Class: Ldpath::Program

Inherits:
Object
  • Object
show all
Includes:
Functions
Defined in:
lib/ldpath/program.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Functions

#concat, #contains, #earliest, #endsWith, #eq, #equals, #equalsIgnoreCase, #first, #flatten, #ge, #get, #gt, #isEmpty, #last, #latest, #le, #lt, #max, #min, #ne, #replace, #round, #startsWith, #strJoin, #strLeft, #strRight, #strlen, #subList, #substr, #sum, #wc

Constructor Details

#initialize(mappings) ⇒ Program

Returns a new instance of Program.



25
26
27
28
 
# File 'lib/ldpath/program.rb', line 25

def initialize mappings
  @mappings ||= mappings
  @cache = {}
end

Instance Attribute Details

#mappings ⇒ Object (readonly)

Returns the value of attribute mappings.



24
25
26
 
# File 'lib/ldpath/program.rb', line 24

def mappings
  @mappings
end

Class Method Details

.parse(program, transform_context = {}) ⇒ Object 



7
8
9
10
11
12
 
# File 'lib/ldpath/program.rb', line 7

def parse program, transform_context = {}
  parsed = parser.parse(program)
  ast = transform.apply parsed, transform_context

  Ldpath::Program.new ast.compact
end

Instance Method Details

#evaluate(uri, context = nil) ⇒ Object 



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
 
# File 'lib/ldpath/program.rb', line 37

def evaluate uri, context = nil
  h = {}
  context ||= RDF::Graph.load uri.to_s

  mappings.each do |m|
    h[m.name] = case m.selector
    when Selector
      m.selector.evaluate(self, uri, context).map do |x| 
        next x unless m.field_type
        RDF::Literal.new(x.to_s, datatype: m.field_type).canonicalize.object
      end
    else
      Array(m.selector)
    end
  end

  h
end

#func_call(fname, uri, context, *arguments) ⇒ Object 



56
57
58
59
60
61
62
 
# File 'lib/ldpath/program.rb', line 56

def func_call fname, uri, context, *arguments
  if function_method? fname
    public_send(fname, uri, context, *arguments)
  else
    raise "No such function: #{fname}"
  end
end

#loading(uri, context) ⇒ Object 



30
31
32
33
34
35
 
# File 'lib/ldpath/program.rb', line 30

def loading uri, context
  if uri.to_s =~ /^http/ and !context.has_subject?(uri)
    @cache[uri] ||= RDF::Graph.load(uri)
    context << @cache[uri]
  end
end