Class: Teeth::Scanner

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

Constant Summary collapse

TEMPLATE = 
File.dirname(__FILE__) + "/templates/tokenizer.yy.erb"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, ext_dir = nil) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/teeth/scanner.rb', line 14

def initialize(name, ext_dir=nil)
  @scanner_base_name, @ext_dir = name, ext_dir
  @scanner_defns, @scanner_rules = ScannerDefinitionGroup.new, RuleStatementGroup.new
  ensure_ext_dir_exists if ext_dir
end

Instance Attribute Details

#rdoc ⇒ Object

Returns the value of attribute rdoc.



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# File 'lib/teeth/scanner.rb', line 12

def rdoc
  @rdoc
end

#scanner_defns ⇒ Object (readonly)

Returns the value of attribute scanner_defns.



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# File 'lib/teeth/scanner.rb', line 12

def scanner_defns
  @scanner_defns
end

#scanner_rules ⇒ Object (readonly)

Returns the value of attribute scanner_rules.



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# File 'lib/teeth/scanner.rb', line 12

def scanner_rules
  @scanner_rules
end

Instance Method Details

#define(*args) ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 54

def define(*args)
  @scanner_defns.add(*args)
end

#definitions {|@scanner_defns| ... } ⇒ Object

Yields:



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# File 'lib/teeth/scanner.rb', line 58

def definitions
  yield @scanner_defns
end

#entry_point ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 36

def entry_point
  "scan_" + @scanner_base_name.to_s
end

#extconf ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 40

def extconf
  'require "mkmf"' + "\n" + '$CFLAGS += " -Wall"' + "\n" + 
  'have_library("uuid", "uuid_generate_time")' + "\n" +
  "create_makefile " +
  %Q|"teeth/#{scanner_name}", "./"\n| 
end

#function_prefix ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 32

def function_prefix
  @scanner_base_name.to_s + "_yy"
end

#generate ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 74

def generate
  template = ERB.new(IO.read(TEMPLATE))
  scanner = self
  b = binding
  template.result(b)
end

#init_function_name ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 28

def init_function_name
  "Init_" + scanner_name
end

#load_default_definitions_for(*defn_types) ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 62

def load_default_definitions_for(*defn_types)
  @scanner_defns.defaults_for(*defn_types)
end

#main_function_name ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 24

def main_function_name
  "t_" + scanner_name
end

#rule(*args) ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 66

def rule(*args)
  scanner_rules.add(*args)
end

#rules {|scanner_rules| ... } ⇒ Object

Yields:



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# File 'lib/teeth/scanner.rb', line 70

def rules
  yield scanner_rules
end

#scanner_name ⇒ Object 



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# File 'lib/teeth/scanner.rb', line 20

def scanner_name
  "scan_" + @scanner_base_name.to_s
end

#write! ⇒ Object

Raises:



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# File 'lib/teeth/scanner.rb', line 81

def write!
  raise InvalidExtensionDirectory, "no extension directory specified" unless @ext_dir
  File.open(@ext_dir + "/extconf.rb", "w") do |extconf_rb|
    extconf_rb.write extconf
  end
  File.open(@ext_dir + "/" + scanner_name + ".yy", "w") do |scanner|
    scanner.write generate
  end
end