Class: Rack::Mount::StrexpParser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/rack/mount/strexp/parser.rb,
lib/rack/mount/strexp/tokenizer.rb

Defined Under Namespace

Classes: ScanError

Constant Summary collapse

REGEXP_NAMED_CAPTURE = 
'(?:<%s>%s)'.freeze
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 = 
[
"$end",
"error",
"PARAM",
"GLOB",
"LPAREN",
"RPAREN",
"CHAR",
"$start",
"target",
"expr",
"token" ]
Racc_debug_parser = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#anchor ⇒ Object

Returns the value of attribute anchor.



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# File 'lib/rack/mount/strexp/parser.rb', line 23

def anchor
  @anchor
end

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 14

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 13

def lineno
  @lineno
end

#requirements ⇒ Object

Returns the value of attribute requirements.



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# File 'lib/rack/mount/strexp/parser.rb', line 23

def requirements
  @requirements
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 15

def state
  @state
end

Instance Method Details

#_reduce_1(val, _values, result) ⇒ Object

reduce 0 omitted



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# File 'lib/rack/mount/strexp/parser.rb', line 116

def _reduce_1(val, _values, result)
 result = anchor ? "\\A#{val.join}\\Z" : "\\A#{val.join}" 
    result
end

#_reduce_2(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/strexp/parser.rb', line 121

def _reduce_2(val, _values, result)
 result = val.join 
    result
end

#_reduce_4(val, _values, result) ⇒ Object

reduce 3 omitted



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# File 'lib/rack/mount/strexp/parser.rb', line 128

def _reduce_4(val, _values, result)
           name = val[0].to_sym
           requirement = requirements[name]
           result = REGEXP_NAMED_CAPTURE % [name, requirement]
         
    result
end

#_reduce_5(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/strexp/parser.rb', line 136

def _reduce_5(val, _values, result)
           name = val[0].to_sym
           requirement = requirements.key?(name) ? requirements[name] : '.+'
           result = REGEXP_NAMED_CAPTURE % [name, requirement]
         
    result
end

#_reduce_6(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/strexp/parser.rb', line 144

def _reduce_6(val, _values, result)
 result = "(?:#{val[1]})?" 
    result
end

#_reduce_7(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/strexp/parser.rb', line 149

def _reduce_7(val, _values, result)
 result = Regexp.escape(val[0]) 
    result
end

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/strexp/parser.rb', line 154

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

#action ⇒ Object 



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 23

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 33

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/rack/mount/strexp/tokenizer.rb', line 46

def next_token
  return if @ss.eos?

  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/\\(\(|\)|:|\*)/))
       action { [:CHAR,  @ss[1]] }

    when (text = @ss.scan(/\:([a-zA-Z_]\w*)/))
       action { [:PARAM, @ss[1]] }

    when (text = @ss.scan(/\*([a-zA-Z_]\w*)/))
       action { [:GLOB,  @ss[1]] }

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

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

    when (text = @ss.scan(/./))
       action { [:CHAR,   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

#scan_file(filename) ⇒ Object 



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 40

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/rack/mount/strexp/tokenizer.rb', line 17

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/rack/mount/strexp/tokenizer.rb', line 27

def scan_str(str)
  scan_setup(str)
  do_parse
end