Module: LangScan::JavaScript

Defined in:
lib/langscan/javascript.rb,
ext/langscan/javascript/javascript/javascript.c

Defined Under Namespace

Classes: Tokenizer

Constant Summary collapse

Keywords = 
%w(
  break else new var
  case finally return void
  catch for switch while
  continue function this with
  default if throw
  delete in try
  do instanceof typeof
  null true false
)
KeywordsHash = 
{}
Types = 
[]
TypesHash = 
{}
IdentType = 
Hash.new(:ident)

Class Method Summary collapse

Class Method Details

.abbrev ⇒ Object 



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# File 'lib/langscan/javascript.rb', line 24

def abbrev
  "js"
end

.extnames ⇒ Object 



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# File 'lib/langscan/javascript.rb', line 28

def extnames
  [".js"]
end

.name ⇒ Object 



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# File 'lib/langscan/javascript.rb', line 20

def name
  "JavaScript"
end

.scan(input, &block) ⇒ Object

LangScan::JavaScript.scan iterates over JavaScript program. It yields for each Fragment.



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# File 'lib/langscan/javascript.rb', line 34

def scan(input, &block)
  sorter = PairMatcher.fragmentsorter(block)
  scan_unsorted(input, &sorter)
end

.scan_unsorted(input, &block) ⇒ Object 



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# File 'lib/langscan/javascript.rb', line 39

def scan_unsorted(input, &block)
  pm = LangScan::PairMatcher.new(1,0,0,1)
  pm.define_intertoken_fragment :space, nil
  pm.define_intertoken_fragment :comment, nil
  pm.define_pair :paren, :punct, "(", :punct, ")"
  pm.define_pair :brace, :punct, "{", :punct, "}"
  pm.define_pair :bracket, :punct, "[", :punct, "]"
  pm.parse(LangScan::JavaScript::Tokenizer.new(input), lambda {|f|
    if f.type == :ident
      f.type = IdentType[f.text]
    end
    yield f
  }) {|pair|
    if pair.pair_type == :paren &&
       1 <= pair.before_open_length &&
       pair.around_open(-1).type == :ident && IdentType[pair.around_open(-1).text] == :ident
      before_open_token = pair.around_open(-1)
      if !KeywordsHash[before_open_token.text]
        if !(outer = pair.outer) || !outer.outer
          if 1 <= pair.after_close_length &&
             pair.around_close(1).type == :punct &&
             pair.around_close(1).text == '{'
            before_open_token.type = :fundef
          else
            before_open_token.type = :funcall
          end
        else
          before_open_token.type = :funcall
        end
      end
    end
  }
end