Class: Dentaku::AST::Case
- Inherits:
-
Node
- Object
- Node
- Dentaku::AST::Case
show all
- Defined in:
- lib/dentaku/ast/case.rb
Class Method Summary
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Instance Method Summary
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Methods inherited from Node
arity, peek, precedence, #type
Constructor Details
#initialize(*nodes) ⇒ Case
Returns a new instance of Case.
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# File 'lib/dentaku/ast/case.rb', line 19
def initialize(*nodes)
@switch = nodes.shift
unless @switch.is_a?(AST::CaseSwitchVariable)
raise ParseError.for(:node_invalid), 'Case missing switch variable'
end
@conditions = nodes
@else = nil
@else = @conditions.pop if @conditions.last.is_a?(AST::CaseElse)
@conditions.each do |condition|
unless condition.is_a?(AST::CaseConditional)
raise ParseError.for(:node_invalid), "#{condition} is not a CaseConditional"
end
end
end
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Class Method Details
.max_param_count ⇒ Object
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# File 'lib/dentaku/ast/case.rb', line 15
def self.max_param_count
Float::INFINITY
end
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.min_param_count ⇒ Object
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# File 'lib/dentaku/ast/case.rb', line 11
def self.min_param_count
2
end
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Instance Method Details
#dependencies(context = {}) ⇒ Object
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# File 'lib/dentaku/ast/case.rb', line 53
def dependencies(context = {})
switch_dependencies(context) +
condition_dependencies(context) +
else_dependencies(context)
end
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#value(context = {}) ⇒ Object
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# File 'lib/dentaku/ast/case.rb', line 38
def value(context = {})
switch_value = @switch.value(context)
@conditions.each do |condition|
if condition.when.value(context) == switch_value
return condition.then.value(context)
end
end
if @else
return @else.value(context)
else
raise ArgumentError.for(:invalid_value), "No block matched the switch value '#{switch_value}'"
end
end
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