Class: String

Inherits:
Object show all
Defined in:
lib/javaclass/string_ux.rb,
lib/javaclass/java_name.rb

Overview

Add some unpack helper methods for HI-LO byte order (network byte order) contained in this String.

Author

Peter Kofler

Constant Summary collapse

TYPES = 
[JavaClass::JavaClassFileName, JavaClass::JavaVMName, JavaClass::JavaPackageName, JavaClass::JavaQualifiedName]
RUBY19 = 
''.respond_to? :codepoints

Instance Method Summary collapse

Instance Method Details

#double(index = 0) ⇒ Object

Return the index’th and the next 7 elements as double precision float.



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# File 'lib/javaclass/string_ux.rb', line 46

def double(index=0)
  self[index..index+7].unpack('G')[0]
end

#single(index = 0) ⇒ Object

Return the index’th and the next 3 elements as single precision float.

See

steve.hollasch.net/cgindex/coding/ieeefloat.html

See

blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/196633



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# File 'lib/javaclass/string_ux.rb', line 41

def single(index=0)
  self[index..index+3].unpack('g')[0]
end

#to_javaname ⇒ Object

Convert a Java classname or Java class filename to special String with methods to work with Java class or package names. If it’s a pathname then it must be relative to the classpath. Source extension and additional JVM method declarations are dropped.



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# File 'lib/javaclass/java_name.rb', line 348

def to_javaname

  match = TYPES.find { |type| type.valid?(self) }
  if match
    return match.new(self)
  end

  plain_name = self.sub(/#{JavaClass::JavaLanguage::SOURCE_REGEX}|".*$|\.<.*$/, '').gsub(/\\/, '/')
  match = TYPES.find { |type| type.valid?(plain_name) }
  if match
    match.new(plain_name)
  else
    raise ArgumentError, "unknown Java name #{self}"
  end
end

#u1(index = 0) ⇒ Object

Return the index’th element as byte.



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# File 'lib/javaclass/string_ux.rb', line 8

def u1(index=0)
  if RUBY19
    self[index..index].unpack('C')[0]
  else
    self[index]
  end
end

#u2(index = 0) ⇒ Object

Return the index’th and the next element as unsigned word.



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# File 'lib/javaclass/string_ux.rb', line 17

def u2(index=0)
  self[index..index+1].unpack('n')[0]
  # self[index]*256 + self[index+1]
end

#u2rep(count = 1, index = 0) ⇒ Object

Return the index’th and the next element as unsigned word, repeat it for count words in total and return an array of these words.



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# File 'lib/javaclass/string_ux.rb', line 24

def u2rep(count=1, index=0)
  self[index...index+count*2].unpack('n'*count)
end

#u4(index = 0) ⇒ Object

Return the index’th and the next 3 elements as unsigned dword.



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# File 'lib/javaclass/string_ux.rb', line 29

def u4(index=0)
  self[index..index+3].unpack('N')[0]
end

#u8(index = 0) ⇒ Object

Return the index’th and the next 7 elements as unsigned qword.



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# File 'lib/javaclass/string_ux.rb', line 34

def u8(index=0)
  u4(index) * 256**4 + u4(index+4)
end