Class: Rattler::BackEnd::ParserGenerator::OptionalGenerator

Inherits:
ExprGenerator
  • Object
show all
Includes:
NestedSubGenerating
Defined in:
lib/rattler/back_end/parser_generator/optional_generator.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Parsers

define

Methods inherited from ExprGenerator

#gen_intermediate, #gen_intermediate_assert, #gen_intermediate_disallow, #gen_intermediate_skip, #initialize

Constructor Details

This class inherits a constructor from Rattler::BackEnd::ParserGenerator::ExprGenerator

Class Method Details

.nested(*args) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 68

def OptionalGenerator.nested(*args)
  NestedOptionalGenerator.new(*args)
end

.top_level(*args) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 77

def OptionalGenerator.top_level(*args)
  TopLevelOptionalGenerator.new(*args)
end

Instance Method Details

#gen_assert(optional, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 22

def gen_assert(optional, scope={})
  @g << 'true'
end

#gen_basic(optional, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 9

def gen_basic(optional, scope={})
  if optional.capturing?
    expr do
      @g.surround("(#{result_name} = ", ')') do
        generate optional.child, :basic, scope
      end
      @g << " ? [#{result_name}] : []"
    end
  else
    gen_skip optional, scope
  end
end

#gen_direct_action(optional, code, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 38

def gen_direct_action(optional, code, scope={})
  expr :block do
    @g << "#{result_name} = "
    generate optional.child, :basic, scope
    @g.newline <<
      '(' << code.bind(scope, ["(#{result_name} ? [#{result_name}] : [])"]) << ')'
  end
end

#gen_disallow(optional, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 26

def gen_disallow(optional, scope={})
  @g << 'false'
end

#gen_dispatch_action(optional, code, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 30

def gen_dispatch_action(optional, code, scope={})
  expr :block do
    @g << "#{result_name} = "
    generate optional.child, :basic, scope
    @g.newline << code.bind(scope, "#{result_name} ? [#{result_name}] : []")
  end
end

#gen_skip(optional, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 54

def gen_skip(optional, scope={})
  expr :block do
    generate optional.child, :intermediate_skip, scope
    @g.newline << 'true'
  end
end

#gen_token(optional, scope = {}) ⇒ Object 



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# File 'lib/rattler/back_end/parser_generator/optional_generator.rb', line 47

def gen_token(optional, scope={})
  expr :block do
    generate optional.child, :token, scope
    @g << " || ''"
  end
end