Class: RDL::Type::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/rdl/types/lexer.rex.rb,
lib/rdl/types/parser.tab.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 = 
[
"$end",
"error",
"COMMA",
"RARROW",
"OR",
"HASH_TYPE",
"HASH_QUERY",
"CONST_BEGIN",
"RASSOC",
"FIXNUM",
"FLOAT",
"COLON",
"DOT",
"DOTS",
"ID",
"SYMBOL",
"SPECIAL_ID",
"STRING",
"PREDICATE",
"LPAREN",
"RPAREN",
"LBRACE",
"RBRACE",
"LBRACKET",
"RBRACKET",
"QUERY",
"BANG",
"STARSTAR",
"STAR",
"LESS",
"GREATER",
"EOF",
"$start",
"entry",
"method_type",
"bare_type",
"query_type",
"type_expr",
"arg_list",
"block",
"method_sig_list",
"nonempty_arg_list",
"named_arg_list",
"arg",
"base_arg",
"named_arg",
"base_arg_query_only",
"union_type",
"type_expr_comma_list",
"hash_expr",
"hash_expr_comma_list",
"single_type" ]
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/rdl/types/lexer.rex.rb', line 15

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/rdl/types/lexer.rex.rb', line 14

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/rdl/types/lexer.rex.rb', line 16

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/rdl/types/lexer.rex.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(/\s/))
      ;

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

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

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

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

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

    when (text = @ss.scan(/\{\{(?:(?!}}).)+\}\}/))
       action { [:PREDICATE, text[2..-3]] }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    when (text = @ss.scan(/-?\d\.\d+/))
       action { [:FLOAT, text] } # Must go before FIXNUM

    when (text = @ss.scan(/-?(\d)+/))
       action { [:FIXNUM, text] }

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

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

    when (text = @ss.scan(/\:/))
       action { [:COLON, text] } # Must come after SYMBOL

    when (text = @ss.scan(/%\w+/))
       action { [:SPECIAL_ID, text] }

    when (text = @ss.scan(/'[^']*'/))
       action { [:STRING, text.gsub("'", "")] }

    when (text = @ss.scan(/"[^"]*"/))
       action { [:STRING, text.gsub('"', "")] }

    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/rdl/types/parser.tab.rb', line 805

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

#action ⇒ Object 



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# File 'lib/rdl/types/lexer.rex.rb', line 24

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/rdl/types/lexer.rex.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/rdl/types/lexer.rex.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/rdl/types/lexer.rex.rb', line 41

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/rdl/types/lexer.rex.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/rdl/types/lexer.rex.rb', line 28

def scan_str(str)
  scan_setup(str)
  do_parse
end