Class: RBF::Parser

Inherits:
Parslet::Parser
  • Object
show all
Defined in:
lib/rbf/parser.rb

Class Method Summary collapse

Class Method Details

.syntax(keys) ⇒ Object 



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# File 'lib/rbf/parser.rb', line 19

def self.syntax (keys)
  klass = self.clone
  
  klass.class_eval {
    rule(:forward)  { str(keys[:forward]).as(?>) }
    rule(:backward) { str(keys[:backward]).as(?<) }

    rule(:increase) { str(keys[:increase]).as(?+) }
    rule(:decrease) { str(keys[:decrease]).as(?-) }

    rule(:output) { str(keys[:output]).as(?.) }
    rule(:input)  { str(keys[:input]).as(?,) }

    rule(:while_start) { str(keys[:while_start]) }
    rule(:while_end)   { str(keys[:while_end]) }

    rule(:comment) { (
      str(keys[:forward])  |
      str(keys[:backward]) |

      str(keys[:increase]) |
      str(keys[:decrease]) |

      str(keys[:output]) |
      str(keys[:input])  |

      str(keys[:while_start]) |
      str(keys[:while_end])
    ).absent? >> any }
  }

  klass
end