Class: GherkinRuby::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/gherkin_ruby/parser/lexer.rb,
lib/gherkin_ruby/parser/parser.rb

Overview

Compile with: rex gherkin.rex -o lexer.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 = 
[
"$end",
"error",
"NEWLINE",
"FEATURE",
"BACKGROUND",
"SCENARIO",
"TAG",
"GIVEN",
"WHEN",
"THEN",
"AND",
"BUT",
"TEXT",
"$start",
"Root",
"Feature",
"Scenarios",
"FeatureTags",
"Newline",
"Tags",
"FeatureHeader",
"Background",
"FeatureName",
"Description",
"BackgroundHeader",
"Steps",
"Step",
"Keyword",
"Scenario" ]
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/gherkin_ruby/parser/lexer.rb', line 16

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 15

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 17

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 56

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/[ \t]+/))
      ;

    when (text = @ss.scan(/\#.*$/))
      ;

    when (text = @ss.scan(/\n/))
       action { [:NEWLINE, text] }

    when (text = @ss.scan(/Feature:/))
       action { [:FEATURE, text[0..-2]] }

    when (text = @ss.scan(/Background:/))
       action { [:BACKGROUND, text[0..-2]] }

    when (text = @ss.scan(/Scenario:/))
       action { [:SCENARIO, text[0..-2]] }

    when (text = @ss.scan(/@(\w|-)+/))
       action { [:TAG, text[1..-1]] }

    when (text = @ss.scan(/Given/))
       action { [:GIVEN, text] }

    when (text = @ss.scan(/When/))
       action { [:WHEN, text] }

    when (text = @ss.scan(/Then/))
       action { [:THEN, text] }

    when (text = @ss.scan(/And/))
       action { [:AND, text] }

    when (text = @ss.scan(/But/))
       action { [:BUT, text] }

    when (text = @ss.scan(/[^#\n]*/))
       action { [:TEXT, text.strip] }

    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

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/gherkin_ruby/parser/parser.rb', line 398

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

#action ⇒ Object 



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 25

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 35

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/gherkin_ruby/parser/lexer.rb', line 48

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/gherkin_ruby/parser/lexer.rb', line 42

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 19

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/gherkin_ruby/parser/lexer.rb', line 29

def scan_str(str)
  scan_setup(str)
  do_parse
end

#tokenize(code) ⇒ Object

def _next_token



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# File 'lib/gherkin_ruby/parser/lexer.rb', line 112

def tokenize(code)
  scan_setup(code)
  tokens = []
  while token = next_token
    tokens << token
  end
  tokens
end