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note description: "[ Platform specific encoding of Unicode strings. By default, UTF-8 on unix or UTF-16 on Windows. Mixed-encoding consideration ============================ Most operating systems have conventions for strings that are incompatible with Unicode. On UNIX, a string is just a null-terminated byte sequence, it does not follow any specific encoding. Usually the locale setting enables you to see the string the way you expect. On Windows, the sequence of names is made of null-terminated UTF-16 code unit sequence. Windows does not guarantee that the sequence is actually a valid UTF-16 sequence. In other words, when there is an invalid UTF-8 encoding on UNIX, or an invalid UTF-16 encoding on Windows, the string is not directly representable as a Unicode string. To make it possible to create and store strings in a textually representable form, the query string will create an encoded representation that can be then later used in make to create a NATIVE_STRING equivalent to the original string. The encoding is described in UTF_CONVERTER's note clause and is a fourth variant of the recommended practice for replacement characters in Unicode (see http://www.unicode.org/review/pr-121.html). ]" date: "$Date: 2021-06-18 09:01:52 -0800 (Fri, 18 Jun 2021) $" revision: "$Revision: 105548 $" class interface NATIVE_STRING create make (a_string: READABLE_STRING_GENERAL) -- Initialize an instance of Current using a_string treated as a sequence -- of Unicode characters. require a_string_not_void: a_string /= Void make_empty (a_length: INTEGER_32) -- Initialize an empty instance of Current that will accommodate a_length code units. -- The memory area is not initialized. require a_length_positive: a_length >= 0 make_from_pointer (a_pointer: POINTER) -- Initialize current from a_pointer, a platform system specific null-terminated string. require a_path_pointer_not_null: a_pointer /= default_pointer make_from_raw_string (a_raw_string: like raw_string) -- Initialize current from a_raw_string. require a_raw_string_not_void: a_raw_string /= Void ensure set: raw_string.same_string (a_raw_string) feature -- Access generating_type: TYPE [detachable NATIVE_STRING] -- 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: POINTER -- Get pointer to allocated area. ensure item_not_null: Result /= default_pointer managed_data: MANAGED_POINTER -- Hold data of Current. raw_string: STRING_8 -- Sequence of bytes representing Current. string: STRING_32 -- Representation of Current up to the first null character. substring (start_pos, end_pos: INTEGER_32): STRING_32 -- Copy of substring containing all code units at indices -- between start_pos and end_pos. require start_position_big_enough: start_pos >= 1 end_position_big_enough: start_pos <= end_pos + 1 end_position_not_too_big: end_pos <= (capacity // unit_size) ensure susbstring_not_void: Result /= Void feature -- Measurement bytes_count: INTEGER_32 -- Number of bytes used by Current not including the null terminating character. ensure bytes_count_non_negative: Result >= 0 capacity: INTEGER_32 -- Number of bytes in Current. unit_count: INTEGER_32 -- Number of units used by Current not including the null terminating unit. unit_size: INTEGER_32 -- Size in bytes of a unit for storage. 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 alias "≡≡≡" (other: NATIVE_STRING): 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: like Current): BOOLEAN -- Is content of string identical to content of string other? 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 alias "" (other: NATIVE_STRING): 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 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 -- Element change set_shared_from_pointer (a_ptr: POINTER) -- New instance sharing a_ptr. require a_ptr_not_null: a_ptr /= default_pointer set_shared_from_pointer_and_count (a_ptr: POINTER; a_length: INTEGER_32) -- New instance sharing a_ptr of a_length byte. Space for an additional -- null terminating code unit is added to managed_data. require a_ptr_not_null: a_ptr /= default_pointer a_length_non_negative: a_length >= 0 a_length_valid: (a_length \\ unit_size) = 0 set_string (a_string: READABLE_STRING_GENERAL) -- Set string with a_string treated as a sequence of Unicode characters. require a_string_not_void: a_string /= Void set_substring (a_string: READABLE_STRING_GENERAL; start_pos, end_pos: INTEGER_32) -- Set string with a subset of a_string from a_start_pos index to end_pos index. require a_string_not_void: a_string /= Void start_position_big_enough: start_pos >= 1 end_position_big_enough: start_pos <= end_pos + 1 end_pos_small_enough: end_pos <= a_string.count feature -- Duplication copy (other: NATIVE_STRING) -- 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: NATIVE_STRING) -- 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: NATIVE_STRING -- 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: NATIVE_STRING) -- 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: NATIVE_STRING -- 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: NATIVE_STRING -- 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 NATIVE_STRING -- 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 -- 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 feature -- Status Report is_empty: BOOLEAN -- Is current empty? invariant little_endian_windows: {PLATFORM}.is_windows implies Platform.Is_little_endian even_count_on_windows: {PLATFORM}.is_windows implies managed_data.count \\ unit_size = 0 -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) note copyright: "Copyright (c) 1984-2020, 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 NATIVE_STRING
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