Class: CSSPool::CSS::Tokenizer

Inherits:
Parser
  • Object
show all
Defined in:
lib/csspool/css/tokenizer.rb

Direct Known Subclasses

SAC::Parser

Defined Under Namespace

Classes: ScanError

Constant Summary

Constants inherited from Parser

Parser::Racc_arg, Parser::Racc_debug_parser, Parser::Racc_token_to_s_table

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Parser

#_reduce_none

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/csspool/css/tokenizer.rb', line 15

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/csspool/css/tokenizer.rb', line 14

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/csspool/css/tokenizer.rb', line 16

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/csspool/css/tokenizer.rb', line 55

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/url\([\s]*("([^\n\r\f\\"]|\\\n|\r\n|\r|\f|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*"|'([^\n\r\f\\']|\\\n|\r\n|\r|\f|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*')[\s]*\)/i))
       action { [:URI, st(text)] }

    when (text = @ss.scan(/url\([\s]*([!#\$%&*-~]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*[\s]*\)/i))
       action { [:URI, st(text)] }

    when (text = @ss.scan(/U\+[0-9a-fA-F?]{1,6}(-[0-9a-fA-F]{1,6})?/i))
       action {[:UNICODE_RANGE, st(text)] }

    when (text = @ss.scan(/[\s]*\/\*(.|[\s]*)*?\*\/[\s]*/i))
       action { next_token }

    when (text = @ss.scan(/[-@]?([_A-Za-z]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])([_A-Za-z0-9-]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f]|[.])*\(\s*/i))
       action { [:FUNCTION, st(text)] }

    when (text = @ss.scan(/[\s]*@import[\s]*/i))
       action { [:IMPORT_SYM, st(text)] }

    when (text = @ss.scan(/[\s]*@page[\s]*/i))
       action { [:PAGE_SYM, st(text)] }

    when (text = @ss.scan(/[\s]*@charset[\s]*/i))
       action { [:CHARSET_SYM, st(text)] }

    when (text = @ss.scan(/[\s]*@media[\s]*/i))
       action { [:MEDIA_SYM, st(text)] }

    when (text = @ss.scan(/[\s]*!([\s]*|[\s]*\/\*(.|[\s]*)*?\*\/[\s]*)important[\s]*/i))
       action { [:IMPORTANT_SYM, st(text)] }

    when (text = @ss.scan(/[-@]?([_A-Za-z]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])([_A-Za-z0-9-]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*/i))
       action { [:IDENT, st(text)] }

    when (text = @ss.scan(/\#([_A-Za-z0-9-]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])+/i))
       action { [:HASH, st(text)] }

    when (text = @ss.scan(/[\s]*~=[\s]*/i))
       action { [:INCLUDES, st(text)] }

    when (text = @ss.scan(/[\s]*\|=[\s]*/i))
       action { [:DASHMATCH, st(text)] }

    when (text = @ss.scan(/[\s]*\^=[\s]*/i))
       action { [:PREFIXMATCH, st(text)] }

    when (text = @ss.scan(/[\s]*\$=[\s]*/i))
       action { [:SUFFIXMATCH, st(text)] }

    when (text = @ss.scan(/[\s]*\*=[\s]*/i))
       action { [:SUBSTRINGMATCH, st(text)] }

