Class: WAB::Impl::ExprParser

Inherits:
Object
  • Object
show all
Defined in:
lib/wab/impl/expr_parser.rb

Constant Summary collapse

XMAP = 
{
  between: Between,
  eq: Eq,
  gt: Gt,
  gte: Gte,
  in: In,
  has: Has,
  lt: Lt,
  lte: Lte,
  regex: Regex,
  and: And,
  or: Or,
  not: Not,
}.freeze

Class Method Summary collapse

Class Method Details

.parse(native) ⇒ Object

Parses an Array into a set of Expr subsclasses.

native

native Ruby representation of the expression.

Raises:



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# File 'lib/wab/impl/expr_parser.rb', line 24

def parse(native)
  raise WAB::TypeError.new('Invalid expression. Must be an Array.') unless native.is_a?(Array)

  op = native[0]
  op = op.downcase.to_sym unless op.is_a?(Symbol)

  xclass = XMAP[op]
  raise WAB::Error.new("#{op} is not a valid expression function.") if xclass.nil?

  args = []
  native[1..-1].each { |n|
    args << if n.is_a?(Array)
              parse(n)
            elsif n.is_a?(String)
              unless n.empty?
                if "'" == n[0]
                  n[1..-1]
                else
                  WAB::Impl::Data.detect_string(n)
                end
              end
            else
              n
            end
  }
  xclass.new(*args)
end