blambeau/finitio-rb

require 'finitio/syntax/lexer'

grammar Finitio::Syntax::Literals
  include Finitio::Syntax::Lexer

  rule literal
      seq_literal
    | scalar_literal
  end

  rule seq_literal
    ('{' spacing literal? (comma literal)* spacing '}') {
      captures[:literal].map(&:value)
    }
  end

  rule scalar_literal
      boolean_literal
    | real_literal
    | integer_literal
    | string_literal
  end

  rule boolean_literal
    ("true" | "false")
    <Finitio::Syntax::Literal::Boolean>
  end

  rule integer_literal
    ([0] | [1-9] [0-9]*)
    <Finitio::Syntax::Literal::Integer>
  end

  rule real_literal
    (integer_literal? '.' [0-9]*)
    <Finitio::Syntax::Literal::Real>
  end

  rule string_literal
    (["] str:([\\]["] | !["] .)* ["])
    <Finitio::Syntax::Literal::String>
  end

end