Class: Lisp::EnvironmentFrame
- Defined in:
- lib/rubylisp/environment_frame.rb
Instance Attribute Summary collapse
-
#current_code ⇒ Object
Returns the value of attribute current_code.
-
#frame ⇒ Object
Returns the value of attribute frame.
-
#name ⇒ Object
Returns the value of attribute name.
-
#parent ⇒ Object
readonly
Returns the value of attribute parent.
-
#previous ⇒ Object
Returns the value of attribute previous.
-
#project_environment ⇒ Object
readonly
Returns the value of attribute project_environment.
Class Method Summary collapse
Instance Method Summary collapse
- #bind(symbol, value) ⇒ Object
- #bind_locally(symbol, value) ⇒ Object
- #binding_for(symbol) ⇒ Object
-
#bound_names ⇒ Object
Bindings following parent env frame pointer.
- #bound_values ⇒ Object
- #clear ⇒ Object
- #depth ⇒ Object
- #dump(frame_number = 0) ⇒ Object
- #dump_bindings ⇒ Object
- #dump_headers ⇒ Object
- #dump_single_frame(frame_number) ⇒ Object
- #has_frame? ⇒ Boolean
-
#initialize(parent, name, f = nil) ⇒ EnvironmentFrame
constructor
A new instance of EnvironmentFrame.
- #internal_dump_headers(frame_number) ⇒ Object
- #is_name_bound?(str) ⇒ Boolean
-
#local_binding_for(symbol) ⇒ Object
Bindings local to this env frame only.
- #name_bound_locally?(str) ⇒ Boolean
- #quick_value_of(symbol_name) ⇒ Object
- #set(symbol, value) ⇒ Object
-
#value_of(symbol) ⇒ Object
Look up a symbol.
Constructor Details
#initialize(parent, name, f = nil) ⇒ EnvironmentFrame
Returns a new instance of EnvironmentFrame.
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# File 'lib/rubylisp/environment_frame.rb', line 20 def initialize(parent, name, f=nil) @bindings = [] @parent = parent @name = name @frame = f @current_code = [] end |
Instance Attribute Details
#current_code ⇒ Object
Returns the value of attribute current_code.
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# File 'lib/rubylisp/environment_frame.rb', line 5 def current_code @current_code end |
#frame ⇒ Object
Returns the value of attribute frame.
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# File 'lib/rubylisp/environment_frame.rb', line 5 def frame @frame end |
#name ⇒ Object
Returns the value of attribute name.
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# File 'lib/rubylisp/environment_frame.rb', line 5 def name @name end |
#parent ⇒ Object (readonly)
Returns the value of attribute parent.
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# File 'lib/rubylisp/environment_frame.rb', line 6 def parent @parent end |
#previous ⇒ Object
Returns the value of attribute previous.
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# File 'lib/rubylisp/environment_frame.rb', line 5 def previous @previous end |
#project_environment ⇒ Object (readonly)
Returns the value of attribute project_environment.
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# File 'lib/rubylisp/environment_frame.rb', line 6 def project_environment @project_environment end |
Class Method Details
.extending(parent, name, f = nil) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 13 def self.extending(parent, name, f=nil) f ||= parent.frame if parent && parent.has_frame? e = self.new(parent, name, f) TopLevelEnvironments[name] = e if parent.nil? || parent == self.global e end |
.global ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 8 def self.global @@global_frame ||= EnvironmentFrame.new(nil, "GLOBAL") @@global_frame end |
Instance Method Details
#bind(symbol, value) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 72 def bind(symbol, value) b = self.binding_for(symbol) if b.nil? @bindings << Lisp::Binding.new(symbol, value) else b.value = value end end |
#bind_locally(symbol, value) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 101 def bind_locally(symbol, value) b = self.local_binding_for(symbol) if b.nil? @bindings << Lisp::Binding.new(symbol, value) else b.value = value end end |
#binding_for(symbol) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 65 def binding_for(symbol) binding = @bindings.detect {|b| b.symbol.name == symbol.name} return binding unless binding.nil? return @parent.binding_for(symbol) unless @parent.nil? nil end |
#bound_names ⇒ Object
Bindings following parent env frame pointer
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# File 'lib/rubylisp/environment_frame.rb', line 41 def bound_names @bindings.map {|b| b.symbol} end |
#bound_values ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 45 def bound_values @bindings.map {|b| b.value} end |
#clear ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 29 def clear TopLevelEnvironments[@name] = nil if TopLevelEnvironments.has_key?(@name) @bindings.each {|b| b.value = nil} end |
#depth ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 172 def depth if @previous.nil? 1 else 1 + @previous.depth end end |
#dump(frame_number = 0) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 141 def dump(frame_number=0) puts "Frame #{frame_number}: #{@current_code[0]}" dump_bindings @previous.dump(frame_number + 1) unless @previous.nil? end |
#dump_bindings ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 133 def dump_bindings @bindings.each do |b| puts b.to_s if b.value.nil? || !b.value.primitive? end puts end |
#dump_headers ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 166 def dump_headers puts internal_dump_headers(0) end |
#dump_single_frame(frame_number) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 148 def dump_single_frame(frame_number) if frame_number == 0 puts "Evaling: #{@current_code[0]}" dump_bindings elsif !@previous.nil? @previous.dump_single_frame(frame_number - 1) else puts "Invalid frame selected." end end |
#has_frame? ⇒ Boolean
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# File 'lib/rubylisp/environment_frame.rb', line 35 def has_frame? !@frame.nil? end |
#internal_dump_headers(frame_number) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 159 def internal_dump_headers(frame_number) puts "Frame #{frame_number}: #{@current_code[0]}" @previous.internal_dump_headers(frame_number + 1) unless @previous.nil? end |
#is_name_bound?(str) ⇒ Boolean
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# File 'lib/rubylisp/environment_frame.rb', line 49 def is_name_bound?(str) if !@frame && @frame.has_slot?(Lisp:Symbol.named("#{str}:", true)) return true end binding = @bindings.detect {|b| b.symbol.name == str} return true unless binding.nil? return false if @parent.nil? return @parent.is_name_bound?(str) end |
#local_binding_for(symbol) ⇒ Object
Bindings local to this env frame only
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# File 'lib/rubylisp/environment_frame.rb', line 97 def local_binding_for(symbol) @bindings.detect {|b| b.symbol.name == symbol.name} end |
#name_bound_locally?(str) ⇒ Boolean
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# File 'lib/rubylisp/environment_frame.rb', line 60 def name_bound_locally?(str) binding = @bindings.detect {|b| b.symbol.name == str} !binding.nil? end |
#quick_value_of(symbol_name) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 127 def quick_value_of(symbol_name) b = binding_for(Symbol.new(symbol_name)) b.nil? ? nil : b.value end |
#set(symbol, value) ⇒ Object
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# File 'lib/rubylisp/environment_frame.rb', line 81 def set(symbol, value) naked_symbol = symbol.to_naked if @frame && @frame.has_slot?(naked_symbol) return @frame.at_put(naked_symbol, value) end b = self.binding_for(symbol) if b.nil? raise "#{symbol} is undefined." else b.value = value end end |
#value_of(symbol) ⇒ Object
Look up a symbol
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# File 'lib/rubylisp/environment_frame.rb', line 112 def value_of(symbol) b = local_binding_for(symbol) return b.value unless b.nil? naked_symbol = symbol.to_naked if @frame && @frame.has_slot?(naked_symbol) return @frame.get(naked_symbol) end b = binding_for(symbol) return b.value unless b.nil? nil end |