note
	description: "Interface for character output streams"
	library: "Gobo Eiffel Kernel Library"
	copyright: "Copyright (c) 2001-2016, Eric Bezault and others"
	license: "MIT License"
	date: "$Date: 2017-04-11 18:34:55 +0000 (Tue, 11 Apr 2017) $"
	revision: "$Revision: 100137 $"

deferred class 
	KI_CHARACTER_OUTPUT_STREAM

inherit
	KI_OUTPUT_STREAM [CHARACTER_8]
		rename
			put as put_character
		redefine
			append
		end

	KL_IMPORTED_STRING_ROUTINES
		export
			{NONE} all
		end

feature -- Output

	put_string (a_string: STRING_8)
			-- Write a_string to output stream.
		require
			is_open_write: is_open_write
			a_string_not_void: a_string /= Void
		deferred
		end

	put_substring (a_string: STRING_8; s, e: INTEGER_32)
			-- Write substring of a_string between indexes
			-- s and e to output stream.
		require
			is_open_write: is_open_write
			a_string_not_void: a_string /= Void
			s_large_enough: s >= 1
			e_small_enough: e <= a_string.count
			valid_interval: s <= e + 1
		do
			if s <= e then
				put_string (a_string.substring (s, e))
			end
		end

	put_integer (i: INTEGER_32)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|(-?[1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_integer_64 (i.to_integer_64)
		end

	put_integer_8 (i: INTEGER_8)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|(-?[1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_integer_64 (i.to_integer_64)
		end

	put_integer_16 (i: INTEGER_16)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|(-?[1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_integer_64 (i.to_integer_64)
		end

	put_integer_32 (i: INTEGER_32)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|(-?[1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_integer_64 (i.to_integer_64)
		end

	put_integer_64 (i: INTEGER_64)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|(-?[1-9][0-9]*)
		require
			is_open_write: is_open_write
		local
			k, j: INTEGER_64
		do
			if i = 0 then
				put_character ('0')
			elseif i < 0 then
				put_character ('-')
				k := - (i + 1)
				j := k // 10
				inspect k \\ 10
				when 0 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('1')
				when 1 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('2')
				when 2 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('3')
				when 3 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('4')
				when 4 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('5')
				when 5 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('6')
				when 6 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('7')
				when 7 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('8')
				when 8 then
					if j /= 0 then
						put_integer_64 (j)
					end
					put_character ('9')
				when 9 then
					put_integer_64 (j + 1)
					put_character ('0')
				end
			else
				k := i
				j := k // 10
				if j /= 0 then
					put_integer_64 (j)
				end
				inspect k \\ 10
				when 0 then
					put_character ('0')
				when 1 then
					put_character ('1')
				when 2 then
					put_character ('2')
				when 3 then
					put_character ('3')
				when 4 then
					put_character ('4')
				when 5 then
					put_character ('5')
				when 6 then
					put_character ('6')
				when 7 then
					put_character ('7')
				when 8 then
					put_character ('8')
				when 9 then
					put_character ('9')
				end
			end
		end

	put_natural_8 (i: NATURAL_8)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|([1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_natural_64 (i.to_natural_64)
		end

	put_natural_16 (i: NATURAL_16)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|([1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_natural_64 (i.to_natural_64)
		end

	put_natural_32 (i: NATURAL_32)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|([1-9][0-9]*)
		require
			is_open_write: is_open_write
		do
			put_natural_64 (i.to_natural_64)
		end

	put_natural_64 (i: NATURAL_64)
			-- Write decimal representation
			-- of i to output stream.
			-- Regexp: 0|([1-9][0-9]*)
		require
			is_open_write: is_open_write
		local
			k, j: NATURAL_64
		do
			if i = 0 then
				put_character ('0')
			else
				k := i
				j := k // 10
				if j /= 0 then
					put_natural_64 (j)
				end
				inspect k \\ 10
				when 0 then
					put_character ('0')
				when 1 then
					put_character ('1')
				when 2 then
					put_character ('2')
				when 3 then
					put_character ('3')
				when 4 then
					put_character ('4')
				when 5 then
					put_character ('5')
				when 6 then
					put_character ('6')
				when 7 then
					put_character ('7')
				when 8 then
					put_character ('8')
				when 9 then
					put_character ('9')
				end
			end
		end

	put_boolean (b: BOOLEAN)
			-- Write "True" to output stream if
			-- b is true, "False" otherwise.
		require
			is_open_write: is_open_write
		do
			if b then
				put_string (True_constant)
			else
				put_string (False_constant)
			end
		end

	append (an_input_stream: KI_INPUT_STREAM [CHARACTER_8])
			-- Read items of an_input_stream until the end
			-- of input is reached, and write these items to
			-- current output stream.
		do
			if attached {KI_CHARACTER_INPUT_STREAM} an_input_stream as a_character_input then
				from
					if not a_character_input.end_of_input then
						a_character_input.read_string (512)
					end
				until
					a_character_input.end_of_input
				loop
					put_string (a_character_input.last_string)
					a_character_input.read_string (512)
				end
			else
				Precursor (an_input_stream)
			end
		end
	
feature -- Basic operations

	flush
			-- Flush buffered data to disk.
		require
			is_open_write: is_open_write
		deferred
		end
	
feature {NONE} -- Implementation

	True_constant: STRING_8 = "True"
			-- String representation of boolean value 'True'

	False_constant: STRING_8 = "False"
			-- String representation of boolean value 'False'
	
end -- class KI_CHARACTER_OUTPUT_STREAM

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