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note description: "[ Objects that are able to iterate over two-way chains, on which they can perform repeated actions and tests according to a number of predefined control structures such as if, until and others. ]" library: "Free implementation of ELKS library" legal: "See notice at end of class." status: "See notice at end of class." names: iterators, iteration, two_way_chain_iterators, two_way_chain_iteration traversal: sequential exploration: forward, backward date: "$Date: 2017-04-09 23:37:21 -0800 (Sun, 09 Apr 2017) $" revision: "$Revision: 100119 $" class interface TWO_WAY_CHAIN_ITERATOR [G] create set (s: like target) -- Make s the new target of iterations. -- (from LINEAR_ITERATOR) require -- from ITERATOR target_exists: s /= Void ensure -- from ITERATOR target = s target /= Void feature -- Initialization set (s: like target) -- Make s the new target of iterations. -- (from LINEAR_ITERATOR) require -- from ITERATOR target_exists: s /= Void ensure -- from ITERATOR target = s target /= Void feature -- Access generating_type: TYPE [detachable TWO_WAY_CHAIN_ITERATOR [G]] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty item: G -- The item at cursor position in target -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR not_off: not target.off item_tuple: TUPLE [G] -- Tuple containing a single element, -- the item at cursor position in target'' -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR not_off: not target.off ensure -- from LINEAR_ITERATOR item_tuple_attached: Result /= Void target: CHAIN [G] -- The structure to which iteration features will apply. 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) ensure -- from ANY instance_free: class 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) 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) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal (other: TWO_WAY_CHAIN_ITERATOR [G]): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void 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) is_equal (other: TWO_WAY_CHAIN_ITERATOR [G]): BOOLEAN -- Is other attached to an object considered -- equal to current object? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result 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) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal (other: TWO_WAY_CHAIN_ITERATOR [G]): 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 ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) 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 invariant_value: BOOLEAN -- Is the invariant satisfied? -- (Redefinitions of this feature will usually involve -- target; if so, make sure that the result is defined -- when target = Void.) -- (from ITERATOR) 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 ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) feature -- Cursor movement back -- Move cursor of target backward one position. exhausted: BOOLEAN -- Is target exhausted? -- (from LINEAR_ITERATOR) finish -- Move cursor of target to last position. forth -- Move to next position of target. -- (from LINEAR_ITERATOR) off: BOOLEAN -- Is position of target off? -- (from LINEAR_ITERATOR) start -- Move to first position of target. -- (from LINEAR_ITERATOR) feature -- Duplication copy (other: TWO_WAY_CHAIN_ITERATOR [G]) -- 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) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: TWO_WAY_CHAIN_ITERATOR [G]) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: TWO_WAY_CHAIN_ITERATOR [G] -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: TWO_WAY_CHAIN_ITERATOR [G]) -- 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) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: TWO_WAY_CHAIN_ITERATOR [G] -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: TWO_WAY_CHAIN_ITERATOR [G] -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable TWO_WAY_CHAIN_ITERATOR [G] -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class feature -- Iteration continue_for_back (action: PROCEDURE [G]; n, k: INTEGER_32) -- Apply action to every k-th item, -- n times if possible. -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR valid_repetition: n >= 0 valid_skip: k >= 1 continue_for (action: PROCEDURE [G]; n, k: INTEGER_32) -- Apply action to every k-th item, -- n times if possible. -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR valid_repetition: n >= 0 valid_skip: k >= 1 continue_search (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN) -- Search the first item of target -- satisfying: test equals to b -- (from the current position of target). -- (from LINEAR_ITERATOR) ensure then -- from LINEAR_ITERATOR found: not exhausted = (b = test.item ([target.item])) continue_search_back (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN) -- Search the first item of target -- satisfying: test equals to b -- (from the current position of target). -- (from LINEAR_ITERATOR) ensure then -- from LINEAR_ITERATOR found: not exhausted = (b = test.item ([target.item])) continue_until_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one satisfying test. -- (from the current position of target). -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR invariant_satisfied: invariant_value ensure then -- from LINEAR_ITERATOR achieved: not exhausted implies test.item ([target.item]) continue_until (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one satisfying test. -- (from the current position of target). -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR invariant_satisfied: invariant_value ensure then -- from LINEAR_ITERATOR achieved: not exhausted implies test.item ([target.item]) continue_while (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one not satisfying test -- (from the current position of target). -- (from LINEAR_ITERATOR) require else -- from LINEAR_ITERATOR invariant_satisfied: invariant_value ensure then -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) continue_while_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one not satisfying test -- (from the current position of target). -- (from LINEAR_ITERATOR) require else -- from LINEAR_ITERATOR invariant_satisfied: invariant_value ensure then -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) do_all (action: PROCEDURE [G]) -- Apply action to every item of target. -- (from ITERATOR) require -- from ITERATOR action_exists: action /= Void do_all_back (action: PROCEDURE [G]) -- Apply action to every item of target. -- (from ITERATOR) require -- from ITERATOR action_exists: action /= Void do_for_back (action: PROCEDURE [G]; i, n, k: INTEGER_32) -- Apply action to every k-th item, -- n times if possible, starting from i-th. -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR valid_start: i >= 1 valid_repetition: n >= 0 valid_skip: k >= 1 do_for (action: PROCEDURE [G]; i, n, k: INTEGER_32) -- Apply action to every k-th item, -- n times if possible, starting from i-th. -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR valid_start: i >= 1 valid_repetition: n >= 0 valid_skip: k >= 1 do_if (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target satisfying test. -- (from ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void do_if_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target satisfying test. -- (from ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void do_until_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one satisfying test. -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR achieved: not exhausted implies test.item ([target.item]) do_until (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one satisfying test. -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR achieved: not exhausted implies test.item ([target.item]) do_while (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one not satisfying test. -- (from the start of target) -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) do_while_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- and including first one not satisfying test. -- (from the start of target) -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) for_all (test: FUNCTION [G, BOOLEAN]): BOOLEAN -- Does test return true for -- all items of target? -- (from LINEAR_ITERATOR) require -- from ITERATOR test_exists: test /= Void for_all_back (test: FUNCTION [G, BOOLEAN]): BOOLEAN -- Does test return true for -- all items of target? -- (from LINEAR_ITERATOR) require -- from ITERATOR test_exists: test /= Void search (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN) -- Search the first item of target for which test -- has the same value as b (both true or both false). -- (from LINEAR_ITERATOR) search_back (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN) -- Search the first item of target for which test -- has the same value as b (both true or both false). -- (from LINEAR_ITERATOR) there_exists (test: FUNCTION [G, BOOLEAN]): BOOLEAN -- Does test return true for -- at least one item of target? -- (from LINEAR_ITERATOR) require -- from ITERATOR test_exists: test /= Void there_exists_back (test: FUNCTION [G, BOOLEAN]): BOOLEAN -- Does test return true for -- at least one item of target? -- (from LINEAR_ITERATOR) require -- from ITERATOR test_exists: test /= Void until_continue (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target from current -- position, up to but excluding first one satisfying test. -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR invariant_satisfied: invariant_value ensure -- from LINEAR_ITERATOR achieved: exhausted or else test.item ([target.item]) invariant_satisfied: invariant_value until_continue_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target from current -- position, up to but excluding first one satisfying test. -- (from LINEAR_ITERATOR) require -- from LINEAR_ITERATOR invariant_satisfied: invariant_value ensure -- from LINEAR_ITERATOR achieved: exhausted or else test.item ([target.item]) invariant_satisfied: invariant_value until_do_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- but excluding first one satisfying test. -- (Apply to full list if no item satisfies test.) -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR achieved: not exhausted implies test.item ([target.item]) until_do (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- but excluding first one satisfying test. -- (Apply to full list if no item satisfies test.) -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR achieved: not exhausted implies test.item ([target.item]) while_continue (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- but excluding first one not satisfying test. -- (from LINEAR_ITERATOR) ensure -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) while_continue_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- but excluding first one not satisfying test. -- (from LINEAR_ITERATOR) ensure -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) while_do_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- but excluding first one not satisfying test. -- (Apply to full list if all items satisfy test.) -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) while_do (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN]) -- Apply action to every item of target up to -- but excluding first one not satisfying test. -- (Apply to full list if all items satisfy test.) -- (from LINEAR_ITERATOR) require -- from ITERATOR action_exists: action /= Void test_exists: test /= Void ensure then -- from LINEAR_ITERATOR finished: not exhausted implies not test.item ([target.item]) feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void invariant -- from LINEAR_ITERATOR target_exists: target /= Void -- from ITERATOR traversable_exists: target /= 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 TWO_WAY_CHAIN_ITERATOR
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