Class: EsiAttributeLanguage::SimpleGrammarParser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/esi_attribute_language/grammar/simple.y.rb,
lib/esi_attribute_language/grammar/simple.rex.rb

Defined Under Namespace

Classes: ScanError

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
"$end",
"error",
"DOLLAR",
"LPAREN",
"RPAREN",
"STRING",
"VARIABLE",
"OTHER",
"PIPE",
"LBRACE",
"RBRACE",
"QUOTE",
"$start",
"expression",
"variable" ]
Racc_debug_parser = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 14

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 13

def lineno
  @lineno
end

Instance Method Details

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.y.rb', line 162

def _reduce_none(val, _values, result)
  val[0]
end

#action(&block) ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 18

def action &block
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 27

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

#next_token ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 39

def next_token
  @rex_tokens.shift
end

#scan_evaluate(str) ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 43

def scan_evaluate( str )
  scan_setup
  @rex_tokens = []
  @lineno  =  1
  ss = StringScanner.new(str)
  state = nil
  until ss.eos?
    text = ss.peek(1)
    @lineno  +=  1  if text == "\n"
    case state
    when nil
      case
      when (text = ss.scan(/\{/))
         @rex_tokens.push action { [:LBRACE,    text] }

      when (text = ss.scan(/\}/))
         @rex_tokens.push action { [:RBRACE,    text] }

      when (text = ss.scan(/\$/))
         @rex_tokens.push action { [:DOLLAR,    text] }

      when (text = ss.scan(/\|/))
         @rex_tokens.push action { [:PIPE,      text] }

      when (text = ss.scan(/\(/))
         @rex_tokens.push action { [:LPAREN,    text] }

      when (text = ss.scan(/\)/))
         @rex_tokens.push action { [:RPAREN,    text] }

      when (text = ss.scan(/[0-9]+/))
         @rex_tokens.push action { [:NUMBER,    text] }

      when (text = ss.scan(/'(\\'|[^'])*'/))
         @rex_tokens.push action { [:OTHER,     text] }

      when (text = ss.scan(/(\\\|\\\$|\\\[|\\\]|\\\)|[^\|\(\)\$\{\}]{1})*/))
         @rex_tokens.push action { [:OTHER,     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
  end  # until ss
end

#scan_file(filename) ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 34

def scan_file( filename )
  load_file  filename
  do_parse
end

#scan_setup ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 16

def scan_setup ; end

#scan_str(str) ⇒ Object 



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# File 'lib/esi_attribute_language/grammar/simple.rex.rb', line 22

def scan_str( str )
  scan_evaluate  str
  do_parse
end