Class: Plasma::Interpreter::Env

Inherits:
Object
  • Object
show all
Defined in:
lib/plasma/interpreter/plasma_grammarnode.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(init = {}, default = nil) ⇒ Env

Returns a new instance of Env.



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 7

def initialize(init={}, default=nil)
  @state = [init]
  @default = default
end

Instance Attribute Details

#default ⇒ Object

Returns the value of attribute default.



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 5

def default
  @default
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 4

def state
  @state
end

Instance Method Details

#bind!(key, value) ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 20

def bind!(key, value)
  @state.last[key] = value
  self
end

#merge!(hash) ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 25

def merge!(hash)
  @state.last.merge!(hash)
  self
end

#release! ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 35

def release!()
  @state.pop
  self
end

#resolve(key) ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 54

def resolve(key)
  @state.reverse_each do |layer|
    return layer[key] if layer.include?(key)
  end

  # nothing to find
  return default
end

#scope(inner = {}) ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 40

def scope(inner={})
  self.scope!(inner)

  begin
    value = yield self
    self.release!

    return value
  rescue => detail
    self.release!
    detail
  end
end

#scope!(inner = {}) ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 30

def scope!(inner={})
  @state.push(inner)
  self
end

#to_plasma ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 16

def to_plasma
  @state.to_plasma
end

#to_s ⇒ Object 



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# File 'lib/plasma/interpreter/plasma_grammarnode.rb', line 12

def to_s
  @state.map {|s| s.inspect}.join("\n")
end