Module: Panda

Defined in:
lib/panda/build.rb,
lib/panda/expressions.rb,
lib/panda/expressers/inspector.rb,
lib/panda/expressers/tree_expresser.rb,
lib/panda/expressers/examples/sql_expresser.rb

Defined Under Namespace

Modules: Expressers Classes: Boolean, Comparison, Expression, Node, Subject, SubjectGenerator, SyntaxError

Class Method Summary collapse

Class Method Details

.build ⇒ Object

Returns the result of the given block, which is passed a new SubjectGenerator object. If the given block does not return a Panda expression AST then a Panda::SyntaxError exception is raised.

ast = Panda.build { |s| (s.name == 'FooHoney') | (s.booty.like 'whoa!') }
puts ast
puts ast.inspect

produces:

#<Panda::Boolean:0x8255ca8>
(name == "FooHoney" | booty like "whoa!")



44
45
46
47
48
49
 
# File 'lib/panda/build.rb', line 44

def self.build
  unless Panda::Node === ast = yield(SubjectGenerator.new)
    raise SyntaxError, "Invalid PANDA expression: \"#{ast}\". Are you using the != operator, perhaps?"
  end
  return ast
end