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note
	description: "Abstract convertor for string to number conversion"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2012-05-23 21:13:10 -0700 (Wed, 23 May 2012) $"
	revision: "$Revision: 91981 $"

deferred class 
	STRING_TO_NUMERIC_CONVERTOR

feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end
	
feature -- Access

	generating_type: TYPE [detachable STRING_TO_NUMERIC_CONVERTOR]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are `a' and `b' either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		ensure -- from ANY
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)
		end

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are `a' and `b' either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		ensure -- from ANY
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))
		end

	frozen is_deep_equal (other: attached STRING_TO_NUMERIC_CONVERTOR): BOOLEAN
			-- Are `Current' and `other' attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)
		end

	is_equal (other: attached STRING_TO_NUMERIC_CONVERTOR): BOOLEAN
			-- Is `other' attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		end

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are `a' and `b' either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		ensure -- from ANY
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))
		end

	frozen standard_is_equal (other: attached STRING_TO_NUMERIC_CONVERTOR): BOOLEAN
			-- Is `other' attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end
	
feature -- Status report

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of `other' (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		end

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of `other'?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature -- Status setting

	set_leading_separators (separators: STRING_8)
			-- Set leading_separators with `separators'.
		require
			separators_not_void: separators /= Void
			separators_valid: separators_valid (separators)
		do
			create leading_separators.make_from_string (separators)
		ensure
			leading_separators_set: leading_separators ~ separators
		end

	set_leading_separators_acceptable (b: BOOLEAN)
			-- Set leading_separators_acceptable to `b'.
		do
			leading_separators_acceptable := b
		ensure
			leading_separators_acceptable_set: leading_separators_acceptable = b
		end

	set_trailing_separators (separators: STRING_8)
			-- Set trailing_separators with `separators'.
		require
			separators_not_void: separators /= Void
			separators_valid: separators_valid (separators)
		do
			create trailing_separators.make_from_string (separators)
		ensure
			trailing_separators_set: trailing_separators ~ separators
		end

	set_trailing_separators_acceptable (b: BOOLEAN)
			-- Set trailing_separators_acceptable to `b'.
		do
			trailing_separators_acceptable := b
		ensure
			trailing_separators_acceptable_set: trailing_separators_acceptable = b
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead."
			-- Void if `other' is void; otherwise new object
			-- equal to `other'
			--
			-- For non-void `other', clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			equal: Result ~ other
		end

	copy (other: attached STRING_TO_NUMERIC_CONVERTOR)
			-- Update current object using fields of object attached
			-- to `other', so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead."
			-- Void if `other' is void: otherwise, new object structure
			-- recursively duplicated from the one attached to `other'
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: attached STRING_TO_NUMERIC_CONVERTOR)
			-- Effect equivalent to that of:
			--		copy (`other' . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: attached STRING_TO_NUMERIC_CONVERTOR
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead."
			-- Void if `other' is void; otherwise new object
			-- field-by-field identical to `other'.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: attached STRING_TO_NUMERIC_CONVERTOR)
			-- Copy every field of `other' onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: attached STRING_TO_NUMERIC_CONVERTOR
			-- New object field-by-field identical to `other'.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: attached STRING_TO_NUMERIC_CONVERTOR
			-- New object equal to `Current'
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	frozen as_attached: attached STRING_TO_NUMERIC_CONVERTOR
			-- Attached version of Current
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	frozen default: detachable STRING_TO_NUMERIC_CONVERTOR
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type `POINTER'
			-- (Avoid the need to write `p'.default for
			-- some `p' of type `POINTER'.)
			-- (from ANY)
		do
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		end
	
feature {NONE} -- Implementation

	last_state: INTEGER_32
			-- Last state of this state machine

	sign: INTEGER_32
			-- Sign of this integer, 0: positive; 1: negative.
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result
			Result.set_output_default
		ensure -- from ANY
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		do
			Result := tagged_out
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of `o'
			-- on standard output.
			-- (from ANY)
		do
			if o /= Void then
				Io.put_string (o.out)
			end
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Parse

	parse_character (c: CHARACTER_8)
			-- Parse `c' in current parse session.
			-- Make result available in overflowed, underflowed and parse_successful.			
		deferred
		end

	parse_string_with_type (s: READABLE_STRING_GENERAL; type: INTEGER_32)
			-- reset convertor to start a new parse session and
			-- parse `s' to see if it is a number of `type'.
			-- Make result available in overflowed, underflowed and parse_successful.
			-- See `NUMERIC_INFORMATION' for more information about `type'.
		require
			s_not_void: s /= Void
			type_valid: conversion_type_valid (type)
		deferred
		end
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			operating_environment_not_void: Result /= Void
		end
	
feature -- Reset

	reset (type: INTEGER_32)
			-- Reset this convertor to start a new parse session
			-- and get ready for parsing integer of `type'.
			-- Always call this feature before every new parse session.
			-- See `NUMERIC_INFORMATION' for more information about `type'.			
		require
			type_valid: conversion_type_valid (type)
		deferred
		ensure
			last_state_set: last_state = 0
			sign_set: sign = 0
			conversion_type_set: conversion_type = type
			not_overflowed: not overflowed
			not_underflowed: not underflowed
			parse_successful: parse_successful
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on `correct_mismatch'
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_8
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ")
				create l_exc
				l_msg.append (generating_type.name)
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
feature -- Status reporting

	conversion_type: INTEGER_32
			-- Type to which a string will be converted
			-- See `NUMERIC_INFORMATION' for more information.

