Class: SexpProcessor::Environment

Inherits:
Object
  • Object
show all
Defined in:
lib/sexp_processor.rb

Overview

I really hate this here, but I hate subdirs in my lib dir more… I guess it is kinda like shaving… I’ll split this out when it itches too much…

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Environment

:nodoc:



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# File 'lib/sexp_processor.rb', line 400

def initialize #:nodoc:
  @env = []
  @env.unshift({})
end

Instance Method Details

#[](name) ⇒ Object

Get name from env at whatever scope it is defined in, or return nil.



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# File 'lib/sexp_processor.rb', line 424

def [] name
  hash = @env.find { |closure| closure.key? name }
  hash[name] if hash
end

#[]=(name, val) ⇒ Object

If name exists in the env, set it to val in whatever scope it is in. If it doesn’t exist, set name to val in the current scope.



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# File 'lib/sexp_processor.rb', line 434

def []= name, val
  hash = @env.find { |closure| closure.key? name } || current
  hash[name] = val
end

#all ⇒ Object

Flatten out all scopes and return all key/value pairs.



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# File 'lib/sexp_processor.rb', line 408

def all
  @env.reverse.inject { |env, scope| env.merge scope }
end

#current ⇒ Object

Get the current/top environment.



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# File 'lib/sexp_processor.rb', line 442

def current
  @env.first
end

#depth ⇒ Object

Return the current number of scopes.



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# File 'lib/sexp_processor.rb', line 415

def depth
  @env.length
end

#scope ⇒ Object

Create a new scope and yield to the block passed.



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# File 'lib/sexp_processor.rb', line 449

def scope
  @env.unshift({})
  begin
    yield
  ensure
    @env.shift
    raise "You went too far unextending env" if @env.empty?
  end
end