Class: SystemRDL::Parser::Scanner

Inherits:
Object
  • Object
show all
Includes:
RaiseParseError
Defined in:
lib/systemrdl/parser/scanner.rb

Constant Summary collapse

WHITE_SPACES = 
/[ \t\n\r]+/
LINE_COMMENT = 
%r{//.*$}
BLOCK_COMMENT = 
%r{/\*(?:(?!\*/).)*\*/}m
UNTERMINATED_BLOCK_COMMENT = 
%r{/\*(?:(?!\*/).)*}m
KEYWORDS = 
keyword_patterns
SYMBOLS = 
symbol_patterns
VERILOG_BIN_NUMBER = 
/(\d+)'[bB]([01][01_]*)/
VERILOG_DEC_NUMBER = 
/(\d+)'[dD](\d[\d_]*)/
VERILOG_HEX_NUMBER = 
/(\d+)'[hH](\h[\h_]*)/
DEC_NUMBER = 
/\d[\d_]*/
HEX_NUMBER = 
/0[xX]\h[\h_]*/
NUMBERS = 
{
  VERILOG_HEX_NUMBER => :VERILOG_NUMBER,
  VERILOG_DEC_NUMBER => :VERILOG_NUMBER,
  VERILOG_BIN_NUMBER => :VERILOG_NUMBER,
  HEX_NUMBER => :NUMBER,
  DEC_NUMBER => :NUMBER
}.freeze

Instance Method Summary collapse

Constructor Details

#initialize(code, filename, test) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/systemrdl/parser/scanner.rb', line 69

def initialize(code, filename, test)
  @ss = StringScanner.new(code)
  @filename = filename
  @line = 1
  @column = 1
  @control_tokens = []
  @control_tokens << create_test_token(test) if test
end

Instance Method Details

#next_token ⇒ Object 



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# File 'lib/systemrdl/parser/scanner.rb', line 78

def next_token
  if @control_tokens.empty?
    skip_blank
    push_eos_tokens if eos?
  end

  token =
    if @control_tokens.empty?
      scan_next_token
    else
      @control_tokens.shift
    end
  token && [token.kind, token]
end