Class: Trxl::Environment

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

Instance Method Summary collapse

Constructor Details

#initialize(local_env = {}) ⇒ Environment

called when parsing starts



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# File 'lib/trxl/trxl.rb', line 22

def initialize(local_env = {})
  @stack = [ local_env ]
end

Instance Method Details

#[](variable) ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 52

def [](variable)
  var = variable.to_sym
  @stack.each do |env|
    if env.has_key?(var)
      return env[var]
    end
  end
  nil
end

#[]=(variable, value) ⇒ Object

FIXME find out why map definition doesn’t work



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# File 'lib/trxl/trxl.rb', line 63

def []=(variable, value)
  var = variable.to_sym
  # search all scopes
  @stack.each do |env|
    if env.has_key?(var)
      return env[var] = value
    end
  end
  # not found, assign it in local scope
  local[var] = value
end

#add_library(name) ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 95

def add_library(name)
  (@libraries || []) << name.to_sym
end

#depth ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 39

def depth
  @stack.size
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/trxl/trxl.rb', line 81

def empty?
  @stack.size == 1 ? peek.empty? : @stack.all? { |h| h.empty? }
end

#enter_scope ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 26

def enter_scope
  push #peek.dup
end

#exit_scope ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 30

def exit_scope
  pop
end

#has_key?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/trxl/trxl.rb', line 85

def has_key?(key)
  @stack.any? { |env| env.has_key?(key.to_sym) }
end

#libraries ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 103

def libraries
  @libraries.dup # don't allow modifications outside
end

#library_included?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/trxl/trxl.rb', line 99

def library_included?(name)
  @libraries ? @libraries.include?(name.to_sym) : false
end

#local ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 34

def local
  peek
end

#merge(other_env) ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 43

def merge(other_env)
  self.class.new(local.merge(other_env))
end

#merge!(other_env) ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 47

def merge!(other_env)
  local.merge!(other_env); self
end

#select(&block) ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 89

def select(&block)
  @stack.inject([]) do |memo, env|
    memo << env.select(&block)
  end[0]
end

#to_s ⇒ Object 



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# File 'lib/trxl/trxl.rb', line 75

def to_s
  @stack.inject([]) do |stack, env|
    stack << env.inspect
  end.join(',')
end