Class: Pione::Lang::CaseBranch

Inherits:
ConditionalBranch show all
Defined in:
lib/pione/lang/conditional-branch.rb

Overview

CaseBranch is a class for +case+ branches.

Instance Method Summary collapse

Methods included from Util::Positionable

#line_and_column, #pos, #set_source_position

Instance Method Details

#eval(env) ⇒ Object

Return suitable context in the environment.



59
60
61
62
63
64
65
66
67
68
69
70
 
# File 'lib/pione/lang/conditional-branch.rb', line 59

def eval(env)
  # evaluate the condition
  val = expr.eval!(env)

  # return matched branch's context
  _, matched = when_contexts.find do |_expr, _context|
    val.call_pione_method(env, "==*", [_expr]).value
  end

  # return matched context, else-context, or empty context
  return matched || else_context || ConditionalBranchContext.new
end

#validate(acceptances) ⇒ Object

Validate inner contexts based on the list of acceptances.



53
54
55
56
 
# File 'lib/pione/lang/conditional-branch.rb', line 53

def validate(acceptances)
  when_contexts.each {|_expr, _context| _context.validate(acceptances)}
  else_context.validate(acceptances)
end