	conversion_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' to which string will be converted valid?
			-- See `NUMERIC_INFORMATION' for more information.
		deferred
		end

	leading_separators: STRING_8
			-- Leading separators

	leading_separators_acceptable: BOOLEAN
			-- Are leading separators acceptable?

	overflowed: BOOLEAN
			-- Is number overflowed (too large)?
		deferred
		end

	parse_successful: BOOLEAN
			-- Is parse so far successful?
		deferred
		end

	separators_valid (separators: STRING_8): BOOLEAN
			-- Are `separators' valid?
		require
			separators_not_void: separators /= Void
		deferred
		end

	trailing_separators: STRING_8
			-- Trailing separators

	trailing_separators_acceptable: BOOLEAN
			-- Are trailing separators acceptable?

	underflowed: BOOLEAN
			-- Is number underflowed (too small)?
		deferred
		end
	
feature -- Type checking

	double_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' a valid double type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_double)
		end

	integer_natural_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' a valid integer/natural type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_no_limitation) or (type = Type_integer_8) or (type = Type_integer_16) or (type = Type_integer_32) or (type = Type_integer_64) or (type = Type_natural_8) or (type = Type_natural_16) or (type = Type_natural_32) or (type = Type_natural_64)
		end

	integer_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' a valid integer type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_integer_8) or (type = Type_integer_16) or (type = Type_integer_32) or (type = Type_integer_64)
		end

	natural_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' a valid natural type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_natural_8) or (type = Type_natural_16) or (type = Type_natural_32) or (type = Type_natural_64)
		end

	real_double_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' a valid real/double type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_no_limitation) or (type = Type_real) or (type = Type_double)
		end

	real_type_valid (type: INTEGER_32): BOOLEAN
			-- Is `type' a valid real type?
			-- (from NUMERIC_INFORMATION)
		do
			Result := (type = Type_real)
		end
	
feature -- Types

	max_integer_type: INTEGER_64
			-- INTEGER type of max word length
			-- (from NUMERIC_INFORMATION)

	max_natural_type: NATURAL_64
			-- NATURAL type of max word length
			-- (from NUMERIC_INFORMATION)

	Type_count: INTEGER_32 = 4
			-- Number of types of integer/natural in Eiffel
			-- (from NUMERIC_INFORMATION)

	Type_double: INTEGER_32 = 101
			-- Real/Double type indicators
			-- (from NUMERIC_INFORMATION)

	Type_integer: INTEGER_32 = 3
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_integer_32.
			-- (from NUMERIC_INFORMATION)

	Type_integer_16: INTEGER_32 = 2
			-- (from NUMERIC_INFORMATION)

	Type_integer_32: INTEGER_32 = 3
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_integer.
			-- (from NUMERIC_INFORMATION)

	Type_integer_64: INTEGER_32 = 4
			-- (from NUMERIC_INFORMATION)

	Type_integer_8: INTEGER_32 = 1
			-- (from NUMERIC_INFORMATION)

	Type_integer_natural_separator: INTEGER_32 = 10
			-- (from NUMERIC_INFORMATION)

	Type_natural: INTEGER_32 = 13
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_natural_32.
			-- (from NUMERIC_INFORMATION)

	Type_natural_16: INTEGER_32 = 12
			-- (from NUMERIC_INFORMATION)

	Type_natural_32: INTEGER_32 = 13
			-- Was declared in NUMERIC_INFORMATION as synonym of Type_natural.
			-- (from NUMERIC_INFORMATION)

	Type_natural_64: INTEGER_32 = 14
			-- Integer/natural type indicators
			-- (from NUMERIC_INFORMATION)

	Type_natural_8: INTEGER_32 = 11
			-- (from NUMERIC_INFORMATION)

	Type_no_limitation: INTEGER_32 = 0
			-- Type representing a number sequence (no length limitation)
			-- (from NUMERIC_INFORMATION)

	Type_real: INTEGER_32 = 100
			-- (from NUMERIC_INFORMATION)
	
invariant
	leading_separators_not_void: leading_separators /= Void
	trailing_separators_not_void: trailing_separators /= Void

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

note
	copyright: "Copyright (c) 1984-2012, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class STRING_TO_NUMERIC_CONVERTOR


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