Class: Treetop::Compiler::ParsingExpression

Inherits:
Runtime::SyntaxNode show all
Defined in:
lib/treetop/compiler/node_classes/parsing_expression.rb

Instance Attribute Summary collapse

Attributes inherited from Runtime::SyntaxNode

#input, #interval, #parent

Instance Method Summary collapse

Methods inherited from Runtime::SyntaxNode

#<=>, #dot_id, #elements, #empty?, #extension_modules, #initialize, #inspect, #inspect_children, #inspect_self, #nonterminal?, #terminal?, #text_value, #write_dot, #write_dot_file

Constructor Details

This class inherits a constructor from Treetop::Runtime::SyntaxNode

Instance Attribute Details

#address ⇒ Object (readonly)

Returns the value of attribute address.



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 4

def address
  @address
end

#builder ⇒ Object (readonly)

Returns the value of attribute builder.



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 4

def builder
  @builder
end

#parent_expression ⇒ Object (readonly)

Returns the value of attribute parent_expression.



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 4

def parent_expression
  @parent_expression
end

#subexpression_address ⇒ Object (readonly)

Returns the value of attribute subexpression_address.



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 4

def subexpression_address
  @subexpression_address
end

#var_symbols ⇒ Object (readonly)

Returns the value of attribute var_symbols.



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 4

def var_symbols
  @var_symbols
end

Instance Method Details

#accumulate_subexpression_result ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 65

def accumulate_subexpression_result
  builder.accumulate accumulator_var, subexpression_result_var
end

#accumulator_var ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 45

def accumulator_var
  var(:accumulator)
end

#assign_failure(start_index_var) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 98

def assign_failure(start_index_var)
  assign_result("nil")
end

#assign_lazily_instantiated_node ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 102

def assign_lazily_instantiated_node
  assign_result("true")
end

#assign_result(value_ruby) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 69

def assign_result(value_ruby)
  builder.assign result_var, value_ruby
end

#begin_comment(expression) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 138

def begin_comment(expression)
  #builder << "# begin #{on_one_line(expression)}"
end

#compile(address, builder, parent_expression) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 6

def compile(address, builder, parent_expression)
  @address = address
  @builder = builder
  @parent_expression = parent_expression
end

#declared_module_name ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 16

def declared_module_name
  parent_expression && parent_expression.node_class_name
end

#decorated? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 24

def decorated?
  parent_expression && (parent_expression.node_class_name || parent_expression.node_class_name || parent_expression.inline_module_name)
end

#end_comment(expression) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 142

def end_comment(expression)
  #builder << "# end #{on_one_line(expression)}"
end

#epsilon_node ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 94

def epsilon_node
  "instantiate_node(SyntaxNode,input, index...index)"
end

#expected ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 150

def expected
  nil # Overridden for terminal parse failures
end

#extend_result(module_name) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 73

def extend_result(module_name)
  builder.extend result_var, module_name
end

#extend_result_with_declared_module ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 77

def extend_result_with_declared_module
  extend_result declared_module_name if declared_module_name
end

#extend_result_with_inline_module(parent_expression = nil) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 81

def extend_result_with_inline_module parent_expression = nil
  if parent_expression && parent_expression.parent_modules.size > 0
    parent_expression.parent_modules.each do |inline|
      extend_result inline.module_name
    end
  end
  extend_result inline_module_name if inline_module_name
end

#init_value(var_symbol) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 130

def init_value(var_symbol)
  case var_symbol
  when :accumulator then '[]'
  when :start_index then 'index'
  else nil
  end
end

#inline_module_name ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 20

def inline_module_name
  parent_expression && parent_expression.inline_module_name
end

#node_class_name ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 12

def node_class_name
  parent_expression && parent_expression.node_class_name || 'SyntaxNode'
end

#obtain_new_subexpression_address ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 61

def obtain_new_subexpression_address
  @subexpression_address = builder.next_address
end

#on_one_line(expression) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 146

def on_one_line(expression)
  expression.text_value.tr("\n", ' ')
end

#optional_arg(arg) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 28

def optional_arg(arg)
  if arg
    ", #{arg}"
  else
    ''
  end
end

#reset_index ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 90

def reset_index
  builder.assign '@index', start_index_var
end

#result_var ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 41

def result_var
  var(:result)
end

#start_index_var ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 49

def start_index_var
  var(:start_index)
end

#subexpression_result_var ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 53

def subexpression_result_var
  "r#{subexpression_address}"
end

#subexpression_success? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 57

def subexpression_success?
  subexpression_result_var
end

#use_vars(*var_symbols) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 36

def use_vars(*var_symbols)
  @var_symbols = var_symbols
  builder << var_initialization
end

#var(var_symbol) ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 121

def var(var_symbol)
  case var_symbol
  when :result then "r#{address}"
  when :accumulator then "s#{address}"
  when :start_index then "i#{address}"
  else raise "Unknown var symbol #{var_symbol}."
  end
end

#var_initialization ⇒ Object 



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# File 'lib/treetop/compiler/node_classes/parsing_expression.rb', line 106

def var_initialization
  left, right = [], []
  var_symbols.each do |symbol|
    if init_value(symbol)
      left << var(symbol)
      right << init_value(symbol)
    end
  end
  if left.empty?
    ""
  else
    left.join(', ') + ' = ' + right.join(', ')
  end
end