class AST

The base class for the 3x “parse tree”, now only used by the top level constructs and the compiler. Handles things like file name, line #, and also does the initialization for all of the parameters of all of the child objects.

Constants

AST: The base class for the 3x “parse tree”, now only used by the top level constructs and the compiler. Handles things like file name, line #, and also does the initialization for all of the parameters of all of the child objects.

Attributes

file[RW]

line[RW]

parent[RW]

pos[RW]

scope[RW]

Private Class Methods

new(file: nil, line: nil, pos: nil) click to toggle source

   # File lib/puppet/parser/ast.rb
47 def initialize(file: nil, line: nil, pos: nil)
48   @file = file
49   @line = line
50   @pos = pos
51 end

Private Instance Methods

evaluate(scope) click to toggle source

Evaluate the current object. Just a stub method, since the subclass should override this method.

   # File lib/puppet/parser/ast.rb
20 def evaluate(scope)
21 end

inspect() click to toggle source

   # File lib/puppet/parser/ast.rb
14 def inspect
15   "( #{self.class} #{self} #{@children.inspect} )"
16 end

safeevaluate(scope) click to toggle source

The version of the evaluate method that should be called, because it correctly handles errors. It is critical to use this method because it can enable you to catch the error where it happens, rather than much higher up the stack.

   # File lib/puppet/parser/ast.rb
27   def safeevaluate(scope)
28     # We duplicate code here, rather than using exceptwrap, because this
29     # is called so many times during parsing.
30     begin
31       return self.evaluate(scope)
32     rescue Puppet::Pops::Evaluator::PuppetStopIteration => detail
33       raise detail
34 #      # Only deals with StopIteration from the break() function as a general
35 #      # StopIteration is a general runtime problem
36 #      raise Puppet::ParseError.new(detail.message, detail.file, detail.line, detail)
37     rescue Puppet::Error => detail
38       raise adderrorcontext(detail)
39     rescue => detail
40       error = Puppet::ParseError.new(detail.to_s, nil, nil, detail)
41       # We can't use self.fail here because it always expects strings,
42       # not exceptions.
43       raise adderrorcontext(error, detail)
44     end
45   end