ERB
  template that will be evaluated inside another script.
    • 

  • scopes - the locals that are in scope surrounding the code that is being
  parsed. This should be an array of arrays of symbols or nil. Scopes are
  ordered from the outermost scope to the innermost one.
    • 

  • version - the version of Ruby syntax that prism should used to parse Ruby
  code. By default prism assumes you want to parse with the latest
  version of Ruby syntax (which you can trigger with nil or
  "latest"). You may also restrict the syntax to a specific version of
  Ruby, e.g., with "3.3.0". To parse with the same syntax version that
  the current Ruby is running use version: "current". To parse with the
  nearest version to the current Ruby that is running, use
  version: "nearest". Raises ArgumentError if the version is not
  currently supported by Prism.
    • 



  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 955



static VALUE
parse(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    const uint8_t *source = (const uint8_t *) RSTRING_PTR(string);
    size_t length = RSTRING_LEN(string);

#ifdef PRISM_BUILD_DEBUG
    char* dup = xmalloc(length);
    memcpy(dup, source, length);
    source = (const uint8_t *) dup;
#endif

    VALUE value = parse_input(source, length, options);

#ifdef PRISM_BUILD_DEBUG
#ifdef xfree_sized
    xfree_sized(dup, length);
#else
    xfree(dup);
#endif
#endif

    pm_options_free(options);
    return value;
}


  








  

    .parse_comments(source, **options)  ⇒ Array   



  

    
Parse the given string and return an array of ::Prism::Comment objects. For supported
options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1154



static VALUE
parse_comments(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    VALUE result = parse_input_comments((const uint8_t *) RSTRING_PTR(string), RSTRING_LEN(string), options);
    pm_options_free(options);

    return result;
}


  








  

    .parse_comments_common(string, code, options)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 410



def parse_comments_common(string, code, options) # :nodoc:
  LibRubyParser::PrismBuffer.with do |buffer|
    LibRubyParser.pm_serialize_parse_comments(buffer.pointer, string.pointer, string.length, dump_options(options))
    Serialize.load_parse_comments(code, buffer.read, options.fetch(:freeze, false))
  end
end


  








  

    .parse_common(string, code, options)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 405



def parse_common(string, code, options) # :nodoc:
  serialized = dump_common(string, options)
  Serialize.load_parse(code, serialized, options.fetch(:freeze, false))
end


  








  

    .parse_failure?(source, **options)  ⇒ Boolean   



  

    
Parse the given string and return true if it parses with errors. For
supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1286



static VALUE
parse_failure_p(int argc, VALUE *argv, VALUE self) {
    return RTEST(parse_success_p(argc, argv, self)) ? Qfalse : Qtrue;
}


  








  

    .parse_file(filepath, **options)  
  



  

    

Mirror the parse_file API by using the serialization API. This uses native strings instead of Ruby strings because it allows us to use mmap when it is available.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 991



static VALUE
parse_file(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    VALUE value = parse_input(pm_source_source(src), pm_source_length(src), options);
    pm_source_free(src);
    pm_options_free(options);

    return value;
}


  








  

    .parse_file_comments(filepath, **options)  
  



  

    

Mirror the parse_file_comments API by using the serialization API. This uses native strings instead of Ruby strings because it allows us to use mmap when it is available.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1173



static VALUE
parse_file_comments(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    VALUE value = parse_input_comments(pm_source_source(src), pm_source_length(src), options);
    pm_source_free(src);
    pm_options_free(options);

    return value;
}


  








  

    .parse_file_failure?(filepath, **options)  ⇒ Boolean   



  

    
Parse the given file and return true if it parses with errors. For
supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1321



static VALUE
parse_file_failure_p(int argc, VALUE *argv, VALUE self) {
    return RTEST(parse_file_success_p(argc, argv, self)) ? Qfalse : Qtrue;
}


  








  

    .parse_file_success?(filepath, **options)  ⇒ Boolean   



  

    
Parse the given file and return true if it parses without errors. For
supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1299



static VALUE
parse_file_success_p(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    VALUE result = parse_input_success_p(pm_source_source(src), pm_source_length(src), options);
    pm_source_free(src);
    pm_options_free(options);

    return result;
}


  








  

    .parse_file_success_common(string, options)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 424



def parse_file_success_common(string, options) # :nodoc:
  LibRubyParser.pm_serialize_parse_success_p(string.pointer, string.length, dump_options(options))
end


  








  

    .parse_lex(source, **options)  ⇒ ParseLexResult   



  

    
Parse the given string and return a ::Prism::ParseLexResult instance that contains a
2-element array, where the first element is the AST and the second element is
an array of ::Prism::Token instances.



This API is only meant to be used in the case where you need both the AST and
the tokens. If you only need one or the other, use either .parse or
.lex.



For supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1202



static VALUE
parse_lex(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    VALUE value = parse_lex_input((const uint8_t *) RSTRING_PTR(string), RSTRING_LEN(string), options, true);
    pm_options_free(options);

    return value;
}


  








  

    .parse_lex_common(string, code, options)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 417



def parse_lex_common(string, code, options) # :nodoc:
  LibRubyParser::PrismBuffer.with do |buffer|
    LibRubyParser.pm_serialize_parse_lex(buffer.pointer, string.pointer, string.length, dump_options(options))
    Serialize.load_parse_lex(code, buffer.read, options.fetch(:freeze, false))
  end
end


  








  

    .parse_lex_file(filepath, **options)  ⇒ ParseLexResult   



  

    
Parse the given file and return a ::Prism::ParseLexResult instance that contains a
2-element array, where the first element is the AST and the second element is
an array of ::Prism::Token instances.



This API is only meant to be used in the case where you need both the AST and
the tokens. If you only need one or the other, use either .parse_file
or .lex_file.



For supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1228



static VALUE
parse_lex_file(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    VALUE value = parse_lex_input(pm_source_source(src), pm_source_length(src), options, true);
    pm_source_free(src);
    pm_options_free(options);

    return value;
}


  








  

    .parse_stream(stream, **options)  ⇒ ParseResult   



  

    
Parse the given object that responds to gets and return a ::Prism::ParseResult
instance. The options that are supported are the same as .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1098



static VALUE
parse_stream(int argc, VALUE *argv, VALUE self) {
    VALUE stream;
    VALUE keywords;
    rb_scan_args(argc, argv, "1:", &stream, &keywords);

    pm_options_t *options = pm_options_new();
    extract_options(options, Qnil, keywords);

    pm_source_t *src = pm_source_stream_new((void *) stream, parse_stream_fgets, parse_stream_eof);
    pm_arena_t *arena = pm_arena_new();
    pm_parser_t *parser;

    pm_node_t *node = pm_parse_stream(&parser, arena, src, options);
    rb_encoding *encoding = rb_enc_find(pm_parser_encoding_name(parser));

    VALUE source = pm_source_new(parser, encoding, pm_options_freeze(options));
    VALUE value = pm_ast_new(parser, node, encoding, source, pm_options_freeze(options));
    VALUE result = parse_result_create(rb_cPrismParseResult, parser, value, encoding, source, pm_options_freeze(options));

    pm_source_free(src);
    pm_parser_free(parser);
    pm_arena_free(arena);
    pm_options_free(options);

    return result;
}


  








  

    .parse_success?(source, **options)  ⇒ Boolean   



  

    
Parse the given string and return true if it parses without errors. For
supported options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1267



static VALUE
parse_success_p(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    VALUE result = parse_input_success_p((const uint8_t *) RSTRING_PTR(string), RSTRING_LEN(string), options);
    pm_options_free(options);

    return result;
}


  








  

    .profile(source, **options)  ⇒ nil   



  

    
Parse the given string and return nothing. This method is meant to allow
profilers to avoid the overhead of reifying the AST to Ruby. For supported
options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1027



static VALUE
profile(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();
    VALUE string = string_options(argc, argv, options);

    profile_input((const uint8_t *) RSTRING_PTR(string), RSTRING_LEN(string), options);
    pm_options_free(options);

    return Qnil;
}


  








  

    .profile_file(filepath, **options)  ⇒ nil   



  

    
Parse the given file and return nothing. This method is meant to allow
profilers to avoid the overhead of reifying the AST to Ruby. For supported
options, see .parse.


  



  [ GitHub ]


  

  


# File 'prism/extension.c', line 1047



static VALUE
profile_file(int argc, VALUE *argv, VALUE self) {
    pm_options_t *options = pm_options_new();

    VALUE encoded_filepath;
    pm_source_t *src = file_options(argc, argv, options, &encoded_filepath);

    profile_input(pm_source_source(src), pm_source_length(src), options);
    pm_source_free(src);
    pm_options_free(options);

    return Qnil;
}


  








  

    .scope(locals: [], forwarding: [])  
  



  

    

Create a new scope with the given locals and forwarding options that is suitable for passing into one of the Prism.* methods that accepts the scopes option.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 1194



def self.scope(locals: [], forwarding: [])
  Scope.new(locals, forwarding)
end


  








  

    .version_string_to_number(version)   (private)
  



  

    

Converts a version string like “4.0.0” or “4.0” into a number. Returns nil if the version is unknown.


  



  [ GitHub ]


  

  


# File 'lib/prism/ffi.rb', line 468



def version_string_to_number(version)
  case version
  when /\A3\.3(\.\d+)?\z/
    1
  when /\A3\.4(\.\d+)?\z/
    2
  when /\A3\.5(\.\d+)?\z/, /\A4\.0(\.\d+)?\z/
    3
  when /\A4\.1(\.\d+)?\z/
    4
  end
end