Class: Rust::Types::String

Inherits:
Type
  • Object
show all
Defined in:
lib/rust_require/types/string.rb

Instance Attribute Summary

Attributes inherited from Type

#rust_type

Instance Method Summary collapse

Methods inherited from Type

#c_type, #ffi_input_type, #ffi_output_type, #initialize, rust_type, #rust_type_regex

Constructor Details

This class inherits a constructor from Rust::Types::Type

Instance Method Details

#c_input_conversion(slice) ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 42

def c_input_conversion(slice)
  not_implemented
end

#c_input_type ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 12

def c_input_type
  not_implemented
end

#c_output_conversion(name) ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 18

def c_output_conversion(name)
  <<-CODE
  {
      let mut #{name} = #{name};

      // deallocate unused capacity if any
      if #{name}.len() != #{name}.capacity() {
          unsafe {
              let ptr = #{name}.as_mut_vec().as_mut_ptr();
              std::rt::heap::deallocate(
                  ptr.offset(#{name}.len() as isize),
                  #{name}.capacity() - #{name}.len(),
                  std::mem::min_align_of::<u8>()
              );
          }
      }

      let tuple = (#{name}.as_ptr(), #{name}.len());
      std::mem::forget(#{name});
      tuple
  }
  CODE
end

#c_output_type ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 16

def c_output_type; '(*const u8,usize)'; end

#ffi_type ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 46

def ffi_type; Rust::Slice.by_value; end

#not_implemented ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/rust_require/types/string.rb', line 8

def not_implemented
  raise NotImplementedError, 'String as rust input type is not supported, use &str instead!'
end

#ruby_input_conversion(str) ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 53

def ruby_input_conversion(str)
  not_implemented
end

#ruby_output_conversion(slice) ⇒ Object 



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# File 'lib/rust_require/types/string.rb', line 48

def ruby_output_conversion(slice)
  (start,len) = slice.unpack
  start.read_string(len.to_i).force_encoding("UTF-8")
end