Class: Proteus::ClassParser

Inherits:
Object
  • Object
show all
Defined in:
lib/ClassParser.rb

Overview

Provides functions for parsing component definitions (for component classes).

Constant Summary collapse

@@CLASS_RE =

The regex for valid class names

/^([A-Z][a-zA-Z_0-9]*)(?:[\s]*<[\s]*([A-Z][a-zA-Z_0-9]*))?$/
@@CHILDREN = 
"children"

Instance Method Summary collapse

Instance Method Details

#parse_yaml(yaml, new_class = nil) ⇒ Object

Parses YAML and returns the resultant component class.

yaml: the YAML to parse new_class: the class instance to parse



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# File 'lib/ClassParser.rb', line 53

def parse_yaml( yaml, new_class = nil )
  result = new_class || ComponentClass.new
  
  # Must be a hash of length one containing a hash
  if not ( yaml.is_a?(Hash) and yaml.length == 1 and
    (yaml.values[0].nil? or yaml.values[0].is_a?(Hash)) ) then
    
    raise Exceptions::DefinitionMalformed, "Class definition malformed"
  end
  
  # Parse the class name
  name = yaml.keys[0]
  match = @@CLASS_RE.match( name )
  
  # If there's no match, the definition is malformed
  if match.nil?
    raise Exceptions::DefinitionMalformed,
      "Class identifier '" + name + "' malformed."
  end
  
  # Set properties of class
  result.name = match[1]
  result.parent = match[2]
  result.properties = yaml.values[0] || {}
  result.children = result.properties.delete(@@CHILDREN) || []
  
  return result
end