    when (text = @ss.scan(/[\s]*!=[\s]*/i))
       action { [:NOT_EQUAL, st(text)] }

    when (text = @ss.scan(/[\s]*=[\s]*/i))
       action { [:EQUAL, st(text)] }

    when (text = @ss.scan(/[\s]*\)/i))
       action { [:RPAREN, st(text)] }

    when (text = @ss.scan(/[\s]*\([\s]*/i))
       action { [:LPAREN, st(text)] }

    when (text = @ss.scan(/\[[\s]*/i))
       action { [:LSQUARE, st(text)] }

    when (text = @ss.scan(/[\s]*\]/i))
       action { [:RSQUARE, st(text)] }

    when (text = @ss.scan(/[\s]*\+[\s]*/i))
       action { [:PLUS, st(text)] }

    when (text = @ss.scan(/[\s]*\{[\s]*/i))
       action { [:LBRACE, st(text)] }

    when (text = @ss.scan(/[\s]*\}[\s]*/i))
       action { [:RBRACE, st(text)] }

    when (text = @ss.scan(/[\s]*>[\s]*/i))
       action { [:GREATER, st(text)] }

    when (text = @ss.scan(/[\s]*,[\s]*/i))
       action { [:COMMA, st(',')] }

    when (text = @ss.scan(/[\s]*;[\s]*/i))
       action { [:SEMI, st(';')] }

    when (text = @ss.scan(/\*/i))
       action { [:STAR, st(text)] }

    when (text = @ss.scan(/[\s]*~[\s]*/i))
       action { [:TILDE, st(text)] }

    when (text = @ss.scan(/\:not\([\s]*/i))
       action { [:NOT, st(text)]  }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)em[\s]*/i))
       action { [:EMS, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)ex[\s]*/i))
       action { [:EXS, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)(px|cm|mm|in|pt|pc)[\s]*/i))
       action { [:LENGTH, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)(deg|rad|grad)[\s]*/i))
       action { [:ANGLE, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)(ms|s)[\s]*/i))
       action { [:TIME, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)[k]?hz[\s]*/i))
       action { [:FREQ, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)%[\s]*/i))
       action { [:PERCENTAGE, st(text)] }

    when (text = @ss.scan(/[\s]*([0-9]*\.[0-9]+|[0-9]+)[\s]*/i))
       action { [:NUMBER, st(text)] }

    when (text = @ss.scan(/[\s]*\/\/[\s]*/i))
       action { [:DOUBLESLASH, st(text)] }

    when (text = @ss.scan(/[\s]*\/[\s]*/i))
       action { [:SLASH, st('/')] }

    when (text = @ss.scan(/<!--/i))
       action { [:CDO, st(text)] }

    when (text = @ss.scan(/-->/i))
       action { [:CDC, st(text)] }

    when (text = @ss.scan(/[\s]*\-(?![-@]?([_A-Za-z]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])([_A-Za-z0-9-]|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*)[\s]*/i))
       action { [:MINUS, st(text)] }

    when (text = @ss.scan(/[\s]*\+[\s]*/i))
       action { [:PLUS, st(text)] }

    when (text = @ss.scan(/[\s]+/i))
       action { [:S, st(text)] }

    when (text = @ss.scan(/("([^\n\r\f\\"]|\\\n|\r\n|\r|\f|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*"|'([^\n\r\f\\']|\\\n|\r\n|\r|\f|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*')/i))
       action { [:STRING, st(text)] }

    when (text = @ss.scan(/("([^\n\r\f\\"]|\\\n|\r\n|\r|\f|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*|'([^\n\r\f\\']|\\\n|\r\n|\r|\f|[^\0-\177]|\\[0-9A-Fa-f]{1,6}(\r\n|[\s])?|\\[^\n\r\f0-9A-Fa-f])*)/i))
       action { [:INVALID, st(text)] }

    when (text = @ss.scan(/./i))
       action { [st(text), st(text)] }

    else
      text = @ss.string[@ss.pos .. -1]
      raise  ScanError, "can not match: '" + text + "'"
    end  # if

  else
    raise  ScanError, "undefined state: '" + state.to_s + "'"
  end  # case state
  token
end

#action ⇒ Object 



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# File 'lib/csspool/css/tokenizer.rb', line 24

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/csspool/css/tokenizer.rb', line 34

def load_file( filename )
  @filename = filename
  open(filename, "r") do |f|
    scan_setup(f.read)
  end
end

#next_token ⇒ Object 



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# File 'lib/csspool/css/tokenizer.rb', line 47

def next_token
  return if @ss.eos?
  
  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#scan_file(filename) ⇒ Object 



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# File 'lib/csspool/css/tokenizer.rb', line 41

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/csspool/css/tokenizer.rb', line 18

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



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# File 'lib/csspool/css/tokenizer.rb', line 28

def scan_str(str)
  scan_setup(str)
  do_parse
end

#st(o) ⇒ Object

def _next_token



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# File 'lib/csspool/css/tokenizer.rb', line 222

def st o
  @st ||= Hash.new { |h,k| h[k] = k }
  @st[o]
end