Class: CodeRay::Scanners::Java

Inherits:
Scanner
  • Object
show all
Includes:
CodeRay::Streamable
Defined in:
lib/coderay/scanners/java.rb

Direct Known Subclasses

Groovy

Defined Under Namespace

Modules: BuiltinTypes

Constant Summary collapse

KEYWORDS =

TODO: Check this!

%w[
  break case catch continue default do else
  false finally for if instanceof new null
  return switch throw true try typeof while
  debugger export import package
]
MAGIC_VARIABLES = 
%w[ this super ]
TYPES = 
%w[
  boolean byte char class interface double enum float String int long short void
] << '[]'
DIRECTIVES = 
%w[
  abstract extends final implements native private protected public
  static strictfp synchronized threadsafe throws transient volatile
]
IDENT_KIND =

Reserved for future use.

WordList.new(:ident).
add(KEYWORDS, :keyword).
add(MAGIC_VARIABLES, :local_variable).
add(TYPES, :type).
add(BuiltinTypes::List, :pre_type).
add(DIRECTIVES, :directive)
ESCAPE = 
/ [bfnrtv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x
UNICODE_ESCAPE = 
/ u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x
STRING_CONTENT_PATTERN = 
{
  "'" => /[^\\']+/,
  '"' => /[^\\"]+/,
  '/' => /[^\\\/]+/,
}
IDENT = 
/[a-zA-Z_][A-Za-z_0-9]*/

Constants inherited from Scanner

Scanner::DEFAULT_OPTIONS, Scanner::ScanError

Instance Method Summary collapse

Methods inherited from Scanner

#column, #each, file_extension, #initialize, #line, normify, #reset, streamable?, #streaming?, #string=, #tokenize, #tokens

Methods included from Plugin

#helper, #included, #plugin_host, #plugin_id, #register_for, #title

Constructor Details

This class inherits a constructor from CodeRay::Scanners::Scanner

Instance Method Details

#scan_tokens(tokens, options) ⇒ Object 



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# File 'lib/coderay/scanners/java.rb', line 45

def scan_tokens tokens, options

  state = :initial
  string_delimiter = nil
  import_clause = class_name_follows = last_token_dot = false

  until eos?

    kind = nil
    match = nil
    
    case state

    when :initial

      if match = scan(/ \s+ | \\\n /x)
        tokens << [match, :space]
        next
      
      elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
        tokens << [match, :comment]
        next
      
      elsif import_clause && scan(/ #{IDENT} (?: \. #{IDENT} )* /ox)
        kind = :include
      
      elsif match = scan(/ #{IDENT} | \[\] /ox)
        kind = IDENT_KIND[match]
        if last_token_dot
          kind = :ident
        elsif class_name_follows
          kind = :class
          class_name_follows = false
        else
          import_clause = true if match == 'import'
          class_name_follows = true if match == 'class' || match == 'interface'
        end
      
      elsif scan(/ \.(?!\d) | [,?:()\[\]}] | -- | \+\+ | && | \|\| | \*\*=? | [-+*\/%^~&|<>=!]=? | <<<?=? | >>>?=? /x)
        kind = :operator
      
      elsif scan(/;/)
        import_clause = false
        kind = :operator
      
      elsif scan(/\{/)
        class_name_follows = false
        kind = :operator
      
      elsif check(/[\d.]/)
        if scan(/0[xX][0-9A-Fa-f]+/)
          kind = :hex
        elsif scan(/(?>0[0-7]+)(?![89.eEfF])/)
          kind = :oct
        elsif scan(/\d+[fFdD]|\d*\.\d+(?:[eE][+-]?\d+)?[fFdD]?|\d+[eE][+-]?\d+[fFdD]?/)
          kind = :float
        elsif scan(/\d+[lL]?/)
          kind = :integer
        end

      elsif match = scan(/["']/)
        tokens << [:open, :string]
        state = :string
        string_delimiter = match
        kind = :delimiter

      elsif scan(/ @ #{IDENT} /ox)
        kind = :annotation

      else
        getch
        kind = :error

      end

    when :string
      if scan(STRING_CONTENT_PATTERN[string_delimiter])
        kind = :content
      elsif match = scan(/["'\/]/)
        tokens << [match, :delimiter]
        tokens << [:close, state]
        string_delimiter = nil
        state = :initial
        next
      elsif state == :string && (match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox))
        if string_delimiter == "'" && !(match == "\\\\" || match == "\\'")
          kind = :content
        else
          kind = :char
        end
      elsif scan(/\\./m)
        kind = :content
      elsif scan(/ \\ | $ /x)
        tokens << [:close, :delimiter]
        kind = :error
        state = :initial
      else
        raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
      end

    else
      raise_inspect 'Unknown state', tokens

    end

    match ||= matched
    if $DEBUG and not kind
      raise_inspect 'Error token %p in line %d' %
        [[match, kind], line], tokens
    end
    raise_inspect 'Empty token', tokens unless match
    
    last_token_dot = match == '.'
    
    tokens << [match, kind]

  end

  if state == :string
    tokens << [:close, state]
  end

  tokens
end